| // 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 <smmintrin.h> |
| #include "src/dsp/lossless.h" |
| |
| // For sign-extended multiplying constants, pre-shifted by 5: |
| #define CST_5b(X) (((int16_t)((uint16_t)(X) << 8)) >> 5) |
| |
| //------------------------------------------------------------------------------ |
| // 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 |
| |
| #define SPAN 8 |
| static void CollectColorBlueTransforms_SSE41(const uint32_t* argb, int stride, |
| int tile_width, int tile_height, |
| int green_to_blue, int red_to_blue, |
| int histo[]) { |
| const __m128i mults_r = _mm_set1_epi16(CST_5b(red_to_blue)); |
| const __m128i mults_g = _mm_set1_epi16(CST_5b(green_to_blue)); |
| const __m128i mask_g = _mm_set1_epi16(0xff00); // green mask |
| const __m128i mask_gb = _mm_set1_epi32(0xffff); // green/blue mask |
| const __m128i mask_b = _mm_set1_epi16(0x00ff); // blue mask |
| const __m128i shuffler_lo = _mm_setr_epi8(-1, 2, -1, 6, -1, 10, -1, 14, -1, |
| -1, -1, -1, -1, -1, -1, -1); |
| const __m128i shuffler_hi = _mm_setr_epi8(-1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 2, -1, 6, -1, 10, -1, 14); |
| int y; |
| for (y = 0; y < tile_height; ++y) { |
| const uint32_t* const src = argb + y * stride; |
| int i, x; |
| for (x = 0; x + SPAN <= tile_width; x += SPAN) { |
| uint16_t values[SPAN]; |
| const __m128i in0 = _mm_loadu_si128((__m128i*)&src[x + 0]); |
| const __m128i in1 = _mm_loadu_si128((__m128i*)&src[x + SPAN / 2]); |
| const __m128i r0 = _mm_shuffle_epi8(in0, shuffler_lo); |
| const __m128i r1 = _mm_shuffle_epi8(in1, shuffler_hi); |
| const __m128i r = _mm_or_si128(r0, r1); // r 0 |
| const __m128i gb0 = _mm_and_si128(in0, mask_gb); |
| const __m128i gb1 = _mm_and_si128(in1, mask_gb); |
| const __m128i gb = _mm_packus_epi32(gb0, gb1); // g b |
| const __m128i g = _mm_and_si128(gb, mask_g); // g 0 |
| const __m128i A = _mm_mulhi_epi16(r, mults_r); // x dbr |
| const __m128i B = _mm_mulhi_epi16(g, mults_g); // x dbg |
| const __m128i C = _mm_sub_epi8(gb, B); // x b' |
| const __m128i D = _mm_sub_epi8(C, A); // x b'' |
| const __m128i E = _mm_and_si128(D, mask_b); // 0 b'' |
| _mm_storeu_si128((__m128i*)values, E); |
| for (i = 0; i < SPAN; ++i) ++histo[values[i]]; |
| } |
| } |
| { |
| const int left_over = tile_width & (SPAN - 1); |
| 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* argb, int stride, |
| int tile_width, int tile_height, |
| int green_to_red, int histo[]) { |
| const __m128i mults_g = _mm_set1_epi16(CST_5b(green_to_red)); |
| const __m128i mask_g = _mm_set1_epi32(0x00ff00); // green mask |
| const __m128i mask = _mm_set1_epi16(0xff); |
| |
| int y; |
| for (y = 0; y < tile_height; ++y) { |
| const uint32_t* const src = argb + y * stride; |
| int i, x; |
| for (x = 0; x + SPAN <= tile_width; x += SPAN) { |
| uint16_t values[SPAN]; |
| const __m128i in0 = _mm_loadu_si128((__m128i*)&src[x + 0]); |
| const __m128i in1 = _mm_loadu_si128((__m128i*)&src[x + SPAN / 2]); |
| const __m128i g0 = _mm_and_si128(in0, mask_g); // 0 0 | g 0 |
| const __m128i g1 = _mm_and_si128(in1, mask_g); |
| const __m128i g = _mm_packus_epi32(g0, g1); // g 0 |
| const __m128i A0 = _mm_srli_epi32(in0, 16); // 0 0 | x r |
| const __m128i A1 = _mm_srli_epi32(in1, 16); |
| const __m128i A = _mm_packus_epi32(A0, A1); // x r |
| const __m128i B = _mm_mulhi_epi16(g, mults_g); // x dr |
| const __m128i C = _mm_sub_epi8(A, B); // x r' |
| const __m128i D = _mm_and_si128(C, mask); // 0 r' |
| _mm_storeu_si128((__m128i*)values, D); |
| for (i = 0; i < SPAN; ++i) ++histo[values[i]]; |
| } |
| } |
| { |
| const int left_over = tile_width & (SPAN - 1); |
| if (left_over > 0) { |
| VP8LCollectColorRedTransforms_C(argb + tile_width - left_over, stride, |
| left_over, tile_height, green_to_red, |
| histo); |
| } |
| } |
| } |
| |
| //------------------------------------------------------------------------------ |
| // Entry point |
| |
| extern void VP8LEncDspInitSSE41(void); |
| |
| WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE41(void) { |
| VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed_SSE41; |
| VP8LCollectColorBlueTransforms = CollectColorBlueTransforms_SSE41; |
| VP8LCollectColorRedTransforms = CollectColorRedTransforms_SSE41; |
| } |
| |
| #else // !WEBP_USE_SSE41 |
| |
| WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE41) |
| |
| #endif // WEBP_USE_SSE41 |