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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
ninja -C out/Release dm nanobench ; and ./out/Release/dm --match Blend_opts ; and ./out/Release/nanobench --samples 300 --nompd --match LinearSrcOver -q
*/
#ifndef SkBlend_opts_DEFINED
#define SkBlend_opts_DEFINED
#include "SkNx.h"
#include "SkPM4fPriv.h"
#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
#include <immintrin.h>
#endif
namespace SK_OPTS_NS {
static inline void srcover_srgb_srgb_1(uint32_t* dst, uint32_t src) {
if (src >= 0xFF000000) {
*dst = src;
return;
}
auto d = Sk4f_fromS32(*dst),
s = Sk4f_fromS32( src);
*dst = Sk4f_toS32(s + d * (1.0f - s[3]));
}
static inline void srcover_srgb_srgb_4(uint32_t* dst, const uint32_t* src) {
srcover_srgb_srgb_1(dst++, *src++);
srcover_srgb_srgb_1(dst++, *src++);
srcover_srgb_srgb_1(dst++, *src++);
srcover_srgb_srgb_1(dst , *src );
}
#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
static inline __m128i load(const uint32_t* p) {
return _mm_loadu_si128(reinterpret_cast<const __m128i*>(p));
}
static inline void store(uint32_t* p, __m128i v) {
_mm_storeu_si128(reinterpret_cast<__m128i*>(p), v);
}
#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
static void srcover_srgb_srgb(
uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc) {
const __m128i alphaMask = _mm_set1_epi32(0xFF000000);
while (ndst > 0) {
int count = SkTMin(ndst, nsrc);
ndst -= count;
const uint32_t* src = srcStart;
const uint32_t* end = dst + (count & ~3);
ptrdiff_t delta = src - dst;
while (dst < end) {
__m128i pixels = load(src);
if (_mm_testc_si128(pixels, alphaMask)) {
uint32_t* start = dst;
do {
store(dst, pixels);
dst += 4;
} while (dst < end
&& _mm_testc_si128(pixels = load(dst + delta), alphaMask));
src += dst - start;
} else if (_mm_testz_si128(pixels, alphaMask)) {
do {
dst += 4;
src += 4;
} while (dst < end
&& _mm_testz_si128(pixels = load(src), alphaMask));
} else {
uint32_t* start = dst;
do {
srcover_srgb_srgb_4(dst, dst + delta);
dst += 4;
} while (dst < end
&& _mm_testnzc_si128(pixels = load(dst + delta), alphaMask));
src += dst - start;
}
}
count = count & 3;
while (count-- > 0) {
srcover_srgb_srgb_1(dst++, *src++);
}
}
}
#else
// SSE2 versions
// Note: In the next three comparisons a group of 4 pixels is converted to a group of
// "signed" pixels because the sse2 does not have an unsigned comparison.
// Make it so that we can use the signed comparison operators by biasing
// 0x00xxxxxx to 0x80xxxxxxx which is the smallest values and biasing 0xffxxxxxx to
// 0x7fxxxxxx which is the largest set of values.
static inline bool check_opaque_alphas(__m128i pixels) {
__m128i signedPixels = _mm_xor_si128(pixels, _mm_set1_epi32(0x80000000));
int mask =
_mm_movemask_epi8(
_mm_cmplt_epi32(signedPixels, _mm_set1_epi32(0x7F000000)));
return mask == 0;
}
static inline bool check_transparent_alphas(__m128i pixels) {
__m128i signedPixels = _mm_xor_si128(pixels, _mm_set1_epi32(0x80000000));
int mask =
_mm_movemask_epi8(
_mm_cmpgt_epi32(signedPixels, _mm_set1_epi32(0x80FFFFFF)));
return mask == 0;
}
static inline bool check_partial_alphas(__m128i pixels) {
__m128i signedPixels = _mm_xor_si128(pixels, _mm_set1_epi32(0x80000000));
__m128i opaque = _mm_cmplt_epi32(signedPixels, _mm_set1_epi32(0x7F000000));
__m128i transparent = _mm_cmpgt_epi32(signedPixels, _mm_set1_epi32(0x80FFFFFF));
int mask = _mm_movemask_epi8(_mm_xor_si128(opaque, transparent));
return mask == 0;
}
static void srcover_srgb_srgb(
uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc) {
while (ndst > 0) {
int count = SkTMin(ndst, nsrc);
ndst -= count;
const uint32_t* src = srcStart;
const uint32_t* end = dst + (count & ~3);
const ptrdiff_t delta = src - dst;
__m128i pixels = load(src);
do {
if (check_opaque_alphas(pixels)) {
uint32_t* start = dst;
do {
store(dst, pixels);
dst += 4;
} while (dst < end && check_opaque_alphas((pixels = load(dst + delta))));
src += dst - start;
} else if (check_transparent_alphas(pixels)) {
const uint32_t* start = dst;
do {
dst += 4;
} while (dst < end && check_transparent_alphas(pixels = load(dst + delta)));
src += dst - start;
} else {
const uint32_t* start = dst;
do {
srcover_srgb_srgb_4(dst, dst + delta);
dst += 4;
} while (dst < end && check_partial_alphas(pixels = load(dst + delta)));
src += dst - start;
}
} while (dst < end);
count = count & 3;
while (count-- > 0) {
srcover_srgb_srgb_1(dst++, *src++);
}
}
}
#endif
#else
static void srcover_srgb_srgb(
uint32_t* dst, const uint32_t* const src, int ndst, const int nsrc) {
while (ndst > 0) {
int n = SkTMin(ndst, nsrc);
for (int i = 0; i < n; i++) {
srcover_srgb_srgb_1(dst++, src[i]);
}
ndst -= n;
}
}
#endif
} // namespace SK_OPTS_NS
#endif//SkBlend_opts_DEFINED
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