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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// SSE4.1 variant of methods for lossless encoder
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_SSE41)
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#include <assert.h>
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#include <smmintrin.h>
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#include "./lossless.h"
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//------------------------------------------------------------------------------
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// Subtract-Green Transform
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static void SubtractGreenFromBlueAndRed_SSE41(uint32_t* argb_data,
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int num_pixels) {
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int i;
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const __m128i kCstShuffle = _mm_set_epi8(-1, 13, -1, 13, -1, 9, -1, 9,
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-1, 5, -1, 5, -1, 1, -1, 1);
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for (i = 0; i + 4 <= num_pixels; i += 4) {
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const __m128i in = _mm_loadu_si128((__m128i*)&argb_data[i]);
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const __m128i in_0g0g = _mm_shuffle_epi8(in, kCstShuffle);
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const __m128i out = _mm_sub_epi8(in, in_0g0g);
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_mm_storeu_si128((__m128i*)&argb_data[i], out);
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}
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// fallthrough and finish off with plain-C
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if (i != num_pixels) {
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VP8LSubtractGreenFromBlueAndRed_C(argb_data + i, num_pixels - i);
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}
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}
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//------------------------------------------------------------------------------
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// Entry point
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extern void VP8LEncDspInitSSE41(void);
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WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitSSE41(void) {
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VP8LSubtractGreenFromBlueAndRed = SubtractGreenFromBlueAndRed_SSE41;
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}
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#else // !WEBP_USE_SSE41
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WEBP_DSP_INIT_STUB(VP8LEncDspInitSSE41)
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#endif // WEBP_USE_SSE41
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