Initial release

2026-08-16 18:27:57 +07:00
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+// 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.
+// -----------------------------------------------------------------------------
+//
+// SSE4.1 variant of methods for lossless encoder
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "src/dsp/dsp.h"
+
+#if defined(WEBP_USE_SSE41)
+#include <assert.h>
+#include <emmintrin.h>
+#include <smmintrin.h>
+
+#include "src/dsp/cpu.h"
+#include "src/dsp/lossless.h"
+#include "src/webp/types.h"
+
+//------------------------------------------------------------------------------
+// Cost operations.
+
+static WEBP_INLINE uint32_t HorizontalSum_SSE41(__m128i cost) {
+  cost = _mm_add_epi32(cost, _mm_srli_si128(cost, 8));
+  cost = _mm_add_epi32(cost, _mm_srli_si128(cost, 4));
+  return _mm_cvtsi128_si32(cost);
+}
+
+static uint32_t ExtraCost_SSE41(const uint32_t* const a, int length) {
+  int i;
+  __m128i cost = _mm_set_epi32(2 * a[7], 2 * a[6], a[5], a[4]);
+  assert(length % 8 == 0);
+
+  for (i = 8; i + 8 <= length; i += 8) {
+    const int j = (i - 2) >> 1;
+    const __m128i a0 = _mm_loadu_si128((const __m128i*)&a[i]);
+    const __m128i a1 = _mm_loadu_si128((const __m128i*)&a[i + 4]);
+    const __m128i w = _mm_set_epi32(j + 3, j + 2, j + 1, j);
+    const __m128i a2 = _mm_hadd_epi32(a0, a1);
+    const __m128i mul = _mm_mullo_epi32(a2, w);
+    cost = _mm_add_epi32(mul, cost);
+  }
+  return HorizontalSum_SSE41(cost);
+}
+
+//------------------------------------------------------------------------------
+// Subtract-Green Transform
+
+static void SubtractGreenFromBlueAndRed_SSE41(uint32_t* argb_data,
+                                              int num_pixels) {
+  int i;
+  const __m128i kCstShuffle =
+      _mm_set_epi8(-1, 13, -1, 13, -1, 9, -1, 9, -1, 5, -1, 5, -1, 1, -1, 1);
+  for (i = 0; i + 4 <= num_pixels; i += 4) {
+    const __m128i in = _mm_loadu_si128((__m128i*)&argb_data[i]);
+    const __m128i in_0g0g = _mm_shuffle_epi8(in, kCstShuffle);
+    const __m128i out = _mm_sub_epi8(in, in_0g0g);
+    _mm_storeu_si128((__m128i*)&argb_data[i], out);
+  }
+  // fallthrough and finish off with plain-C
+  if (i != num_pixels) {
+    VP8LSubtractGreenFromBlueAndRed_C(argb_data + i, num_pixels - i);
+  }
+}
+
+//------------------------------------------------------------------------------
+// Color Transform
+
+// For sign-extended multiplying constants, pre-shifted by 5:
+#define CST_5b(X) (((int16_t)((uint16_t)(X) << 8)) >> 5)
+
+#define MK_CST_16(HI, LO) \
+  _mm_set1_epi32((int)(((uint32_t)(HI) << 16) | ((LO) & 0xffff)))
+
+static void CollectColorBlueTransforms_SSE41(const uint32_t* WEBP_RESTRICT argb,
+                                             int stride, int tile_width,
+                                             int tile_height, int green_to_blue,
+                                             int red_to_blue,
+                                             uint32_t histo[]) {
+  const __m128i mult =
+      MK_CST_16(CST_5b(red_to_blue) + 256, CST_5b(green_to_blue));
+  const __m128i perm =
+      _mm_setr_epi8(-1, 1, -1, 2, -1, 5, -1, 6, -1, 9, -1, 10, -1, 13, -1, 14);
+  if (tile_width >= 4) {
+    int y;
+    for (y = 0; y < tile_height; ++y) {
+      const uint32_t* const src = argb + y * stride;
+      const __m128i A1 = _mm_loadu_si128((const __m128i*)src);
+      const __m128i B1 = _mm_shuffle_epi8(A1, perm);
+      const __m128i C1 = _mm_mulhi_epi16(B1, mult);
+      const __m128i D1 = _mm_sub_epi16(A1, C1);
+      __m128i E = _mm_add_epi16(_mm_srli_epi32(D1, 16), D1);
+      int x;
+      for (x = 4; x + 4 <= tile_width; x += 4) {
+        const __m128i A2 = _mm_loadu_si128((const __m128i*)(src + x));
+        __m128i B2, C2, D2;
+        ++histo[_mm_extract_epi8(E, 0)];
+        B2 = _mm_shuffle_epi8(A2, perm);
+        ++histo[_mm_extract_epi8(E, 4)];
+        C2 = _mm_mulhi_epi16(B2, mult);
+        ++histo[_mm_extract_epi8(E, 8)];
+        D2 = _mm_sub_epi16(A2, C2);
+        ++histo[_mm_extract_epi8(E, 12)];
+        E = _mm_add_epi16(_mm_srli_epi32(D2, 16), D2);
+      }
+      ++histo[_mm_extract_epi8(E, 0)];
+      ++histo[_mm_extract_epi8(E, 4)];
+      ++histo[_mm_extract_epi8(E, 8)];
+      ++histo[_mm_extract_epi8(E, 12)];
+    }
+  }
+  {
+    const int left_over = tile_width & 3;
+    if (left_over > 0) {
+      VP8LCollectColorBlueTransforms_C(argb + tile_width - left_over, stride,
+                                       left_over, tile_height, green_to_blue,
+                                       red_to_blue, histo);
+    }
+  }
+}
+
+static void CollectColorRedTransforms_SSE41(const uint32_t* WEBP_RESTRICT argb,
+                                            int stride, int tile_width,
+                                            int tile_height, int green_to_red,
+                                            uint32_t histo[]) {
+  const __m128i mult = MK_CST_16(0, CST_5b(green_to_red));
+  const __m128i mask_g = _mm_set1_epi32(0x0000ff00);
+  if (tile_width >= 4) {
+    int y;
+    for (y = 0; y < tile_height; ++y) {
+      const uint32_t* const src = argb + y * stride;
+      const __m128i A1 = _mm_loadu_si128((const __m128i*)src);
+      const __m128i B1 = _mm_and_si128(A1, mask_g);
+      const __m128i C1 = _mm_madd_epi16(B1, mult);
+      __m128i D = _mm_sub_epi16(A1, C1);
+      int x;
+      for (x = 4; x + 4 <= tile_width; x += 4) {
+        const __m128i A2 = _mm_loadu_si128((const __m128i*)(src + x));
+        __m128i B2, C2;
+        ++histo[_mm_extract_epi8(D, 2)];
+        B2 = _mm_and_si128(A2, mask_g);
+        ++histo[_mm_extract_epi8(D, 6)];
+        C2 = _mm_madd_epi16(B2, mult);
+        ++histo[_mm_extract_epi8(D, 10)];
+        ++histo[_mm_extract_epi8(D, 14)];
+        D = _mm_sub_epi16(A2, C2);
+      }
+      ++histo[_mm_extract_epi8(D, 2)];
+      ++histo[_mm_extract_epi8(D, 6)];
+      ++histo[_mm_extract_epi8(D, 10)];
+      ++histo[_mm_extract_epi8(D, 14)];
+    }
+  }
+  {
+    const int left_over = tile_width & 3;
+    if (left_over > 0) {
+      VP8LCollectColorRedTransforms_C(argb + tile_width - left_over, stride,
+                                      left_over, tile_height, green_to_red,
+                                      histo);
+    }
+  }
+}
+
+#undef MK_CST_16
+
+//------------------------------------------------------------------------------
+// Entry point
+
+extern void VP8LEncDspInitSSE41(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE41(void) {
+  VP8LExtraCost = ExtraCost_SSE41;
+
+  // SSE exports for AVX and above.
+  VP8LSubtractGreenFromBlueAndRed_SSE = SubtractGreenFromBlueAndRed_SSE41;
+  VP8LCollectColorBlueTransforms_SSE = CollectColorBlueTransforms_SSE41;
+  VP8LCollectColorRedTransforms_SSE = CollectColorRedTransforms_SSE41;
+
+  VP8LSubtractGreenFromBlueAndRed = VP8LSubtractGreenFromBlueAndRed_SSE;
+  VP8LCollectColorBlueTransforms = VP8LCollectColorBlueTransforms_SSE;
+  VP8LCollectColorRedTransforms = VP8LCollectColorRedTransforms_SSE;
+}
+
+#else  // !WEBP_USE_SSE41
+
+WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE41)
+
+#endif  // WEBP_USE_SSE41