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simplify sse41::srcover_srgb_srgb

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Most importantly, remove the undefined behavior implied by "delta".

Change-Id: I8f9740804ec74dd40b049eafd4f0d51b36ce3237
Reviewed-on: https://skia-review.googlesource.com/18140
Reviewed-by: Herb Derby <herb@google.com>
This commit is contained in:
Mike Klein 2017-05-30 15:16:45 -04:00
parent f81c56f3c0
commit 25e90055a0
1 changed files with 7 additions and 22 deletions
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29
src/opts/SkBlend_opts.h
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@ -56,33 +56,18 @@ static inline void srcover_srgb_srgb_4(uint32_t* dst, const uint32_t* src) {
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;
store(dst, pixels);
} else if (!_mm_testz_si128(pixels, alphaMask)) {
srcover_srgb_srgb_4(dst, src);
}
dst += 4;
src += 4;
}
count = count & 3;