blob: 3bef983b11f5db00c6dfadc4ccd8786dd78401f3 [file] [log] [blame]
/*
* 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);
}