Merge pull request #64787 from akien-mga/libwebp-1.2.4

libwebp: Sync with upstream 1.2.4

34 files changed, 1065 insertions, 1547 deletions

diff --git a/thirdparty/libwebp/src/dec/vp8i_dec.h b/thirdparty/libwebp/src/dec/vp8i_dec.h
index 9af22f8cc6..30c1bd3ef9 100644
--- a/thirdparty/libwebp/src/dec/vp8i_dec.h
+++ b/thirdparty/libwebp/src/dec/vp8i_dec.h
@@ -32,7 +32,7 @@ extern "C" {
 // version numbers
 #define DEC_MAJ_VERSION 1
 #define DEC_MIN_VERSION 2
-#define DEC_REV_VERSION 2
+#define DEC_REV_VERSION 4
 
 // YUV-cache parameters. Cache is 32-bytes wide (= one cacheline).
 // Constraints are: We need to store one 16x16 block of luma samples (y),
diff --git a/thirdparty/libwebp/src/dec/vp8l_dec.c b/thirdparty/libwebp/src/dec/vp8l_dec.c
index 78db014030..1348055128 100644
--- a/thirdparty/libwebp/src/dec/vp8l_dec.c
+++ b/thirdparty/libwebp/src/dec/vp8l_dec.c
@@ -178,7 +178,7 @@ static WEBP_INLINE int PlaneCodeToDistance(int xsize, int plane_code) {
 
 //------------------------------------------------------------------------------
 // Decodes the next Huffman code from bit-stream.
-// FillBitWindow(br) needs to be called at minimum every second call
+// VP8LFillBitWindow(br) needs to be called at minimum every second call
 // to ReadSymbol, in order to pre-fetch enough bits.
 static WEBP_INLINE int ReadSymbol(const HuffmanCode* table,
                                   VP8LBitReader* const br) {
@@ -321,7 +321,7 @@ static int ReadHuffmanCode(int alphabet_size, VP8LDecoder* const dec,
     // The first code is either 1 bit or 8 bit code.
     int symbol = VP8LReadBits(br, (first_symbol_len_code == 0) ? 1 : 8);
     code_lengths[symbol] = 1;
-    // The second code (if present), is always 8 bit long.
+    // The second code (if present), is always 8 bits long.
     if (num_symbols == 2) {
       symbol = VP8LReadBits(br, 8);
       code_lengths[symbol] = 1;
@@ -1281,7 +1281,7 @@ static int ExpandColorMap(int num_colors, VP8LTransform* const transform) {
     uint8_t* const new_data = (uint8_t*)new_color_map;
     new_color_map[0] = transform->data_[0];
     for (i = 4; i < 4 * num_colors; ++i) {
-      // Equivalent to AddPixelEq(), on a byte-basis.
+      // Equivalent to VP8LAddPixels(), on a byte-basis.
       new_data[i] = (data[i] + new_data[i - 4]) & 0xff;
     }
     for (; i < 4 * final_num_colors; ++i) {
diff --git a/thirdparty/libwebp/src/demux/demux.c b/thirdparty/libwebp/src/demux/demux.c
index f04a2b8450..41387ec2d6 100644
--- a/thirdparty/libwebp/src/demux/demux.c
+++ b/thirdparty/libwebp/src/demux/demux.c
@@ -25,7 +25,7 @@
 
 #define DMUX_MAJ_VERSION 1
 #define DMUX_MIN_VERSION 2
-#define DMUX_REV_VERSION 2
+#define DMUX_REV_VERSION 4
 
 typedef struct {
   size_t start_;        // start location of the data
@@ -614,7 +614,6 @@ static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
 
   while (f != NULL) {
     const int cur_frame_set = f->frame_num_;
-    int frame_count = 0;
 
     // Check frame properties.
     for (; f != NULL && f->frame_num_ == cur_frame_set; f = f->next_) {
@@ -649,8 +648,6 @@ static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
                             dmux->canvas_width_, dmux->canvas_height_)) {
         return 0;
       }
-
-      ++frame_count;
     }
   }
   return 1;
diff --git a/thirdparty/libwebp/src/dsp/alpha_processing_neon.c b/thirdparty/libwebp/src/dsp/alpha_processing_neon.c
index 9e0ace9421..6716fb77f0 100644
--- a/thirdparty/libwebp/src/dsp/alpha_processing_neon.c
+++ b/thirdparty/libwebp/src/dsp/alpha_processing_neon.c
@@ -83,7 +83,7 @@ static void ApplyAlphaMultiply_NEON(uint8_t* rgba, int alpha_first,
 static int DispatchAlpha_NEON(const uint8_t* WEBP_RESTRICT alpha,
                               int alpha_stride, int width, int height,
                               uint8_t* WEBP_RESTRICT dst, int dst_stride) {
-  uint32_t alpha_mask = 0xffffffffu;
+  uint32_t alpha_mask = 0xffu;
   uint8x8_t mask8 = vdup_n_u8(0xff);
   uint32_t tmp[2];
   int i, j;
@@ -107,6 +107,7 @@ static int DispatchAlpha_NEON(const uint8_t* WEBP_RESTRICT alpha,
     dst += dst_stride;
   }
   vst1_u8((uint8_t*)tmp, mask8);
+  alpha_mask *= 0x01010101;
   alpha_mask &= tmp[0];
   alpha_mask &= tmp[1];
   return (alpha_mask != 0xffffffffu);
@@ -135,7 +136,7 @@ static void DispatchAlphaToGreen_NEON(const uint8_t* WEBP_RESTRICT alpha,
 static int ExtractAlpha_NEON(const uint8_t* WEBP_RESTRICT argb, int argb_stride,
                              int width, int height,
                              uint8_t* WEBP_RESTRICT alpha, int alpha_stride) {
-  uint32_t alpha_mask = 0xffffffffu;
+  uint32_t alpha_mask = 0xffu;
   uint8x8_t mask8 = vdup_n_u8(0xff);
   uint32_t tmp[2];
   int i, j;
@@ -157,6 +158,7 @@ static int ExtractAlpha_NEON(const uint8_t* WEBP_RESTRICT argb, int argb_stride,
     alpha += alpha_stride;
   }
   vst1_u8((uint8_t*)tmp, mask8);
+  alpha_mask *= 0x01010101;
   alpha_mask &= tmp[0];
   alpha_mask &= tmp[1];
   return (alpha_mask == 0xffffffffu);
diff --git a/thirdparty/libwebp/src/dsp/cpu.c b/thirdparty/libwebp/src/dsp/cpu.c
index 3145e190a4..a4ba7f2cb7 100644
--- a/thirdparty/libwebp/src/dsp/cpu.c
+++ b/thirdparty/libwebp/src/dsp/cpu.c
@@ -11,7 +11,7 @@
 //
 // Author: Christian Duvivier (cduvivier@google.com)
 
-#include "src/dsp/dsp.h"
+#include "src/dsp/cpu.h"
 
 #if defined(WEBP_HAVE_NEON_RTCD)
 #include <stdio.h>
diff --git a/thirdparty/libwebp/src/dsp/cpu.h b/thirdparty/libwebp/src/dsp/cpu.h
new file mode 100644
index 0000000000..57a40d87d4
--- /dev/null
+++ b/thirdparty/libwebp/src/dsp/cpu.h
@@ -0,0 +1,254 @@
+// Copyright 2022 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//   CPU detection functions and macros.
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#ifndef WEBP_DSP_CPU_H_
+#define WEBP_DSP_CPU_H_
+
+#ifdef HAVE_CONFIG_H
+#include "src/webp/config.h"
+#endif
+
+#include "src/webp/types.h"
+
+#if defined(__GNUC__)
+#define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
+#define LOCAL_GCC_PREREQ(maj, min) (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
+#else
+#define LOCAL_GCC_VERSION 0
+#define LOCAL_GCC_PREREQ(maj, min) 0
+#endif
+
+#if defined(__clang__)
+#define LOCAL_CLANG_VERSION ((__clang_major__ << 8) | __clang_minor__)
+#define LOCAL_CLANG_PREREQ(maj, min) \
+  (LOCAL_CLANG_VERSION >= (((maj) << 8) | (min)))
+#else
+#define LOCAL_CLANG_VERSION 0
+#define LOCAL_CLANG_PREREQ(maj, min) 0
+#endif
+
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+#if !defined(HAVE_CONFIG_H)
+#if defined(_MSC_VER) && _MSC_VER > 1310 && \
+    (defined(_M_X64) || defined(_M_IX86))
+#define WEBP_MSC_SSE2  // Visual C++ SSE2 targets
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER >= 1500 && \
+    (defined(_M_X64) || defined(_M_IX86))
+#define WEBP_MSC_SSE41  // Visual C++ SSE4.1 targets
+#endif
+#endif
+
+// WEBP_HAVE_* are used to indicate the presence of the instruction set in dsp
+// files without intrinsics, allowing the corresponding Init() to be called.
+// Files containing intrinsics will need to be built targeting the instruction
+// set so should succeed on one of the earlier tests.
+#if (defined(__SSE2__) || defined(WEBP_MSC_SSE2)) && \
+    (!defined(HAVE_CONFIG_H) || defined(WEBP_HAVE_SSE2))
+#define WEBP_USE_SSE2
+#endif
+
+#if defined(WEBP_USE_SSE2) && !defined(WEBP_HAVE_SSE2)
+#define WEBP_HAVE_SSE2
+#endif
+
+#if (defined(__SSE4_1__) || defined(WEBP_MSC_SSE41)) && \
+    (!defined(HAVE_CONFIG_H) || defined(WEBP_HAVE_SSE41))
+#define WEBP_USE_SSE41
+#endif
+
+#if defined(WEBP_USE_SSE41) && !defined(WEBP_HAVE_SSE41)
+#define WEBP_HAVE_SSE41
+#endif
+
+#undef WEBP_MSC_SSE41
+#undef WEBP_MSC_SSE2
+
+// The intrinsics currently cause compiler errors with arm-nacl-gcc and the
+// inline assembly would need to be modified for use with Native Client.
+#if ((defined(__ARM_NEON__) || defined(__aarch64__)) &&       \
+     (!defined(HAVE_CONFIG_H) || defined(WEBP_HAVE_NEON))) && \
+    !defined(__native_client__)
+#define WEBP_USE_NEON
+#endif
+
+#if !defined(WEBP_USE_NEON) && defined(__ANDROID__) && \
+    defined(__ARM_ARCH_7A__) && defined(HAVE_CPU_FEATURES_H)
+#define WEBP_ANDROID_NEON  // Android targets that may have NEON
+#define WEBP_USE_NEON
+#endif
+
+// Note: ARM64 is supported in Visual Studio 2017, but requires the direct
+// inclusion of arm64_neon.h; Visual Studio 2019 includes this file in
+// arm_neon.h. Compile errors were seen with Visual Studio 2019 16.4 with
+// vtbl4_u8(); a fix was made in 16.6.
+#if defined(_MSC_VER) && ((_MSC_VER >= 1700 && defined(_M_ARM)) || \
+                          (_MSC_VER >= 1926 && defined(_M_ARM64)))
+#define WEBP_USE_NEON
+#define WEBP_USE_INTRINSICS
+#endif
+
+#if defined(WEBP_USE_NEON) && !defined(WEBP_HAVE_NEON)
+#define WEBP_HAVE_NEON
+#endif
+
+#if defined(__mips__) && !defined(__mips64) && defined(__mips_isa_rev) && \
+    (__mips_isa_rev >= 1) && (__mips_isa_rev < 6)
+#define WEBP_USE_MIPS32
+#if (__mips_isa_rev >= 2)
+#define WEBP_USE_MIPS32_R2
+#if defined(__mips_dspr2) || (defined(__mips_dsp_rev) && __mips_dsp_rev >= 2)
+#define WEBP_USE_MIPS_DSP_R2
+#endif
+#endif
+#endif
+
+#if defined(__mips_msa) && defined(__mips_isa_rev) && (__mips_isa_rev >= 5)
+#define WEBP_USE_MSA
+#endif
+
+#ifndef WEBP_DSP_OMIT_C_CODE
+#define WEBP_DSP_OMIT_C_CODE 1
+#endif
+
+#if defined(WEBP_USE_NEON) && WEBP_DSP_OMIT_C_CODE
+#define WEBP_NEON_OMIT_C_CODE 1
+#else
+#define WEBP_NEON_OMIT_C_CODE 0
+#endif
+
+#if !(LOCAL_CLANG_PREREQ(3, 8) || LOCAL_GCC_PREREQ(4, 8) || \
+      defined(__aarch64__))
+#define WEBP_NEON_WORK_AROUND_GCC 1
+#else
+#define WEBP_NEON_WORK_AROUND_GCC 0
+#endif
+
+// This macro prevents thread_sanitizer from reporting known concurrent writes.
+#define WEBP_TSAN_IGNORE_FUNCTION
+#if defined(__has_feature)
+#if __has_feature(thread_sanitizer)
+#undef WEBP_TSAN_IGNORE_FUNCTION
+#define WEBP_TSAN_IGNORE_FUNCTION __attribute__((no_sanitize_thread))
+#endif
+#endif
+
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+#define WEBP_MSAN
+#endif
+#endif
+
+#if defined(WEBP_USE_THREAD) && !defined(_WIN32)
+#include <pthread.h>  // NOLINT
+
+#define WEBP_DSP_INIT(func)                                         \
+  do {                                                              \
+    static volatile VP8CPUInfo func##_last_cpuinfo_used =           \
+        (VP8CPUInfo)&func##_last_cpuinfo_used;                      \
+    static pthread_mutex_t func##_lock = PTHREAD_MUTEX_INITIALIZER; \
+    if (pthread_mutex_lock(&func##_lock)) break;                    \
+    if (func##_last_cpuinfo_used != VP8GetCPUInfo) func();          \
+    func##_last_cpuinfo_used = VP8GetCPUInfo;                       \
+    (void)pthread_mutex_unlock(&func##_lock);                       \
+  } while (0)
+#else  // !(defined(WEBP_USE_THREAD) && !defined(_WIN32))
+#define WEBP_DSP_INIT(func)                               \
+  do {                                                    \
+    static volatile VP8CPUInfo func##_last_cpuinfo_used = \
+        (VP8CPUInfo)&func##_last_cpuinfo_used;            \
+    if (func##_last_cpuinfo_used == VP8GetCPUInfo) break; \
+    func();                                               \
+    func##_last_cpuinfo_used = VP8GetCPUInfo;             \
+  } while (0)
+#endif  // defined(WEBP_USE_THREAD) && !defined(_WIN32)
+
+// Defines an Init + helper function that control multiple initialization of
+// function pointers / tables.
+/* Usage:
+   WEBP_DSP_INIT_FUNC(InitFunc) {
+     ...function body
+   }
+*/
+#define WEBP_DSP_INIT_FUNC(name)                                            \
+  static WEBP_TSAN_IGNORE_FUNCTION void name##_body(void);                  \
+  WEBP_TSAN_IGNORE_FUNCTION void name(void) { WEBP_DSP_INIT(name##_body); } \
+  static WEBP_TSAN_IGNORE_FUNCTION void name##_body(void)
+
+#define WEBP_UBSAN_IGNORE_UNDEF
+#define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW
+#if defined(__clang__) && defined(__has_attribute)
+#if __has_attribute(no_sanitize)
+// This macro prevents the undefined behavior sanitizer from reporting
+// failures. This is only meant to silence unaligned loads on platforms that
+// are known to support them.
+#undef WEBP_UBSAN_IGNORE_UNDEF
+#define WEBP_UBSAN_IGNORE_UNDEF __attribute__((no_sanitize("undefined")))
+
+// This macro prevents the undefined behavior sanitizer from reporting
+// failures related to unsigned integer overflows. This is only meant to
+// silence cases where this well defined behavior is expected.
+#undef WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW
+#define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW \
+  __attribute__((no_sanitize("unsigned-integer-overflow")))
+#endif
+#endif
+
+// If 'ptr' is NULL, returns NULL. Otherwise returns 'ptr + off'.
+// Prevents undefined behavior sanitizer nullptr-with-nonzero-offset warning.
+#if !defined(WEBP_OFFSET_PTR)
+#define WEBP_OFFSET_PTR(ptr, off) (((ptr) == NULL) ? NULL : ((ptr) + (off)))
+#endif
+
+// Regularize the definition of WEBP_SWAP_16BIT_CSP (backward compatibility)
+#if !defined(WEBP_SWAP_16BIT_CSP)
+#define WEBP_SWAP_16BIT_CSP 0
+#endif
+
+// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
+#if !defined(WORDS_BIGENDIAN) &&                   \
+    (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
+     (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
+#define WORDS_BIGENDIAN
+#endif
+
+typedef enum {
+  kSSE2,
+  kSSE3,
+  kSlowSSSE3,  // special feature for slow SSSE3 architectures
+  kSSE4_1,
+  kAVX,
+  kAVX2,
+  kNEON,
+  kMIPS32,
+  kMIPSdspR2,
+  kMSA
+} CPUFeature;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// returns true if the CPU supports the feature.
+typedef int (*VP8CPUInfo)(CPUFeature feature);
+WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
+
+#ifdef __cplusplus
+}    // extern "C"
+#endif
+
+#endif  // WEBP_DSP_CPU_H_
diff --git a/thirdparty/libwebp/src/dsp/dsp.h b/thirdparty/libwebp/src/dsp/dsp.h
index c4f57e4d5b..d2000b8efc 100644
--- a/thirdparty/libwebp/src/dsp/dsp.h
+++ b/thirdparty/libwebp/src/dsp/dsp.h
@@ -18,6 +18,7 @@
 #include "src/webp/config.h"
 #endif
 
+#include "src/dsp/cpu.h"
 #include "src/webp/types.h"
 
 #ifdef __cplusplus
@@ -43,225 +44,6 @@ extern "C" {
 #define WEBP_RESTRICT
 #endif
 
-//------------------------------------------------------------------------------
-// CPU detection
-
-#if defined(__GNUC__)
-# define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
-# define LOCAL_GCC_PREREQ(maj, min) \
-    (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
-#else
-# define LOCAL_GCC_VERSION 0
-# define LOCAL_GCC_PREREQ(maj, min) 0
-#endif
-
-#if defined(__clang__)
-# define LOCAL_CLANG_VERSION ((__clang_major__ << 8) | __clang_minor__)
-# define LOCAL_CLANG_PREREQ(maj, min) \
-    (LOCAL_CLANG_VERSION >= (((maj) << 8) | (min)))
-#else
-# define LOCAL_CLANG_VERSION 0
-# define LOCAL_CLANG_PREREQ(maj, min) 0
-#endif
-
-#ifndef __has_builtin
-# define __has_builtin(x) 0
-#endif
-
-#if !defined(HAVE_CONFIG_H)
-#if defined(_MSC_VER) && _MSC_VER > 1310 && \
-    (defined(_M_X64) || defined(_M_IX86))
-#define WEBP_MSC_SSE2  // Visual C++ SSE2 targets
-#endif
-
-#if defined(_MSC_VER) && _MSC_VER >= 1500 && \
-    (defined(_M_X64) || defined(_M_IX86))
-#define WEBP_MSC_SSE41  // Visual C++ SSE4.1 targets
-#endif
-#endif
-
-// WEBP_HAVE_* are used to indicate the presence of the instruction set in dsp
-// files without intrinsics, allowing the corresponding Init() to be called.
-// Files containing intrinsics will need to be built targeting the instruction
-// set so should succeed on one of the earlier tests.
-#if (defined(__SSE2__) || defined(WEBP_MSC_SSE2)) && \
-    (!defined(HAVE_CONFIG_H) || defined(WEBP_HAVE_SSE2))
-#define WEBP_USE_SSE2
-#endif
-
-#if defined(WEBP_USE_SSE2) && !defined(WEBP_HAVE_SSE2)
-#define WEBP_HAVE_SSE2
-#endif
-
-#if (defined(__SSE4_1__) || defined(WEBP_MSC_SSE41)) && \
-    (!defined(HAVE_CONFIG_H) || defined(WEBP_HAVE_SSE41))
-#define WEBP_USE_SSE41
-#endif
-
-#if defined(WEBP_USE_SSE41) && !defined(WEBP_HAVE_SSE41)
-#define WEBP_HAVE_SSE41
-#endif
-
-#undef WEBP_MSC_SSE41
-#undef WEBP_MSC_SSE2
-
-// The intrinsics currently cause compiler errors with arm-nacl-gcc and the
-// inline assembly would need to be modified for use with Native Client.
-#if ((defined(__ARM_NEON__) || defined(__aarch64__)) && \
-     (!defined(HAVE_CONFIG_H) || defined(WEBP_HAVE_NEON))) && \
-    !defined(__native_client__)
-#define WEBP_USE_NEON
-#endif
-
-#if !defined(WEBP_USE_NEON) && defined(__ANDROID__) && \
-    defined(__ARM_ARCH_7A__) && defined(HAVE_CPU_FEATURES_H)
-#define WEBP_ANDROID_NEON  // Android targets that may have NEON
-#define WEBP_USE_NEON
-#endif
-
-// Note: ARM64 is supported in Visual Studio 2017, but requires the direct
-// inclusion of arm64_neon.h; Visual Studio 2019 includes this file in
-// arm_neon.h.
-#if defined(_MSC_VER) && \
-  ((_MSC_VER >= 1700 && defined(_M_ARM)) || \
-   (_MSC_VER >= 1920 && defined(_M_ARM64)))
-#define WEBP_USE_NEON
-#define WEBP_USE_INTRINSICS
-#endif
-
-#if defined(WEBP_USE_NEON) && !defined(WEBP_HAVE_NEON)
-#define WEBP_HAVE_NEON
-#endif
-
-#if defined(__mips__) && !defined(__mips64) && \
-    defined(__mips_isa_rev) && (__mips_isa_rev >= 1) && (__mips_isa_rev < 6)
-#define WEBP_USE_MIPS32
-#if (__mips_isa_rev >= 2)
-#define WEBP_USE_MIPS32_R2
-#if defined(__mips_dspr2) || (defined(__mips_dsp_rev) && __mips_dsp_rev >= 2)
-#define WEBP_USE_MIPS_DSP_R2
-#endif
-#endif
-#endif
-
-#if defined(__mips_msa) && defined(__mips_isa_rev) && (__mips_isa_rev >= 5)
-#define WEBP_USE_MSA
-#endif
-
-#ifndef WEBP_DSP_OMIT_C_CODE
-#define WEBP_DSP_OMIT_C_CODE 1
-#endif
-
-#if defined(WEBP_USE_NEON) && WEBP_DSP_OMIT_C_CODE
-#define WEBP_NEON_OMIT_C_CODE 1
-#else
-#define WEBP_NEON_OMIT_C_CODE 0
-#endif
-
-#if !(LOCAL_CLANG_PREREQ(3,8) || LOCAL_GCC_PREREQ(4,8) || defined(__aarch64__))
-#define WEBP_NEON_WORK_AROUND_GCC 1
-#else
-#define WEBP_NEON_WORK_AROUND_GCC 0
-#endif
-
-// This macro prevents thread_sanitizer from reporting known concurrent writes.
-#define WEBP_TSAN_IGNORE_FUNCTION
-#if defined(__has_feature)
-#if __has_feature(thread_sanitizer)
-#undef WEBP_TSAN_IGNORE_FUNCTION
-#define WEBP_TSAN_IGNORE_FUNCTION __attribute__((no_sanitize_thread))
-#endif
-#endif
-
-#if defined(WEBP_USE_THREAD) && !defined(_WIN32)
-#include <pthread.h>  // NOLINT
-
-#define WEBP_DSP_INIT(func) do {                                    \
-  static volatile VP8CPUInfo func ## _last_cpuinfo_used =           \
-      (VP8CPUInfo)&func ## _last_cpuinfo_used;                      \
-  static pthread_mutex_t func ## _lock = PTHREAD_MUTEX_INITIALIZER; \
-  if (pthread_mutex_lock(&func ## _lock)) break;                    \
-  if (func ## _last_cpuinfo_used != VP8GetCPUInfo) func();          \
-  func ## _last_cpuinfo_used = VP8GetCPUInfo;                       \
-  (void)pthread_mutex_unlock(&func ## _lock);                       \
-} while (0)
-#else  // !(defined(WEBP_USE_THREAD) && !defined(_WIN32))
-#define WEBP_DSP_INIT(func) do {                                    \
-  static volatile VP8CPUInfo func ## _last_cpuinfo_used =           \
-      (VP8CPUInfo)&func ## _last_cpuinfo_used;                      \
-  if (func ## _last_cpuinfo_used == VP8GetCPUInfo) break;           \
-  func();                                                           \
-  func ## _last_cpuinfo_used = VP8GetCPUInfo;                       \
-} while (0)
-#endif  // defined(WEBP_USE_THREAD) && !defined(_WIN32)
-
-// Defines an Init + helper function that control multiple initialization of
-// function pointers / tables.
-/* Usage:
-   WEBP_DSP_INIT_FUNC(InitFunc) {
-     ...function body
-   }
-*/
-#define WEBP_DSP_INIT_FUNC(name)                             \
-  static WEBP_TSAN_IGNORE_FUNCTION void name ## _body(void); \
-  WEBP_TSAN_IGNORE_FUNCTION void name(void) {                \
-    WEBP_DSP_INIT(name ## _body);                            \
-  }                                                          \
-  static WEBP_TSAN_IGNORE_FUNCTION void name ## _body(void)
-
-#define WEBP_UBSAN_IGNORE_UNDEF
-#define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW
-#if defined(__clang__) && defined(__has_attribute)
-#if __has_attribute(no_sanitize)
-// This macro prevents the undefined behavior sanitizer from reporting
-// failures. This is only meant to silence unaligned loads on platforms that
-// are known to support them.
-#undef WEBP_UBSAN_IGNORE_UNDEF
-#define WEBP_UBSAN_IGNORE_UNDEF \
-  __attribute__((no_sanitize("undefined")))
-
-// This macro prevents the undefined behavior sanitizer from reporting
-// failures related to unsigned integer overflows. This is only meant to
-// silence cases where this well defined behavior is expected.
-#undef WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW
-#define WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW \
-  __attribute__((no_sanitize("unsigned-integer-overflow")))
-#endif
-#endif
-
-// If 'ptr' is NULL, returns NULL. Otherwise returns 'ptr + off'.
-// Prevents undefined behavior sanitizer nullptr-with-nonzero-offset warning.
-#if !defined(WEBP_OFFSET_PTR)
-#define WEBP_OFFSET_PTR(ptr, off) (((ptr) == NULL) ? NULL : ((ptr) + (off)))
-#endif
-
-// Regularize the definition of WEBP_SWAP_16BIT_CSP (backward compatibility)
-#if !defined(WEBP_SWAP_16BIT_CSP)
-#define WEBP_SWAP_16BIT_CSP 0
-#endif
-
-// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
-#if !defined(WORDS_BIGENDIAN) && \
-    (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
-     (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
-#define WORDS_BIGENDIAN
-#endif
-
-typedef enum {
-  kSSE2,
-  kSSE3,
-  kSlowSSSE3,  // special feature for slow SSSE3 architectures
-  kSSE4_1,
-  kAVX,
-  kAVX2,
-  kNEON,
-  kMIPS32,
-  kMIPSdspR2,
-  kMSA
-} CPUFeature;
-// returns true if the CPU supports the feature.
-typedef int (*VP8CPUInfo)(CPUFeature feature);
-WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
 
 //------------------------------------------------------------------------------
 // Init stub generator
@@ -550,15 +332,6 @@ extern void WebPConvertARGBToUV_C(const uint32_t* argb, uint8_t* u, uint8_t* v,
 extern void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,
                                     uint8_t* u, uint8_t* v, int width);
 
-// utilities for accurate RGB->YUV conversion
-extern uint64_t (*WebPSharpYUVUpdateY)(const uint16_t* src, const uint16_t* ref,
-                                       uint16_t* dst, int len);
-extern void (*WebPSharpYUVUpdateRGB)(const int16_t* src, const int16_t* ref,
-                                     int16_t* dst, int len);
-extern void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B,
-                                     int len,
-                                     const uint16_t* best_y, uint16_t* out);
-
 // Must be called before using the above.
 void WebPInitConvertARGBToYUV(void);
 
diff --git a/thirdparty/libwebp/src/dsp/lossless.h b/thirdparty/libwebp/src/dsp/lossless.h
index c26c6bca07..de60d95d0b 100644
--- a/thirdparty/libwebp/src/dsp/lossless.h
+++ b/thirdparty/libwebp/src/dsp/lossless.h
@@ -182,9 +182,9 @@ extern VP8LPredictorAddSubFunc VP8LPredictorsSub_C[16];
 // -----------------------------------------------------------------------------
 // Huffman-cost related functions.
 
-typedef double (*VP8LCostFunc)(const uint32_t* population, int length);
-typedef double (*VP8LCostCombinedFunc)(const uint32_t* X, const uint32_t* Y,
-                                       int length);
+typedef float (*VP8LCostFunc)(const uint32_t* population, int length);
+typedef float (*VP8LCostCombinedFunc)(const uint32_t* X, const uint32_t* Y,
+                                      int length);
 typedef float (*VP8LCombinedShannonEntropyFunc)(const int X[256],
                                                 const int Y[256]);
 
@@ -198,7 +198,7 @@ typedef struct {        // small struct to hold counters
 } VP8LStreaks;
 
 typedef struct {            // small struct to hold bit entropy results
-  double entropy;           // entropy
+  float entropy;            // entropy
   uint32_t sum;             // sum of the population
   int nonzeros;             // number of non-zero elements in the population
   uint32_t max_val;         // maximum value in the population
diff --git a/thirdparty/libwebp/src/dsp/lossless_enc.c b/thirdparty/libwebp/src/dsp/lossless_enc.c
index 1580631e38..de6c4ace5f 100644
--- a/thirdparty/libwebp/src/dsp/lossless_enc.c
+++ b/thirdparty/libwebp/src/dsp/lossless_enc.c
@@ -402,7 +402,7 @@ static float FastLog2Slow_C(uint32_t v) {
 // Compute the combined Shanon's entropy for distribution {X} and {X+Y}
 static float CombinedShannonEntropy_C(const int X[256], const int Y[256]) {
   int i;
-  double retval = 0.;
+  float retval = 0.f;
   int sumX = 0, sumXY = 0;
   for (i = 0; i < 256; ++i) {
     const int x = X[i];
@@ -418,7 +418,7 @@ static float CombinedShannonEntropy_C(const int X[256], const int Y[256]) {
     }
   }
   retval += VP8LFastSLog2(sumX) + VP8LFastSLog2(sumXY);
-  return (float)retval;
+  return retval;
 }
 
 void VP8LBitEntropyInit(VP8LBitEntropy* const entropy) {
@@ -636,17 +636,17 @@ void VP8LBundleColorMap_C(const uint8_t* const row, int width, int xbits,
 
 //------------------------------------------------------------------------------
 
-static double ExtraCost_C(const uint32_t* population, int length) {
+static float ExtraCost_C(const uint32_t* population, int length) {
   int i;
-  double cost = 0.;
+  float cost = 0.f;
   for (i = 2; i < length - 2; ++i) cost += (i >> 1) * population[i + 2];
   return cost;
 }
 
-static double ExtraCostCombined_C(const uint32_t* X, const uint32_t* Y,
+static float ExtraCostCombined_C(const uint32_t* X, const uint32_t* Y,
                                   int length) {
   int i;
-  double cost = 0.;
+  float cost = 0.f;
   for (i = 2; i < length - 2; ++i) {
     const int xy = X[i + 2] + Y[i + 2];
     cost += (i >> 1) * xy;
diff --git a/thirdparty/libwebp/src/dsp/lossless_enc_mips32.c b/thirdparty/libwebp/src/dsp/lossless_enc_mips32.c
index 0412a093cf..639f786631 100644
--- a/thirdparty/libwebp/src/dsp/lossless_enc_mips32.c
+++ b/thirdparty/libwebp/src/dsp/lossless_enc_mips32.c
@@ -103,8 +103,8 @@ static float FastLog2Slow_MIPS32(uint32_t v) {
 //     cost += i * *(pop + 1);
 //     pop += 2;
 //   }
-//   return (double)cost;
-static double ExtraCost_MIPS32(const uint32_t* const population, int length) {
+//   return (float)cost;
+static float ExtraCost_MIPS32(const uint32_t* const population, int length) {
   int i, temp0, temp1;
   const uint32_t* pop = &population[4];
   const uint32_t* const LoopEnd = &population[length];
@@ -130,7 +130,7 @@ static double ExtraCost_MIPS32(const uint32_t* const population, int length) {
     : "memory", "hi", "lo"
   );
 
-  return (double)((int64_t)temp0 << 32 | temp1);
+  return (float)((int64_t)temp0 << 32 | temp1);
 }
 
 // C version of this function:
@@ -148,9 +148,9 @@ static double ExtraCost_MIPS32(const uint32_t* const population, int length) {
 //     pX += 2;
 //     pY += 2;
 //   }
-//   return (double)cost;
-static double ExtraCostCombined_MIPS32(const uint32_t* const X,
-                                       const uint32_t* const Y, int length) {
+//   return (float)cost;
+static float ExtraCostCombined_MIPS32(const uint32_t* const X,
+                                      const uint32_t* const Y, int length) {
   int i, temp0, temp1, temp2, temp3;
   const uint32_t* pX = &X[4];
   const uint32_t* pY = &Y[4];
@@ -183,7 +183,7 @@ static double ExtraCostCombined_MIPS32(const uint32_t* const X,
     : "memory", "hi", "lo"
   );
 
-  return (double)((int64_t)temp0 << 32 | temp1);
+  return (float)((int64_t)temp0 << 32 | temp1);
 }
 
 #define HUFFMAN_COST_PASS                                 \
@@ -347,24 +347,24 @@ static void GetCombinedEntropyUnrefined_MIPS32(const uint32_t X[],
 static void AddVector_MIPS32(const uint32_t* pa, const uint32_t* pb,
                              uint32_t* pout, int size) {
   uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
-  const uint32_t end = ((size) / 4) * 4;
+  const int end = ((size) / 4) * 4;
   const uint32_t* const LoopEnd = pa + end;
   int i;
   ASM_START
   ADD_TO_OUT(0, 4, 8, 12, 1, pa, pb, pout)
   ASM_END_0
-  for (i = end; i < size; ++i) pout[i] = pa[i] + pb[i];
+  for (i = 0; i < size - end; ++i) pout[i] = pa[i] + pb[i];
 }
 
 static void AddVectorEq_MIPS32(const uint32_t* pa, uint32_t* pout, int size) {
   uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
-  const uint32_t end = ((size) / 4) * 4;
+  const int end = ((size) / 4) * 4;
   const uint32_t* const LoopEnd = pa + end;
   int i;
   ASM_START
   ADD_TO_OUT(0, 4, 8, 12, 0, pa, pout, pout)
   ASM_END_1
-  for (i = end; i < size; ++i) pout[i] += pa[i];
+  for (i = 0; i < size - end; ++i) pout[i] += pa[i];
 }
 
 #undef ASM_END_1
diff --git a/thirdparty/libwebp/src/dsp/lossless_enc_sse2.c b/thirdparty/libwebp/src/dsp/lossless_enc_sse2.c
index b2f83b871c..948001a3d5 100644
--- a/thirdparty/libwebp/src/dsp/lossless_enc_sse2.c
+++ b/thirdparty/libwebp/src/dsp/lossless_enc_sse2.c
@@ -239,7 +239,7 @@ static void AddVectorEq_SSE2(const uint32_t* a, uint32_t* out, int size) {
 
 static float CombinedShannonEntropy_SSE2(const int X[256], const int Y[256]) {
   int i;
-  double retval = 0.;
+  float retval = 0.f;
   int sumX = 0, sumXY = 0;
   const __m128i zero = _mm_setzero_si128();
 
@@ -273,7 +273,7 @@ static float CombinedShannonEntropy_SSE2(const int X[256], const int Y[256]) {
     }
   }
   retval += VP8LFastSLog2(sumX) + VP8LFastSLog2(sumXY);
-  return (float)retval;
+  return retval;
 }
 
 #else
diff --git a/thirdparty/libwebp/src/dsp/yuv.c b/thirdparty/libwebp/src/dsp/yuv.c
index 48466f8b11..d16c13d3ca 100644
--- a/thirdparty/libwebp/src/dsp/yuv.c
+++ b/thirdparty/libwebp/src/dsp/yuv.c
@@ -194,50 +194,6 @@ void WebPConvertRGBA32ToUV_C(const uint16_t* rgb,
 
 //-----------------------------------------------------------------------------
 
-#if !WEBP_NEON_OMIT_C_CODE
-#define MAX_Y ((1 << 10) - 1)    // 10b precision over 16b-arithmetic
-static uint16_t clip_y(int v) {
-  return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
-}
-
-static uint64_t SharpYUVUpdateY_C(const uint16_t* ref, const uint16_t* src,
-                                  uint16_t* dst, int len) {
-  uint64_t diff = 0;
-  int i;
-  for (i = 0; i < len; ++i) {
-    const int diff_y = ref[i] - src[i];
-    const int new_y = (int)dst[i] + diff_y;
-    dst[i] = clip_y(new_y);
-    diff += (uint64_t)abs(diff_y);
-  }
-  return diff;
-}
-
-static void SharpYUVUpdateRGB_C(const int16_t* ref, const int16_t* src,
-                                int16_t* dst, int len) {
-  int i;
-  for (i = 0; i < len; ++i) {
-    const int diff_uv = ref[i] - src[i];
-    dst[i] += diff_uv;
-  }
-}
-
-static void SharpYUVFilterRow_C(const int16_t* A, const int16_t* B, int len,
-                                const uint16_t* best_y, uint16_t* out) {
-  int i;
-  for (i = 0; i < len; ++i, ++A, ++B) {
-    const int v0 = (A[0] * 9 + A[1] * 3 + B[0] * 3 + B[1] + 8) >> 4;
-    const int v1 = (A[1] * 9 + A[0] * 3 + B[1] * 3 + B[0] + 8) >> 4;
-    out[2 * i + 0] = clip_y(best_y[2 * i + 0] + v0);
-    out[2 * i + 1] = clip_y(best_y[2 * i + 1] + v1);
-  }
-}
-#endif  // !WEBP_NEON_OMIT_C_CODE
-
-#undef MAX_Y
-
-//-----------------------------------------------------------------------------
-
 void (*WebPConvertRGB24ToY)(const uint8_t* rgb, uint8_t* y, int width);
 void (*WebPConvertBGR24ToY)(const uint8_t* bgr, uint8_t* y, int width);
 void (*WebPConvertRGBA32ToUV)(const uint16_t* rgb,
@@ -247,18 +203,9 @@ void (*WebPConvertARGBToY)(const uint32_t* argb, uint8_t* y, int width);
 void (*WebPConvertARGBToUV)(const uint32_t* argb, uint8_t* u, uint8_t* v,
                             int src_width, int do_store);
 
-uint64_t (*WebPSharpYUVUpdateY)(const uint16_t* ref, const uint16_t* src,
-                                uint16_t* dst, int len);
-void (*WebPSharpYUVUpdateRGB)(const int16_t* ref, const int16_t* src,
-                              int16_t* dst, int len);
-void (*WebPSharpYUVFilterRow)(const int16_t* A, const int16_t* B, int len,
-                              const uint16_t* best_y, uint16_t* out);
-
 extern void WebPInitConvertARGBToYUVSSE2(void);
 extern void WebPInitConvertARGBToYUVSSE41(void);
 extern void WebPInitConvertARGBToYUVNEON(void);
-extern void WebPInitSharpYUVSSE2(void);
-extern void WebPInitSharpYUVNEON(void);
 
 WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {
   WebPConvertARGBToY = ConvertARGBToY_C;
@@ -269,17 +216,10 @@ WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {
 
   WebPConvertRGBA32ToUV = WebPConvertRGBA32ToUV_C;
 
-#if !WEBP_NEON_OMIT_C_CODE
-  WebPSharpYUVUpdateY = SharpYUVUpdateY_C;
-  WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_C;
-  WebPSharpYUVFilterRow = SharpYUVFilterRow_C;
-#endif
-
   if (VP8GetCPUInfo != NULL) {
 #if defined(WEBP_HAVE_SSE2)
     if (VP8GetCPUInfo(kSSE2)) {
       WebPInitConvertARGBToYUVSSE2();
-      WebPInitSharpYUVSSE2();
     }
 #endif  // WEBP_HAVE_SSE2
 #if defined(WEBP_HAVE_SSE41)
@@ -293,7 +233,6 @@ WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {
   if (WEBP_NEON_OMIT_C_CODE ||
       (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {
     WebPInitConvertARGBToYUVNEON();
-    WebPInitSharpYUVNEON();
   }
 #endif  // WEBP_HAVE_NEON
 
@@ -302,7 +241,4 @@ WEBP_DSP_INIT_FUNC(WebPInitConvertARGBToYUV) {
   assert(WebPConvertRGB24ToY != NULL);
   assert(WebPConvertBGR24ToY != NULL);
   assert(WebPConvertRGBA32ToUV != NULL);
-  assert(WebPSharpYUVUpdateY != NULL);
-  assert(WebPSharpYUVUpdateRGB != NULL);
-  assert(WebPSharpYUVFilterRow != NULL);
 }
diff --git a/thirdparty/libwebp/src/dsp/yuv_neon.c b/thirdparty/libwebp/src/dsp/yuv_neon.c
index a34d60248f..ff77b00980 100644
--- a/thirdparty/libwebp/src/dsp/yuv_neon.c
+++ b/thirdparty/libwebp/src/dsp/yuv_neon.c
@@ -173,116 +173,8 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVNEON(void) {
   WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_NEON;
 }
 
-//------------------------------------------------------------------------------
-
-#define MAX_Y ((1 << 10) - 1)    // 10b precision over 16b-arithmetic
-static uint16_t clip_y_NEON(int v) {
-  return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
-}
-
-static uint64_t SharpYUVUpdateY_NEON(const uint16_t* ref, const uint16_t* src,
-                                     uint16_t* dst, int len) {
-  int i;
-  const int16x8_t zero = vdupq_n_s16(0);
-  const int16x8_t max = vdupq_n_s16(MAX_Y);
-  uint64x2_t sum = vdupq_n_u64(0);
-  uint64_t diff;
-
-  for (i = 0; i + 8 <= len; i += 8) {
-    const int16x8_t A = vreinterpretq_s16_u16(vld1q_u16(ref + i));
-    const int16x8_t B = vreinterpretq_s16_u16(vld1q_u16(src + i));
-    const int16x8_t C = vreinterpretq_s16_u16(vld1q_u16(dst + i));
-    const int16x8_t D = vsubq_s16(A, B);       // diff_y
-    const int16x8_t F = vaddq_s16(C, D);       // new_y
-    const uint16x8_t H =
-        vreinterpretq_u16_s16(vmaxq_s16(vminq_s16(F, max), zero));
-    const int16x8_t I = vabsq_s16(D);          // abs(diff_y)
-    vst1q_u16(dst + i, H);
-    sum = vpadalq_u32(sum, vpaddlq_u16(vreinterpretq_u16_s16(I)));
-  }
-  diff = vgetq_lane_u64(sum, 0) + vgetq_lane_u64(sum, 1);
-  for (; i < len; ++i) {
-    const int diff_y = ref[i] - src[i];
-    const int new_y = (int)(dst[i]) + diff_y;
-    dst[i] = clip_y_NEON(new_y);
-    diff += (uint64_t)(abs(diff_y));
-  }
-  return diff;
-}
-
-static void SharpYUVUpdateRGB_NEON(const int16_t* ref, const int16_t* src,
-                                   int16_t* dst, int len) {
-  int i;
-  for (i = 0; i + 8 <= len; i += 8) {
-    const int16x8_t A = vld1q_s16(ref + i);
-    const int16x8_t B = vld1q_s16(src + i);
-    const int16x8_t C = vld1q_s16(dst + i);
-    const int16x8_t D = vsubq_s16(A, B);   // diff_uv
-    const int16x8_t E = vaddq_s16(C, D);   // new_uv
-    vst1q_s16(dst + i, E);
-  }
-  for (; i < len; ++i) {
-    const int diff_uv = ref[i] - src[i];
-    dst[i] += diff_uv;
-  }
-}
-
-static void SharpYUVFilterRow_NEON(const int16_t* A, const int16_t* B, int len,
-                                   const uint16_t* best_y, uint16_t* out) {
-  int i;
-  const int16x8_t max = vdupq_n_s16(MAX_Y);
-  const int16x8_t zero = vdupq_n_s16(0);
-  for (i = 0; i + 8 <= len; i += 8) {
-    const int16x8_t a0 = vld1q_s16(A + i + 0);
-    const int16x8_t a1 = vld1q_s16(A + i + 1);
-    const int16x8_t b0 = vld1q_s16(B + i + 0);
-    const int16x8_t b1 = vld1q_s16(B + i + 1);
-    const int16x8_t a0b1 = vaddq_s16(a0, b1);
-    const int16x8_t a1b0 = vaddq_s16(a1, b0);
-    const int16x8_t a0a1b0b1 = vaddq_s16(a0b1, a1b0);  // A0+A1+B0+B1
-    const int16x8_t a0b1_2 = vaddq_s16(a0b1, a0b1);    // 2*(A0+B1)
-    const int16x8_t a1b0_2 = vaddq_s16(a1b0, a1b0);    // 2*(A1+B0)
-    const int16x8_t c0 = vshrq_n_s16(vaddq_s16(a0b1_2, a0a1b0b1), 3);
-    const int16x8_t c1 = vshrq_n_s16(vaddq_s16(a1b0_2, a0a1b0b1), 3);
-    const int16x8_t d0 = vaddq_s16(c1, a0);
-    const int16x8_t d1 = vaddq_s16(c0, a1);
-    const int16x8_t e0 = vrshrq_n_s16(d0, 1);
-    const int16x8_t e1 = vrshrq_n_s16(d1, 1);
-    const int16x8x2_t f = vzipq_s16(e0, e1);
-    const int16x8_t g0 = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i + 0));
-    const int16x8_t g1 = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i + 8));
-    const int16x8_t h0 = vaddq_s16(g0, f.val[0]);
-    const int16x8_t h1 = vaddq_s16(g1, f.val[1]);
-    const int16x8_t i0 = vmaxq_s16(vminq_s16(h0, max), zero);
-    const int16x8_t i1 = vmaxq_s16(vminq_s16(h1, max), zero);
-    vst1q_u16(out + 2 * i + 0, vreinterpretq_u16_s16(i0));
-    vst1q_u16(out + 2 * i + 8, vreinterpretq_u16_s16(i1));
-  }
-  for (; i < len; ++i) {
-    const int a0b1 = A[i + 0] + B[i + 1];
-    const int a1b0 = A[i + 1] + B[i + 0];
-    const int a0a1b0b1 = a0b1 + a1b0 + 8;
-    const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;
-    const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;
-    out[2 * i + 0] = clip_y_NEON(best_y[2 * i + 0] + v0);
-    out[2 * i + 1] = clip_y_NEON(best_y[2 * i + 1] + v1);
-  }
-}
-#undef MAX_Y
-
-//------------------------------------------------------------------------------
-
-extern void WebPInitSharpYUVNEON(void);
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitSharpYUVNEON(void) {
-  WebPSharpYUVUpdateY = SharpYUVUpdateY_NEON;
-  WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_NEON;
-  WebPSharpYUVFilterRow = SharpYUVFilterRow_NEON;
-}
-
 #else  // !WEBP_USE_NEON
 
 WEBP_DSP_INIT_STUB(WebPInitConvertARGBToYUVNEON)
-WEBP_DSP_INIT_STUB(WebPInitSharpYUVNEON)
 
 #endif  // WEBP_USE_NEON
diff --git a/thirdparty/libwebp/src/dsp/yuv_sse2.c b/thirdparty/libwebp/src/dsp/yuv_sse2.c
index baa48d5371..970bbb7884 100644
--- a/thirdparty/libwebp/src/dsp/yuv_sse2.c
+++ b/thirdparty/libwebp/src/dsp/yuv_sse2.c
@@ -747,128 +747,9 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVSSE2(void) {
   WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_SSE2;
 }
 
-//------------------------------------------------------------------------------
-
-#define MAX_Y ((1 << 10) - 1)    // 10b precision over 16b-arithmetic
-static uint16_t clip_y(int v) {
-  return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v;
-}
-
-static uint64_t SharpYUVUpdateY_SSE2(const uint16_t* ref, const uint16_t* src,
-                                     uint16_t* dst, int len) {
-  uint64_t diff = 0;
-  uint32_t tmp[4];
-  int i;
-  const __m128i zero = _mm_setzero_si128();
-  const __m128i max = _mm_set1_epi16(MAX_Y);
-  const __m128i one = _mm_set1_epi16(1);
-  __m128i sum = zero;
-
-  for (i = 0; i + 8 <= len; i += 8) {
-    const __m128i A = _mm_loadu_si128((const __m128i*)(ref + i));
-    const __m128i B = _mm_loadu_si128((const __m128i*)(src + i));
-    const __m128i C = _mm_loadu_si128((const __m128i*)(dst + i));
-    const __m128i D = _mm_sub_epi16(A, B);       // diff_y
-    const __m128i E = _mm_cmpgt_epi16(zero, D);  // sign (-1 or 0)
-    const __m128i F = _mm_add_epi16(C, D);       // new_y
-    const __m128i G = _mm_or_si128(E, one);      // -1 or 1
-    const __m128i H = _mm_max_epi16(_mm_min_epi16(F, max), zero);
-    const __m128i I = _mm_madd_epi16(D, G);      // sum(abs(...))
-    _mm_storeu_si128((__m128i*)(dst + i), H);
-    sum = _mm_add_epi32(sum, I);
-  }
-  _mm_storeu_si128((__m128i*)tmp, sum);
-  diff = tmp[3] + tmp[2] + tmp[1] + tmp[0];
-  for (; i < len; ++i) {
-    const int diff_y = ref[i] - src[i];
-    const int new_y = (int)dst[i] + diff_y;
-    dst[i] = clip_y(new_y);
-    diff += (uint64_t)abs(diff_y);
-  }
-  return diff;
-}
-
-static void SharpYUVUpdateRGB_SSE2(const int16_t* ref, const int16_t* src,
-                                   int16_t* dst, int len) {
-  int i = 0;
-  for (i = 0; i + 8 <= len; i += 8) {
-    const __m128i A = _mm_loadu_si128((const __m128i*)(ref + i));
-    const __m128i B = _mm_loadu_si128((const __m128i*)(src + i));
-    const __m128i C = _mm_loadu_si128((const __m128i*)(dst + i));
-    const __m128i D = _mm_sub_epi16(A, B);   // diff_uv
-    const __m128i E = _mm_add_epi16(C, D);   // new_uv
-    _mm_storeu_si128((__m128i*)(dst + i), E);
-  }
-  for (; i < len; ++i) {
-    const int diff_uv = ref[i] - src[i];
-    dst[i] += diff_uv;
-  }
-}
-
-static void SharpYUVFilterRow_SSE2(const int16_t* A, const int16_t* B, int len,
-                                   const uint16_t* best_y, uint16_t* out) {
-  int i;
-  const __m128i kCst8 = _mm_set1_epi16(8);
-  const __m128i max = _mm_set1_epi16(MAX_Y);
-  const __m128i zero = _mm_setzero_si128();
-  for (i = 0; i + 8 <= len; i += 8) {
-    const __m128i a0 = _mm_loadu_si128((const __m128i*)(A + i + 0));
-    const __m128i a1 = _mm_loadu_si128((const __m128i*)(A + i + 1));
-    const __m128i b0 = _mm_loadu_si128((const __m128i*)(B + i + 0));
-    const __m128i b1 = _mm_loadu_si128((const __m128i*)(B + i + 1));
-    const __m128i a0b1 = _mm_add_epi16(a0, b1);
-    const __m128i a1b0 = _mm_add_epi16(a1, b0);
-    const __m128i a0a1b0b1 = _mm_add_epi16(a0b1, a1b0);  // A0+A1+B0+B1
-    const __m128i a0a1b0b1_8 = _mm_add_epi16(a0a1b0b1, kCst8);
-    const __m128i a0b1_2 = _mm_add_epi16(a0b1, a0b1);    // 2*(A0+B1)
-    const __m128i a1b0_2 = _mm_add_epi16(a1b0, a1b0);    // 2*(A1+B0)
-    const __m128i c0 = _mm_srai_epi16(_mm_add_epi16(a0b1_2, a0a1b0b1_8), 3);
-    const __m128i c1 = _mm_srai_epi16(_mm_add_epi16(a1b0_2, a0a1b0b1_8), 3);
-    const __m128i d0 = _mm_add_epi16(c1, a0);
-    const __m128i d1 = _mm_add_epi16(c0, a1);
-    const __m128i e0 = _mm_srai_epi16(d0, 1);
-    const __m128i e1 = _mm_srai_epi16(d1, 1);
-    const __m128i f0 = _mm_unpacklo_epi16(e0, e1);
-    const __m128i f1 = _mm_unpackhi_epi16(e0, e1);
-    const __m128i g0 = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 0));
-    const __m128i g1 = _mm_loadu_si128((const __m128i*)(best_y + 2 * i + 8));
-    const __m128i h0 = _mm_add_epi16(g0, f0);
-    const __m128i h1 = _mm_add_epi16(g1, f1);
-    const __m128i i0 = _mm_max_epi16(_mm_min_epi16(h0, max), zero);
-    const __m128i i1 = _mm_max_epi16(_mm_min_epi16(h1, max), zero);
-    _mm_storeu_si128((__m128i*)(out + 2 * i + 0), i0);
-    _mm_storeu_si128((__m128i*)(out + 2 * i + 8), i1);
-  }
-  for (; i < len; ++i) {
-    //   (9 * A0 + 3 * A1 + 3 * B0 + B1 + 8) >> 4 =
-    // = (8 * A0 + 2 * (A1 + B0) + (A0 + A1 + B0 + B1 + 8)) >> 4
-    // We reuse the common sub-expressions.
-    const int a0b1 = A[i + 0] + B[i + 1];
-    const int a1b0 = A[i + 1] + B[i + 0];
-    const int a0a1b0b1 = a0b1 + a1b0 + 8;
-    const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4;
-    const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4;
-    out[2 * i + 0] = clip_y(best_y[2 * i + 0] + v0);
-    out[2 * i + 1] = clip_y(best_y[2 * i + 1] + v1);
-  }
-}
-
-#undef MAX_Y
-
-//------------------------------------------------------------------------------
-
-extern void WebPInitSharpYUVSSE2(void);
-
-WEBP_TSAN_IGNORE_FUNCTION void WebPInitSharpYUVSSE2(void) {
-  WebPSharpYUVUpdateY = SharpYUVUpdateY_SSE2;
-  WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_SSE2;
-  WebPSharpYUVFilterRow = SharpYUVFilterRow_SSE2;
-}
-
 #else  // !WEBP_USE_SSE2
 
 WEBP_DSP_INIT_STUB(WebPInitSamplersSSE2)
 WEBP_DSP_INIT_STUB(WebPInitConvertARGBToYUVSSE2)
-WEBP_DSP_INIT_STUB(WebPInitSharpYUVSSE2)
 
 #endif  // WEBP_USE_SSE2
diff --git a/thirdparty/libwebp/src/enc/alpha_enc.c b/thirdparty/libwebp/src/enc/alpha_enc.c
index 0b54f3e6ec..f7c02690e3 100644
--- a/thirdparty/libwebp/src/enc/alpha_enc.c
+++ b/thirdparty/libwebp/src/enc/alpha_enc.c
@@ -86,7 +86,7 @@ static int EncodeLossless(const uint8_t* const data, int width, int height,
   // a decoder bug related to alpha with color cache.
   // See: https://code.google.com/p/webp/issues/detail?id=239
   // Need to re-enable this later.
-  ok = (VP8LEncodeStream(&config, &picture, bw, 0 /*use_cache*/) == VP8_ENC_OK);
+  ok = VP8LEncodeStream(&config, &picture, bw, /*use_cache=*/0);
   WebPPictureFree(&picture);
   ok = ok && !bw->error_;
   if (!ok) {
diff --git a/thirdparty/libwebp/src/enc/backward_references_cost_enc.c b/thirdparty/libwebp/src/enc/backward_references_cost_enc.c
index 516abd73eb..6968ef3c9f 100644
--- a/thirdparty/libwebp/src/enc/backward_references_cost_enc.c
+++ b/thirdparty/libwebp/src/enc/backward_references_cost_enc.c
@@ -15,10 +15,11 @@
 //
 
 #include <assert.h>
+#include <float.h>
 
+#include "src/dsp/lossless_common.h"
 #include "src/enc/backward_references_enc.h"
 #include "src/enc/histogram_enc.h"
-#include "src/dsp/lossless_common.h"
 #include "src/utils/color_cache_utils.h"
 #include "src/utils/utils.h"
 
@@ -30,15 +31,15 @@ extern void VP8LBackwardRefsCursorAdd(VP8LBackwardRefs* const refs,
                                       const PixOrCopy v);
 
 typedef struct {
-  double alpha_[VALUES_IN_BYTE];
-  double red_[VALUES_IN_BYTE];
-  double blue_[VALUES_IN_BYTE];
-  double distance_[NUM_DISTANCE_CODES];
-  double* literal_;
+  float alpha_[VALUES_IN_BYTE];
+  float red_[VALUES_IN_BYTE];
+  float blue_[VALUES_IN_BYTE];
+  float distance_[NUM_DISTANCE_CODES];
+  float* literal_;
 } CostModel;
 
 static void ConvertPopulationCountTableToBitEstimates(
-    int num_symbols, const uint32_t population_counts[], double output[]) {
+    int num_symbols, const uint32_t population_counts[], float output[]) {
   uint32_t sum = 0;
   int nonzeros = 0;
   int i;
@@ -51,7 +52,7 @@ static void ConvertPopulationCountTableToBitEstimates(
   if (nonzeros <= 1) {
     memset(output, 0, num_symbols * sizeof(*output));
   } else {
-    const double logsum = VP8LFastLog2(sum);
+    const float logsum = VP8LFastLog2(sum);
     for (i = 0; i < num_symbols; ++i) {
       output[i] = logsum - VP8LFastLog2(population_counts[i]);
     }
@@ -75,8 +76,8 @@ static int CostModelBuild(CostModel* const m, int xsize, int cache_bits,
   }
 
   ConvertPopulationCountTableToBitEstimates(
-      VP8LHistogramNumCodes(histo->palette_code_bits_),
-      histo->literal_, m->literal_);
+      VP8LHistogramNumCodes(histo->palette_code_bits_), histo->literal_,
+      m->literal_);
   ConvertPopulationCountTableToBitEstimates(
       VALUES_IN_BYTE, histo->red_, m->red_);
   ConvertPopulationCountTableToBitEstimates(
@@ -92,27 +93,27 @@ static int CostModelBuild(CostModel* const m, int xsize, int cache_bits,
   return ok;
 }
 
-static WEBP_INLINE double GetLiteralCost(const CostModel* const m, uint32_t v) {
+static WEBP_INLINE float GetLiteralCost(const CostModel* const m, uint32_t v) {
   return m->alpha_[v >> 24] +
          m->red_[(v >> 16) & 0xff] +
          m->literal_[(v >> 8) & 0xff] +
          m->blue_[v & 0xff];
 }
 
-static WEBP_INLINE double GetCacheCost(const CostModel* const m, uint32_t idx) {
+static WEBP_INLINE float GetCacheCost(const CostModel* const m, uint32_t idx) {
   const int literal_idx = VALUES_IN_BYTE + NUM_LENGTH_CODES + idx;
   return m->literal_[literal_idx];
 }
 
-static WEBP_INLINE double GetLengthCost(const CostModel* const m,
-                                        uint32_t length) {
+static WEBP_INLINE float GetLengthCost(const CostModel* const m,
+                                       uint32_t length) {
   int code, extra_bits;
   VP8LPrefixEncodeBits(length, &code, &extra_bits);
   return m->literal_[VALUES_IN_BYTE + code] + extra_bits;
 }
 
-static WEBP_INLINE double GetDistanceCost(const CostModel* const m,
-                                          uint32_t distance) {
+static WEBP_INLINE float GetDistanceCost(const CostModel* const m,
+                                         uint32_t distance) {
   int code, extra_bits;
   VP8LPrefixEncodeBits(distance, &code, &extra_bits);
   return m->distance_[code] + extra_bits;
@@ -122,20 +123,20 @@ static WEBP_INLINE void AddSingleLiteralWithCostModel(
     const uint32_t* const argb, VP8LColorCache* const hashers,
     const CostModel* const cost_model, int idx, int use_color_cache,
     float prev_cost, float* const cost, uint16_t* const dist_array) {
-  double cost_val = prev_cost;
+  float cost_val = prev_cost;
   const uint32_t color = argb[idx];
   const int ix = use_color_cache ? VP8LColorCacheContains(hashers, color) : -1;
   if (ix >= 0) {
     // use_color_cache is true and hashers contains color
-    const double mul0 = 0.68;
+    const float mul0 = 0.68f;
     cost_val += GetCacheCost(cost_model, ix) * mul0;
   } else {
-    const double mul1 = 0.82;
+    const float mul1 = 0.82f;
     if (use_color_cache) VP8LColorCacheInsert(hashers, color);
     cost_val += GetLiteralCost(cost_model, color) * mul1;
   }
   if (cost[idx] > cost_val) {
-    cost[idx] = (float)cost_val;
+    cost[idx] = cost_val;
     dist_array[idx] = 1;  // only one is inserted.
   }
 }
@@ -172,7 +173,7 @@ struct CostInterval {
 
 // The GetLengthCost(cost_model, k) are cached in a CostCacheInterval.
 typedef struct {
-  double cost_;
+  float cost_;
   int start_;
   int end_;       // Exclusive.
 } CostCacheInterval;
@@ -187,7 +188,7 @@ typedef struct {
   int count_;  // The number of stored intervals.
   CostCacheInterval* cache_intervals_;
   size_t cache_intervals_size_;
-  double cost_cache_[MAX_LENGTH];  // Contains the GetLengthCost(cost_model, k).
+  float cost_cache_[MAX_LENGTH];  // Contains the GetLengthCost(cost_model, k).
   float* costs_;
   uint16_t* dist_array_;
   // Most of the time, we only need few intervals -> use a free-list, to avoid
@@ -262,10 +263,13 @@ static int CostManagerInit(CostManager* const manager,
   CostManagerInitFreeList(manager);
 
   // Fill in the cost_cache_.
+  // Has to be done in two passes due to a GCC bug on i686
+  // related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
+  for (i = 0; i < cost_cache_size; ++i) {
+    manager->cost_cache_[i] = GetLengthCost(cost_model, i);
+  }
   manager->cache_intervals_size_ = 1;
-  manager->cost_cache_[0] = GetLengthCost(cost_model, 0);
   for (i = 1; i < cost_cache_size; ++i) {
-    manager->cost_cache_[i] = GetLengthCost(cost_model, i);
     // Get the number of bound intervals.
     if (manager->cost_cache_[i] != manager->cost_cache_[i - 1]) {
       ++manager->cache_intervals_size_;
@@ -294,7 +298,7 @@ static int CostManagerInit(CostManager* const manager,
     cur->end_ = 1;
     cur->cost_ = manager->cost_cache_[0];
     for (i = 1; i < cost_cache_size; ++i) {
-      const double cost_val = manager->cost_cache_[i];
+      const float cost_val = manager->cost_cache_[i];
       if (cost_val != cur->cost_) {
         ++cur;
         // Initialize an interval.
@@ -303,6 +307,8 @@ static int CostManagerInit(CostManager* const manager,
       }
       cur->end_ = i + 1;
     }
+    assert((size_t)(cur - manager->cache_intervals_) + 1 ==
+           manager->cache_intervals_size_);
   }
 
   manager->costs_ = (float*)WebPSafeMalloc(pix_count, sizeof(*manager->costs_));
@@ -311,7 +317,7 @@ static int CostManagerInit(CostManager* const manager,
     return 0;
   }
   // Set the initial costs_ high for every pixel as we will keep the minimum.
-  for (i = 0; i < pix_count; ++i) manager->costs_[i] = 1e38f;
+  for (i = 0; i < pix_count; ++i) manager->costs_[i] = FLT_MAX;
 
   return 1;
 }
@@ -457,7 +463,7 @@ static WEBP_INLINE void InsertInterval(CostManager* const manager,
 // If handling the interval or one of its subintervals becomes to heavy, its
 // contribution is added to the costs right away.
 static WEBP_INLINE void PushInterval(CostManager* const manager,
-                                     double distance_cost, int position,
+                                     float distance_cost, int position,
                                      int len) {
   size_t i;
   CostInterval* interval = manager->head_;
@@ -474,7 +480,7 @@ static WEBP_INLINE void PushInterval(CostManager* const manager,
       const int k = j - position;
       float cost_tmp;
       assert(k >= 0 && k < MAX_LENGTH);
-      cost_tmp = (float)(distance_cost + manager->cost_cache_[k]);
+      cost_tmp = distance_cost + manager->cost_cache_[k];
 
       if (manager->costs_[j] > cost_tmp) {
         manager->costs_[j] = cost_tmp;
@@ -492,7 +498,7 @@ static WEBP_INLINE void PushInterval(CostManager* const manager,
     const int end = position + (cost_cache_intervals[i].end_ > len
                                  ? len
                                  : cost_cache_intervals[i].end_);
-    const float cost = (float)(distance_cost + cost_cache_intervals[i].cost_);
+    const float cost = distance_cost + cost_cache_intervals[i].cost_;
 
     for (; interval != NULL && interval->start_ < end;
          interval = interval_next) {
@@ -570,22 +576,21 @@ static int BackwardReferencesHashChainDistanceOnly(
   const int pix_count = xsize * ysize;
   const int use_color_cache = (cache_bits > 0);
   const size_t literal_array_size =
-      sizeof(double) * (NUM_LITERAL_CODES + NUM_LENGTH_CODES +
-                        ((cache_bits > 0) ? (1 << cache_bits) : 0));
+      sizeof(float) * (VP8LHistogramNumCodes(cache_bits));
   const size_t cost_model_size = sizeof(CostModel) + literal_array_size;
   CostModel* const cost_model =
       (CostModel*)WebPSafeCalloc(1ULL, cost_model_size);
   VP8LColorCache hashers;
   CostManager* cost_manager =
-      (CostManager*)WebPSafeMalloc(1ULL, sizeof(*cost_manager));
+      (CostManager*)WebPSafeCalloc(1ULL, sizeof(*cost_manager));
   int offset_prev = -1, len_prev = -1;
-  double offset_cost = -1;
+  float offset_cost = -1.f;
   int first_offset_is_constant = -1;  // initialized with 'impossible' value
   int reach = 0;
 
   if (cost_model == NULL || cost_manager == NULL) goto Error;
 
-  cost_model->literal_ = (double*)(cost_model + 1);
+  cost_model->literal_ = (float*)(cost_model + 1);
   if (use_color_cache) {
     cc_init = VP8LColorCacheInit(&hashers, cache_bits);
     if (!cc_init) goto Error;
@@ -675,7 +680,7 @@ static int BackwardReferencesHashChainDistanceOnly(
   }
 
   ok = !refs->error_;
-Error:
+ Error:
   if (cc_init) VP8LColorCacheClear(&hashers);
   CostManagerClear(cost_manager);
   WebPSafeFree(cost_model);
diff --git a/thirdparty/libwebp/src/enc/backward_references_enc.c b/thirdparty/libwebp/src/enc/backward_references_enc.c
index 519b36a091..49a0fac034 100644
--- a/thirdparty/libwebp/src/enc/backward_references_enc.c
+++ b/thirdparty/libwebp/src/enc/backward_references_enc.c
@@ -10,6 +10,8 @@
 // Author: Jyrki Alakuijala (jyrki@google.com)
 //
 
+#include "src/enc/backward_references_enc.h"
+
 #include <assert.h>
 #include <float.h>
 #include <math.h>
@@ -17,10 +19,11 @@
 #include "src/dsp/dsp.h"
 #include "src/dsp/lossless.h"
 #include "src/dsp/lossless_common.h"
-#include "src/enc/backward_references_enc.h"
 #include "src/enc/histogram_enc.h"
+#include "src/enc/vp8i_enc.h"
 #include "src/utils/color_cache_utils.h"
 #include "src/utils/utils.h"
+#include "src/webp/encode.h"
 
 #define MIN_BLOCK_SIZE 256  // minimum block size for backward references
 
@@ -255,10 +258,13 @@ static WEBP_INLINE int MaxFindCopyLength(int len) {
 
 int VP8LHashChainFill(VP8LHashChain* const p, int quality,
                       const uint32_t* const argb, int xsize, int ysize,
-                      int low_effort) {
+                      int low_effort, const WebPPicture* const pic,
+                      int percent_range, int* const percent) {
   const int size = xsize * ysize;
   const int iter_max = GetMaxItersForQuality(quality);
   const uint32_t window_size = GetWindowSizeForHashChain(quality, xsize);
+  int remaining_percent = percent_range;
+  int percent_start = *percent;
   int pos;
   int argb_comp;
   uint32_t base_position;
@@ -276,7 +282,13 @@ int VP8LHashChainFill(VP8LHashChain* const p, int quality,
 
   hash_to_first_index =
       (int32_t*)WebPSafeMalloc(HASH_SIZE, sizeof(*hash_to_first_index));
-  if (hash_to_first_index == NULL) return 0;
+  if (hash_to_first_index == NULL) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    return 0;
+  }
+
+  percent_range = remaining_percent / 2;
+  remaining_percent -= percent_range;
 
   // Set the int32_t array to -1.
   memset(hash_to_first_index, 0xff, HASH_SIZE * sizeof(*hash_to_first_index));
@@ -323,12 +335,22 @@ int VP8LHashChainFill(VP8LHashChain* const p, int quality,
       hash_to_first_index[hash_code] = pos++;
       argb_comp = argb_comp_next;
     }
+
+    if (!WebPReportProgress(
+            pic, percent_start + percent_range * pos / (size - 2), percent)) {
+      WebPSafeFree(hash_to_first_index);
+      return 0;
+    }
   }
   // Process the penultimate pixel.
   chain[pos] = hash_to_first_index[GetPixPairHash64(argb + pos)];
 
   WebPSafeFree(hash_to_first_index);
 
+  percent_start += percent_range;
+  if (!WebPReportProgress(pic, percent_start, percent)) return 0;
+  percent_range = remaining_percent;
+
   // Find the best match interval at each pixel, defined by an offset to the
   // pixel and a length. The right-most pixel cannot match anything to the right
   // (hence a best length of 0) and the left-most pixel nothing to the left
@@ -417,8 +439,17 @@ int VP8LHashChainFill(VP8LHashChain* const p, int quality,
         max_base_position = base_position;
       }
     }
+
+    if (!WebPReportProgress(pic,
+                            percent_start + percent_range *
+                                                (size - 2 - base_position) /
+                                                (size - 2),
+                            percent)) {
+      return 0;
+    }
   }
-  return 1;
+
+  return WebPReportProgress(pic, percent_start + percent_range, percent);
 }
 
 static WEBP_INLINE void AddSingleLiteral(uint32_t pixel, int use_color_cache,
@@ -728,7 +759,7 @@ static int CalculateBestCacheSize(const uint32_t* argb, int quality,
                                   int* const best_cache_bits) {
   int i;
   const int cache_bits_max = (quality <= 25) ? 0 : *best_cache_bits;
-  double entropy_min = MAX_ENTROPY;
+  float entropy_min = MAX_ENTROPY;
   int cc_init[MAX_COLOR_CACHE_BITS + 1] = { 0 };
   VP8LColorCache hashers[MAX_COLOR_CACHE_BITS + 1];
   VP8LRefsCursor c = VP8LRefsCursorInit(refs);
@@ -813,14 +844,14 @@ static int CalculateBestCacheSize(const uint32_t* argb, int quality,
   }
 
   for (i = 0; i <= cache_bits_max; ++i) {
-    const double entropy = VP8LHistogramEstimateBits(histos[i]);
+    const float entropy = VP8LHistogramEstimateBits(histos[i]);
     if (i == 0 || entropy < entropy_min) {
       entropy_min = entropy;
       *best_cache_bits = i;
     }
   }
   ok = 1;
-Error:
+ Error:
   for (i = 0; i <= cache_bits_max; ++i) {
     if (cc_init[i]) VP8LColorCacheClear(&hashers[i]);
     VP8LFreeHistogram(histos[i]);
@@ -890,7 +921,7 @@ static int GetBackwardReferences(int width, int height,
   int i, lz77_type;
   // Index 0 is for a color cache, index 1 for no cache (if needed).
   int lz77_types_best[2] = {0, 0};
-  double bit_costs_best[2] = {DBL_MAX, DBL_MAX};
+  float bit_costs_best[2] = {FLT_MAX, FLT_MAX};
   VP8LHashChain hash_chain_box;
   VP8LBackwardRefs* const refs_tmp = &refs[do_no_cache ? 2 : 1];
   int status = 0;
@@ -902,7 +933,7 @@ static int GetBackwardReferences(int width, int height,
   for (lz77_type = 1; lz77_types_to_try;
        lz77_types_to_try &= ~lz77_type, lz77_type <<= 1) {
     int res = 0;
-    double bit_cost = 0.;
+    float bit_cost = 0.f;
     if ((lz77_types_to_try & lz77_type) == 0) continue;
     switch (lz77_type) {
       case kLZ77RLE:
@@ -976,15 +1007,16 @@ static int GetBackwardReferences(int width, int height,
       const VP8LHashChain* const hash_chain_tmp =
           (lz77_types_best[i] == kLZ77Standard) ? hash_chain : &hash_chain_box;
       const int cache_bits = (i == 1) ? 0 : *cache_bits_best;
-      if (VP8LBackwardReferencesTraceBackwards(width, height, argb, cache_bits,
-                                               hash_chain_tmp, &refs[i],
-                                               refs_tmp)) {
-        double bit_cost_trace;
-        VP8LHistogramCreate(histo, refs_tmp, cache_bits);
-        bit_cost_trace = VP8LHistogramEstimateBits(histo);
-        if (bit_cost_trace < bit_costs_best[i]) {
-          BackwardRefsSwap(refs_tmp, &refs[i]);
-        }
+      float bit_cost_trace;
+      if (!VP8LBackwardReferencesTraceBackwards(width, height, argb, cache_bits,
+                                                hash_chain_tmp, &refs[i],
+                                                refs_tmp)) {
+        goto Error;
+      }
+      VP8LHistogramCreate(histo, refs_tmp, cache_bits);
+      bit_cost_trace = VP8LHistogramEstimateBits(histo);
+      if (bit_cost_trace < bit_costs_best[i]) {
+        BackwardRefsSwap(refs_tmp, &refs[i]);
       }
     }
 
@@ -1000,31 +1032,37 @@ static int GetBackwardReferences(int width, int height,
   }
   status = 1;
 
-Error:
+ Error:
   VP8LHashChainClear(&hash_chain_box);
   VP8LFreeHistogram(histo);
   return status;
 }
 
-WebPEncodingError VP8LGetBackwardReferences(
+int VP8LGetBackwardReferences(
     int width, int height, const uint32_t* const argb, int quality,
     int low_effort, int lz77_types_to_try, int cache_bits_max, int do_no_cache,
     const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs,
-    int* const cache_bits_best) {
+    int* const cache_bits_best, const WebPPicture* const pic, int percent_range,
+    int* const percent) {
   if (low_effort) {
     VP8LBackwardRefs* refs_best;
     *cache_bits_best = cache_bits_max;
     refs_best = GetBackwardReferencesLowEffort(
         width, height, argb, cache_bits_best, hash_chain, refs);
-    if (refs_best == NULL) return VP8_ENC_ERROR_OUT_OF_MEMORY;
+    if (refs_best == NULL) {
+      WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+      return 0;
+    }
     // Set it in first position.
     BackwardRefsSwap(refs_best, &refs[0]);
   } else {
     if (!GetBackwardReferences(width, height, argb, quality, lz77_types_to_try,
                                cache_bits_max, do_no_cache, hash_chain, refs,
                                cache_bits_best)) {
-      return VP8_ENC_ERROR_OUT_OF_MEMORY;
+      WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+      return 0;
     }
   }
-  return VP8_ENC_OK;
+
+  return WebPReportProgress(pic, *percent + percent_range, percent);
 }
diff --git a/thirdparty/libwebp/src/enc/backward_references_enc.h b/thirdparty/libwebp/src/enc/backward_references_enc.h
index 4c0267b41e..4dff1c27b5 100644
--- a/thirdparty/libwebp/src/enc/backward_references_enc.h
+++ b/thirdparty/libwebp/src/enc/backward_references_enc.h
@@ -134,10 +134,11 @@ struct VP8LHashChain {
 
 // Must be called first, to set size.
 int VP8LHashChainInit(VP8LHashChain* const p, int size);
-// Pre-compute the best matches for argb.
+// Pre-compute the best matches for argb. pic and percent are for progress.
 int VP8LHashChainFill(VP8LHashChain* const p, int quality,
                       const uint32_t* const argb, int xsize, int ysize,
-                      int low_effort);
+                      int low_effort, const WebPPicture* const pic,
+                      int percent_range, int* const percent);
 void VP8LHashChainClear(VP8LHashChain* const p);  // release memory
 
 static WEBP_INLINE int VP8LHashChainFindOffset(const VP8LHashChain* const p,
@@ -227,11 +228,14 @@ enum VP8LLZ77Type {
 // VP8LBackwardRefs is put in the first element, the best value with no-cache in
 // the second element.
 // In both cases, the last element is used as temporary internally.
-WebPEncodingError VP8LGetBackwardReferences(
+// pic and percent are for progress.
+// Returns false in case of error (stored in pic->error_code).
+int VP8LGetBackwardReferences(
     int width, int height, const uint32_t* const argb, int quality,
     int low_effort, int lz77_types_to_try, int cache_bits_max, int do_no_cache,
     const VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs,
-    int* const cache_bits_best);
+    int* const cache_bits_best, const WebPPicture* const pic, int percent_range,
+    int* const percent);
 
 #ifdef __cplusplus
 }
diff --git a/thirdparty/libwebp/src/enc/histogram_enc.c b/thirdparty/libwebp/src/enc/histogram_enc.c
index 38a0cebcab..8418def2e1 100644
--- a/thirdparty/libwebp/src/enc/histogram_enc.c
+++ b/thirdparty/libwebp/src/enc/histogram_enc.c
@@ -13,15 +13,17 @@
 #include "src/webp/config.h"
 #endif
 
+#include <float.h>
 #include <math.h>
 
-#include "src/enc/backward_references_enc.h"
-#include "src/enc/histogram_enc.h"
 #include "src/dsp/lossless.h"
 #include "src/dsp/lossless_common.h"
+#include "src/enc/backward_references_enc.h"
+#include "src/enc/histogram_enc.h"
+#include "src/enc/vp8i_enc.h"
 #include "src/utils/utils.h"
 
-#define MAX_COST 1.e38
+#define MAX_BIT_COST FLT_MAX
 
 // Number of partitions for the three dominant (literal, red and blue) symbol
 // costs.
@@ -228,8 +230,8 @@ void VP8LHistogramAddSinglePixOrCopy(VP8LHistogram* const histo,
 // -----------------------------------------------------------------------------
 // Entropy-related functions.
 
-static WEBP_INLINE double BitsEntropyRefine(const VP8LBitEntropy* entropy) {
-  double mix;
+static WEBP_INLINE float BitsEntropyRefine(const VP8LBitEntropy* entropy) {
+  float mix;
   if (entropy->nonzeros < 5) {
     if (entropy->nonzeros <= 1) {
       return 0;
@@ -238,67 +240,67 @@ static WEBP_INLINE double BitsEntropyRefine(const VP8LBitEntropy* entropy) {
     // Let's mix in a bit of entropy to favor good clustering when
     // distributions of these are combined.
     if (entropy->nonzeros == 2) {
-      return 0.99 * entropy->sum + 0.01 * entropy->entropy;
+      return 0.99f * entropy->sum + 0.01f * entropy->entropy;
     }
     // No matter what the entropy says, we cannot be better than min_limit
     // with Huffman coding. I am mixing a bit of entropy into the
     // min_limit since it produces much better (~0.5 %) compression results
     // perhaps because of better entropy clustering.
     if (entropy->nonzeros == 3) {
-      mix = 0.95;
+      mix = 0.95f;
     } else {
-      mix = 0.7;  // nonzeros == 4.
+      mix = 0.7f;  // nonzeros == 4.
     }
   } else {
-    mix = 0.627;
+    mix = 0.627f;
   }
 
   {
-    double min_limit = 2 * entropy->sum - entropy->max_val;
-    min_limit = mix * min_limit + (1.0 - mix) * entropy->entropy;
+    float min_limit = 2.f * entropy->sum - entropy->max_val;
+    min_limit = mix * min_limit + (1.f - mix) * entropy->entropy;
     return (entropy->entropy < min_limit) ? min_limit : entropy->entropy;
   }
 }
 
-double VP8LBitsEntropy(const uint32_t* const array, int n) {
+float VP8LBitsEntropy(const uint32_t* const array, int n) {
   VP8LBitEntropy entropy;
   VP8LBitsEntropyUnrefined(array, n, &entropy);
 
   return BitsEntropyRefine(&entropy);
 }
 
-static double InitialHuffmanCost(void) {
+static float InitialHuffmanCost(void) {
   // Small bias because Huffman code length is typically not stored in
   // full length.
   static const int kHuffmanCodeOfHuffmanCodeSize = CODE_LENGTH_CODES * 3;
-  static const double kSmallBias = 9.1;
+  static const float kSmallBias = 9.1f;
   return kHuffmanCodeOfHuffmanCodeSize - kSmallBias;
 }
 
 // Finalize the Huffman cost based on streak numbers and length type (<3 or >=3)
-static double FinalHuffmanCost(const VP8LStreaks* const stats) {
+static float FinalHuffmanCost(const VP8LStreaks* const stats) {
   // The constants in this function are experimental and got rounded from
   // their original values in 1/8 when switched to 1/1024.
-  double retval = InitialHuffmanCost();
+  float retval = InitialHuffmanCost();
   // Second coefficient: Many zeros in the histogram are covered efficiently
   // by a run-length encode. Originally 2/8.
-  retval += stats->counts[0] * 1.5625 + 0.234375 * stats->streaks[0][1];
+  retval += stats->counts[0] * 1.5625f + 0.234375f * stats->streaks[0][1];
   // Second coefficient: Constant values are encoded less efficiently, but still
   // RLE'ed. Originally 6/8.
-  retval += stats->counts[1] * 2.578125 + 0.703125 * stats->streaks[1][1];
+  retval += stats->counts[1] * 2.578125f + 0.703125f * stats->streaks[1][1];
   // 0s are usually encoded more efficiently than non-0s.
   // Originally 15/8.
-  retval += 1.796875 * stats->streaks[0][0];
+  retval += 1.796875f * stats->streaks[0][0];
   // Originally 26/8.
-  retval += 3.28125 * stats->streaks[1][0];
+  retval += 3.28125f * stats->streaks[1][0];
   return retval;
 }
 
 // Get the symbol entropy for the distribution 'population'.
 // Set 'trivial_sym', if there's only one symbol present in the distribution.
-static double PopulationCost(const uint32_t* const population, int length,
-                             uint32_t* const trivial_sym,
-                             uint8_t* const is_used) {
+static float PopulationCost(const uint32_t* const population, int length,
+                            uint32_t* const trivial_sym,
+                            uint8_t* const is_used) {
   VP8LBitEntropy bit_entropy;
   VP8LStreaks stats;
   VP8LGetEntropyUnrefined(population, length, &bit_entropy, &stats);
@@ -314,11 +316,10 @@ static double PopulationCost(const uint32_t* const population, int length,
 
 // trivial_at_end is 1 if the two histograms only have one element that is
 // non-zero: both the zero-th one, or both the last one.
-static WEBP_INLINE double GetCombinedEntropy(const uint32_t* const X,
-                                             const uint32_t* const Y,
-                                             int length, int is_X_used,
-                                             int is_Y_used,
-                                             int trivial_at_end) {
+static WEBP_INLINE float GetCombinedEntropy(const uint32_t* const X,
+                                            const uint32_t* const Y, int length,
+                                            int is_X_used, int is_Y_used,
+                                            int trivial_at_end) {
   VP8LStreaks stats;
   if (trivial_at_end) {
     // This configuration is due to palettization that transforms an indexed
@@ -356,7 +357,7 @@ static WEBP_INLINE double GetCombinedEntropy(const uint32_t* const X,
 }
 
 // Estimates the Entropy + Huffman + other block overhead size cost.
-double VP8LHistogramEstimateBits(VP8LHistogram* const p) {
+float VP8LHistogramEstimateBits(VP8LHistogram* const p) {
   return
       PopulationCost(p->literal_, VP8LHistogramNumCodes(p->palette_code_bits_),
                      NULL, &p->is_used_[0])
@@ -373,8 +374,7 @@ double VP8LHistogramEstimateBits(VP8LHistogram* const p) {
 
 static int GetCombinedHistogramEntropy(const VP8LHistogram* const a,
                                        const VP8LHistogram* const b,
-                                       double cost_threshold,
-                                       double* cost) {
+                                       float cost_threshold, float* cost) {
   const int palette_code_bits = a->palette_code_bits_;
   int trivial_at_end = 0;
   assert(a->palette_code_bits_ == b->palette_code_bits_);
@@ -439,12 +439,11 @@ static WEBP_INLINE void HistogramAdd(const VP8LHistogram* const a,
 // Since the previous score passed is 'cost_threshold', we only need to compare
 // the partial cost against 'cost_threshold + C(a) + C(b)' to possibly bail-out
 // early.
-static double HistogramAddEval(const VP8LHistogram* const a,
-                               const VP8LHistogram* const b,
-                               VP8LHistogram* const out,
-                               double cost_threshold) {
-  double cost = 0;
-  const double sum_cost = a->bit_cost_ + b->bit_cost_;
+static float HistogramAddEval(const VP8LHistogram* const a,
+                              const VP8LHistogram* const b,
+                              VP8LHistogram* const out, float cost_threshold) {
+  float cost = 0;
+  const float sum_cost = a->bit_cost_ + b->bit_cost_;
   cost_threshold += sum_cost;
 
   if (GetCombinedHistogramEntropy(a, b, cost_threshold, &cost)) {
@@ -459,10 +458,10 @@ static double HistogramAddEval(const VP8LHistogram* const a,
 // Same as HistogramAddEval(), except that the resulting histogram
 // is not stored. Only the cost C(a+b) - C(a) is evaluated. We omit
 // the term C(b) which is constant over all the evaluations.
-static double HistogramAddThresh(const VP8LHistogram* const a,
-                                 const VP8LHistogram* const b,
-                                 double cost_threshold) {
-  double cost;
+static float HistogramAddThresh(const VP8LHistogram* const a,
+                                const VP8LHistogram* const b,
+                                float cost_threshold) {
+  float cost;
   assert(a != NULL && b != NULL);
   cost = -a->bit_cost_;
   GetCombinedHistogramEntropy(a, b, cost_threshold, &cost);
@@ -473,24 +472,22 @@ static double HistogramAddThresh(const VP8LHistogram* const a,
 
 // The structure to keep track of cost range for the three dominant entropy
 // symbols.
-// TODO(skal): Evaluate if float can be used here instead of double for
-// representing the entropy costs.
 typedef struct {
-  double literal_max_;
-  double literal_min_;
-  double red_max_;
-  double red_min_;
-  double blue_max_;
-  double blue_min_;
+  float literal_max_;
+  float literal_min_;
+  float red_max_;
+  float red_min_;
+  float blue_max_;
+  float blue_min_;
 } DominantCostRange;
 
 static void DominantCostRangeInit(DominantCostRange* const c) {
   c->literal_max_ = 0.;
-  c->literal_min_ = MAX_COST;
+  c->literal_min_ = MAX_BIT_COST;
   c->red_max_ = 0.;
-  c->red_min_ = MAX_COST;
+  c->red_min_ = MAX_BIT_COST;
   c->blue_max_ = 0.;
-  c->blue_min_ = MAX_COST;
+  c->blue_min_ = MAX_BIT_COST;
 }
 
 static void UpdateDominantCostRange(
@@ -505,10 +502,9 @@ static void UpdateDominantCostRange(
 
 static void UpdateHistogramCost(VP8LHistogram* const h) {
   uint32_t alpha_sym, red_sym, blue_sym;
-  const double alpha_cost =
-      PopulationCost(h->alpha_, NUM_LITERAL_CODES, &alpha_sym,
-                     &h->is_used_[3]);
-  const double distance_cost =
+  const float alpha_cost =
+      PopulationCost(h->alpha_, NUM_LITERAL_CODES, &alpha_sym, &h->is_used_[3]);
+  const float distance_cost =
       PopulationCost(h->distance_, NUM_DISTANCE_CODES, NULL, &h->is_used_[4]) +
       VP8LExtraCost(h->distance_, NUM_DISTANCE_CODES);
   const int num_codes = VP8LHistogramNumCodes(h->palette_code_bits_);
@@ -529,10 +525,10 @@ static void UpdateHistogramCost(VP8LHistogram* const h) {
   }
 }
 
-static int GetBinIdForEntropy(double min, double max, double val) {
-  const double range = max - min;
+static int GetBinIdForEntropy(float min, float max, float val) {
+  const float range = max - min;
   if (range > 0.) {
-    const double delta = val - min;
+    const float delta = val - min;
     return (int)((NUM_PARTITIONS - 1e-6) * delta / range);
   } else {
     return 0;
@@ -641,15 +637,11 @@ static void HistogramAnalyzeEntropyBin(VP8LHistogramSet* const image_histo,
 
 // Merges some histograms with same bin_id together if it's advantageous.
 // Sets the remaining histograms to NULL.
-static void HistogramCombineEntropyBin(VP8LHistogramSet* const image_histo,
-                                       int* num_used,
-                                       const uint16_t* const clusters,
-                                       uint16_t* const cluster_mappings,
-                                       VP8LHistogram* cur_combo,
-                                       const uint16_t* const bin_map,
-                                       int num_bins,
-                                       double combine_cost_factor,
-                                       int low_effort) {
+static void HistogramCombineEntropyBin(
+    VP8LHistogramSet* const image_histo, int* num_used,
+    const uint16_t* const clusters, uint16_t* const cluster_mappings,
+    VP8LHistogram* cur_combo, const uint16_t* const bin_map, int num_bins,
+    float combine_cost_factor, int low_effort) {
   VP8LHistogram** const histograms = image_histo->histograms;
   int idx;
   struct {
@@ -679,11 +671,10 @@ static void HistogramCombineEntropyBin(VP8LHistogramSet* const image_histo,
       cluster_mappings[clusters[idx]] = clusters[first];
     } else {
       // try to merge #idx into #first (both share the same bin_id)
-      const double bit_cost = histograms[idx]->bit_cost_;
-      const double bit_cost_thresh = -bit_cost * combine_cost_factor;
-      const double curr_cost_diff =
-          HistogramAddEval(histograms[first], histograms[idx],
-                           cur_combo, bit_cost_thresh);
+      const float bit_cost = histograms[idx]->bit_cost_;
+      const float bit_cost_thresh = -bit_cost * combine_cost_factor;
+      const float curr_cost_diff = HistogramAddEval(
+          histograms[first], histograms[idx], cur_combo, bit_cost_thresh);
       if (curr_cost_diff < bit_cost_thresh) {
         // Try to merge two histograms only if the combo is a trivial one or
         // the two candidate histograms are already non-trivial.
@@ -731,8 +722,8 @@ static uint32_t MyRand(uint32_t* const seed) {
 typedef struct {
   int idx1;
   int idx2;
-  double cost_diff;
-  double cost_combo;
+  float cost_diff;
+  float cost_combo;
 } HistogramPair;
 
 typedef struct {
@@ -787,10 +778,9 @@ static void HistoQueueUpdateHead(HistoQueue* const histo_queue,
 // Update the cost diff and combo of a pair of histograms. This needs to be
 // called when the the histograms have been merged with a third one.
 static void HistoQueueUpdatePair(const VP8LHistogram* const h1,
-                                 const VP8LHistogram* const h2,
-                                 double threshold,
+                                 const VP8LHistogram* const h2, float threshold,
                                  HistogramPair* const pair) {
-  const double sum_cost = h1->bit_cost_ + h2->bit_cost_;
+  const float sum_cost = h1->bit_cost_ + h2->bit_cost_;
   pair->cost_combo = 0.;
   GetCombinedHistogramEntropy(h1, h2, sum_cost + threshold, &pair->cost_combo);
   pair->cost_diff = pair->cost_combo - sum_cost;
@@ -799,9 +789,9 @@ static void HistoQueueUpdatePair(const VP8LHistogram* const h1,
 // Create a pair from indices "idx1" and "idx2" provided its cost
 // is inferior to "threshold", a negative entropy.
 // It returns the cost of the pair, or 0. if it superior to threshold.
-static double HistoQueuePush(HistoQueue* const histo_queue,
-                             VP8LHistogram** const histograms, int idx1,
-                             int idx2, double threshold) {
+static float HistoQueuePush(HistoQueue* const histo_queue,
+                            VP8LHistogram** const histograms, int idx1,
+                            int idx2, float threshold) {
   const VP8LHistogram* h1;
   const VP8LHistogram* h2;
   HistogramPair pair;
@@ -945,8 +935,8 @@ static int HistogramCombineStochastic(VP8LHistogramSet* const image_histo,
            ++tries_with_no_success < num_tries_no_success;
        ++iter) {
     int* mapping_index;
-    double best_cost =
-        (histo_queue.size == 0) ? 0. : histo_queue.queue[0].cost_diff;
+    float best_cost =
+        (histo_queue.size == 0) ? 0.f : histo_queue.queue[0].cost_diff;
     int best_idx1 = -1, best_idx2 = 1;
     const uint32_t rand_range = (*num_used - 1) * (*num_used);
     // (*num_used) / 2 was chosen empirically. Less means faster but worse
@@ -955,7 +945,7 @@ static int HistogramCombineStochastic(VP8LHistogramSet* const image_histo,
 
     // Pick random samples.
     for (j = 0; *num_used >= 2 && j < num_tries; ++j) {
-      double curr_cost;
+      float curr_cost;
       // Choose two different histograms at random and try to combine them.
       const uint32_t tmp = MyRand(&seed) % rand_range;
       uint32_t idx1 = tmp / (*num_used - 1);
@@ -1034,7 +1024,7 @@ static int HistogramCombineStochastic(VP8LHistogramSet* const image_histo,
   *do_greedy = (*num_used <= min_cluster_size);
   ok = 1;
 
-End:
+ End:
   HistoQueueClear(&histo_queue);
   WebPSafeFree(mappings);
   return ok;
@@ -1057,7 +1047,7 @@ static void HistogramRemap(const VP8LHistogramSet* const in,
   if (out_size > 1) {
     for (i = 0; i < in_size; ++i) {
       int best_out = 0;
-      double best_bits = MAX_COST;
+      float best_bits = MAX_BIT_COST;
       int k;
       if (in_histo[i] == NULL) {
         // Arbitrarily set to the previous value if unused to help future LZ77.
@@ -1065,7 +1055,7 @@ static void HistogramRemap(const VP8LHistogramSet* const in,
         continue;
       }
       for (k = 0; k < out_size; ++k) {
-        double cur_bits;
+        float cur_bits;
         cur_bits = HistogramAddThresh(out_histo[k], in_histo[i], best_bits);
         if (k == 0 || cur_bits < best_bits) {
           best_bits = cur_bits;
@@ -1093,13 +1083,13 @@ static void HistogramRemap(const VP8LHistogramSet* const in,
   }
 }
 
-static double GetCombineCostFactor(int histo_size, int quality) {
-  double combine_cost_factor = 0.16;
+static float GetCombineCostFactor(int histo_size, int quality) {
+  float combine_cost_factor = 0.16f;
   if (quality < 90) {
-    if (histo_size > 256) combine_cost_factor /= 2.;
-    if (histo_size > 512) combine_cost_factor /= 2.;
-    if (histo_size > 1024) combine_cost_factor /= 2.;
-    if (quality <= 50) combine_cost_factor /= 2.;
+    if (histo_size > 256) combine_cost_factor /= 2.f;
+    if (histo_size > 512) combine_cost_factor /= 2.f;
+    if (histo_size > 1024) combine_cost_factor /= 2.f;
+    if (quality <= 50) combine_cost_factor /= 2.f;
   }
   return combine_cost_factor;
 }
@@ -1169,13 +1159,13 @@ static void RemoveEmptyHistograms(VP8LHistogramSet* const image_histo) {
 }
 
 int VP8LGetHistoImageSymbols(int xsize, int ysize,
-                             const VP8LBackwardRefs* const refs,
-                             int quality, int low_effort,
-                             int histogram_bits, int cache_bits,
+                             const VP8LBackwardRefs* const refs, int quality,
+                             int low_effort, int histogram_bits, int cache_bits,
                              VP8LHistogramSet* const image_histo,
                              VP8LHistogram* const tmp_histo,
-                             uint16_t* const histogram_symbols) {
-  int ok = 0;
+                             uint16_t* const histogram_symbols,
+                             const WebPPicture* const pic, int percent_range,
+                             int* const percent) {
   const int histo_xsize =
       histogram_bits ? VP8LSubSampleSize(xsize, histogram_bits) : 1;
   const int histo_ysize =
@@ -1192,7 +1182,10 @@ int VP8LGetHistoImageSymbols(int xsize, int ysize,
       WebPSafeMalloc(2 * image_histo_raw_size, sizeof(map_tmp));
   uint16_t* const cluster_mappings = map_tmp + image_histo_raw_size;
   int num_used = image_histo_raw_size;
-  if (orig_histo == NULL || map_tmp == NULL) goto Error;
+  if (orig_histo == NULL || map_tmp == NULL) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    goto Error;
+  }
 
   // Construct the histograms from backward references.
   HistogramBuild(xsize, histogram_bits, refs, orig_histo);
@@ -1206,16 +1199,15 @@ int VP8LGetHistoImageSymbols(int xsize, int ysize,
 
   if (entropy_combine) {
     uint16_t* const bin_map = map_tmp;
-    const double combine_cost_factor =
+    const float combine_cost_factor =
         GetCombineCostFactor(image_histo_raw_size, quality);
     const uint32_t num_clusters = num_used;
 
     HistogramAnalyzeEntropyBin(image_histo, bin_map, low_effort);
     // Collapse histograms with similar entropy.
-    HistogramCombineEntropyBin(image_histo, &num_used, histogram_symbols,
-                               cluster_mappings, tmp_histo, bin_map,
-                               entropy_combine_num_bins, combine_cost_factor,
-                               low_effort);
+    HistogramCombineEntropyBin(
+        image_histo, &num_used, histogram_symbols, cluster_mappings, tmp_histo,
+        bin_map, entropy_combine_num_bins, combine_cost_factor, low_effort);
     OptimizeHistogramSymbols(image_histo, cluster_mappings, num_clusters,
                              map_tmp, histogram_symbols);
   }
@@ -1229,11 +1221,13 @@ int VP8LGetHistoImageSymbols(int xsize, int ysize,
     int do_greedy;
     if (!HistogramCombineStochastic(image_histo, &num_used, threshold_size,
                                     &do_greedy)) {
+      WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
       goto Error;
     }
     if (do_greedy) {
       RemoveEmptyHistograms(image_histo);
       if (!HistogramCombineGreedy(image_histo, &num_used)) {
+        WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
         goto Error;
       }
     }
@@ -1243,10 +1237,12 @@ int VP8LGetHistoImageSymbols(int xsize, int ysize,
   RemoveEmptyHistograms(image_histo);
   HistogramRemap(orig_histo, image_histo, histogram_symbols);
 
-  ok = 1;
+  if (!WebPReportProgress(pic, *percent + percent_range, percent)) {
+    goto Error;
+  }
 
  Error:
   VP8LFreeHistogramSet(orig_histo);
   WebPSafeFree(map_tmp);
-  return ok;
+  return (pic->error_code == VP8_ENC_OK);
 }
diff --git a/thirdparty/libwebp/src/enc/histogram_enc.h b/thirdparty/libwebp/src/enc/histogram_enc.h
index c3428b5d55..4c0bb97464 100644
--- a/thirdparty/libwebp/src/enc/histogram_enc.h
+++ b/thirdparty/libwebp/src/enc/histogram_enc.h
@@ -40,10 +40,10 @@ typedef struct {
   int palette_code_bits_;
   uint32_t trivial_symbol_;  // True, if histograms for Red, Blue & Alpha
                              // literal symbols are single valued.
-  double bit_cost_;          // cached value of bit cost.
-  double literal_cost_;      // Cached values of dominant entropy costs:
-  double red_cost_;          // literal, red & blue.
-  double blue_cost_;
+  float bit_cost_;           // cached value of bit cost.
+  float literal_cost_;       // Cached values of dominant entropy costs:
+  float red_cost_;           // literal, red & blue.
+  float blue_cost_;
   uint8_t is_used_[5];       // 5 for literal, red, blue, alpha, distance
 } VP8LHistogram;
 
@@ -105,21 +105,23 @@ static WEBP_INLINE int VP8LHistogramNumCodes(int palette_code_bits) {
       ((palette_code_bits > 0) ? (1 << palette_code_bits) : 0);
 }
 
-// Builds the histogram image.
+// Builds the histogram image. pic and percent are for progress.
+// Returns false in case of error (stored in pic->error_code).
 int VP8LGetHistoImageSymbols(int xsize, int ysize,
-                             const VP8LBackwardRefs* const refs,
-                             int quality, int low_effort,
-                             int histogram_bits, int cache_bits,
+                             const VP8LBackwardRefs* const refs, int quality,
+                             int low_effort, int histogram_bits, int cache_bits,
                              VP8LHistogramSet* const image_histo,
                              VP8LHistogram* const tmp_histo,
-                             uint16_t* const histogram_symbols);
+                             uint16_t* const histogram_symbols,
+                             const WebPPicture* const pic, int percent_range,
+                             int* const percent);
 
 // Returns the entropy for the symbols in the input array.
-double VP8LBitsEntropy(const uint32_t* const array, int n);
+float VP8LBitsEntropy(const uint32_t* const array, int n);
 
 // Estimate how many bits the combined entropy of literals and distance
 // approximately maps to.
-double VP8LHistogramEstimateBits(VP8LHistogram* const p);
+float VP8LHistogramEstimateBits(VP8LHistogram* const p);
 
 #ifdef __cplusplus
 }
diff --git a/thirdparty/libwebp/src/enc/picture_csp_enc.c b/thirdparty/libwebp/src/enc/picture_csp_enc.c
index 35eede9635..fabebcf202 100644
--- a/thirdparty/libwebp/src/enc/picture_csp_enc.c
+++ b/thirdparty/libwebp/src/enc/picture_csp_enc.c
@@ -15,12 +15,19 @@
 #include <stdlib.h>
 #include <math.h>
 
+#include "sharpyuv/sharpyuv.h"
+#include "sharpyuv/sharpyuv_csp.h"
 #include "src/enc/vp8i_enc.h"
 #include "src/utils/random_utils.h"
 #include "src/utils/utils.h"
 #include "src/dsp/dsp.h"
 #include "src/dsp/lossless.h"
 #include "src/dsp/yuv.h"
+#include "src/dsp/cpu.h"
+
+#if defined(WEBP_USE_THREAD) && !defined(_WIN32)
+#include <pthread.h>
+#endif
 
 // Uncomment to disable gamma-compression during RGB->U/V averaging
 #define USE_GAMMA_COMPRESSION
@@ -76,16 +83,16 @@ int WebPPictureHasTransparency(const WebPPicture* picture) {
 
 #if defined(USE_GAMMA_COMPRESSION)
 
-// gamma-compensates loss of resolution during chroma subsampling
-#define kGamma 0.80      // for now we use a different gamma value than kGammaF
-#define kGammaFix 12     // fixed-point precision for linear values
-#define kGammaScale ((1 << kGammaFix) - 1)
-#define kGammaTabFix 7   // fixed-point fractional bits precision
-#define kGammaTabScale (1 << kGammaTabFix)
-#define kGammaTabRounder (kGammaTabScale >> 1)
-#define kGammaTabSize (1 << (kGammaFix - kGammaTabFix))
+// Gamma correction compensates loss of resolution during chroma subsampling.
+#define GAMMA_FIX 12      // fixed-point precision for linear values
+#define GAMMA_TAB_FIX 7   // fixed-point fractional bits precision
+#define GAMMA_TAB_SIZE (1 << (GAMMA_FIX - GAMMA_TAB_FIX))
+static const double kGamma = 0.80;
+static const int kGammaScale = ((1 << GAMMA_FIX) - 1);
+static const int kGammaTabScale = (1 << GAMMA_TAB_FIX);
+static const int kGammaTabRounder = (1 << GAMMA_TAB_FIX >> 1);
 
-static int kLinearToGammaTab[kGammaTabSize + 1];
+static int kLinearToGammaTab[GAMMA_TAB_SIZE + 1];
 static uint16_t kGammaToLinearTab[256];
 static volatile int kGammaTablesOk = 0;
 static void InitGammaTables(void);
@@ -93,13 +100,13 @@ static void InitGammaTables(void);
 WEBP_DSP_INIT_FUNC(InitGammaTables) {
   if (!kGammaTablesOk) {
     int v;
-    const double scale = (double)(1 << kGammaTabFix) / kGammaScale;
+    const double scale = (double)(1 << GAMMA_TAB_FIX) / kGammaScale;
     const double norm = 1. / 255.;
     for (v = 0; v <= 255; ++v) {
       kGammaToLinearTab[v] =
           (uint16_t)(pow(norm * v, kGamma) * kGammaScale + .5);
     }
-    for (v = 0; v <= kGammaTabSize; ++v) {
+    for (v = 0; v <= GAMMA_TAB_SIZE; ++v) {
       kLinearToGammaTab[v] = (int)(255. * pow(scale * v, 1. / kGamma) + .5);
     }
     kGammaTablesOk = 1;
@@ -111,12 +118,12 @@ static WEBP_INLINE uint32_t GammaToLinear(uint8_t v) {
 }
 
 static WEBP_INLINE int Interpolate(int v) {
-  const int tab_pos = v >> (kGammaTabFix + 2);    // integer part
+  const int tab_pos = v >> (GAMMA_TAB_FIX + 2);    // integer part
   const int x = v & ((kGammaTabScale << 2) - 1);  // fractional part
   const int v0 = kLinearToGammaTab[tab_pos];
   const int v1 = kLinearToGammaTab[tab_pos + 1];
   const int y = v1 * x + v0 * ((kGammaTabScale << 2) - x);   // interpolate
-  assert(tab_pos + 1 < kGammaTabSize + 1);
+  assert(tab_pos + 1 < GAMMA_TAB_SIZE + 1);
   return y;
 }
 
@@ -124,7 +131,7 @@ static WEBP_INLINE int Interpolate(int v) {
 // U/V value, suitable for RGBToU/V calls.
 static WEBP_INLINE int LinearToGamma(uint32_t base_value, int shift) {
   const int y = Interpolate(base_value << shift);   // final uplifted value
-  return (y + kGammaTabRounder) >> kGammaTabFix;    // descale
+  return (y + kGammaTabRounder) >> GAMMA_TAB_FIX;    // descale
 }
 
 #else
@@ -158,415 +165,41 @@ static int RGBToV(int r, int g, int b, VP8Random* const rg) {
 //------------------------------------------------------------------------------
 // Sharp RGB->YUV conversion
 
-static const int kNumIterations = 4;
 static const int kMinDimensionIterativeConversion = 4;
 
-// We could use SFIX=0 and only uint8_t for fixed_y_t, but it produces some
-// banding sometimes. Better use extra precision.
-#define SFIX 2                // fixed-point precision of RGB and Y/W
-typedef int16_t fixed_t;      // signed type with extra SFIX precision for UV
-typedef uint16_t fixed_y_t;   // unsigned type with extra SFIX precision for W
-
-#define SHALF (1 << SFIX >> 1)
-#define MAX_Y_T ((256 << SFIX) - 1)
-#define SROUNDER (1 << (YUV_FIX + SFIX - 1))
-
-#if defined(USE_GAMMA_COMPRESSION)
-
-// We use tables of different size and precision for the Rec709 / BT2020
-// transfer function.
-#define kGammaF (1./0.45)
-static uint32_t kLinearToGammaTabS[kGammaTabSize + 2];
-#define GAMMA_TO_LINEAR_BITS 14
-static uint32_t kGammaToLinearTabS[MAX_Y_T + 1];   // size scales with Y_FIX
-static volatile int kGammaTablesSOk = 0;
-static void InitGammaTablesS(void);
-
-WEBP_DSP_INIT_FUNC(InitGammaTablesS) {
-  assert(2 * GAMMA_TO_LINEAR_BITS < 32);  // we use uint32_t intermediate values
-  if (!kGammaTablesSOk) {
-    int v;
-    const double norm = 1. / MAX_Y_T;
-    const double scale = 1. / kGammaTabSize;
-    const double a = 0.09929682680944;
-    const double thresh = 0.018053968510807;
-    const double final_scale = 1 << GAMMA_TO_LINEAR_BITS;
-    for (v = 0; v <= MAX_Y_T; ++v) {
-      const double g = norm * v;
-      double value;
-      if (g <= thresh * 4.5) {
-        value = g / 4.5;
-      } else {
-        const double a_rec = 1. / (1. + a);
-        value = pow(a_rec * (g + a), kGammaF);
-      }
-      kGammaToLinearTabS[v] = (uint32_t)(value * final_scale + .5);
-    }
-    for (v = 0; v <= kGammaTabSize; ++v) {
-      const double g = scale * v;
-      double value;
-      if (g <= thresh) {
-        value = 4.5 * g;
-      } else {
-        value = (1. + a) * pow(g, 1. / kGammaF) - a;
-      }
-      // we already incorporate the 1/2 rounding constant here
-      kLinearToGammaTabS[v] =
-          (uint32_t)(MAX_Y_T * value) + (1 << GAMMA_TO_LINEAR_BITS >> 1);
-    }
-    // to prevent small rounding errors to cause read-overflow:
-    kLinearToGammaTabS[kGammaTabSize + 1] = kLinearToGammaTabS[kGammaTabSize];
-    kGammaTablesSOk = 1;
-  }
-}
-
-// return value has a fixed-point precision of GAMMA_TO_LINEAR_BITS
-static WEBP_INLINE uint32_t GammaToLinearS(int v) {
-  return kGammaToLinearTabS[v];
-}
-
-static WEBP_INLINE uint32_t LinearToGammaS(uint32_t value) {
-  // 'value' is in GAMMA_TO_LINEAR_BITS fractional precision
-  const uint32_t v = value * kGammaTabSize;
-  const uint32_t tab_pos = v >> GAMMA_TO_LINEAR_BITS;
-  // fractional part, in GAMMA_TO_LINEAR_BITS fixed-point precision
-  const uint32_t x = v - (tab_pos << GAMMA_TO_LINEAR_BITS);  // fractional part
-  // v0 / v1 are in GAMMA_TO_LINEAR_BITS fixed-point precision (range [0..1])
-  const uint32_t v0 = kLinearToGammaTabS[tab_pos + 0];
-  const uint32_t v1 = kLinearToGammaTabS[tab_pos + 1];
-  // Final interpolation. Note that rounding is already included.
-  const uint32_t v2 = (v1 - v0) * x;    // note: v1 >= v0.
-  const uint32_t result = v0 + (v2 >> GAMMA_TO_LINEAR_BITS);
-  return result;
-}
-
-#else
-
-static void InitGammaTablesS(void) {}
-static WEBP_INLINE uint32_t GammaToLinearS(int v) {
-  return (v << GAMMA_TO_LINEAR_BITS) / MAX_Y_T;
-}
-static WEBP_INLINE uint32_t LinearToGammaS(uint32_t value) {
-  return (MAX_Y_T * value) >> GAMMA_TO_LINEAR_BITS;
-}
-
-#endif    // USE_GAMMA_COMPRESSION
-
-//------------------------------------------------------------------------------
-
-static uint8_t clip_8b(fixed_t v) {
-  return (!(v & ~0xff)) ? (uint8_t)v : (v < 0) ? 0u : 255u;
-}
-
-static fixed_y_t clip_y(int y) {
-  return (!(y & ~MAX_Y_T)) ? (fixed_y_t)y : (y < 0) ? 0 : MAX_Y_T;
-}
-
-//------------------------------------------------------------------------------
-
-static int RGBToGray(int r, int g, int b) {
-  const int luma = 13933 * r + 46871 * g + 4732 * b + YUV_HALF;
-  return (luma >> YUV_FIX);
-}
-
-static uint32_t ScaleDown(int a, int b, int c, int d) {
-  const uint32_t A = GammaToLinearS(a);
-  const uint32_t B = GammaToLinearS(b);
-  const uint32_t C = GammaToLinearS(c);
-  const uint32_t D = GammaToLinearS(d);
-  return LinearToGammaS((A + B + C + D + 2) >> 2);
-}
-
-static WEBP_INLINE void UpdateW(const fixed_y_t* src, fixed_y_t* dst, int w) {
-  int i;
-  for (i = 0; i < w; ++i) {
-    const uint32_t R = GammaToLinearS(src[0 * w + i]);
-    const uint32_t G = GammaToLinearS(src[1 * w + i]);
-    const uint32_t B = GammaToLinearS(src[2 * w + i]);
-    const uint32_t Y = RGBToGray(R, G, B);
-    dst[i] = (fixed_y_t)LinearToGammaS(Y);
-  }
-}
-
-static void UpdateChroma(const fixed_y_t* src1, const fixed_y_t* src2,
-                         fixed_t* dst, int uv_w) {
-  int i;
-  for (i = 0; i < uv_w; ++i) {
-    const int r = ScaleDown(src1[0 * uv_w + 0], src1[0 * uv_w + 1],
-                            src2[0 * uv_w + 0], src2[0 * uv_w + 1]);
-    const int g = ScaleDown(src1[2 * uv_w + 0], src1[2 * uv_w + 1],
-                            src2[2 * uv_w + 0], src2[2 * uv_w + 1]);
-    const int b = ScaleDown(src1[4 * uv_w + 0], src1[4 * uv_w + 1],
-                            src2[4 * uv_w + 0], src2[4 * uv_w + 1]);
-    const int W = RGBToGray(r, g, b);
-    dst[0 * uv_w] = (fixed_t)(r - W);
-    dst[1 * uv_w] = (fixed_t)(g - W);
-    dst[2 * uv_w] = (fixed_t)(b - W);
-    dst  += 1;
-    src1 += 2;
-    src2 += 2;
-  }
-}
-
-static void StoreGray(const fixed_y_t* rgb, fixed_y_t* y, int w) {
-  int i;
-  for (i = 0; i < w; ++i) {
-    y[i] = RGBToGray(rgb[0 * w + i], rgb[1 * w + i], rgb[2 * w + i]);
-  }
-}
-
-//------------------------------------------------------------------------------
-
-static WEBP_INLINE fixed_y_t Filter2(int A, int B, int W0) {
-  const int v0 = (A * 3 + B + 2) >> 2;
-  return clip_y(v0 + W0);
-}
-
 //------------------------------------------------------------------------------
+// Main function
 
-static WEBP_INLINE fixed_y_t UpLift(uint8_t a) {  // 8bit -> SFIX
-  return ((fixed_y_t)a << SFIX) | SHALF;
-}
-
-static void ImportOneRow(const uint8_t* const r_ptr,
-                         const uint8_t* const g_ptr,
-                         const uint8_t* const b_ptr,
-                         int step,
-                         int pic_width,
-                         fixed_y_t* const dst) {
-  int i;
-  const int w = (pic_width + 1) & ~1;
-  for (i = 0; i < pic_width; ++i) {
-    const int off = i * step;
-    dst[i + 0 * w] = UpLift(r_ptr[off]);
-    dst[i + 1 * w] = UpLift(g_ptr[off]);
-    dst[i + 2 * w] = UpLift(b_ptr[off]);
-  }
-  if (pic_width & 1) {  // replicate rightmost pixel
-    dst[pic_width + 0 * w] = dst[pic_width + 0 * w - 1];
-    dst[pic_width + 1 * w] = dst[pic_width + 1 * w - 1];
-    dst[pic_width + 2 * w] = dst[pic_width + 2 * w - 1];
-  }
-}
-
-static void InterpolateTwoRows(const fixed_y_t* const best_y,
-                               const fixed_t* prev_uv,
-                               const fixed_t* cur_uv,
-                               const fixed_t* next_uv,
-                               int w,
-                               fixed_y_t* out1,
-                               fixed_y_t* out2) {
-  const int uv_w = w >> 1;
-  const int len = (w - 1) >> 1;   // length to filter
-  int k = 3;
-  while (k-- > 0) {   // process each R/G/B segments in turn
-    // special boundary case for i==0
-    out1[0] = Filter2(cur_uv[0], prev_uv[0], best_y[0]);
-    out2[0] = Filter2(cur_uv[0], next_uv[0], best_y[w]);
-
-    WebPSharpYUVFilterRow(cur_uv, prev_uv, len, best_y + 0 + 1, out1 + 1);
-    WebPSharpYUVFilterRow(cur_uv, next_uv, len, best_y + w + 1, out2 + 1);
-
-    // special boundary case for i == w - 1 when w is even
-    if (!(w & 1)) {
-      out1[w - 1] = Filter2(cur_uv[uv_w - 1], prev_uv[uv_w - 1],
-                            best_y[w - 1 + 0]);
-      out2[w - 1] = Filter2(cur_uv[uv_w - 1], next_uv[uv_w - 1],
-                            best_y[w - 1 + w]);
-    }
-    out1 += w;
-    out2 += w;
-    prev_uv += uv_w;
-    cur_uv  += uv_w;
-    next_uv += uv_w;
-  }
-}
-
-static WEBP_INLINE uint8_t ConvertRGBToY(int r, int g, int b) {
-  const int luma = 16839 * r + 33059 * g + 6420 * b + SROUNDER;
-  return clip_8b(16 + (luma >> (YUV_FIX + SFIX)));
-}
+extern void SharpYuvInit(VP8CPUInfo cpu_info_func);
 
-static WEBP_INLINE uint8_t ConvertRGBToU(int r, int g, int b) {
-  const int u =  -9719 * r - 19081 * g + 28800 * b + SROUNDER;
-  return clip_8b(128 + (u >> (YUV_FIX + SFIX)));
-}
+static void SafeInitSharpYuv(void) {
+#if defined(WEBP_USE_THREAD) && !defined(_WIN32)
+  static pthread_mutex_t initsharpyuv_lock = PTHREAD_MUTEX_INITIALIZER;
+  if (pthread_mutex_lock(&initsharpyuv_lock)) return;
+#endif
 
-static WEBP_INLINE uint8_t ConvertRGBToV(int r, int g, int b) {
-  const int v = +28800 * r - 24116 * g -  4684 * b + SROUNDER;
-  return clip_8b(128 + (v >> (YUV_FIX + SFIX)));
-}
+  SharpYuvInit(VP8GetCPUInfo);
 
-static int ConvertWRGBToYUV(const fixed_y_t* best_y, const fixed_t* best_uv,
-                            WebPPicture* const picture) {
-  int i, j;
-  uint8_t* dst_y = picture->y;
-  uint8_t* dst_u = picture->u;
-  uint8_t* dst_v = picture->v;
-  const fixed_t* const best_uv_base = best_uv;
-  const int w = (picture->width + 1) & ~1;
-  const int h = (picture->height + 1) & ~1;
-  const int uv_w = w >> 1;
-  const int uv_h = h >> 1;
-  for (best_uv = best_uv_base, j = 0; j < picture->height; ++j) {
-    for (i = 0; i < picture->width; ++i) {
-      const int off = (i >> 1);
-      const int W = best_y[i];
-      const int r = best_uv[off + 0 * uv_w] + W;
-      const int g = best_uv[off + 1 * uv_w] + W;
-      const int b = best_uv[off + 2 * uv_w] + W;
-      dst_y[i] = ConvertRGBToY(r, g, b);
-    }
-    best_y += w;
-    best_uv += (j & 1) * 3 * uv_w;
-    dst_y += picture->y_stride;
-  }
-  for (best_uv = best_uv_base, j = 0; j < uv_h; ++j) {
-    for (i = 0; i < uv_w; ++i) {
-      const int off = i;
-      const int r = best_uv[off + 0 * uv_w];
-      const int g = best_uv[off + 1 * uv_w];
-      const int b = best_uv[off + 2 * uv_w];
-      dst_u[i] = ConvertRGBToU(r, g, b);
-      dst_v[i] = ConvertRGBToV(r, g, b);
-    }
-    best_uv += 3 * uv_w;
-    dst_u += picture->uv_stride;
-    dst_v += picture->uv_stride;
-  }
-  return 1;
+#if defined(WEBP_USE_THREAD) && !defined(_WIN32)
+  (void)pthread_mutex_unlock(&initsharpyuv_lock);
+#endif
 }
 
-//------------------------------------------------------------------------------
-// Main function
-
-#define SAFE_ALLOC(W, H, T) ((T*)WebPSafeMalloc((W) * (H), sizeof(T)))
-
 static int PreprocessARGB(const uint8_t* r_ptr,
                           const uint8_t* g_ptr,
                           const uint8_t* b_ptr,
                           int step, int rgb_stride,
                           WebPPicture* const picture) {
-  // we expand the right/bottom border if needed
-  const int w = (picture->width + 1) & ~1;
-  const int h = (picture->height + 1) & ~1;
-  const int uv_w = w >> 1;
-  const int uv_h = h >> 1;
-  uint64_t prev_diff_y_sum = ~0;
-  int j, iter;
-
-  // TODO(skal): allocate one big memory chunk. But for now, it's easier
-  // for valgrind debugging to have several chunks.
-  fixed_y_t* const tmp_buffer = SAFE_ALLOC(w * 3, 2, fixed_y_t);   // scratch
-  fixed_y_t* const best_y_base = SAFE_ALLOC(w, h, fixed_y_t);
-  fixed_y_t* const target_y_base = SAFE_ALLOC(w, h, fixed_y_t);
-  fixed_y_t* const best_rgb_y = SAFE_ALLOC(w, 2, fixed_y_t);
-  fixed_t* const best_uv_base = SAFE_ALLOC(uv_w * 3, uv_h, fixed_t);
-  fixed_t* const target_uv_base = SAFE_ALLOC(uv_w * 3, uv_h, fixed_t);
-  fixed_t* const best_rgb_uv = SAFE_ALLOC(uv_w * 3, 1, fixed_t);
-  fixed_y_t* best_y = best_y_base;
-  fixed_y_t* target_y = target_y_base;
-  fixed_t* best_uv = best_uv_base;
-  fixed_t* target_uv = target_uv_base;
-  const uint64_t diff_y_threshold = (uint64_t)(3.0 * w * h);
-  int ok;
-
-  if (best_y_base == NULL || best_uv_base == NULL ||
-      target_y_base == NULL || target_uv_base == NULL ||
-      best_rgb_y == NULL || best_rgb_uv == NULL ||
-      tmp_buffer == NULL) {
-    ok = WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
-    goto End;
-  }
-  assert(picture->width >= kMinDimensionIterativeConversion);
-  assert(picture->height >= kMinDimensionIterativeConversion);
-
-  WebPInitConvertARGBToYUV();
-
-  // Import RGB samples to W/RGB representation.
-  for (j = 0; j < picture->height; j += 2) {
-    const int is_last_row = (j == picture->height - 1);
-    fixed_y_t* const src1 = tmp_buffer + 0 * w;
-    fixed_y_t* const src2 = tmp_buffer + 3 * w;
-
-    // prepare two rows of input
-    ImportOneRow(r_ptr, g_ptr, b_ptr, step, picture->width, src1);
-    if (!is_last_row) {
-      ImportOneRow(r_ptr + rgb_stride, g_ptr + rgb_stride, b_ptr + rgb_stride,
-                   step, picture->width, src2);
-    } else {
-      memcpy(src2, src1, 3 * w * sizeof(*src2));
-    }
-    StoreGray(src1, best_y + 0, w);
-    StoreGray(src2, best_y + w, w);
-
-    UpdateW(src1, target_y, w);
-    UpdateW(src2, target_y + w, w);
-    UpdateChroma(src1, src2, target_uv, uv_w);
-    memcpy(best_uv, target_uv, 3 * uv_w * sizeof(*best_uv));
-    best_y += 2 * w;
-    best_uv += 3 * uv_w;
-    target_y += 2 * w;
-    target_uv += 3 * uv_w;
-    r_ptr += 2 * rgb_stride;
-    g_ptr += 2 * rgb_stride;
-    b_ptr += 2 * rgb_stride;
-  }
-
-  // Iterate and resolve clipping conflicts.
-  for (iter = 0; iter < kNumIterations; ++iter) {
-    const fixed_t* cur_uv = best_uv_base;
-    const fixed_t* prev_uv = best_uv_base;
-    uint64_t diff_y_sum = 0;
-
-    best_y = best_y_base;
-    best_uv = best_uv_base;
-    target_y = target_y_base;
-    target_uv = target_uv_base;
-    for (j = 0; j < h; j += 2) {
-      fixed_y_t* const src1 = tmp_buffer + 0 * w;
-      fixed_y_t* const src2 = tmp_buffer + 3 * w;
-      {
-        const fixed_t* const next_uv = cur_uv + ((j < h - 2) ? 3 * uv_w : 0);
-        InterpolateTwoRows(best_y, prev_uv, cur_uv, next_uv, w, src1, src2);
-        prev_uv = cur_uv;
-        cur_uv = next_uv;
-      }
-
-      UpdateW(src1, best_rgb_y + 0 * w, w);
-      UpdateW(src2, best_rgb_y + 1 * w, w);
-      UpdateChroma(src1, src2, best_rgb_uv, uv_w);
-
-      // update two rows of Y and one row of RGB
-      diff_y_sum += WebPSharpYUVUpdateY(target_y, best_rgb_y, best_y, 2 * w);
-      WebPSharpYUVUpdateRGB(target_uv, best_rgb_uv, best_uv, 3 * uv_w);
-
-      best_y += 2 * w;
-      best_uv += 3 * uv_w;
-      target_y += 2 * w;
-      target_uv += 3 * uv_w;
-    }
-    // test exit condition
-    if (iter > 0) {
-      if (diff_y_sum < diff_y_threshold) break;
-      if (diff_y_sum > prev_diff_y_sum) break;
-    }
-    prev_diff_y_sum = diff_y_sum;
+  const int ok = SharpYuvConvert(
+      r_ptr, g_ptr, b_ptr, step, rgb_stride, /*rgb_bit_depth=*/8,
+      picture->y, picture->y_stride, picture->u, picture->uv_stride, picture->v,
+      picture->uv_stride, /*yuv_bit_depth=*/8, picture->width,
+      picture->height, SharpYuvGetConversionMatrix(kSharpYuvMatrixWebp));
+  if (!ok) {
+    return WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
   }
-  // final reconstruction
-  ok = ConvertWRGBToYUV(best_y_base, best_uv_base, picture);
-
- End:
-  WebPSafeFree(best_y_base);
-  WebPSafeFree(best_uv_base);
-  WebPSafeFree(target_y_base);
-  WebPSafeFree(target_uv_base);
-  WebPSafeFree(best_rgb_y);
-  WebPSafeFree(best_rgb_uv);
-  WebPSafeFree(tmp_buffer);
   return ok;
 }
-#undef SAFE_ALLOC
 
 //------------------------------------------------------------------------------
 // "Fast" regular RGB->YUV
@@ -591,8 +224,8 @@ static const int kAlphaFix = 19;
 // and constant are adjusted very tightly to fit 32b arithmetic.
 // In particular, they use the fact that the operands for 'v / a' are actually
 // derived as v = (a0.p0 + a1.p1 + a2.p2 + a3.p3) and a = a0 + a1 + a2 + a3
-// with ai in [0..255] and pi in [0..1<<kGammaFix). The constraint to avoid
-// overflow is: kGammaFix + kAlphaFix <= 31.
+// with ai in [0..255] and pi in [0..1<<GAMMA_FIX). The constraint to avoid
+// overflow is: GAMMA_FIX + kAlphaFix <= 31.
 static const uint32_t kInvAlpha[4 * 0xff + 1] = {
   0,  /* alpha = 0 */
   524288, 262144, 174762, 131072, 104857, 87381, 74898, 65536,
@@ -818,11 +451,20 @@ static WEBP_INLINE void AccumulateRGB(const uint8_t* const r_ptr,
     dst[0] = SUM4(r_ptr + j, step);
     dst[1] = SUM4(g_ptr + j, step);
     dst[2] = SUM4(b_ptr + j, step);
+    // MemorySanitizer may raise false positives with data that passes through
+    // RGBA32PackedToPlanar_16b_SSE41() due to incorrect modeling of shuffles.
+    // See https://crbug.com/webp/573.
+#ifdef WEBP_MSAN
+    dst[3] = 0;
+#endif
   }
   if (width & 1) {
     dst[0] = SUM2(r_ptr + j);
     dst[1] = SUM2(g_ptr + j);
     dst[2] = SUM2(b_ptr + j);
+#ifdef WEBP_MSAN
+    dst[3] = 0;
+#endif
   }
 }
 
@@ -863,18 +505,18 @@ static int ImportYUVAFromRGBA(const uint8_t* r_ptr,
     use_iterative_conversion = 0;
   }
 
-  if (!WebPPictureAllocYUVA(picture, width, height)) {
+  if (!WebPPictureAllocYUVA(picture)) {
     return 0;
   }
   if (has_alpha) {
     assert(step == 4);
 #if defined(USE_GAMMA_COMPRESSION) && defined(USE_INVERSE_ALPHA_TABLE)
-    assert(kAlphaFix + kGammaFix <= 31);
+    assert(kAlphaFix + GAMMA_FIX <= 31);
 #endif
   }
 
   if (use_iterative_conversion) {
-    InitGammaTablesS();
+    SafeInitSharpYuv();
     if (!PreprocessARGB(r_ptr, g_ptr, b_ptr, step, rgb_stride, picture)) {
       return 0;
     }
@@ -1044,7 +686,7 @@ int WebPPictureYUVAToARGB(WebPPicture* picture) {
     return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION);
   }
   // Allocate a new argb buffer (discarding the previous one).
-  if (!WebPPictureAllocARGB(picture, picture->width, picture->height)) return 0;
+  if (!WebPPictureAllocARGB(picture)) return 0;
   picture->use_argb = 1;
 
   // Convert
@@ -1106,6 +748,8 @@ static int Import(WebPPicture* const picture,
   const int width = picture->width;
   const int height = picture->height;
 
+  if (abs(rgb_stride) < (import_alpha ? 4 : 3) * width) return 0;
+
   if (!picture->use_argb) {
     const uint8_t* a_ptr = import_alpha ? rgb + 3 : NULL;
     return ImportYUVAFromRGBA(r_ptr, g_ptr, b_ptr, a_ptr, step, rgb_stride,
@@ -1163,24 +807,24 @@ static int Import(WebPPicture* const picture,
 #if !defined(WEBP_REDUCE_CSP)
 
 int WebPPictureImportBGR(WebPPicture* picture,
-                         const uint8_t* rgb, int rgb_stride) {
-  return (picture != NULL && rgb != NULL)
-             ? Import(picture, rgb, rgb_stride, 3, 1, 0)
+                         const uint8_t* bgr, int bgr_stride) {
+  return (picture != NULL && bgr != NULL)
+             ? Import(picture, bgr, bgr_stride, 3, 1, 0)
              : 0;
 }
 
 int WebPPictureImportBGRA(WebPPicture* picture,
-                          const uint8_t* rgba, int rgba_stride) {
-  return (picture != NULL && rgba != NULL)
-             ? Import(picture, rgba, rgba_stride, 4, 1, 1)
+                          const uint8_t* bgra, int bgra_stride) {
+  return (picture != NULL && bgra != NULL)
+             ? Import(picture, bgra, bgra_stride, 4, 1, 1)
              : 0;
 }
 
 
 int WebPPictureImportBGRX(WebPPicture* picture,
-                          const uint8_t* rgba, int rgba_stride) {
-  return (picture != NULL && rgba != NULL)
-             ? Import(picture, rgba, rgba_stride, 4, 1, 0)
+                          const uint8_t* bgrx, int bgrx_stride) {
+  return (picture != NULL && bgrx != NULL)
+             ? Import(picture, bgrx, bgrx_stride, 4, 1, 0)
              : 0;
 }
 
@@ -1201,9 +845,9 @@ int WebPPictureImportRGBA(WebPPicture* picture,
 }
 
 int WebPPictureImportRGBX(WebPPicture* picture,
-                          const uint8_t* rgba, int rgba_stride) {
-  return (picture != NULL && rgba != NULL)
-             ? Import(picture, rgba, rgba_stride, 4, 0, 0)
+                          const uint8_t* rgbx, int rgbx_stride) {
+  return (picture != NULL && rgbx != NULL)
+             ? Import(picture, rgbx, rgbx_stride, 4, 0, 0)
              : 0;
 }
 
diff --git a/thirdparty/libwebp/src/enc/picture_enc.c b/thirdparty/libwebp/src/enc/picture_enc.c
index c691622d03..3af6383d38 100644
--- a/thirdparty/libwebp/src/enc/picture_enc.c
+++ b/thirdparty/libwebp/src/enc/picture_enc.c
@@ -45,6 +45,22 @@ int WebPPictureInitInternal(WebPPicture* picture, int version) {
 
 //------------------------------------------------------------------------------
 
+int WebPValidatePicture(const WebPPicture* const picture) {
+  if (picture == NULL) return 0;
+  if (picture->width <= 0 || picture->height <= 0) {
+    return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
+  }
+  if (picture->width <= 0 || picture->width / 4 > INT_MAX / 4 ||
+      picture->height <= 0 || picture->height / 4 > INT_MAX / 4) {
+    return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
+  }
+  if (picture->colorspace != WEBP_YUV420 &&
+      picture->colorspace != WEBP_YUV420A) {
+    return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION);
+  }
+  return 1;
+}
+
 static void WebPPictureResetBufferARGB(WebPPicture* const picture) {
   picture->memory_argb_ = NULL;
   picture->argb = NULL;
@@ -63,18 +79,17 @@ void WebPPictureResetBuffers(WebPPicture* const picture) {
   WebPPictureResetBufferYUVA(picture);
 }
 
-int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height) {
+int WebPPictureAllocARGB(WebPPicture* const picture) {
   void* memory;
+  const int width = picture->width;
+  const int height = picture->height;
   const uint64_t argb_size = (uint64_t)width * height;
 
-  assert(picture != NULL);
+  if (!WebPValidatePicture(picture)) return 0;
 
   WebPSafeFree(picture->memory_argb_);
   WebPPictureResetBufferARGB(picture);
 
-  if (width <= 0 || height <= 0) {
-    return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
-  }
   // allocate a new buffer.
   memory = WebPSafeMalloc(argb_size + WEBP_ALIGN_CST, sizeof(*picture->argb));
   if (memory == NULL) {
@@ -86,10 +101,10 @@ int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height) {
   return 1;
 }
 
-int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height) {
-  const WebPEncCSP uv_csp =
-      (WebPEncCSP)((int)picture->colorspace & WEBP_CSP_UV_MASK);
+int WebPPictureAllocYUVA(WebPPicture* const picture) {
   const int has_alpha = (int)picture->colorspace & WEBP_CSP_ALPHA_BIT;
+  const int width = picture->width;
+  const int height = picture->height;
   const int y_stride = width;
   const int uv_width = (int)(((int64_t)width + 1) >> 1);
   const int uv_height = (int)(((int64_t)height + 1) >> 1);
@@ -98,15 +113,11 @@ int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height) {
   uint64_t y_size, uv_size, a_size, total_size;
   uint8_t* mem;
 
-  assert(picture != NULL);
+  if (!WebPValidatePicture(picture)) return 0;
 
   WebPSafeFree(picture->memory_);
   WebPPictureResetBufferYUVA(picture);
 
-  if (uv_csp != WEBP_YUV420) {
-    return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION);
-  }
-
   // alpha
   a_width = has_alpha ? width : 0;
   a_stride = a_width;
@@ -152,15 +163,12 @@ int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height) {
 
 int WebPPictureAlloc(WebPPicture* picture) {
   if (picture != NULL) {
-    const int width = picture->width;
-    const int height = picture->height;
-
     WebPPictureFree(picture);   // erase previous buffer
 
     if (!picture->use_argb) {
-      return WebPPictureAllocYUVA(picture, width, height);
+      return WebPPictureAllocYUVA(picture);
     } else {
-      return WebPPictureAllocARGB(picture, width, height);
+      return WebPPictureAllocARGB(picture);
     }
   }
   return 1;
diff --git a/thirdparty/libwebp/src/enc/picture_rescale_enc.c b/thirdparty/libwebp/src/enc/picture_rescale_enc.c
index a75f5d9c06..839f91cacc 100644
--- a/thirdparty/libwebp/src/enc/picture_rescale_enc.c
+++ b/thirdparty/libwebp/src/enc/picture_rescale_enc.c
@@ -13,14 +13,15 @@
 
 #include "src/webp/encode.h"
 
-#if !defined(WEBP_REDUCE_SIZE)
-
 #include <assert.h>
 #include <stdlib.h>
 
 #include "src/enc/vp8i_enc.h"
+
+#if !defined(WEBP_REDUCE_SIZE)
 #include "src/utils/rescaler_utils.h"
 #include "src/utils/utils.h"
+#endif  // !defined(WEBP_REDUCE_SIZE)
 
 #define HALVE(x) (((x) + 1) >> 1)
 
@@ -56,6 +57,7 @@ static int AdjustAndCheckRectangle(const WebPPicture* const pic,
   return 1;
 }
 
+#if !defined(WEBP_REDUCE_SIZE)
 int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst) {
   if (src == NULL || dst == NULL) return 0;
   if (src == dst) return 1;
@@ -81,6 +83,7 @@ int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst) {
   }
   return 1;
 }
+#endif  // !defined(WEBP_REDUCE_SIZE)
 
 int WebPPictureIsView(const WebPPicture* picture) {
   if (picture == NULL) return 0;
@@ -120,6 +123,7 @@ int WebPPictureView(const WebPPicture* src,
   return 1;
 }
 
+#if !defined(WEBP_REDUCE_SIZE)
 //------------------------------------------------------------------------------
 // Picture cropping
 
@@ -198,34 +202,34 @@ static void AlphaMultiplyY(WebPPicture* const pic, int inverse) {
   }
 }
 
-int WebPPictureRescale(WebPPicture* pic, int width, int height) {
+int WebPPictureRescale(WebPPicture* picture, int width, int height) {
   WebPPicture tmp;
   int prev_width, prev_height;
   rescaler_t* work;
 
-  if (pic == NULL) return 0;
-  prev_width = pic->width;
-  prev_height = pic->height;
+  if (picture == NULL) return 0;
+  prev_width = picture->width;
+  prev_height = picture->height;
   if (!WebPRescalerGetScaledDimensions(
           prev_width, prev_height, &width, &height)) {
     return 0;
   }
 
-  PictureGrabSpecs(pic, &tmp);
+  PictureGrabSpecs(picture, &tmp);
   tmp.width = width;
   tmp.height = height;
   if (!WebPPictureAlloc(&tmp)) return 0;
 
-  if (!pic->use_argb) {
+  if (!picture->use_argb) {
     work = (rescaler_t*)WebPSafeMalloc(2ULL * width, sizeof(*work));
     if (work == NULL) {
       WebPPictureFree(&tmp);
       return 0;
     }
     // If present, we need to rescale alpha first (for AlphaMultiplyY).
-    if (pic->a != NULL) {
+    if (picture->a != NULL) {
       WebPInitAlphaProcessing();
-      if (!RescalePlane(pic->a, prev_width, prev_height, pic->a_stride,
+      if (!RescalePlane(picture->a, prev_width, prev_height, picture->a_stride,
                         tmp.a, width, height, tmp.a_stride, work, 1)) {
         return 0;
       }
@@ -233,17 +237,15 @@ int WebPPictureRescale(WebPPicture* pic, int width, int height) {
 
     // We take transparency into account on the luma plane only. That's not
     // totally exact blending, but still is a good approximation.
-    AlphaMultiplyY(pic, 0);
-    if (!RescalePlane(pic->y, prev_width, prev_height, pic->y_stride,
+    AlphaMultiplyY(picture, 0);
+    if (!RescalePlane(picture->y, prev_width, prev_height, picture->y_stride,
                       tmp.y, width, height, tmp.y_stride, work, 1) ||
-        !RescalePlane(pic->u,
-                      HALVE(prev_width), HALVE(prev_height), pic->uv_stride,
-                      tmp.u,
-                      HALVE(width), HALVE(height), tmp.uv_stride, work, 1) ||
-        !RescalePlane(pic->v,
-                      HALVE(prev_width), HALVE(prev_height), pic->uv_stride,
-                      tmp.v,
-                      HALVE(width), HALVE(height), tmp.uv_stride, work, 1)) {
+        !RescalePlane(picture->u, HALVE(prev_width), HALVE(prev_height),
+                      picture->uv_stride, tmp.u, HALVE(width), HALVE(height),
+                      tmp.uv_stride, work, 1) ||
+        !RescalePlane(picture->v, HALVE(prev_width), HALVE(prev_height),
+                      picture->uv_stride, tmp.v, HALVE(width), HALVE(height),
+                      tmp.uv_stride, work, 1)) {
       return 0;
     }
     AlphaMultiplyY(&tmp, 1);
@@ -257,18 +259,17 @@ int WebPPictureRescale(WebPPicture* pic, int width, int height) {
     // weighting first (black-matting), scale the RGB values, and remove
     // the premultiplication afterward (while preserving the alpha channel).
     WebPInitAlphaProcessing();
-    AlphaMultiplyARGB(pic, 0);
-    if (!RescalePlane((const uint8_t*)pic->argb, prev_width, prev_height,
-                      pic->argb_stride * 4,
-                      (uint8_t*)tmp.argb, width, height,
-                      tmp.argb_stride * 4, work, 4)) {
+    AlphaMultiplyARGB(picture, 0);
+    if (!RescalePlane((const uint8_t*)picture->argb, prev_width, prev_height,
+                      picture->argb_stride * 4, (uint8_t*)tmp.argb, width,
+                      height, tmp.argb_stride * 4, work, 4)) {
       return 0;
     }
     AlphaMultiplyARGB(&tmp, 1);
   }
-  WebPPictureFree(pic);
+  WebPPictureFree(picture);
   WebPSafeFree(work);
-  *pic = tmp;
+  *picture = tmp;
   return 1;
 }
 
@@ -280,23 +281,6 @@ int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst) {
   return 0;
 }
 
-int WebPPictureIsView(const WebPPicture* picture) {
-  (void)picture;
-  return 0;
-}
-
-int WebPPictureView(const WebPPicture* src,
-                    int left, int top, int width, int height,
-                    WebPPicture* dst) {
-  (void)src;
-  (void)left;
-  (void)top;
-  (void)width;
-  (void)height;
-  (void)dst;
-  return 0;
-}
-
 int WebPPictureCrop(WebPPicture* pic,
                     int left, int top, int width, int height) {
   (void)pic;
diff --git a/thirdparty/libwebp/src/enc/picture_tools_enc.c b/thirdparty/libwebp/src/enc/picture_tools_enc.c
index 38cb01534a..147cc18608 100644
--- a/thirdparty/libwebp/src/enc/picture_tools_enc.c
+++ b/thirdparty/libwebp/src/enc/picture_tools_enc.c
@@ -190,27 +190,28 @@ static WEBP_INLINE uint32_t MakeARGB32(int r, int g, int b) {
   return (0xff000000u | (r << 16) | (g << 8) | b);
 }
 
-void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb) {
+void WebPBlendAlpha(WebPPicture* picture, uint32_t background_rgb) {
   const int red = (background_rgb >> 16) & 0xff;
   const int green = (background_rgb >> 8) & 0xff;
   const int blue = (background_rgb >> 0) & 0xff;
   int x, y;
-  if (pic == NULL) return;
-  if (!pic->use_argb) {
-    const int uv_width = (pic->width >> 1);  // omit last pixel during u/v loop
+  if (picture == NULL) return;
+  if (!picture->use_argb) {
+    // omit last pixel during u/v loop
+    const int uv_width = (picture->width >> 1);
     const int Y0 = VP8RGBToY(red, green, blue, YUV_HALF);
     // VP8RGBToU/V expects the u/v values summed over four pixels
     const int U0 = VP8RGBToU(4 * red, 4 * green, 4 * blue, 4 * YUV_HALF);
     const int V0 = VP8RGBToV(4 * red, 4 * green, 4 * blue, 4 * YUV_HALF);
-    const int has_alpha = pic->colorspace & WEBP_CSP_ALPHA_BIT;
-    uint8_t* y_ptr = pic->y;
-    uint8_t* u_ptr = pic->u;
-    uint8_t* v_ptr = pic->v;
-    uint8_t* a_ptr = pic->a;
+    const int has_alpha = picture->colorspace & WEBP_CSP_ALPHA_BIT;
+    uint8_t* y_ptr = picture->y;
+    uint8_t* u_ptr = picture->u;
+    uint8_t* v_ptr = picture->v;
+    uint8_t* a_ptr = picture->a;
     if (!has_alpha || a_ptr == NULL) return;    // nothing to do
-    for (y = 0; y < pic->height; ++y) {
+    for (y = 0; y < picture->height; ++y) {
       // Luma blending
-      for (x = 0; x < pic->width; ++x) {
+      for (x = 0; x < picture->width; ++x) {
         const uint8_t alpha = a_ptr[x];
         if (alpha < 0xff) {
           y_ptr[x] = BLEND(Y0, y_ptr[x], alpha);
@@ -219,7 +220,7 @@ void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb) {
       // Chroma blending every even line
       if ((y & 1) == 0) {
         uint8_t* const a_ptr2 =
-            (y + 1 == pic->height) ? a_ptr : a_ptr + pic->a_stride;
+            (y + 1 == picture->height) ? a_ptr : a_ptr + picture->a_stride;
         for (x = 0; x < uv_width; ++x) {
           // Average four alpha values into a single blending weight.
           // TODO(skal): might lead to visible contouring. Can we do better?
@@ -229,24 +230,24 @@ void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb) {
           u_ptr[x] = BLEND_10BIT(U0, u_ptr[x], alpha);
           v_ptr[x] = BLEND_10BIT(V0, v_ptr[x], alpha);
         }
-        if (pic->width & 1) {   // rightmost pixel
+        if (picture->width & 1) {  // rightmost pixel
           const uint32_t alpha = 2 * (a_ptr[2 * x + 0] + a_ptr2[2 * x + 0]);
           u_ptr[x] = BLEND_10BIT(U0, u_ptr[x], alpha);
           v_ptr[x] = BLEND_10BIT(V0, v_ptr[x], alpha);
         }
       } else {
-        u_ptr += pic->uv_stride;
-        v_ptr += pic->uv_stride;
+        u_ptr += picture->uv_stride;
+        v_ptr += picture->uv_stride;
       }
-      memset(a_ptr, 0xff, pic->width);  // reset alpha value to opaque
-      a_ptr += pic->a_stride;
-      y_ptr += pic->y_stride;
+      memset(a_ptr, 0xff, picture->width);  // reset alpha value to opaque
+      a_ptr += picture->a_stride;
+      y_ptr += picture->y_stride;
     }
   } else {
-    uint32_t* argb = pic->argb;
+    uint32_t* argb = picture->argb;
     const uint32_t background = MakeARGB32(red, green, blue);
-    for (y = 0; y < pic->height; ++y) {
-      for (x = 0; x < pic->width; ++x) {
+    for (y = 0; y < picture->height; ++y) {
+      for (x = 0; x < picture->width; ++x) {
         const int alpha = (argb[x] >> 24) & 0xff;
         if (alpha != 0xff) {
           if (alpha > 0) {
@@ -262,7 +263,7 @@ void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb) {
           }
         }
       }
-      argb += pic->argb_stride;
+      argb += picture->argb_stride;
     }
   }
 }
diff --git a/thirdparty/libwebp/src/enc/predictor_enc.c b/thirdparty/libwebp/src/enc/predictor_enc.c
index 2b5c767280..b3d44b59d5 100644
--- a/thirdparty/libwebp/src/enc/predictor_enc.c
+++ b/thirdparty/libwebp/src/enc/predictor_enc.c
@@ -16,6 +16,7 @@
 
 #include "src/dsp/lossless.h"
 #include "src/dsp/lossless_common.h"
+#include "src/enc/vp8i_enc.h"
 #include "src/enc/vp8li_enc.h"
 
 #define MAX_DIFF_COST (1e30f)
@@ -31,10 +32,10 @@ static WEBP_INLINE int GetMin(int a, int b) { return (a > b) ? b : a; }
 // Methods to calculate Entropy (Shannon).
 
 static float PredictionCostSpatial(const int counts[256], int weight_0,
-                                   double exp_val) {
+                                   float exp_val) {
   const int significant_symbols = 256 >> 4;
-  const double exp_decay_factor = 0.6;
-  double bits = weight_0 * counts[0];
+  const float exp_decay_factor = 0.6f;
+  float bits = (float)weight_0 * counts[0];
   int i;
   for (i = 1; i < significant_symbols; ++i) {
     bits += exp_val * (counts[i] + counts[256 - i]);
@@ -46,9 +47,9 @@ static float PredictionCostSpatial(const int counts[256], int weight_0,
 static float PredictionCostSpatialHistogram(const int accumulated[4][256],
                                             const int tile[4][256]) {
   int i;
-  double retval = 0;
+  float retval = 0.f;
   for (i = 0; i < 4; ++i) {
-    const double kExpValue = 0.94;
+    const float kExpValue = 0.94f;
     retval += PredictionCostSpatial(tile[i], 1, kExpValue);
     retval += VP8LCombinedShannonEntropy(tile[i], accumulated[i]);
   }
@@ -472,12 +473,15 @@ static void CopyImageWithPrediction(int width, int height,
 // with respect to predictions. If near_lossless_quality < 100, applies
 // near lossless processing, shaving off more bits of residuals for lower
 // qualities.
-void VP8LResidualImage(int width, int height, int bits, int low_effort,
-                       uint32_t* const argb, uint32_t* const argb_scratch,
-                       uint32_t* const image, int near_lossless_quality,
-                       int exact, int used_subtract_green) {
+int VP8LResidualImage(int width, int height, int bits, int low_effort,
+                      uint32_t* const argb, uint32_t* const argb_scratch,
+                      uint32_t* const image, int near_lossless_quality,
+                      int exact, int used_subtract_green,
+                      const WebPPicture* const pic, int percent_range,
+                      int* const percent) {
   const int tiles_per_row = VP8LSubSampleSize(width, bits);
   const int tiles_per_col = VP8LSubSampleSize(height, bits);
+  int percent_start = *percent;
   int tile_y;
   int histo[4][256];
   const int max_quantization = 1 << VP8LNearLosslessBits(near_lossless_quality);
@@ -491,17 +495,24 @@ void VP8LResidualImage(int width, int height, int bits, int low_effort,
     for (tile_y = 0; tile_y < tiles_per_col; ++tile_y) {
       int tile_x;
       for (tile_x = 0; tile_x < tiles_per_row; ++tile_x) {
-        const int pred = GetBestPredictorForTile(width, height, tile_x, tile_y,
-            bits, histo, argb_scratch, argb, max_quantization, exact,
-            used_subtract_green, image);
+        const int pred = GetBestPredictorForTile(
+            width, height, tile_x, tile_y, bits, histo, argb_scratch, argb,
+            max_quantization, exact, used_subtract_green, image);
         image[tile_y * tiles_per_row + tile_x] = ARGB_BLACK | (pred << 8);
       }
+
+      if (!WebPReportProgress(
+              pic, percent_start + percent_range * tile_y / tiles_per_col,
+              percent)) {
+        return 0;
+      }
     }
   }
 
   CopyImageWithPrediction(width, height, bits, image, argb_scratch, argb,
                           low_effort, max_quantization, exact,
                           used_subtract_green);
+  return WebPReportProgress(pic, percent_start + percent_range, percent);
 }
 
 //------------------------------------------------------------------------------
@@ -532,7 +543,7 @@ static float PredictionCostCrossColor(const int accumulated[256],
                                       const int counts[256]) {
   // Favor low entropy, locally and globally.
   // Favor small absolute values for PredictionCostSpatial
-  static const double kExpValue = 2.4;
+  static const float kExpValue = 2.4f;
   return VP8LCombinedShannonEntropy(counts, accumulated) +
          PredictionCostSpatial(counts, 3, kExpValue);
 }
@@ -714,11 +725,14 @@ static void CopyTileWithColorTransform(int xsize, int ysize,
   }
 }
 
-void VP8LColorSpaceTransform(int width, int height, int bits, int quality,
-                             uint32_t* const argb, uint32_t* image) {
+int VP8LColorSpaceTransform(int width, int height, int bits, int quality,
+                            uint32_t* const argb, uint32_t* image,
+                            const WebPPicture* const pic, int percent_range,
+                            int* const percent) {
   const int max_tile_size = 1 << bits;
   const int tile_xsize = VP8LSubSampleSize(width, bits);
   const int tile_ysize = VP8LSubSampleSize(height, bits);
+  int percent_start = *percent;
   int accumulated_red_histo[256] = { 0 };
   int accumulated_blue_histo[256] = { 0 };
   int tile_x, tile_y;
@@ -768,5 +782,11 @@ void VP8LColorSpaceTransform(int width, int height, int bits, int quality,
         }
       }
     }
+    if (!WebPReportProgress(
+            pic, percent_start + percent_range * tile_y / tile_ysize,
+            percent)) {
+      return 0;
+    }
   }
+  return 1;
 }
diff --git a/thirdparty/libwebp/src/enc/quant_enc.c b/thirdparty/libwebp/src/enc/quant_enc.c
index 6cede28ab4..6d8202d277 100644
--- a/thirdparty/libwebp/src/enc/quant_enc.c
+++ b/thirdparty/libwebp/src/enc/quant_enc.c
@@ -533,7 +533,8 @@ static void InitScore(VP8ModeScore* const rd) {
   rd->score = MAX_COST;
 }
 
-static void CopyScore(VP8ModeScore* const dst, const VP8ModeScore* const src) {
+static void CopyScore(VP8ModeScore* WEBP_RESTRICT const dst,
+                      const VP8ModeScore* WEBP_RESTRICT const src) {
   dst->D  = src->D;
   dst->SD = src->SD;
   dst->R  = src->R;
@@ -542,7 +543,8 @@ static void CopyScore(VP8ModeScore* const dst, const VP8ModeScore* const src) {
   dst->score = src->score;
 }
 
-static void AddScore(VP8ModeScore* const dst, const VP8ModeScore* const src) {
+static void AddScore(VP8ModeScore* WEBP_RESTRICT const dst,
+                     const VP8ModeScore* WEBP_RESTRICT const src) {
   dst->D  += src->D;
   dst->SD += src->SD;
   dst->R  += src->R;
@@ -588,10 +590,10 @@ static WEBP_INLINE score_t RDScoreTrellis(int lambda, score_t rate,
 // Coefficient type.
 enum { TYPE_I16_AC = 0, TYPE_I16_DC = 1, TYPE_CHROMA_A = 2, TYPE_I4_AC = 3 };
 
-static int TrellisQuantizeBlock(const VP8Encoder* const enc,
+static int TrellisQuantizeBlock(const VP8Encoder* WEBP_RESTRICT const enc,
                                 int16_t in[16], int16_t out[16],
                                 int ctx0, int coeff_type,
-                                const VP8Matrix* const mtx,
+                                const VP8Matrix* WEBP_RESTRICT const mtx,
                                 int lambda) {
   const ProbaArray* const probas = enc->proba_.coeffs_[coeff_type];
   CostArrayPtr const costs =
@@ -767,9 +769,9 @@ static int TrellisQuantizeBlock(const VP8Encoder* const enc,
 // all at once. Output is the reconstructed block in *yuv_out, and the
 // quantized levels in *levels.
 
-static int ReconstructIntra16(VP8EncIterator* const it,
-                              VP8ModeScore* const rd,
-                              uint8_t* const yuv_out,
+static int ReconstructIntra16(VP8EncIterator* WEBP_RESTRICT const it,
+                              VP8ModeScore* WEBP_RESTRICT const rd,
+                              uint8_t* WEBP_RESTRICT const yuv_out,
                               int mode) {
   const VP8Encoder* const enc = it->enc_;
   const uint8_t* const ref = it->yuv_p_ + VP8I16ModeOffsets[mode];
@@ -819,10 +821,10 @@ static int ReconstructIntra16(VP8EncIterator* const it,
   return nz;
 }
 
-static int ReconstructIntra4(VP8EncIterator* const it,
+static int ReconstructIntra4(VP8EncIterator* WEBP_RESTRICT const it,
                              int16_t levels[16],
-                             const uint8_t* const src,
-                             uint8_t* const yuv_out,
+                             const uint8_t* WEBP_RESTRICT const src,
+                             uint8_t* WEBP_RESTRICT const yuv_out,
                              int mode) {
   const VP8Encoder* const enc = it->enc_;
   const uint8_t* const ref = it->yuv_p_ + VP8I4ModeOffsets[mode];
@@ -855,7 +857,8 @@ static int ReconstructIntra4(VP8EncIterator* const it,
 
 // Quantize as usual, but also compute and return the quantization error.
 // Error is already divided by DSHIFT.
-static int QuantizeSingle(int16_t* const v, const VP8Matrix* const mtx) {
+static int QuantizeSingle(int16_t* WEBP_RESTRICT const v,
+                          const VP8Matrix* WEBP_RESTRICT const mtx) {
   int V = *v;
   const int sign = (V < 0);
   if (sign) V = -V;
@@ -869,9 +872,10 @@ static int QuantizeSingle(int16_t* const v, const VP8Matrix* const mtx) {
   return (sign ? -V : V) >> DSCALE;
 }
 
-static void CorrectDCValues(const VP8EncIterator* const it,
-                            const VP8Matrix* const mtx,
-                            int16_t tmp[][16], VP8ModeScore* const rd) {
+static void CorrectDCValues(const VP8EncIterator* WEBP_RESTRICT const it,
+                            const VP8Matrix* WEBP_RESTRICT const mtx,
+                            int16_t tmp[][16],
+                            VP8ModeScore* WEBP_RESTRICT const rd) {
   //         | top[0] | top[1]
   // --------+--------+---------
   // left[0] | tmp[0]   tmp[1]  <->   err0 err1
@@ -902,8 +906,8 @@ static void CorrectDCValues(const VP8EncIterator* const it,
   }
 }
 
-static void StoreDiffusionErrors(VP8EncIterator* const it,
-                                 const VP8ModeScore* const rd) {
+static void StoreDiffusionErrors(VP8EncIterator* WEBP_RESTRICT const it,
+                                 const VP8ModeScore* WEBP_RESTRICT const rd) {
   int ch;
   for (ch = 0; ch <= 1; ++ch) {
     int8_t* const top = it->top_derr_[it->x_][ch];
@@ -922,8 +926,9 @@ static void StoreDiffusionErrors(VP8EncIterator* const it,
 
 //------------------------------------------------------------------------------
 
-static int ReconstructUV(VP8EncIterator* const it, VP8ModeScore* const rd,
-                         uint8_t* const yuv_out, int mode) {
+static int ReconstructUV(VP8EncIterator* WEBP_RESTRICT const it,
+                         VP8ModeScore* WEBP_RESTRICT const rd,
+                         uint8_t* WEBP_RESTRICT const yuv_out, int mode) {
   const VP8Encoder* const enc = it->enc_;
   const uint8_t* const ref = it->yuv_p_ + VP8UVModeOffsets[mode];
   const uint8_t* const src = it->yuv_in_ + U_OFF_ENC;
@@ -994,7 +999,8 @@ static void SwapOut(VP8EncIterator* const it) {
   SwapPtr(&it->yuv_out_, &it->yuv_out2_);
 }
 
-static void PickBestIntra16(VP8EncIterator* const it, VP8ModeScore* rd) {
+static void PickBestIntra16(VP8EncIterator* WEBP_RESTRICT const it,
+                            VP8ModeScore* WEBP_RESTRICT rd) {
   const int kNumBlocks = 16;
   VP8SegmentInfo* const dqm = &it->enc_->dqm_[it->mb_->segment_];
   const int lambda = dqm->lambda_i16_;
@@ -1054,7 +1060,7 @@ static void PickBestIntra16(VP8EncIterator* const it, VP8ModeScore* rd) {
 //------------------------------------------------------------------------------
 
 // return the cost array corresponding to the surrounding prediction modes.
-static const uint16_t* GetCostModeI4(VP8EncIterator* const it,
+static const uint16_t* GetCostModeI4(VP8EncIterator* WEBP_RESTRICT const it,
                                      const uint8_t modes[16]) {
   const int preds_w = it->enc_->preds_w_;
   const int x = (it->i4_ & 3), y = it->i4_ >> 2;
@@ -1063,7 +1069,8 @@ static const uint16_t* GetCostModeI4(VP8EncIterator* const it,
   return VP8FixedCostsI4[top][left];
 }
 
-static int PickBestIntra4(VP8EncIterator* const it, VP8ModeScore* const rd) {
+static int PickBestIntra4(VP8EncIterator* WEBP_RESTRICT const it,
+                          VP8ModeScore* WEBP_RESTRICT const rd) {
   const VP8Encoder* const enc = it->enc_;
   const VP8SegmentInfo* const dqm = &enc->dqm_[it->mb_->segment_];
   const int lambda = dqm->lambda_i4_;
@@ -1159,7 +1166,8 @@ static int PickBestIntra4(VP8EncIterator* const it, VP8ModeScore* const rd) {
 
 //------------------------------------------------------------------------------
 
-static void PickBestUV(VP8EncIterator* const it, VP8ModeScore* const rd) {
+static void PickBestUV(VP8EncIterator* WEBP_RESTRICT const it,
+                       VP8ModeScore* WEBP_RESTRICT const rd) {
   const int kNumBlocks = 8;
   const VP8SegmentInfo* const dqm = &it->enc_->dqm_[it->mb_->segment_];
   const int lambda = dqm->lambda_uv_;
@@ -1211,7 +1219,8 @@ static void PickBestUV(VP8EncIterator* const it, VP8ModeScore* const rd) {
 //------------------------------------------------------------------------------
 // Final reconstruction and quantization.
 
-static void SimpleQuantize(VP8EncIterator* const it, VP8ModeScore* const rd) {
+static void SimpleQuantize(VP8EncIterator* WEBP_RESTRICT const it,
+                           VP8ModeScore* WEBP_RESTRICT const rd) {
   const VP8Encoder* const enc = it->enc_;
   const int is_i16 = (it->mb_->type_ == 1);
   int nz = 0;
@@ -1236,9 +1245,9 @@ static void SimpleQuantize(VP8EncIterator* const it, VP8ModeScore* const rd) {
 }
 
 // Refine intra16/intra4 sub-modes based on distortion only (not rate).
-static void RefineUsingDistortion(VP8EncIterator* const it,
+static void RefineUsingDistortion(VP8EncIterator* WEBP_RESTRICT const it,
                                   int try_both_modes, int refine_uv_mode,
-                                  VP8ModeScore* const rd) {
+                                  VP8ModeScore* WEBP_RESTRICT const rd) {
   score_t best_score = MAX_COST;
   int nz = 0;
   int mode;
@@ -1352,7 +1361,8 @@ static void RefineUsingDistortion(VP8EncIterator* const it,
 //------------------------------------------------------------------------------
 // Entry point
 
-int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd,
+int VP8Decimate(VP8EncIterator* WEBP_RESTRICT const it,
+                VP8ModeScore* WEBP_RESTRICT const rd,
                 VP8RDLevel rd_opt) {
   int is_skipped;
   const int method = it->enc_->method_;
diff --git a/thirdparty/libwebp/src/enc/vp8i_enc.h b/thirdparty/libwebp/src/enc/vp8i_enc.h
index b4bba08f27..71f76702ae 100644
--- a/thirdparty/libwebp/src/enc/vp8i_enc.h
+++ b/thirdparty/libwebp/src/enc/vp8i_enc.h
@@ -32,7 +32,7 @@ extern "C" {
 // version numbers
 #define ENC_MAJ_VERSION 1
 #define ENC_MIN_VERSION 2
-#define ENC_REV_VERSION 2
+#define ENC_REV_VERSION 4
 
 enum { MAX_LF_LEVELS = 64,       // Maximum loop filter level
        MAX_VARIABLE_LEVEL = 67,  // last (inclusive) level with variable cost
@@ -470,7 +470,8 @@ int VP8EncAnalyze(VP8Encoder* const enc);
 // Sets up segment's quantization values, base_quant_ and filter strengths.
 void VP8SetSegmentParams(VP8Encoder* const enc, float quality);
 // Pick best modes and fills the levels. Returns true if skipped.
-int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd,
+int VP8Decimate(VP8EncIterator* WEBP_RESTRICT const it,
+                VP8ModeScore* WEBP_RESTRICT const rd,
                 VP8RDLevel rd_opt);
 
   // in alpha.c
@@ -490,19 +491,24 @@ int VP8FilterStrengthFromDelta(int sharpness, int delta);
 
   // misc utils for picture_*.c:
 
+// Returns true if 'picture' is non-NULL and dimensions/colorspace are within
+// their valid ranges. If returning false, the 'error_code' in 'picture' is
+// updated.
+int WebPValidatePicture(const WebPPicture* const picture);
+
 // Remove reference to the ARGB/YUVA buffer (doesn't free anything).
 void WebPPictureResetBuffers(WebPPicture* const picture);
 
-// Allocates ARGB buffer of given dimension (previous one is always free'd).
-// Preserves the YUV(A) buffer. Returns false in case of error (invalid param,
-// out-of-memory).
-int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height);
+// Allocates ARGB buffer according to set width/height (previous one is
+// always free'd). Preserves the YUV(A) buffer. Returns false in case of error
+// (invalid param, out-of-memory).
+int WebPPictureAllocARGB(WebPPicture* const picture);
 
-// Allocates YUVA buffer of given dimension (previous one is always free'd).
-// Uses picture->csp to determine whether an alpha buffer is needed.
+// Allocates YUVA buffer according to set width/height (previous one is always
+// free'd). Uses picture->csp to determine whether an alpha buffer is needed.
 // Preserves the ARGB buffer.
 // Returns false in case of error (invalid param, out-of-memory).
-int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);
+int WebPPictureAllocYUVA(WebPPicture* const picture);
 
 // Replace samples that are fully transparent by 'color' to help compressibility
 // (no guarantee, though). Assumes pic->use_argb is true.
diff --git a/thirdparty/libwebp/src/enc/vp8l_enc.c b/thirdparty/libwebp/src/enc/vp8l_enc.c
index e330e716f1..2b345df610 100644
--- a/thirdparty/libwebp/src/enc/vp8l_enc.c
+++ b/thirdparty/libwebp/src/enc/vp8l_enc.c
@@ -15,15 +15,16 @@
 #include <assert.h>
 #include <stdlib.h>
 
+#include "src/dsp/lossless.h"
+#include "src/dsp/lossless_common.h"
 #include "src/enc/backward_references_enc.h"
 #include "src/enc/histogram_enc.h"
 #include "src/enc/vp8i_enc.h"
 #include "src/enc/vp8li_enc.h"
-#include "src/dsp/lossless.h"
-#include "src/dsp/lossless_common.h"
 #include "src/utils/bit_writer_utils.h"
 #include "src/utils/huffman_encode_utils.h"
 #include "src/utils/utils.h"
+#include "src/webp/encode.h"
 #include "src/webp/format_constants.h"
 
 // Maximum number of histogram images (sub-blocks).
@@ -183,10 +184,9 @@ static void CoOccurrenceFindMax(const uint32_t* const cooccurrence,
 }
 
 // Builds the cooccurrence matrix
-static WebPEncodingError CoOccurrenceBuild(const WebPPicture* const pic,
-                                           const uint32_t* const palette,
-                                           uint32_t num_colors,
-                                           uint32_t* cooccurrence) {
+static int CoOccurrenceBuild(const WebPPicture* const pic,
+                             const uint32_t* const palette, uint32_t num_colors,
+                             uint32_t* cooccurrence) {
   uint32_t *lines, *line_top, *line_current, *line_tmp;
   int x, y;
   const uint32_t* src = pic->argb;
@@ -195,7 +195,10 @@ static WebPEncodingError CoOccurrenceBuild(const WebPPicture* const pic,
   uint32_t idx_map[MAX_PALETTE_SIZE] = {0};
   uint32_t palette_sorted[MAX_PALETTE_SIZE];
   lines = (uint32_t*)WebPSafeMalloc(2 * pic->width, sizeof(*lines));
-  if (lines == NULL) return VP8_ENC_ERROR_OUT_OF_MEMORY;
+  if (lines == NULL) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    return 0;
+  }
   line_top = &lines[0];
   line_current = &lines[pic->width];
   PrepareMapToPalette(palette, num_colors, palette_sorted, idx_map);
@@ -226,7 +229,7 @@ static WebPEncodingError CoOccurrenceBuild(const WebPPicture* const pic,
     src += pic->argb_stride;
   }
   WebPSafeFree(lines);
-  return VP8_ENC_OK;
+  return 1;
 }
 
 struct Sum {
@@ -237,7 +240,7 @@ struct Sum {
 // Implements the modified Zeng method from "A Survey on Palette Reordering
 // Methods for Improving the Compression of Color-Indexed Images" by Armando J.
 // Pinho and Antonio J. R. Neves.
-static WebPEncodingError PaletteSortModifiedZeng(
+static int PaletteSortModifiedZeng(
     const WebPPicture* const pic, const uint32_t* const palette_sorted,
     uint32_t num_colors, uint32_t* const palette) {
   uint32_t i, j, ind;
@@ -247,15 +250,16 @@ static WebPEncodingError PaletteSortModifiedZeng(
   uint32_t first, last;
   uint32_t num_sums;
   // TODO(vrabaud) check whether one color images should use palette or not.
-  if (num_colors <= 1) return VP8_ENC_OK;
+  if (num_colors <= 1) return 1;
   // Build the co-occurrence matrix.
   cooccurrence =
       (uint32_t*)WebPSafeCalloc(num_colors * num_colors, sizeof(*cooccurrence));
-  if (cooccurrence == NULL) return VP8_ENC_ERROR_OUT_OF_MEMORY;
-  if (CoOccurrenceBuild(pic, palette_sorted, num_colors, cooccurrence) !=
-      VP8_ENC_OK) {
-    WebPSafeFree(cooccurrence);
-    return VP8_ENC_ERROR_OUT_OF_MEMORY;
+  if (cooccurrence == NULL) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    return 0;
+  }
+  if (!CoOccurrenceBuild(pic, palette_sorted, num_colors, cooccurrence)) {
+    return 0;
   }
 
   // Initialize the mapping list with the two best indices.
@@ -316,7 +320,7 @@ static WebPEncodingError PaletteSortModifiedZeng(
   for (i = 0; i < num_colors; ++i) {
     palette[i] = palette_sorted[remapping[(first + i) % num_colors]];
   }
-  return VP8_ENC_OK;
+  return 1;
 }
 
 // -----------------------------------------------------------------------------
@@ -434,8 +438,8 @@ static int AnalyzeEntropy(const uint32_t* argb,
       curr_row += argb_stride;
     }
     {
-      double entropy_comp[kHistoTotal];
-      double entropy[kNumEntropyIx];
+      float entropy_comp[kHistoTotal];
+      float entropy[kNumEntropyIx];
       int k;
       int last_mode_to_analyze = use_palette ? kPalette : kSpatialSubGreen;
       int j;
@@ -949,11 +953,11 @@ static WEBP_INLINE void WriteHuffmanCodeWithExtraBits(
   VP8LPutBits(bw, (bits << depth) | symbol, depth + n_bits);
 }
 
-static WebPEncodingError StoreImageToBitMask(
+static int StoreImageToBitMask(
     VP8LBitWriter* const bw, int width, int histo_bits,
     const VP8LBackwardRefs* const refs,
     const uint16_t* histogram_symbols,
-    const HuffmanTreeCode* const huffman_codes) {
+    const HuffmanTreeCode* const huffman_codes, const WebPPicture* const pic) {
   const int histo_xsize = histo_bits ? VP8LSubSampleSize(width, histo_bits) : 1;
   const int tile_mask = (histo_bits == 0) ? 0 : -(1 << histo_bits);
   // x and y trace the position in the image.
@@ -1006,44 +1010,53 @@ static WebPEncodingError StoreImageToBitMask(
     }
     VP8LRefsCursorNext(&c);
   }
-  return bw->error_ ? VP8_ENC_ERROR_OUT_OF_MEMORY : VP8_ENC_OK;
+  if (bw->error_) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    return 0;
+  }
+  return 1;
 }
 
-// Special case of EncodeImageInternal() for cache-bits=0, histo_bits=31
-static WebPEncodingError EncodeImageNoHuffman(
-    VP8LBitWriter* const bw, const uint32_t* const argb,
-    VP8LHashChain* const hash_chain, VP8LBackwardRefs* const refs_array,
-    int width, int height, int quality, int low_effort) {
+// Special case of EncodeImageInternal() for cache-bits=0, histo_bits=31.
+// pic and percent are for progress.
+static int EncodeImageNoHuffman(VP8LBitWriter* const bw,
+                                const uint32_t* const argb,
+                                VP8LHashChain* const hash_chain,
+                                VP8LBackwardRefs* const refs_array, int width,
+                                int height, int quality, int low_effort,
+                                const WebPPicture* const pic, int percent_range,
+                                int* const percent) {
   int i;
   int max_tokens = 0;
-  WebPEncodingError err = VP8_ENC_OK;
   VP8LBackwardRefs* refs;
   HuffmanTreeToken* tokens = NULL;
-  HuffmanTreeCode huffman_codes[5] = { { 0, NULL, NULL } };
-  const uint16_t histogram_symbols[1] = { 0 };    // only one tree, one symbol
+  HuffmanTreeCode huffman_codes[5] = {{0, NULL, NULL}};
+  const uint16_t histogram_symbols[1] = {0};  // only one tree, one symbol
   int cache_bits = 0;
   VP8LHistogramSet* histogram_image = NULL;
   HuffmanTree* const huff_tree = (HuffmanTree*)WebPSafeMalloc(
-        3ULL * CODE_LENGTH_CODES, sizeof(*huff_tree));
+      3ULL * CODE_LENGTH_CODES, sizeof(*huff_tree));
   if (huff_tree == NULL) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
   // Calculate backward references from ARGB image.
-  if (!VP8LHashChainFill(hash_chain, quality, argb, width, height,
-                         low_effort)) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+  if (!VP8LHashChainFill(hash_chain, quality, argb, width, height, low_effort,
+                         pic, percent_range / 2, percent)) {
+    goto Error;
+  }
+  if (!VP8LGetBackwardReferences(width, height, argb, quality, /*low_effort=*/0,
+                                 kLZ77Standard | kLZ77RLE, cache_bits,
+                                 /*do_no_cache=*/0, hash_chain, refs_array,
+                                 &cache_bits, pic,
+                                 percent_range - percent_range / 2, percent)) {
     goto Error;
   }
-  err = VP8LGetBackwardReferences(
-      width, height, argb, quality, /*low_effort=*/0, kLZ77Standard | kLZ77RLE,
-      cache_bits, /*do_no_cache=*/0, hash_chain, refs_array, &cache_bits);
-  if (err != VP8_ENC_OK) goto Error;
   refs = &refs_array[0];
   histogram_image = VP8LAllocateHistogramSet(1, cache_bits);
   if (histogram_image == NULL) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
   VP8LHistogramSetClear(histogram_image);
@@ -1054,7 +1067,7 @@ static WebPEncodingError EncodeImageNoHuffman(
   // Create Huffman bit lengths and codes for each histogram image.
   assert(histogram_image->size == 1);
   if (!GetHuffBitLengthsAndCodes(histogram_image, huffman_codes)) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
@@ -1071,7 +1084,7 @@ static WebPEncodingError EncodeImageNoHuffman(
 
   tokens = (HuffmanTreeToken*)WebPSafeMalloc(max_tokens, sizeof(*tokens));
   if (tokens == NULL) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
@@ -1083,27 +1096,32 @@ static WebPEncodingError EncodeImageNoHuffman(
   }
 
   // Store actual literals.
-  err = StoreImageToBitMask(bw, width, 0, refs, histogram_symbols,
-                            huffman_codes);
+  if (!StoreImageToBitMask(bw, width, 0, refs, histogram_symbols, huffman_codes,
+                           pic)) {
+    goto Error;
+  }
 
  Error:
   WebPSafeFree(tokens);
   WebPSafeFree(huff_tree);
   VP8LFreeHistogramSet(histogram_image);
   WebPSafeFree(huffman_codes[0].codes);
-  return err;
+  return (pic->error_code == VP8_ENC_OK);
 }
 
-static WebPEncodingError EncodeImageInternal(
+// pic and percent are for progress.
+static int EncodeImageInternal(
     VP8LBitWriter* const bw, const uint32_t* const argb,
     VP8LHashChain* const hash_chain, VP8LBackwardRefs refs_array[4], int width,
     int height, int quality, int low_effort, int use_cache,
     const CrunchConfig* const config, int* cache_bits, int histogram_bits,
-    size_t init_byte_position, int* const hdr_size, int* const data_size) {
-  WebPEncodingError err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    size_t init_byte_position, int* const hdr_size, int* const data_size,
+    const WebPPicture* const pic, int percent_range, int* const percent) {
   const uint32_t histogram_image_xysize =
       VP8LSubSampleSize(width, histogram_bits) *
       VP8LSubSampleSize(height, histogram_bits);
+  int remaining_percent = percent_range;
+  int percent_start = *percent;
   VP8LHistogramSet* histogram_image = NULL;
   VP8LHistogram* tmp_histo = NULL;
   int histogram_image_size = 0;
@@ -1112,9 +1130,8 @@ static WebPEncodingError EncodeImageInternal(
       3ULL * CODE_LENGTH_CODES, sizeof(*huff_tree));
   HuffmanTreeToken* tokens = NULL;
   HuffmanTreeCode* huffman_codes = NULL;
-  uint16_t* const histogram_symbols =
-      (uint16_t*)WebPSafeMalloc(histogram_image_xysize,
-                                sizeof(*histogram_symbols));
+  uint16_t* const histogram_symbols = (uint16_t*)WebPSafeMalloc(
+      histogram_image_xysize, sizeof(*histogram_symbols));
   int sub_configs_idx;
   int cache_bits_init, write_histogram_image;
   VP8LBitWriter bw_init = *bw, bw_best;
@@ -1126,14 +1143,27 @@ static WebPEncodingError EncodeImageInternal(
   assert(hdr_size != NULL);
   assert(data_size != NULL);
 
-  // Make sure we can allocate the different objects.
   memset(&hash_chain_histogram, 0, sizeof(hash_chain_histogram));
+  if (!VP8LBitWriterInit(&bw_best, 0)) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    goto Error;
+  }
+
+  // Make sure we can allocate the different objects.
   if (huff_tree == NULL || histogram_symbols == NULL ||
-      !VP8LHashChainInit(&hash_chain_histogram, histogram_image_xysize) ||
-      !VP8LHashChainFill(hash_chain, quality, argb, width, height,
-                         low_effort)) {
+      !VP8LHashChainInit(&hash_chain_histogram, histogram_image_xysize)) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    goto Error;
+  }
+
+  percent_range = remaining_percent / 5;
+  if (!VP8LHashChainFill(hash_chain, quality, argb, width, height,
+                         low_effort, pic, percent_range, percent)) {
     goto Error;
   }
+  percent_start += percent_range;
+  remaining_percent -= percent_range;
+
   if (use_cache) {
     // If the value is different from zero, it has been set during the
     // palette analysis.
@@ -1142,22 +1172,27 @@ static WebPEncodingError EncodeImageInternal(
     cache_bits_init = 0;
   }
   // If several iterations will happen, clone into bw_best.
-  if (!VP8LBitWriterInit(&bw_best, 0) ||
-      ((config->sub_configs_size_ > 1 ||
-        config->sub_configs_[0].do_no_cache_) &&
-       !VP8LBitWriterClone(bw, &bw_best))) {
+  if ((config->sub_configs_size_ > 1 || config->sub_configs_[0].do_no_cache_) &&
+      !VP8LBitWriterClone(bw, &bw_best)) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
+
   for (sub_configs_idx = 0; sub_configs_idx < config->sub_configs_size_;
        ++sub_configs_idx) {
     const CrunchSubConfig* const sub_config =
         &config->sub_configs_[sub_configs_idx];
     int cache_bits_best, i_cache;
-    err = VP8LGetBackwardReferences(width, height, argb, quality, low_effort,
-                                    sub_config->lz77_, cache_bits_init,
-                                    sub_config->do_no_cache_, hash_chain,
-                                    &refs_array[0], &cache_bits_best);
-    if (err != VP8_ENC_OK) goto Error;
+    int i_remaining_percent = remaining_percent / config->sub_configs_size_;
+    int i_percent_range = i_remaining_percent / 4;
+    i_remaining_percent -= i_percent_range;
+
+    if (!VP8LGetBackwardReferences(
+            width, height, argb, quality, low_effort, sub_config->lz77_,
+            cache_bits_init, sub_config->do_no_cache_, hash_chain,
+            &refs_array[0], &cache_bits_best, pic, i_percent_range, percent)) {
+      goto Error;
+    }
 
     for (i_cache = 0; i_cache < (sub_config->do_no_cache_ ? 2 : 1); ++i_cache) {
       const int cache_bits_tmp = (i_cache == 0) ? cache_bits_best : 0;
@@ -1172,11 +1207,17 @@ static WebPEncodingError EncodeImageInternal(
       histogram_image =
           VP8LAllocateHistogramSet(histogram_image_xysize, cache_bits_tmp);
       tmp_histo = VP8LAllocateHistogram(cache_bits_tmp);
-      if (histogram_image == NULL || tmp_histo == NULL ||
-          !VP8LGetHistoImageSymbols(width, height, &refs_array[i_cache],
-                                    quality, low_effort, histogram_bits,
-                                    cache_bits_tmp, histogram_image, tmp_histo,
-                                    histogram_symbols)) {
+      if (histogram_image == NULL || tmp_histo == NULL) {
+        WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+        goto Error;
+      }
+
+      i_percent_range = i_remaining_percent / 3;
+      i_remaining_percent -= i_percent_range;
+      if (!VP8LGetHistoImageSymbols(
+              width, height, &refs_array[i_cache], quality, low_effort,
+              histogram_bits, cache_bits_tmp, histogram_image, tmp_histo,
+              histogram_symbols, pic, i_percent_range, percent)) {
         goto Error;
       }
       // Create Huffman bit lengths and codes for each histogram image.
@@ -1189,6 +1230,7 @@ static WebPEncodingError EncodeImageInternal(
       // GetHuffBitLengthsAndCodes().
       if (huffman_codes == NULL ||
           !GetHuffBitLengthsAndCodes(histogram_image, huffman_codes)) {
+        WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
         goto Error;
       }
       // Free combined histograms.
@@ -1211,12 +1253,14 @@ static WebPEncodingError EncodeImageInternal(
       write_histogram_image = (histogram_image_size > 1);
       VP8LPutBits(bw, write_histogram_image, 1);
       if (write_histogram_image) {
-        uint32_t* const histogram_argb =
-            (uint32_t*)WebPSafeMalloc(histogram_image_xysize,
-                                      sizeof(*histogram_argb));
+        uint32_t* const histogram_argb = (uint32_t*)WebPSafeMalloc(
+            histogram_image_xysize, sizeof(*histogram_argb));
         int max_index = 0;
         uint32_t i;
-        if (histogram_argb == NULL) goto Error;
+        if (histogram_argb == NULL) {
+          WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+          goto Error;
+        }
         for (i = 0; i < histogram_image_xysize; ++i) {
           const int symbol_index = histogram_symbols[i] & 0xffff;
           histogram_argb[i] = (symbol_index << 8);
@@ -1227,12 +1271,17 @@ static WebPEncodingError EncodeImageInternal(
         histogram_image_size = max_index;
 
         VP8LPutBits(bw, histogram_bits - 2, 3);
-        err = EncodeImageNoHuffman(
-            bw, histogram_argb, &hash_chain_histogram, &refs_array[2],
-            VP8LSubSampleSize(width, histogram_bits),
-            VP8LSubSampleSize(height, histogram_bits), quality, low_effort);
+        i_percent_range = i_remaining_percent / 2;
+        i_remaining_percent -= i_percent_range;
+        if (!EncodeImageNoHuffman(
+                bw, histogram_argb, &hash_chain_histogram, &refs_array[2],
+                VP8LSubSampleSize(width, histogram_bits),
+                VP8LSubSampleSize(height, histogram_bits), quality, low_effort,
+                pic, i_percent_range, percent)) {
+          WebPSafeFree(histogram_argb);
+          goto Error;
+        }
         WebPSafeFree(histogram_argb);
-        if (err != VP8_ENC_OK) goto Error;
       }
 
       // Store Huffman codes.
@@ -1256,9 +1305,10 @@ static WebPEncodingError EncodeImageInternal(
       }
       // Store actual literals.
       hdr_size_tmp = (int)(VP8LBitWriterNumBytes(bw) - init_byte_position);
-      err = StoreImageToBitMask(bw, width, histogram_bits, &refs_array[i_cache],
-                                histogram_symbols, huffman_codes);
-      if (err != VP8_ENC_OK) goto Error;
+      if (!StoreImageToBitMask(bw, width, histogram_bits, &refs_array[i_cache],
+                               histogram_symbols, huffman_codes, pic)) {
+        goto Error;
+      }
       // Keep track of the smallest image so far.
       if (VP8LBitWriterNumBytes(bw) < bw_size_best) {
         bw_size_best = VP8LBitWriterNumBytes(bw);
@@ -1278,7 +1328,10 @@ static WebPEncodingError EncodeImageInternal(
     }
   }
   VP8LBitWriterSwap(bw, &bw_best);
-  err = VP8_ENC_OK;
+
+  if (!WebPReportProgress(pic, percent_start + remaining_percent, percent)) {
+    goto Error;
+  }
 
  Error:
   WebPSafeFree(tokens);
@@ -1292,7 +1345,7 @@ static WebPEncodingError EncodeImageInternal(
   }
   WebPSafeFree(histogram_symbols);
   VP8LBitWriterWipeOut(&bw_best);
-  return err;
+  return (pic->error_code == VP8_ENC_OK);
 }
 
 // -----------------------------------------------------------------------------
@@ -1305,22 +1358,23 @@ static void ApplySubtractGreen(VP8LEncoder* const enc, int width, int height,
   VP8LSubtractGreenFromBlueAndRed(enc->argb_, width * height);
 }
 
-static WebPEncodingError ApplyPredictFilter(const VP8LEncoder* const enc,
-                                            int width, int height,
-                                            int quality, int low_effort,
-                                            int used_subtract_green,
-                                            VP8LBitWriter* const bw) {
+static int ApplyPredictFilter(const VP8LEncoder* const enc, int width,
+                              int height, int quality, int low_effort,
+                              int used_subtract_green, VP8LBitWriter* const bw,
+                              int percent_range, int* const percent) {
   const int pred_bits = enc->transform_bits_;
   const int transform_width = VP8LSubSampleSize(width, pred_bits);
   const int transform_height = VP8LSubSampleSize(height, pred_bits);
   // we disable near-lossless quantization if palette is used.
-  const int near_lossless_strength = enc->use_palette_ ? 100
-                                   : enc->config_->near_lossless;
+  const int near_lossless_strength =
+      enc->use_palette_ ? 100 : enc->config_->near_lossless;
 
-  VP8LResidualImage(width, height, pred_bits, low_effort, enc->argb_,
-                    enc->argb_scratch_, enc->transform_data_,
-                    near_lossless_strength, enc->config_->exact,
-                    used_subtract_green);
+  if (!VP8LResidualImage(
+          width, height, pred_bits, low_effort, enc->argb_, enc->argb_scratch_,
+          enc->transform_data_, near_lossless_strength, enc->config_->exact,
+          used_subtract_green, enc->pic_, percent_range / 2, percent)) {
+    return 0;
+  }
   VP8LPutBits(bw, TRANSFORM_PRESENT, 1);
   VP8LPutBits(bw, PREDICTOR_TRANSFORM, 2);
   assert(pred_bits >= 2);
@@ -1328,19 +1382,23 @@ static WebPEncodingError ApplyPredictFilter(const VP8LEncoder* const enc,
   return EncodeImageNoHuffman(
       bw, enc->transform_data_, (VP8LHashChain*)&enc->hash_chain_,
       (VP8LBackwardRefs*)&enc->refs_[0], transform_width, transform_height,
-      quality, low_effort);
+      quality, low_effort, enc->pic_, percent_range - percent_range / 2,
+      percent);
 }
 
-static WebPEncodingError ApplyCrossColorFilter(const VP8LEncoder* const enc,
-                                               int width, int height,
-                                               int quality, int low_effort,
-                                               VP8LBitWriter* const bw) {
+static int ApplyCrossColorFilter(const VP8LEncoder* const enc, int width,
+                                 int height, int quality, int low_effort,
+                                 VP8LBitWriter* const bw, int percent_range,
+                                 int* const percent) {
   const int ccolor_transform_bits = enc->transform_bits_;
   const int transform_width = VP8LSubSampleSize(width, ccolor_transform_bits);
   const int transform_height = VP8LSubSampleSize(height, ccolor_transform_bits);
 
-  VP8LColorSpaceTransform(width, height, ccolor_transform_bits, quality,
-                          enc->argb_, enc->transform_data_);
+  if (!VP8LColorSpaceTransform(width, height, ccolor_transform_bits, quality,
+                               enc->argb_, enc->transform_data_, enc->pic_,
+                               percent_range / 2, percent)) {
+    return 0;
+  }
   VP8LPutBits(bw, TRANSFORM_PRESENT, 1);
   VP8LPutBits(bw, CROSS_COLOR_TRANSFORM, 2);
   assert(ccolor_transform_bits >= 2);
@@ -1348,23 +1406,21 @@ static WebPEncodingError ApplyCrossColorFilter(const VP8LEncoder* const enc,
   return EncodeImageNoHuffman(
       bw, enc->transform_data_, (VP8LHashChain*)&enc->hash_chain_,
       (VP8LBackwardRefs*)&enc->refs_[0], transform_width, transform_height,
-      quality, low_effort);
+      quality, low_effort, enc->pic_, percent_range - percent_range / 2,
+      percent);
 }
 
 // -----------------------------------------------------------------------------
 
-static WebPEncodingError WriteRiffHeader(const WebPPicture* const pic,
-                                         size_t riff_size, size_t vp8l_size) {
+static int WriteRiffHeader(const WebPPicture* const pic, size_t riff_size,
+                           size_t vp8l_size) {
   uint8_t riff[RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE + VP8L_SIGNATURE_SIZE] = {
     'R', 'I', 'F', 'F', 0, 0, 0, 0, 'W', 'E', 'B', 'P',
     'V', 'P', '8', 'L', 0, 0, 0, 0, VP8L_MAGIC_BYTE,
   };
   PutLE32(riff + TAG_SIZE, (uint32_t)riff_size);
   PutLE32(riff + RIFF_HEADER_SIZE + TAG_SIZE, (uint32_t)vp8l_size);
-  if (!pic->writer(riff, sizeof(riff), pic)) {
-    return VP8_ENC_ERROR_BAD_WRITE;
-  }
-  return VP8_ENC_OK;
+  return pic->writer(riff, sizeof(riff), pic);
 }
 
 static int WriteImageSize(const WebPPicture* const pic,
@@ -1384,36 +1440,29 @@ static int WriteRealAlphaAndVersion(VP8LBitWriter* const bw, int has_alpha) {
   return !bw->error_;
 }
 
-static WebPEncodingError WriteImage(const WebPPicture* const pic,
-                                    VP8LBitWriter* const bw,
-                                    size_t* const coded_size) {
-  WebPEncodingError err = VP8_ENC_OK;
+static int WriteImage(const WebPPicture* const pic, VP8LBitWriter* const bw,
+                      size_t* const coded_size) {
   const uint8_t* const webpll_data = VP8LBitWriterFinish(bw);
   const size_t webpll_size = VP8LBitWriterNumBytes(bw);
   const size_t vp8l_size = VP8L_SIGNATURE_SIZE + webpll_size;
   const size_t pad = vp8l_size & 1;
   const size_t riff_size = TAG_SIZE + CHUNK_HEADER_SIZE + vp8l_size + pad;
 
-  err = WriteRiffHeader(pic, riff_size, vp8l_size);
-  if (err != VP8_ENC_OK) goto Error;
-
-  if (!pic->writer(webpll_data, webpll_size, pic)) {
-    err = VP8_ENC_ERROR_BAD_WRITE;
-    goto Error;
+  if (!WriteRiffHeader(pic, riff_size, vp8l_size) ||
+      !pic->writer(webpll_data, webpll_size, pic)) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_WRITE);
+    return 0;
   }
 
   if (pad) {
     const uint8_t pad_byte[1] = { 0 };
     if (!pic->writer(pad_byte, 1, pic)) {
-      err = VP8_ENC_ERROR_BAD_WRITE;
-      goto Error;
+      WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_WRITE);
+      return 0;
     }
   }
   *coded_size = CHUNK_HEADER_SIZE + riff_size;
-  return VP8_ENC_OK;
-
- Error:
-  return err;
+  return 1;
 }
 
 // -----------------------------------------------------------------------------
@@ -1429,18 +1478,16 @@ static void ClearTransformBuffer(VP8LEncoder* const enc) {
 // Flags influencing the memory allocated:
 //  enc->transform_bits_
 //  enc->use_predict_, enc->use_cross_color_
-static WebPEncodingError AllocateTransformBuffer(VP8LEncoder* const enc,
-                                                 int width, int height) {
-  WebPEncodingError err = VP8_ENC_OK;
+static int AllocateTransformBuffer(VP8LEncoder* const enc, int width,
+                                   int height) {
   const uint64_t image_size = width * height;
   // VP8LResidualImage needs room for 2 scanlines of uint32 pixels with an extra
   // pixel in each, plus 2 regular scanlines of bytes.
   // TODO(skal): Clean up by using arithmetic in bytes instead of words.
   const uint64_t argb_scratch_size =
-      enc->use_predict_
-          ? (width + 1) * 2 +
-            (width * 2 + sizeof(uint32_t) - 1) / sizeof(uint32_t)
-          : 0;
+      enc->use_predict_ ? (width + 1) * 2 + (width * 2 + sizeof(uint32_t) - 1) /
+                                                sizeof(uint32_t)
+                        : 0;
   const uint64_t transform_data_size =
       (enc->use_predict_ || enc->use_cross_color_)
           ? VP8LSubSampleSize(width, enc->transform_bits_) *
@@ -1448,17 +1495,16 @@ static WebPEncodingError AllocateTransformBuffer(VP8LEncoder* const enc,
           : 0;
   const uint64_t max_alignment_in_words =
       (WEBP_ALIGN_CST + sizeof(uint32_t) - 1) / sizeof(uint32_t);
-  const uint64_t mem_size =
-      image_size + max_alignment_in_words +
-      argb_scratch_size + max_alignment_in_words +
-      transform_data_size;
+  const uint64_t mem_size = image_size + max_alignment_in_words +
+                            argb_scratch_size + max_alignment_in_words +
+                            transform_data_size;
   uint32_t* mem = enc->transform_mem_;
   if (mem == NULL || mem_size > enc->transform_mem_size_) {
     ClearTransformBuffer(enc);
     mem = (uint32_t*)WebPSafeMalloc(mem_size, sizeof(*mem));
     if (mem == NULL) {
-      err = VP8_ENC_ERROR_OUT_OF_MEMORY;
-      goto Error;
+      WebPEncodingSetError(enc->pic_, VP8_ENC_ERROR_OUT_OF_MEMORY);
+      return 0;
     }
     enc->transform_mem_ = mem;
     enc->transform_mem_size_ = (size_t)mem_size;
@@ -1471,19 +1517,16 @@ static WebPEncodingError AllocateTransformBuffer(VP8LEncoder* const enc,
   enc->transform_data_ = mem;
 
   enc->current_width_ = width;
- Error:
-  return err;
+  return 1;
 }
 
-static WebPEncodingError MakeInputImageCopy(VP8LEncoder* const enc) {
-  WebPEncodingError err = VP8_ENC_OK;
+static int MakeInputImageCopy(VP8LEncoder* const enc) {
   const WebPPicture* const picture = enc->pic_;
   const int width = picture->width;
   const int height = picture->height;
 
-  err = AllocateTransformBuffer(enc, width, height);
-  if (err != VP8_ENC_OK) return err;
-  if (enc->argb_content_ == kEncoderARGB) return VP8_ENC_OK;
+  if (!AllocateTransformBuffer(enc, width, height)) return 0;
+  if (enc->argb_content_ == kEncoderARGB) return 1;
 
   {
     uint32_t* dst = enc->argb_;
@@ -1497,7 +1540,7 @@ static WebPEncodingError MakeInputImageCopy(VP8LEncoder* const enc) {
   }
   enc->argb_content_ = kEncoderARGB;
   assert(enc->current_width_ == width);
-  return VP8_ENC_OK;
+  return 1;
 }
 
 // -----------------------------------------------------------------------------
@@ -1559,16 +1602,19 @@ static WEBP_INLINE uint32_t ApplyPaletteHash2(uint32_t color) {
 // using 'row' as a temporary buffer of size 'width'.
 // We assume that all src[] values have a corresponding entry in the palette.
 // Note: src[] can be the same as dst[]
-static WebPEncodingError ApplyPalette(const uint32_t* src, uint32_t src_stride,
-                                      uint32_t* dst, uint32_t dst_stride,
-                                      const uint32_t* palette, int palette_size,
-                                      int width, int height, int xbits) {
+static int ApplyPalette(const uint32_t* src, uint32_t src_stride, uint32_t* dst,
+                        uint32_t dst_stride, const uint32_t* palette,
+                        int palette_size, int width, int height, int xbits,
+                        const WebPPicture* const pic) {
   // TODO(skal): this tmp buffer is not needed if VP8LBundleColorMap() can be
   // made to work in-place.
   uint8_t* const tmp_row = (uint8_t*)WebPSafeMalloc(width, sizeof(*tmp_row));
   int x, y;
 
-  if (tmp_row == NULL) return VP8_ENC_ERROR_OUT_OF_MEMORY;
+  if (tmp_row == NULL) {
+    WebPEncodingSetError(pic, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    return 0;
+  }
 
   if (palette_size < APPLY_PALETTE_GREEDY_MAX) {
     APPLY_PALETTE_FOR(SearchColorGreedy(palette, palette_size, pix));
@@ -1613,7 +1659,7 @@ static WebPEncodingError ApplyPalette(const uint32_t* src, uint32_t src_stride,
     }
   }
   WebPSafeFree(tmp_row);
-  return VP8_ENC_OK;
+  return 1;
 }
 #undef APPLY_PALETTE_FOR
 #undef PALETTE_INV_SIZE_BITS
@@ -1621,9 +1667,7 @@ static WebPEncodingError ApplyPalette(const uint32_t* src, uint32_t src_stride,
 #undef APPLY_PALETTE_GREEDY_MAX
 
 // Note: Expects "enc->palette_" to be set properly.
-static WebPEncodingError MapImageFromPalette(VP8LEncoder* const enc,
-                                             int in_place) {
-  WebPEncodingError err = VP8_ENC_OK;
+static int MapImageFromPalette(VP8LEncoder* const enc, int in_place) {
   const WebPPicture* const pic = enc->pic_;
   const int width = pic->width;
   const int height = pic->height;
@@ -1641,19 +1685,22 @@ static WebPEncodingError MapImageFromPalette(VP8LEncoder* const enc,
     xbits = (palette_size <= 16) ? 1 : 0;
   }
 
-  err = AllocateTransformBuffer(enc, VP8LSubSampleSize(width, xbits), height);
-  if (err != VP8_ENC_OK) return err;
-
-  err = ApplyPalette(src, src_stride,
+  if (!AllocateTransformBuffer(enc, VP8LSubSampleSize(width, xbits), height)) {
+    return 0;
+  }
+  if (!ApplyPalette(src, src_stride,
                      enc->argb_, enc->current_width_,
-                     palette, palette_size, width, height, xbits);
+                     palette, palette_size, width, height, xbits, pic)) {
+    return 0;
+  }
   enc->argb_content_ = kEncoderPalette;
-  return err;
+  return 1;
 }
 
 // Save palette_[] to bitstream.
 static WebPEncodingError EncodePalette(VP8LBitWriter* const bw, int low_effort,
-                                       VP8LEncoder* const enc) {
+                                       VP8LEncoder* const enc,
+                                       int percent_range, int* const percent) {
   int i;
   uint32_t tmp_palette[MAX_PALETTE_SIZE];
   const int palette_size = enc->palette_size_;
@@ -1668,7 +1715,7 @@ static WebPEncodingError EncodePalette(VP8LBitWriter* const bw, int low_effort,
   tmp_palette[0] = palette[0];
   return EncodeImageNoHuffman(bw, tmp_palette, &enc->hash_chain_,
                               &enc->refs_[0], palette_size, 1, /*quality=*/20,
-                              low_effort);
+                              low_effort, enc->pic_, percent_range, percent);
 }
 
 // -----------------------------------------------------------------------------
@@ -1712,7 +1759,6 @@ typedef struct {
   CrunchConfig crunch_configs_[CRUNCH_CONFIGS_MAX];
   int num_crunch_configs_;
   int red_and_blue_always_zero_;
-  WebPEncodingError err_;
   WebPAuxStats* stats_;
 } StreamEncodeContext;
 
@@ -1729,7 +1775,6 @@ static int EncodeStreamHook(void* input, void* data2) {
 #if !defined(WEBP_DISABLE_STATS)
   WebPAuxStats* const stats = params->stats_;
 #endif
-  WebPEncodingError err = VP8_ENC_OK;
   const int quality = (int)config->quality;
   const int low_effort = (config->method == 0);
 #if (WEBP_NEAR_LOSSLESS == 1)
@@ -1737,6 +1782,7 @@ static int EncodeStreamHook(void* input, void* data2) {
 #endif
   const int height = picture->height;
   const size_t byte_position = VP8LBitWriterNumBytes(bw);
+  int percent = 2;  // for WebPProgressHook
 #if (WEBP_NEAR_LOSSLESS == 1)
   int use_near_lossless = 0;
 #endif
@@ -1750,12 +1796,13 @@ static int EncodeStreamHook(void* input, void* data2) {
 
   if (!VP8LBitWriterInit(&bw_best, 0) ||
       (num_crunch_configs > 1 && !VP8LBitWriterClone(bw, &bw_best))) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
   for (idx = 0; idx < num_crunch_configs; ++idx) {
     const int entropy_idx = crunch_configs[idx].entropy_idx_;
+    int remaining_percent = 97 / num_crunch_configs, percent_range;
     enc->use_palette_ =
         (entropy_idx == kPalette) || (entropy_idx == kPaletteAndSpatial);
     enc->use_subtract_green_ =
@@ -1779,11 +1826,10 @@ static int EncodeStreamHook(void* input, void* data2) {
     use_near_lossless = (config->near_lossless < 100) && !enc->use_palette_ &&
                         !enc->use_predict_;
     if (use_near_lossless) {
-      err = AllocateTransformBuffer(enc, width, height);
-      if (err != VP8_ENC_OK) goto Error;
+      if (!AllocateTransformBuffer(enc, width, height)) goto Error;
       if ((enc->argb_content_ != kEncoderNearLossless) &&
           !VP8ApplyNearLossless(picture, config->near_lossless, enc->argb_)) {
-        err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+        WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
         goto Error;
       }
       enc->argb_content_ = kEncoderNearLossless;
@@ -1805,14 +1851,17 @@ static int EncodeStreamHook(void* input, void* data2) {
                                   enc->palette_);
       } else {
         assert(crunch_configs[idx].palette_sorting_type_ == kModifiedZeng);
-        err = PaletteSortModifiedZeng(enc->pic_, enc->palette_sorted_,
-                                      enc->palette_size_, enc->palette_);
-        if (err != VP8_ENC_OK) goto Error;
+        if (!PaletteSortModifiedZeng(enc->pic_, enc->palette_sorted_,
+                                      enc->palette_size_, enc->palette_)) {
+          goto Error;
+        }
       }
-      err = EncodePalette(bw, low_effort, enc);
-      if (err != VP8_ENC_OK) goto Error;
-      err = MapImageFromPalette(enc, use_delta_palette);
-      if (err != VP8_ENC_OK) goto Error;
+      percent_range = remaining_percent / 4;
+      if (!EncodePalette(bw, low_effort, enc, percent_range, &percent)) {
+        goto Error;
+      }
+      remaining_percent -= percent_range;
+      if (!MapImageFromPalette(enc, use_delta_palette)) goto Error;
       // If using a color cache, do not have it bigger than the number of
       // colors.
       if (use_cache && enc->palette_size_ < (1 << MAX_COLOR_CACHE_BITS)) {
@@ -1823,8 +1872,7 @@ static int EncodeStreamHook(void* input, void* data2) {
       // In case image is not packed.
       if (enc->argb_content_ != kEncoderNearLossless &&
           enc->argb_content_ != kEncoderPalette) {
-        err = MakeInputImageCopy(enc);
-        if (err != VP8_ENC_OK) goto Error;
+        if (!MakeInputImageCopy(enc)) goto Error;
       }
 
       // -----------------------------------------------------------------------
@@ -1835,15 +1883,22 @@ static int EncodeStreamHook(void* input, void* data2) {
       }
 
       if (enc->use_predict_) {
-        err = ApplyPredictFilter(enc, enc->current_width_, height, quality,
-                                 low_effort, enc->use_subtract_green_, bw);
-        if (err != VP8_ENC_OK) goto Error;
+        percent_range = remaining_percent / 3;
+        if (!ApplyPredictFilter(enc, enc->current_width_, height, quality,
+                                low_effort, enc->use_subtract_green_, bw,
+                                percent_range, &percent)) {
+          goto Error;
+        }
+        remaining_percent -= percent_range;
       }
 
       if (enc->use_cross_color_) {
-        err = ApplyCrossColorFilter(enc, enc->current_width_, height, quality,
-                                    low_effort, bw);
-        if (err != VP8_ENC_OK) goto Error;
+        percent_range = remaining_percent / 2;
+        if (!ApplyCrossColorFilter(enc, enc->current_width_, height, quality,
+                                   low_effort, bw, percent_range, &percent)) {
+          goto Error;
+        }
+        remaining_percent -= percent_range;
       }
     }
 
@@ -1851,12 +1906,13 @@ static int EncodeStreamHook(void* input, void* data2) {
 
     // -------------------------------------------------------------------------
     // Encode and write the transformed image.
-    err = EncodeImageInternal(bw, enc->argb_, &enc->hash_chain_, enc->refs_,
-                              enc->current_width_, height, quality, low_effort,
-                              use_cache, &crunch_configs[idx],
-                              &enc->cache_bits_, enc->histo_bits_,
-                              byte_position, &hdr_size, &data_size);
-    if (err != VP8_ENC_OK) goto Error;
+    if (!EncodeImageInternal(
+            bw, enc->argb_, &enc->hash_chain_, enc->refs_, enc->current_width_,
+            height, quality, low_effort, use_cache, &crunch_configs[idx],
+            &enc->cache_bits_, enc->histo_bits_, byte_position, &hdr_size,
+            &data_size, picture, remaining_percent, &percent)) {
+      goto Error;
+    }
 
     // If we are better than what we already have.
     if (VP8LBitWriterNumBytes(bw) < best_size) {
@@ -1886,18 +1942,15 @@ static int EncodeStreamHook(void* input, void* data2) {
   }
   VP8LBitWriterSwap(&bw_best, bw);
 
-Error:
+ Error:
   VP8LBitWriterWipeOut(&bw_best);
-  params->err_ = err;
   // The hook should return false in case of error.
-  return (err == VP8_ENC_OK);
+  return (params->picture_->error_code == VP8_ENC_OK);
 }
 
-WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
-                                   const WebPPicture* const picture,
-                                   VP8LBitWriter* const bw_main,
-                                   int use_cache) {
-  WebPEncodingError err = VP8_ENC_OK;
+int VP8LEncodeStream(const WebPConfig* const config,
+                     const WebPPicture* const picture,
+                     VP8LBitWriter* const bw_main, int use_cache) {
   VP8LEncoder* const enc_main = VP8LEncoderNew(config, picture);
   VP8LEncoder* enc_side = NULL;
   CrunchConfig crunch_configs[CRUNCH_CONFIGS_MAX];
@@ -1909,15 +1962,24 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
   // The main thread uses picture->stats, the side thread uses stats_side.
   WebPAuxStats stats_side;
   VP8LBitWriter bw_side;
+  WebPPicture picture_side;
   const WebPWorkerInterface* const worker_interface = WebPGetWorkerInterface();
   int ok_main;
 
+  if (enc_main == NULL || !VP8LBitWriterInit(&bw_side, 0)) {
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
+    VP8LEncoderDelete(enc_main);
+    return 0;
+  }
+
+  // Avoid "garbage value" error from Clang's static analysis tool.
+  WebPPictureInit(&picture_side);
+
   // Analyze image (entropy, num_palettes etc)
-  if (enc_main == NULL ||
-      !EncoderAnalyze(enc_main, crunch_configs, &num_crunch_configs_main,
+  if (!EncoderAnalyze(enc_main, crunch_configs, &num_crunch_configs_main,
                       &red_and_blue_always_zero) ||
-      !EncoderInit(enc_main) || !VP8LBitWriterInit(&bw_side, 0)) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+      !EncoderInit(enc_main)) {
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
@@ -1946,25 +2008,32 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
       StreamEncodeContext* const param =
           (idx == 0) ? &params_main : &params_side;
       param->config_ = config;
-      param->picture_ = picture;
       param->use_cache_ = use_cache;
       param->red_and_blue_always_zero_ = red_and_blue_always_zero;
       if (idx == 0) {
+        param->picture_ = picture;
         param->stats_ = picture->stats;
         param->bw_ = bw_main;
         param->enc_ = enc_main;
       } else {
+        // Create a side picture (error_code is not thread-safe).
+        if (!WebPPictureView(picture, /*left=*/0, /*top=*/0, picture->width,
+                             picture->height, &picture_side)) {
+          assert(0);
+        }
+        picture_side.progress_hook = NULL;  // Progress hook is not thread-safe.
+        param->picture_ = &picture_side;  // No need to free a view afterwards.
         param->stats_ = (picture->stats == NULL) ? NULL : &stats_side;
         // Create a side bit writer.
         if (!VP8LBitWriterClone(bw_main, &bw_side)) {
-          err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+          WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
           goto Error;
         }
         param->bw_ = &bw_side;
         // Create a side encoder.
-        enc_side = VP8LEncoderNew(config, picture);
+        enc_side = VP8LEncoderNew(config, &picture_side);
         if (enc_side == NULL || !EncoderInit(enc_side)) {
-          err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+          WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
           goto Error;
         }
         // Copy the values that were computed for the main encoder.
@@ -1988,7 +2057,7 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
   // Start the second thread if needed.
   if (num_crunch_configs_side != 0) {
     if (!worker_interface->Reset(&worker_side)) {
-      err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+      WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
       goto Error;
     }
 #if !defined(WEBP_DISABLE_STATS)
@@ -1998,8 +2067,6 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
       memcpy(&stats_side, picture->stats, sizeof(stats_side));
     }
 #endif
-    // This line is only useful to remove a Clang static analyzer warning.
-    params_side.err_ = VP8_ENC_OK;
     worker_interface->Launch(&worker_side);
   }
   // Execute the main thread.
@@ -2011,7 +2078,10 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
     const int ok_side = worker_interface->Sync(&worker_side);
     worker_interface->End(&worker_side);
     if (!ok_main || !ok_side) {
-      err = ok_main ? params_side.err_ : params_main.err_;
+      if (picture->error_code == VP8_ENC_OK) {
+        assert(picture_side.error_code != VP8_ENC_OK);
+        WebPEncodingSetError(picture, picture_side.error_code);
+      }
       goto Error;
     }
     if (VP8LBitWriterNumBytes(&bw_side) < VP8LBitWriterNumBytes(bw_main)) {
@@ -2022,18 +2092,13 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
       }
 #endif
     }
-  } else {
-    if (!ok_main) {
-      err = params_main.err_;
-      goto Error;
-    }
   }
 
-Error:
+ Error:
   VP8LBitWriterWipeOut(&bw_side);
   VP8LEncoderDelete(enc_main);
   VP8LEncoderDelete(enc_side);
-  return err;
+  return (picture->error_code == VP8_ENC_OK);
 }
 
 #undef CRUNCH_CONFIGS_MAX
@@ -2046,14 +2111,12 @@ int VP8LEncodeImage(const WebPConfig* const config,
   size_t coded_size;
   int percent = 0;
   int initial_size;
-  WebPEncodingError err = VP8_ENC_OK;
   VP8LBitWriter bw;
 
   if (picture == NULL) return 0;
 
   if (config == NULL || picture->argb == NULL) {
-    err = VP8_ENC_ERROR_NULL_PARAMETER;
-    WebPEncodingSetError(picture, err);
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER);
     return 0;
   }
 
@@ -2064,13 +2127,13 @@ int VP8LEncodeImage(const WebPConfig* const config,
   initial_size = (config->image_hint == WEBP_HINT_GRAPH) ?
       width * height : width * height * 2;
   if (!VP8LBitWriterInit(&bw, initial_size)) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
   if (!WebPReportProgress(picture, 1, &percent)) {
  UserAbort:
-    err = VP8_ENC_ERROR_USER_ABORT;
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_USER_ABORT);
     goto Error;
   }
   // Reset stats (for pure lossless coding)
@@ -2086,28 +2149,26 @@ int VP8LEncodeImage(const WebPConfig* const config,
 
   // Write image size.
   if (!WriteImageSize(picture, &bw)) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
   has_alpha = WebPPictureHasTransparency(picture);
   // Write the non-trivial Alpha flag and lossless version.
   if (!WriteRealAlphaAndVersion(&bw, has_alpha)) {
-    err = VP8_ENC_ERROR_OUT_OF_MEMORY;
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
     goto Error;
   }
 
-  if (!WebPReportProgress(picture, 5, &percent)) goto UserAbort;
+  if (!WebPReportProgress(picture, 2, &percent)) goto UserAbort;
 
   // Encode main image stream.
-  err = VP8LEncodeStream(config, picture, &bw, 1 /*use_cache*/);
-  if (err != VP8_ENC_OK) goto Error;
+  if (!VP8LEncodeStream(config, picture, &bw, 1 /*use_cache*/)) goto Error;
 
-  if (!WebPReportProgress(picture, 90, &percent)) goto UserAbort;
+  if (!WebPReportProgress(picture, 99, &percent)) goto UserAbort;
 
   // Finish the RIFF chunk.
-  err = WriteImage(picture, &bw, &coded_size);
-  if (err != VP8_ENC_OK) goto Error;
+  if (!WriteImage(picture, &bw, &coded_size)) goto Error;
 
   if (!WebPReportProgress(picture, 100, &percent)) goto UserAbort;
 
@@ -2126,13 +2187,11 @@ int VP8LEncodeImage(const WebPConfig* const config,
   }
 
  Error:
-  if (bw.error_) err = VP8_ENC_ERROR_OUT_OF_MEMORY;
-  VP8LBitWriterWipeOut(&bw);
-  if (err != VP8_ENC_OK) {
-    WebPEncodingSetError(picture, err);
-    return 0;
+  if (bw.error_) {
+    WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
   }
-  return 1;
+  VP8LBitWriterWipeOut(&bw);
+  return (picture->error_code == VP8_ENC_OK);
 }
 
 //------------------------------------------------------------------------------
diff --git a/thirdparty/libwebp/src/enc/vp8li_enc.h b/thirdparty/libwebp/src/enc/vp8li_enc.h
index 00de48946c..3d35e1612d 100644
--- a/thirdparty/libwebp/src/enc/vp8li_enc.h
+++ b/thirdparty/libwebp/src/enc/vp8li_enc.h
@@ -89,9 +89,10 @@ int VP8LEncodeImage(const WebPConfig* const config,
 
 // Encodes the main image stream using the supplied bit writer.
 // If 'use_cache' is false, disables the use of color cache.
-WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
-                                   const WebPPicture* const picture,
-                                   VP8LBitWriter* const bw, int use_cache);
+// Returns false in case of error (stored in picture->error_code).
+int VP8LEncodeStream(const WebPConfig* const config,
+                     const WebPPicture* const picture, VP8LBitWriter* const bw,
+                     int use_cache);
 
 #if (WEBP_NEAR_LOSSLESS == 1)
 // in near_lossless.c
@@ -103,13 +104,18 @@ int VP8ApplyNearLossless(const WebPPicture* const picture, int quality,
 //------------------------------------------------------------------------------
 // Image transforms in predictor.c.
 
-void VP8LResidualImage(int width, int height, int bits, int low_effort,
-                       uint32_t* const argb, uint32_t* const argb_scratch,
-                       uint32_t* const image, int near_lossless, int exact,
-                       int used_subtract_green);
-
-void VP8LColorSpaceTransform(int width, int height, int bits, int quality,
-                             uint32_t* const argb, uint32_t* image);
+// pic and percent are for progress.
+// Returns false in case of error (stored in pic->error_code).
+int VP8LResidualImage(int width, int height, int bits, int low_effort,
+                      uint32_t* const argb, uint32_t* const argb_scratch,
+                      uint32_t* const image, int near_lossless, int exact,
+                      int used_subtract_green, const WebPPicture* const pic,
+                      int percent_range, int* const percent);
+
+int VP8LColorSpaceTransform(int width, int height, int bits, int quality,
+                            uint32_t* const argb, uint32_t* image,
+                            const WebPPicture* const pic, int percent_range,
+                            int* const percent);
 
 //------------------------------------------------------------------------------
 
diff --git a/thirdparty/libwebp/src/enc/webp_enc.c b/thirdparty/libwebp/src/enc/webp_enc.c
index ce2db2e94b..9620e05070 100644
--- a/thirdparty/libwebp/src/enc/webp_enc.c
+++ b/thirdparty/libwebp/src/enc/webp_enc.c
@@ -336,9 +336,7 @@ int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
   if (!WebPValidateConfig(config)) {
     return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
   }
-  if (pic->width <= 0 || pic->height <= 0) {
-    return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
-  }
+  if (!WebPValidatePicture(pic)) return 0;
   if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION) {
     return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
   }
diff --git a/thirdparty/libwebp/src/mux/muxedit.c b/thirdparty/libwebp/src/mux/muxedit.c
index 02c3edecd7..63e71a0aba 100644
--- a/thirdparty/libwebp/src/mux/muxedit.c
+++ b/thirdparty/libwebp/src/mux/muxedit.c
@@ -70,6 +70,7 @@ void WebPMuxDelete(WebPMux* mux) {
     err = ChunkAssignData(&chunk, data, copy_data, tag);                       \
     if (err == WEBP_MUX_OK) {                                                  \
       err = ChunkSetHead(&chunk, (LIST));                                      \
+      if (err != WEBP_MUX_OK) ChunkRelease(&chunk);                            \
     }                                                                          \
     return err;                                                                \
   }
diff --git a/thirdparty/libwebp/src/mux/muxi.h b/thirdparty/libwebp/src/mux/muxi.h
index d9bf9b3770..0f4af1784d 100644
--- a/thirdparty/libwebp/src/mux/muxi.h
+++ b/thirdparty/libwebp/src/mux/muxi.h
@@ -29,7 +29,7 @@ extern "C" {
 
 #define MUX_MAJ_VERSION 1
 #define MUX_MIN_VERSION 2
-#define MUX_REV_VERSION 2
+#define MUX_REV_VERSION 4
 
 // Chunk object.
 typedef struct WebPChunk WebPChunk;
diff --git a/thirdparty/libwebp/src/mux/muxinternal.c b/thirdparty/libwebp/src/mux/muxinternal.c
index b9ee6717d3..75b6b416b9 100644
--- a/thirdparty/libwebp/src/mux/muxinternal.c
+++ b/thirdparty/libwebp/src/mux/muxinternal.c
@@ -155,17 +155,18 @@ WebPMuxError ChunkSetHead(WebPChunk* const chunk,
 
 WebPMuxError ChunkAppend(WebPChunk* const chunk,
                          WebPChunk*** const chunk_list) {
+  WebPMuxError err;
   assert(chunk_list != NULL && *chunk_list != NULL);
 
   if (**chunk_list == NULL) {
-    ChunkSetHead(chunk, *chunk_list);
+    err = ChunkSetHead(chunk, *chunk_list);
   } else {
     WebPChunk* last_chunk = **chunk_list;
     while (last_chunk->next_ != NULL) last_chunk = last_chunk->next_;
-    ChunkSetHead(chunk, &last_chunk->next_);
-    *chunk_list = &last_chunk->next_;
+    err = ChunkSetHead(chunk, &last_chunk->next_);
+    if (err == WEBP_MUX_OK) *chunk_list = &last_chunk->next_;
   }
-  return WEBP_MUX_OK;
+  return err;
 }
 
 //------------------------------------------------------------------------------
diff --git a/thirdparty/libwebp/src/webp/encode.h b/thirdparty/libwebp/src/webp/encode.h
index b4c599df87..56b68e2f10 100644
--- a/thirdparty/libwebp/src/webp/encode.h
+++ b/thirdparty/libwebp/src/webp/encode.h
@@ -441,7 +441,7 @@ WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
 // the original dimension will be lost). Picture 'dst' need not be initialized
 // with WebPPictureInit() if it is different from 'src', since its content will
 // be overwritten.
-// Returns false in case of memory allocation error or invalid parameters.
+// Returns false in case of invalid parameters.
 WEBP_EXTERN int WebPPictureView(const WebPPicture* src,
                                 int left, int top, int width, int height,
                                 WebPPicture* dst);
@@ -455,7 +455,7 @@ WEBP_EXTERN int WebPPictureIsView(const WebPPicture* picture);
 // dimension will be calculated preserving the aspect ratio.
 // No gamma correction is applied.
 // Returns false in case of error (invalid parameter or insufficient memory).
-WEBP_EXTERN int WebPPictureRescale(WebPPicture* pic, int width, int height);
+WEBP_EXTERN int WebPPictureRescale(WebPPicture* picture, int width, int height);
 
 // Colorspace conversion function to import RGB samples.
 // Previous buffer will be free'd, if any.
@@ -526,7 +526,7 @@ WEBP_EXTERN int WebPPictureHasTransparency(const WebPPicture* picture);
 // Remove the transparency information (if present) by blending the color with
 // the background color 'background_rgb' (specified as 24bit RGB triplet).
 // After this call, all alpha values are reset to 0xff.
-WEBP_EXTERN void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb);
+WEBP_EXTERN void WebPBlendAlpha(WebPPicture* picture, uint32_t background_rgb);
 
 //------------------------------------------------------------------------------
 // Main call