diff options
Diffstat (limited to 'media/libwebp/dsp/alpha_processing_sse2.c')
| -rw-r--r-- | media/libwebp/dsp/alpha_processing_sse2.c | 88 |
1 files changed, 73 insertions, 15 deletions
diff --git a/media/libwebp/dsp/alpha_processing_sse2.c b/media/libwebp/dsp/alpha_processing_sse2.c index 83dc559fa..9a3bc4485 100644 --- a/media/libwebp/dsp/alpha_processing_sse2.c +++ b/media/libwebp/dsp/alpha_processing_sse2.c @@ -11,16 +11,16 @@ // // Author: Skal (pascal.massimino@gmail.com) -#include "./dsp.h" +#include "../dsp/dsp.h" #if defined(WEBP_USE_SSE2) #include <emmintrin.h> //------------------------------------------------------------------------------ -static int DispatchAlpha(const uint8_t* alpha, int alpha_stride, - int width, int height, - uint8_t* dst, int dst_stride) { +static int DispatchAlpha_SSE2(const uint8_t* alpha, int alpha_stride, + int width, int height, + uint8_t* dst, int dst_stride) { // alpha_and stores an 'and' operation of all the alpha[] values. The final // value is not 0xff if any of the alpha[] is not equal to 0xff. uint32_t alpha_and = 0xff; @@ -72,9 +72,9 @@ static int DispatchAlpha(const uint8_t* alpha, int alpha_stride, return (alpha_and != 0xff); } -static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride, - int width, int height, - uint32_t* dst, int dst_stride) { +static void DispatchAlphaToGreen_SSE2(const uint8_t* alpha, int alpha_stride, + int width, int height, + uint32_t* dst, int dst_stride) { int i, j; const __m128i zero = _mm_setzero_si128(); const int limit = width & ~15; @@ -98,9 +98,9 @@ static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride, } } -static int ExtractAlpha(const uint8_t* argb, int argb_stride, - int width, int height, - uint8_t* alpha, int alpha_stride) { +static int ExtractAlpha_SSE2(const uint8_t* argb, int argb_stride, + int width, int height, + uint8_t* alpha, int alpha_stride) { // alpha_and stores an 'and' operation of all the alpha[] values. The final // value is not 0xff if any of the alpha[] is not equal to 0xff. uint32_t alpha_and = 0xff; @@ -210,6 +210,61 @@ static void ApplyAlphaMultiply_SSE2(uint8_t* rgba, int alpha_first, #undef MULTIPLIER #undef PREMULTIPLY +//------------------------------------------------------------------------------ +// Alpha detection + +static int HasAlpha8b_SSE2(const uint8_t* src, int length) { + const __m128i all_0xff = _mm_set1_epi8(0xff); + int i = 0; + for (; i + 16 <= length; i += 16) { + const __m128i v = _mm_loadu_si128((const __m128i*)(src + i)); + const __m128i bits = _mm_cmpeq_epi8(v, all_0xff); + const int mask = _mm_movemask_epi8(bits); + if (mask != 0xffff) return 1; + } + for (; i < length; ++i) if (src[i] != 0xff) return 1; + return 0; +} + +static int HasAlpha32b_SSE2(const uint8_t* src, int length) { + const __m128i alpha_mask = _mm_set1_epi32(0xff); + const __m128i all_0xff = _mm_set1_epi8(0xff); + int i = 0; + // We don't know if we can access the last 3 bytes after the last alpha + // value 'src[4 * length - 4]' (because we don't know if alpha is the first + // or the last byte of the quadruplet). Hence the '-3' protection below. + length = length * 4 - 3; // size in bytes + for (; i + 64 <= length; i += 64) { + const __m128i a0 = _mm_loadu_si128((const __m128i*)(src + i + 0)); + const __m128i a1 = _mm_loadu_si128((const __m128i*)(src + i + 16)); + const __m128i a2 = _mm_loadu_si128((const __m128i*)(src + i + 32)); + const __m128i a3 = _mm_loadu_si128((const __m128i*)(src + i + 48)); + const __m128i b0 = _mm_and_si128(a0, alpha_mask); + const __m128i b1 = _mm_and_si128(a1, alpha_mask); + const __m128i b2 = _mm_and_si128(a2, alpha_mask); + const __m128i b3 = _mm_and_si128(a3, alpha_mask); + const __m128i c0 = _mm_packs_epi32(b0, b1); + const __m128i c1 = _mm_packs_epi32(b2, b3); + const __m128i d = _mm_packus_epi16(c0, c1); + const __m128i bits = _mm_cmpeq_epi8(d, all_0xff); + const int mask = _mm_movemask_epi8(bits); + if (mask != 0xffff) return 1; + } + for (; i + 32 <= length; i += 32) { + const __m128i a0 = _mm_loadu_si128((const __m128i*)(src + i + 0)); + const __m128i a1 = _mm_loadu_si128((const __m128i*)(src + i + 16)); + const __m128i b0 = _mm_and_si128(a0, alpha_mask); + const __m128i b1 = _mm_and_si128(a1, alpha_mask); + const __m128i c = _mm_packs_epi32(b0, b1); + const __m128i d = _mm_packus_epi16(c, c); + const __m128i bits = _mm_cmpeq_epi8(d, all_0xff); + const int mask = _mm_movemask_epi8(bits); + if (mask != 0xffff) return 1; + } + for (; i <= length; i += 4) if (src[i] != 0xff) return 1; + return 0; +} + // ----------------------------------------------------------------------------- // Apply alpha value to rows @@ -238,7 +293,7 @@ static void MultARGBRow_SSE2(uint32_t* const ptr, int width, int inverse) { } } width -= x; - if (width > 0) WebPMultARGBRowC(ptr + x, width, inverse); + if (width > 0) WebPMultARGBRow_C(ptr + x, width, inverse); } static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha, @@ -261,7 +316,7 @@ static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha, } } width -= x; - if (width > 0) WebPMultRowC(ptr + x, alpha + x, width, inverse); + if (width > 0) WebPMultRow_C(ptr + x, alpha + x, width, inverse); } //------------------------------------------------------------------------------ @@ -273,9 +328,12 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) { WebPMultARGBRow = MultARGBRow_SSE2; WebPMultRow = MultRow_SSE2; WebPApplyAlphaMultiply = ApplyAlphaMultiply_SSE2; - WebPDispatchAlpha = DispatchAlpha; - WebPDispatchAlphaToGreen = DispatchAlphaToGreen; - WebPExtractAlpha = ExtractAlpha; + WebPDispatchAlpha = DispatchAlpha_SSE2; + WebPDispatchAlphaToGreen = DispatchAlphaToGreen_SSE2; + WebPExtractAlpha = ExtractAlpha_SSE2; + + WebPHasAlpha8b = HasAlpha8b_SSE2; + WebPHasAlpha32b = HasAlpha32b_SSE2; } #else // !WEBP_USE_SSE2 |