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 12 namespace skgpu { 13 apply(SkRasterPipeline * pipeline) const14void Swizzle::apply(SkRasterPipeline* pipeline) const { 15 SkASSERT(pipeline); 16 switch (fKey) { 17 case Swizzle("rgba").asKey(): 18 return; 19 case Swizzle("bgra").asKey(): 20 pipeline->append(SkRasterPipeline::swap_rb); 21 return; 22 case Swizzle("aaa1").asKey(): 23 pipeline->append(SkRasterPipeline::alpha_to_gray); 24 return; 25 case Swizzle("rgb1").asKey(): 26 pipeline->append(SkRasterPipeline::force_opaque); 27 return; 28 case Swizzle("a001").asKey(): 29 pipeline->append(SkRasterPipeline::alpha_to_red); 30 return; 31 default: { 32 static_assert(sizeof(uintptr_t) >= 4 * sizeof(char)); 33 // Rather than allocate the 4 control bytes on the heap somewhere, just jam them right 34 // into a uintptr_t context. 35 uintptr_t ctx; 36 memcpy(&ctx, this->asString().c_str(), 4 * sizeof(char)); 37 pipeline->append(SkRasterPipeline::swizzle, ctx); 38 return; 39 } 40 } 41 } 42 asString() const43SkString Swizzle::asString() const { 44 char swiz[5]; 45 uint16_t key = fKey; 46 for (int i = 0; i < 4; ++i) { 47 swiz[i] = IToC(key & 0xfU); 48 key >>= 4; 49 } 50 swiz[4] = '\0'; 51 return SkString(swiz); 52 } 53 54 } // namespace skgpu 55