1 /* 2 * Copyright 2019 Google LLC 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 #include "src/gpu/Swizzle.h" 9 10 #include "src/core/SkRasterPipeline.h" 11 #include "src/core/SkRasterPipelineOpList.h" 12 13 #include <cstring> 14 15 namespace skgpu { 16 apply(SkRasterPipeline * pipeline) const17void Swizzle::apply(SkRasterPipeline* pipeline) const { 18 SkASSERT(pipeline); 19 switch (fKey) { 20 case Swizzle("rgba").asKey(): 21 return; 22 case Swizzle("bgra").asKey(): 23 pipeline->append(SkRasterPipelineOp::swap_rb); 24 return; 25 case Swizzle("aaa1").asKey(): 26 pipeline->append(SkRasterPipelineOp::alpha_to_gray); 27 return; 28 case Swizzle("rgb1").asKey(): 29 pipeline->append(SkRasterPipelineOp::force_opaque); 30 return; 31 case Swizzle("a001").asKey(): 32 pipeline->append(SkRasterPipelineOp::alpha_to_red); 33 return; 34 default: { 35 static_assert(sizeof(uintptr_t) >= 4 * sizeof(char)); 36 // Rather than allocate the 4 control bytes on the heap somewhere, just jam them right 37 // into a uintptr_t context. 38 uintptr_t ctx = {}; 39 memcpy(&ctx, this->asString().c_str(), 4 * sizeof(char)); 40 pipeline->append(SkRasterPipelineOp::swizzle, ctx); 41 return; 42 } 43 } 44 } 45 asString() const46SkString Swizzle::asString() const { 47 char swiz[5]; 48 uint16_t key = fKey; 49 for (int i = 0; i < 4; ++i) { 50 swiz[i] = IToC(key & 0xfU); 51 key >>= 4; 52 } 53 swiz[4] = '\0'; 54 return SkString(swiz); 55 } 56 57 } // namespace skgpu 58