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check pm swizzle when extracting lcd coverage

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BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1706283005

Review URL: https://codereview.chromium.org/1706283005
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reed 2016-02-19 13:46:03 -08:00 committed by Commit bot
parent c5b1228141
commit 3b32bc51f4
1 changed files with 4 additions and 0 deletions
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4
src/core/SkXfermode4f.cpp
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@ -427,7 +427,11 @@ SkXfermode::PM4fProcN SkXfermode::getPM4fProcN(uint32_t flags) const {
#include "SkColorPriv.h"
static Sk4f lcd16_to_unit_4f(uint16_t rgb) {
#ifdef SK_PMCOLOR_IS_RGBA
Sk4i rgbi = Sk4i(SkGetPackedR16(rgb), SkGetPackedG16(rgb), SkGetPackedB16(rgb), 0);
#else
Sk4i rgbi = Sk4i(SkGetPackedB16(rgb), SkGetPackedG16(rgb), SkGetPackedR16(rgb), 0);
#endif
return SkNx_cast<float>(rgbi) * Sk4f(1.0f/31, 1.0f/63, 1.0f/31, 0);
}