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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 <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 MK_CST_16(HI, LO) \
_mm_set1_epi32((int)(((uint32_t)(HI) << 16) | ((LO) & 0xffff)))
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 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* argb, int stride,
int tile_width, int tile_height,
int green_to_red, int 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) {
VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed_SSE41;
VP8LCollectColorBlueTransforms = CollectColorBlueTransforms_SSE41;
VP8LCollectColorRedTransforms = CollectColorRedTransforms_SSE41;
}
#else // !WEBP_USE_SSE41
WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE41)
#endif // WEBP_USE_SSE41
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