| /* |
| * Copyright 2019 Google LLC |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/GrSwizzle.h" |
| |
| #include "src/core/SkRasterPipeline.h" |
| |
| void GrSwizzle::apply(SkRasterPipeline* pipeline) const { |
| SkASSERT(pipeline); |
| switch (fKey) { |
| case GrSwizzle("rgba").asKey(): |
| return; |
| case GrSwizzle("bgra").asKey(): |
| pipeline->append(SkRasterPipeline::swap_rb); |
| return; |
| case GrSwizzle("aaa1").asKey(): |
| pipeline->append(SkRasterPipeline::alpha_to_gray); |
| return; |
| case GrSwizzle("rgb1").asKey(): |
| pipeline->append(SkRasterPipeline::force_opaque); |
| return; |
| default: { |
| static_assert(sizeof(uintptr_t) >= 4 * sizeof(char)); |
| // Rather than allocate the 4 control bytes on the heap somewhere, just jam them right |
| // into a uintptr_t context. |
| uintptr_t ctx; |
| memcpy(&ctx, this->asString().c_str(), 4 * sizeof(char)); |
| pipeline->append(SkRasterPipeline::swizzle, ctx); |
| return; |
| } |
| } |
| } |
| |
| SkString GrSwizzle::asString() const { |
| char swiz[5]; |
| uint16_t key = fKey; |
| for (int i = 0; i < 4; ++i) { |
| swiz[i] = IToC(key & 0xfU); |
| key >>= 4; |
| } |
| swiz[4] = '\0'; |
| return SkString(swiz); |
| } |