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, SkPMColor color) { 21 unsigned invA = 255 - SkGetPackedA32(color); 22 invA += invA >> 7; 23 SkASSERT(invA < 256); // We've should have already handled alpha == 0 externally. 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 36
