| // 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 "third_party/chromium_headless/libwebp/dsp/dsp.h" |
| |
| #if defined(WEBP_USE_SSE41) |
| #include <assert.h> |
| #include <smmintrin.h> |
| #include "third_party/chromium_headless/libwebp/dsp/lossless.h" |
| |
| //------------------------------------------------------------------------------ |
| // Subtract-Green Transform |
| |
| static void SubtractGreenFromBlueAndRed(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 |
| VP8LSubtractGreenFromBlueAndRed_C(argb_data + i, num_pixels - i); |
| } |
| |
| //------------------------------------------------------------------------------ |
| // Entry point |
| |
| extern void VP8LEncDspInitSSE41(void); |
| |
| WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE41(void) { |
| VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed; |
| } |
| |
| #else // !WEBP_USE_SSE41 |
| |
| WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE41) |
| |
| #endif // WEBP_USE_SSE41 |
