webp: Make it a module and unbundle libwebp thirdparty files

Note that there are two Godot-specific changes made to libwebp
for the javascript/HTML5 platform. They are documented in the
README.md.

1 files changed, 186 insertions, 0 deletions

diff --git a/thirdparty/libwebp/dsp/rescaler_neon.c b/thirdparty/libwebp/dsp/rescaler_neon.c
new file mode 100644
index 0000000000..16fd450ea3
--- /dev/null
+++ b/thirdparty/libwebp/dsp/rescaler_neon.c
@@ -0,0 +1,186 @@
+// Copyright 2015 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.
+// -----------------------------------------------------------------------------
+//
+// NEON version of rescaling functions
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "./dsp.h"
+
+#if defined(WEBP_USE_NEON)
+
+#include <arm_neon.h>
+#include <assert.h>
+#include "./neon.h"
+#include "../utils/rescaler.h"
+
+#define ROUNDER (WEBP_RESCALER_ONE >> 1)
+#define MULT_FIX_C(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX)
+
+#define LOAD_32x4(SRC, DST) const uint32x4_t DST = vld1q_u32((SRC))
+#define LOAD_32x8(SRC, DST0, DST1)                                    \
+    LOAD_32x4(SRC + 0, DST0);                                         \
+    LOAD_32x4(SRC + 4, DST1)
+
+#define STORE_32x8(SRC0, SRC1, DST) do {                              \
+    vst1q_u32((DST) + 0, SRC0);                                       \
+    vst1q_u32((DST) + 4, SRC1);                                       \
+} while (0);
+
+#if (WEBP_RESCALER_RFIX == 32)
+#define MAKE_HALF_CST(C) vdupq_n_s32((int32_t)((C) >> 1))
+#define MULT_FIX(A, B) /* note: B is actualy scale>>1. See MAKE_HALF_CST */ \
+    vreinterpretq_u32_s32(vqrdmulhq_s32(vreinterpretq_s32_u32((A)), (B)))
+#else
+#error "MULT_FIX/WEBP_RESCALER_RFIX need some more work"
+#endif
+
+static uint32x4_t Interpolate(const rescaler_t* const frow,
+                              const rescaler_t* const irow,
+                              uint32_t A, uint32_t B) {
+  LOAD_32x4(frow, A0);
+  LOAD_32x4(irow, B0);
+  const uint64x2_t C0 = vmull_n_u32(vget_low_u32(A0), A);
+  const uint64x2_t C1 = vmull_n_u32(vget_high_u32(A0), A);
+  const uint64x2_t D0 = vmlal_n_u32(C0, vget_low_u32(B0), B);
+  const uint64x2_t D1 = vmlal_n_u32(C1, vget_high_u32(B0), B);
+  const uint32x4_t E = vcombine_u32(
+      vrshrn_n_u64(D0, WEBP_RESCALER_RFIX),
+      vrshrn_n_u64(D1, WEBP_RESCALER_RFIX));
+  return E;
+}
+
+static void RescalerExportRowExpand(WebPRescaler* const wrk) {
+  int x_out;
+  uint8_t* const dst = wrk->dst;
+  rescaler_t* const irow = wrk->irow;
+  const int x_out_max = wrk->dst_width * wrk->num_channels;
+  const int max_span = x_out_max & ~7;
+  const rescaler_t* const frow = wrk->frow;
+  const uint32_t fy_scale = wrk->fy_scale;
+  const int32x4_t fy_scale_half = MAKE_HALF_CST(fy_scale);
+  assert(!WebPRescalerOutputDone(wrk));
+  assert(wrk->y_accum <= 0);
+  assert(wrk->y_expand);
+  assert(wrk->y_sub != 0);
+  if (wrk->y_accum == 0) {
+    for (x_out = 0; x_out < max_span; x_out += 8) {
+      LOAD_32x4(frow + x_out + 0, A0);
+      LOAD_32x4(frow + x_out + 4, A1);
+      const uint32x4_t B0 = MULT_FIX(A0, fy_scale_half);
+      const uint32x4_t B1 = MULT_FIX(A1, fy_scale_half);
+      const uint16x4_t C0 = vmovn_u32(B0);
+      const uint16x4_t C1 = vmovn_u32(B1);
+      const uint8x8_t D = vmovn_u16(vcombine_u16(C0, C1));
+      vst1_u8(dst + x_out, D);
+    }
+    for (; x_out < x_out_max; ++x_out) {
+      const uint32_t J = frow[x_out];
+      const int v = (int)MULT_FIX_C(J, fy_scale);
+      assert(v >= 0 && v <= 255);
+      dst[x_out] = v;
+    }
+  } else {
+    const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
+    const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
+    for (x_out = 0; x_out < max_span; x_out += 8) {
+      const uint32x4_t C0 =
+          Interpolate(frow + x_out + 0, irow + x_out + 0, A, B);
+      const uint32x4_t C1 =
+          Interpolate(frow + x_out + 4, irow + x_out + 4, A, B);
+      const uint32x4_t D0 = MULT_FIX(C0, fy_scale_half);
+      const uint32x4_t D1 = MULT_FIX(C1, fy_scale_half);
+      const uint16x4_t E0 = vmovn_u32(D0);
+      const uint16x4_t E1 = vmovn_u32(D1);
+      const uint8x8_t F = vmovn_u16(vcombine_u16(E0, E1));
+      vst1_u8(dst + x_out, F);
+    }
+    for (; x_out < x_out_max; ++x_out) {
+      const uint64_t I = (uint64_t)A * frow[x_out]
+                       + (uint64_t)B * irow[x_out];
+      const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX);
+      const int v = (int)MULT_FIX_C(J, fy_scale);
+      assert(v >= 0 && v <= 255);
+      dst[x_out] = v;
+    }
+  }
+}
+
+static void RescalerExportRowShrink(WebPRescaler* const wrk) {
+  int x_out;
+  uint8_t* const dst = wrk->dst;
+  rescaler_t* const irow = wrk->irow;
+  const int x_out_max = wrk->dst_width * wrk->num_channels;
+  const int max_span = x_out_max & ~7;
+  const rescaler_t* const frow = wrk->frow;
+  const uint32_t yscale = wrk->fy_scale * (-wrk->y_accum);
+  const uint32_t fxy_scale = wrk->fxy_scale;
+  const uint32x4_t zero = vdupq_n_u32(0);
+  const int32x4_t yscale_half = MAKE_HALF_CST(yscale);
+  const int32x4_t fxy_scale_half = MAKE_HALF_CST(fxy_scale);
+  assert(!WebPRescalerOutputDone(wrk));
+  assert(wrk->y_accum <= 0);
+  assert(!wrk->y_expand);
+  if (yscale) {
+    for (x_out = 0; x_out < max_span; x_out += 8) {
+      LOAD_32x8(frow + x_out, in0, in1);
+      LOAD_32x8(irow + x_out, in2, in3);
+      const uint32x4_t A0 = MULT_FIX(in0, yscale_half);
+      const uint32x4_t A1 = MULT_FIX(in1, yscale_half);
+      const uint32x4_t B0 = vqsubq_u32(in2, A0);
+      const uint32x4_t B1 = vqsubq_u32(in3, A1);
+      const uint32x4_t C0 = MULT_FIX(B0, fxy_scale_half);
+      const uint32x4_t C1 = MULT_FIX(B1, fxy_scale_half);
+      const uint16x4_t D0 = vmovn_u32(C0);
+      const uint16x4_t D1 = vmovn_u32(C1);
+      const uint8x8_t E = vmovn_u16(vcombine_u16(D0, D1));
+      vst1_u8(dst + x_out, E);
+      STORE_32x8(A0, A1, irow + x_out);
+    }
+    for (; x_out < x_out_max; ++x_out) {
+      const uint32_t frac = (uint32_t)MULT_FIX_C(frow[x_out], yscale);
+      const int v = (int)MULT_FIX_C(irow[x_out] - frac, wrk->fxy_scale);
+      assert(v >= 0 && v <= 255);
+      dst[x_out] = v;
+      irow[x_out] = frac;   // new fractional start
+    }
+  } else {
+    for (x_out = 0; x_out < max_span; x_out += 8) {
+      LOAD_32x8(irow + x_out, in0, in1);
+      const uint32x4_t A0 = MULT_FIX(in0, fxy_scale_half);
+      const uint32x4_t A1 = MULT_FIX(in1, fxy_scale_half);
+      const uint16x4_t B0 = vmovn_u32(A0);
+      const uint16x4_t B1 = vmovn_u32(A1);
+      const uint8x8_t C = vmovn_u16(vcombine_u16(B0, B1));
+      vst1_u8(dst + x_out, C);
+      STORE_32x8(zero, zero, irow + x_out);
+    }
+    for (; x_out < x_out_max; ++x_out) {
+      const int v = (int)MULT_FIX_C(irow[x_out], fxy_scale);
+      assert(v >= 0 && v <= 255);
+      dst[x_out] = v;
+      irow[x_out] = 0;
+    }
+  }
+}
+
+//------------------------------------------------------------------------------
+
+extern void WebPRescalerDspInitNEON(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitNEON(void) {
+  WebPRescalerExportRowExpand = RescalerExportRowExpand;
+  WebPRescalerExportRowShrink = RescalerExportRowShrink;
+}
+
+#else     // !WEBP_USE_NEON
+
+WEBP_DSP_INIT_STUB(WebPRescalerDspInitNEON)
+
+#endif    // WEBP_USE_NEON