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+// Copyright 2012 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.
+// -----------------------------------------------------------------------------
+//
+// Image transforms and color space conversion methods for lossless decoder.
+//
+// Authors: Vikas Arora (vikaas.arora@gmail.com)
+// Jyrki Alakuijala (jyrki@google.com)
+// Vincent Rabaud (vrabaud@google.com)
+
+#ifndef WEBP_DSP_LOSSLESS_COMMON_H_
+#define WEBP_DSP_LOSSLESS_COMMON_H_
+
+#include "src/webp/types.h"
+
+#include "src/utils/utils.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//------------------------------------------------------------------------------
+// Decoding
+
+// color mapping related functions.
+static WEBP_INLINE uint32_t VP8GetARGBIndex(uint32_t idx) {
+ return (idx >> 8) & 0xff;
+}
+
+static WEBP_INLINE uint8_t VP8GetAlphaIndex(uint8_t idx) {
+ return idx;
+}
+
+static WEBP_INLINE uint32_t VP8GetARGBValue(uint32_t val) {
+ return val;
+}
+
+static WEBP_INLINE uint8_t VP8GetAlphaValue(uint32_t val) {
+ return (val >> 8) & 0xff;
+}
+
+//------------------------------------------------------------------------------
+// Misc methods.
+
+// Computes sampled size of 'size' when sampling using 'sampling bits'.
+static WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size,
+ uint32_t sampling_bits) {
+ return (size + (1 << sampling_bits) - 1) >> sampling_bits;
+}
+
+// Converts near lossless quality into max number of bits shaved off.
+static WEBP_INLINE int VP8LNearLosslessBits(int near_lossless_quality) {
+ // 100 -> 0
+ // 80..99 -> 1
+ // 60..79 -> 2
+ // 40..59 -> 3
+ // 20..39 -> 4
+ // 0..19 -> 5
+ return 5 - near_lossless_quality / 20;
+}
+
+// -----------------------------------------------------------------------------
+// Faster logarithm for integers. Small values use a look-up table.
+
+// The threshold till approximate version of log_2 can be used.
+// Practically, we can get rid of the call to log() as the two values match to
+// very high degree (the ratio of these two is 0.99999x).
+// Keeping a high threshold for now.
+#define APPROX_LOG_WITH_CORRECTION_MAX 65536
+#define APPROX_LOG_MAX 4096
+#define LOG_2_RECIPROCAL 1.44269504088896338700465094007086
+#define LOG_LOOKUP_IDX_MAX 256
+extern const float kLog2Table[LOG_LOOKUP_IDX_MAX];
+extern const float kSLog2Table[LOG_LOOKUP_IDX_MAX];
+typedef float (*VP8LFastLog2SlowFunc)(uint32_t v);
+
+extern VP8LFastLog2SlowFunc VP8LFastLog2Slow;
+extern VP8LFastLog2SlowFunc VP8LFastSLog2Slow;
+
+static WEBP_INLINE float VP8LFastLog2(uint32_t v) {
+ return (v < LOG_LOOKUP_IDX_MAX) ? kLog2Table[v] : VP8LFastLog2Slow(v);
+}
+// Fast calculation of v * log2(v) for integer input.
+static WEBP_INLINE float VP8LFastSLog2(uint32_t v) {
+ return (v < LOG_LOOKUP_IDX_MAX) ? kSLog2Table[v] : VP8LFastSLog2Slow(v);
+}
+
+// -----------------------------------------------------------------------------
+// PrefixEncode()
+
+// Splitting of distance and length codes into prefixes and
+// extra bits. The prefixes are encoded with an entropy code
+// while the extra bits are stored just as normal bits.
+static WEBP_INLINE void VP8LPrefixEncodeBitsNoLUT(int distance, int* const code,
+ int* const extra_bits) {
+ const int highest_bit = BitsLog2Floor(--distance);
+ const int second_highest_bit = (distance >> (highest_bit - 1)) & 1;
+ *extra_bits = highest_bit - 1;
+ *code = 2 * highest_bit + second_highest_bit;
+}
+
+static WEBP_INLINE void VP8LPrefixEncodeNoLUT(int distance, int* const code,
+ int* const extra_bits,
+ int* const extra_bits_value) {
+ const int highest_bit = BitsLog2Floor(--distance);
+ const int second_highest_bit = (distance >> (highest_bit - 1)) & 1;
+ *extra_bits = highest_bit - 1;
+ *extra_bits_value = distance & ((1 << *extra_bits) - 1);
+ *code = 2 * highest_bit + second_highest_bit;
+}
+
+#define PREFIX_LOOKUP_IDX_MAX 512
+typedef struct {
+ int8_t code_;
+ int8_t extra_bits_;
+} VP8LPrefixCode;
+
+// These tables are derived using VP8LPrefixEncodeNoLUT.
+extern const VP8LPrefixCode kPrefixEncodeCode[PREFIX_LOOKUP_IDX_MAX];
+extern const uint8_t kPrefixEncodeExtraBitsValue[PREFIX_LOOKUP_IDX_MAX];
+static WEBP_INLINE void VP8LPrefixEncodeBits(int distance, int* const code,
+ int* const extra_bits) {
+ if (distance < PREFIX_LOOKUP_IDX_MAX) {
+ const VP8LPrefixCode prefix_code = kPrefixEncodeCode[distance];
+ *code = prefix_code.code_;
+ *extra_bits = prefix_code.extra_bits_;
+ } else {
+ VP8LPrefixEncodeBitsNoLUT(distance, code, extra_bits);
+ }
+}
+
+static WEBP_INLINE void VP8LPrefixEncode(int distance, int* const code,
+ int* const extra_bits,
+ int* const extra_bits_value) {
+ if (distance < PREFIX_LOOKUP_IDX_MAX) {
+ const VP8LPrefixCode prefix_code = kPrefixEncodeCode[distance];
+ *code = prefix_code.code_;
+ *extra_bits = prefix_code.extra_bits_;
+ *extra_bits_value = kPrefixEncodeExtraBitsValue[distance];
+ } else {
+ VP8LPrefixEncodeNoLUT(distance, code, extra_bits, extra_bits_value);
+ }
+}
+
+// Sum of each component, mod 256.
+static WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW WEBP_INLINE
+uint32_t VP8LAddPixels(uint32_t a, uint32_t b) {
+ const uint32_t alpha_and_green = (a & 0xff00ff00u) + (b & 0xff00ff00u);
+ const uint32_t red_and_blue = (a & 0x00ff00ffu) + (b & 0x00ff00ffu);
+ return (alpha_and_green & 0xff00ff00u) | (red_and_blue & 0x00ff00ffu);
+}
+
+// Difference of each component, mod 256.
+static WEBP_UBSAN_IGNORE_UNSIGNED_OVERFLOW WEBP_INLINE
+uint32_t VP8LSubPixels(uint32_t a, uint32_t b) {
+ const uint32_t alpha_and_green =
+ 0x00ff00ffu + (a & 0xff00ff00u) - (b & 0xff00ff00u);
+ const uint32_t red_and_blue =
+ 0xff00ff00u + (a & 0x00ff00ffu) - (b & 0x00ff00ffu);
+ return (alpha_and_green & 0xff00ff00u) | (red_and_blue & 0x00ff00ffu);
+}
+
+//------------------------------------------------------------------------------
+// Transform-related functions use din both encoding and decoding.
+
+// Macros used to create a batch predictor that iteratively uses a
+// one-pixel predictor.
+
+// The predictor is added to the output pixel (which
+// is therefore considered as a residual) to get the final prediction.
+#define GENERATE_PREDICTOR_ADD(PREDICTOR, PREDICTOR_ADD) \
+static void PREDICTOR_ADD(const uint32_t* in, const uint32_t* upper, \
+ int num_pixels, uint32_t* out) { \
+ int x; \
+ for (x = 0; x < num_pixels; ++x) { \
+ const uint32_t pred = (PREDICTOR)(out[x - 1], upper + x); \
+ out[x] = VP8LAddPixels(in[x], pred); \
+ } \
+}
+
+// It subtracts the prediction from the input pixel and stores the residual
+// in the output pixel.
+#define GENERATE_PREDICTOR_SUB(PREDICTOR, PREDICTOR_SUB) \
+static void PREDICTOR_SUB(const uint32_t* in, const uint32_t* upper, \
+ int num_pixels, uint32_t* out) { \
+ int x; \
+ for (x = 0; x < num_pixels; ++x) { \
+ const uint32_t pred = (PREDICTOR)(in[x - 1], upper + x); \
+ out[x] = VP8LSubPixels(in[x], pred); \
+ } \
+}
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // WEBP_DSP_LOSSLESS_COMMON_H_
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