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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkBlitRow_opts_DEFINED
#define SkBlitRow_opts_DEFINED
#include "Sk4px.h"
namespace SK_OPTS_NS {
// Color32 uses the blend_256_round_alt algorithm from tests/BlendTest.cpp.
// It's not quite perfect, but it's never wrong in the interesting edge cases,
// and it's quite a bit faster than blend_perfect.
//
// blend_256_round_alt is our currently blessed algorithm. Please use it or an analogous one.
static void blit_row_color32(SkPMColor* dst, const SkPMColor* src, int count, SkPMColor color) {
unsigned invA = 255 - SkGetPackedA32(color);
invA += invA >> 7;
SkASSERT(invA < 256); // We've should have already handled alpha == 0 externally.
Sk16h colorHighAndRound = Sk4px::DupPMColor(color).widenHi() + Sk16h(128);
Sk16b invA_16x(invA);
Sk4px::MapSrc(count, dst, src, [&](const Sk4px& src4) -> Sk4px {
return (src4 * invA_16x).addNarrowHi(colorHighAndRound);
});
}
} // SK_OPTS_NS
#endif//SkBlitRow_opts_DEFINED
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