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Open Source Computer Vision Library
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53 lines
1.8 KiB
53 lines
1.8 KiB
// 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(uint32_t* argb_data, 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; |
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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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