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| 1 /* |
| 2 * Copyright 2015 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkBlitRow_opts_DEFINED |
| 9 #define SkBlitRow_opts_DEFINED |
| 10 |
| 11 #include "Sk4px.h" |
| 12 |
| 13 namespace SK_OPTS_NS { |
| 14 |
| 15 // Color32 uses the blend_256_round_alt algorithm from tests/BlendTest.cpp. |
| 16 // It's not quite perfect, but it's never wrong in the interesting edge cases, |
| 17 // and it's quite a bit faster than blend_perfect. |
| 18 // |
| 19 // blend_256_round_alt is our currently blessed algorithm. Please use it or an
analogous one. |
| 20 static void blit_row_color32(SkPMColor* dst, const SkPMColor* src, int count, Sk
PMColor color) { |
| 21 unsigned invA = 255 - SkGetPackedA32(color); |
| 22 invA += invA >> 7; |
| 23 SkASSERT(invA < 256); // We've should have already handled alpha == 0 exter
nally. |
| 24 |
| 25 Sk16h colorHighAndRound = Sk4px::DupPMColor(color).widenHi() + Sk16h(128); |
| 26 Sk16b invA_16x(invA); |
| 27 |
| 28 Sk4px::MapSrc(count, dst, src, [&](const Sk4px& src4) -> Sk4px { |
| 29 return (src4 * invA_16x).addNarrowHi(colorHighAndRound); |
| 30 }); |
| 31 } |
| 32 |
| 33 } // SK_OPTS_NS |
| 34 |
| 35 #endif//SkBlitRow_opts_DEFINED |
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