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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"
namespace SK_OPTS_NS {
// An implementation of SrcOver from bytes to bytes in linear space that takes advantage of the
// observation that the 255's cancel.
// invA = 1 - (As / 255);
//
// R = 255 * sqrt((Rs/255)^2 + (Rd/255)^2 * invA)
// => R = 255 * sqrt((Rs^2 + Rd^2 * invA)/255^2)
// => R = sqrt(Rs^2 + Rd^2 * invA)
static inline void blend_srgb_srgb_1(uint32_t* dst, const uint32_t pixel) {
Sk4f s = srgb_to_linear(to_4f(pixel));
Sk4f d = srgb_to_linear(to_4f(*dst));
Sk4f invAlpha = 1.0f - Sk4f{s[SkPM4f::A]} * (1.0f / 255.0f);
Sk4f r = linear_to_srgb(s + d * invAlpha);
*dst = to_4b(r);
}
static inline void srcover_srgb_srgb_1(uint32_t* dst, const uint32_t pixel) {
if ((~pixel & 0xFF000000) == 0) {
*dst = pixel;
} else if ((pixel & 0xFF000000) != 0) {
blend_srgb_srgb_1(dst, pixel);
}
}
static inline void srcover_srgb_srgb_2(uint32_t* dst, const uint32_t* src) {
srcover_srgb_srgb_1(dst++, *src++);
srcover_srgb_srgb_1(dst, *src);
}
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);
}
void best_non_simd_srcover_srgb_srgb(
uint32_t* dst, const uint32_t* const src, int ndst, const int nsrc) {
uint64_t* ddst = reinterpret_cast<uint64_t*>(dst);
while (ndst >0) {
int count = SkTMin(ndst, nsrc);
ndst -= count;
const uint64_t* dsrc = reinterpret_cast<const uint64_t*>(src);
const uint64_t* end = dsrc + (count >> 1);
do {
if ((~*dsrc & 0xFF000000FF000000) == 0) {
do {
*ddst++ = *dsrc++;
} while (dsrc < end && (~*dsrc & 0xFF000000FF000000) == 0);
} else if ((*dsrc & 0xFF000000FF000000) == 0) {
do {
dsrc++;
ddst++;
} while (dsrc < end && (*dsrc & 0xFF000000FF000000) == 0);
} else {
srcover_srgb_srgb_2(reinterpret_cast<uint32_t*>(ddst++),
reinterpret_cast<const uint32_t*>(dsrc++));
}
} while (dsrc < end);
if ((count & 1) != 0) {
srcover_srgb_srgb_1(reinterpret_cast<uint32_t*>(ddst),
*reinterpret_cast<const uint32_t*>(dsrc));
}
}
}
void brute_force_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++) {
blend_srgb_srgb_1(dst++, src[i]);
}
ndst -= n;
}
}
void trivial_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;
}
}
#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
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 = src + (count & ~3);
while (src < end) {
__m128i pixels = load(src);
if (_mm_testc_si128(pixels, alphaMask)) {
do {
store(dst, pixels);
dst += 4;
src += 4;
} while (src < end && _mm_testc_si128(pixels = load(src), alphaMask));
} else if (_mm_testz_si128(pixels, alphaMask)) {
do {
dst += 4;
src += 4;
} while (src < end && _mm_testz_si128(pixels = load(src), alphaMask));
} else {
do {
srcover_srgb_srgb_4(dst, src);
dst += 4;
src += 4;
} while (src < end && _mm_testnzc_si128(pixels = load(src), alphaMask));
}
}
count = count & 3;
while (count-- > 0) {
srcover_srgb_srgb_1(dst++, *src++);
}
}
}
#else
// SSE2 versions
static inline bool check_opaque_alphas(__m128i pixels) {
int mask =
_mm_movemask_epi8(
_mm_cmpeq_epi32(
_mm_andnot_si128(pixels, _mm_set1_epi32(0xFF000000)),
_mm_setzero_si128()));
return mask == 0xFFFF;
}
static inline bool check_transparent_alphas(__m128i pixels) {
int mask =
_mm_movemask_epi8(
_mm_cmpeq_epi32(
_mm_and_si128(pixels, _mm_set1_epi32(0xFF000000)),
_mm_setzero_si128()));
return mask == 0xFFFF;
}
static inline bool check_partial_alphas(__m128i pixels) {
__m128i alphas = _mm_and_si128(pixels, _mm_set1_epi32(0xFF000000));
int mask =
_mm_movemask_epi8(
_mm_cmpeq_epi8(
_mm_srai_epi32(alphas, 8),
alphas));
return mask == 0xFFFF;
}
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 = src + (count & ~3);
__m128i pixels = load(src);
do {
if (check_opaque_alphas(pixels)) {
do {
store(dst, pixels);
dst += 4;
src += 4;
} while (src < end && check_opaque_alphas(pixels = load(src)));
} else if (check_transparent_alphas(pixels)) {
const uint32_t* start = src;
do {
src += 4;
} while (src < end && check_transparent_alphas(pixels = load(src)));
dst += src - start;
} else {
do {
srcover_srgb_srgb_4(dst, src);
dst += 4;
src += 4;
} while (src < end && check_partial_alphas(pixels = load(src)));
}
} while (src < end);
count = count & 3;
while (count-- > 0) {
srcover_srgb_srgb_1(dst++, *src++);
}
}
}
#endif
#else
void srcover_srgb_srgb(
uint32_t* dst, const uint32_t* const src, int ndst, const int nsrc) {
trivial_srcover_srgb_srgb(dst, src, ndst, nsrc);
}
#endif
} // namespace SK_OPTS_NS
#endif//SkBlend_opts_DEFINED
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