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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkArenaAlloc.h"
#include "SkOverdrawColorFilter.h"
#include "SkPM4f.h"
#include "SkRasterPipeline.h"
#include "SkReadBuffer.h"
#include "../jumper/SkJumper.h"
void SkOverdrawColorFilter::onAppendStages(SkRasterPipeline* p,
SkColorSpace* dstCS,
SkArenaAlloc* alloc,
bool shader_is_opaque) const {
struct Ctx : public SkJumper_CallbackCtx {
const SkPMColor* colors;
};
// TODO: do we care about transforming to dstCS?
auto ctx = alloc->make<Ctx>();
ctx->colors = fColors;
ctx->fn = [](SkJumper_CallbackCtx* arg, int active_pixels) {
auto ctx = (Ctx*)arg;
auto pixels = (SkPM4f*)ctx->rgba;
for (int i = 0; i < active_pixels; i++) {
uint8_t alpha = (int)(pixels[i].a() * 255);
if (alpha >= kNumColors) {
alpha = kNumColors - 1;
}
pixels[i] = SkPM4f::FromPMColor(ctx->colors[alpha]);
}
};
p->append(SkRasterPipeline::callback, ctx);
}
void SkOverdrawColorFilter::toString(SkString* str) const {
str->append("SkOverdrawColorFilter (");
for (int i = 0; i < kNumColors; i++) {
str->appendf("%d: %x\n", i, fColors[i]);
}
str->append(")");
}
void SkOverdrawColorFilter::flatten(SkWriteBuffer& buffer) const {
buffer.writeByteArray(fColors, kNumColors * sizeof(SkPMColor));
}
sk_sp<SkFlattenable> SkOverdrawColorFilter::CreateProc(SkReadBuffer& buffer) {
SkPMColor colors[kNumColors];
size_t size = buffer.getArrayCount();
if (!buffer.validate(size == sizeof(colors))) {
return nullptr;
}
if (!buffer.readByteArray(colors, sizeof(colors))) {
return nullptr;
}
return SkOverdrawColorFilter::Make(colors);
}
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkOverdrawColorFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkOverdrawColorFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
#if SK_SUPPORT_GPU
#include "GrFragmentProcessor.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
class OverdrawFragmentProcessor : public GrFragmentProcessor {
public:
static sk_sp<GrFragmentProcessor> Make(const SkPMColor* colors);
const char* name() const override { return "Overdraw"; }
sk_sp<GrFragmentProcessor> clone() const override {
return sk_sp<GrFragmentProcessor>(new OverdrawFragmentProcessor(fColors));
}
private:
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor&) const override;
OverdrawFragmentProcessor(const GrColor4f* colors);
GrColor4f fColors[SkOverdrawColorFilter::kNumColors];
typedef GrFragmentProcessor INHERITED;
};
class GLOverdrawFragmentProcessor : public GrGLSLFragmentProcessor {
public:
GLOverdrawFragmentProcessor(const GrColor4f* colors);
void emitCode(EmitArgs&) override;
protected:
void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override {}
private:
GrColor4f fColors[SkOverdrawColorFilter::kNumColors];
typedef GrGLSLFragmentProcessor INHERITED;
};
sk_sp<GrFragmentProcessor> SkOverdrawColorFilter::asFragmentProcessor(GrContext*,
SkColorSpace*) const {
return OverdrawFragmentProcessor::Make(fColors);
}
sk_sp<GrFragmentProcessor> OverdrawFragmentProcessor::Make(const SkPMColor* colors) {
GrColor4f grColors[SkOverdrawColorFilter::kNumColors];
for (int i = 0; i < SkOverdrawColorFilter::kNumColors; i++) {
grColors[i] = GrColor4f::FromGrColor(GrColorPackRGBA(SkGetPackedR32(colors[i]),
SkGetPackedG32(colors[i]),
SkGetPackedB32(colors[i]),
SkGetPackedA32(colors[i])));
}
return sk_sp<GrFragmentProcessor>(new OverdrawFragmentProcessor(grColors));
}
// This could implement the constant input -> constant output optimization, but we don't really
// care given how this is used.
OverdrawFragmentProcessor::OverdrawFragmentProcessor(const GrColor4f* colors)
: INHERITED(kNone_OptimizationFlags) {
this->initClassID<OverdrawFragmentProcessor>();
memcpy(fColors, colors, SkOverdrawColorFilter::kNumColors * sizeof(GrColor4f));
}
GrGLSLFragmentProcessor* OverdrawFragmentProcessor::onCreateGLSLInstance() const {
return new GLOverdrawFragmentProcessor(fColors);
}
bool OverdrawFragmentProcessor::onIsEqual(const GrFragmentProcessor& other) const {
const OverdrawFragmentProcessor& that = other.cast<OverdrawFragmentProcessor>();
return 0 == memcmp(fColors, that.fColors,
sizeof(GrColor4f) * SkOverdrawColorFilter::kNumColors);
}
GLOverdrawFragmentProcessor::GLOverdrawFragmentProcessor(const GrColor4f* colors) {
memcpy(fColors, colors, SkOverdrawColorFilter::kNumColors * sizeof(GrColor4f));
}
void GLOverdrawFragmentProcessor::emitCode(EmitArgs& args) {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
if (nullptr == args.fInputColor) {
fragBuilder->codeAppendf("%s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[5].fRGBA[0],
fColors[5].fRGBA[1],
fColors[5].fRGBA[2],
fColors[5].fRGBA[3]);
} else {
fragBuilder->codeAppendf("float alpha = 255.0 * %s.a;", args.fInputColor);
fragBuilder->codeAppendf("if (alpha < 0.5) {");
fragBuilder->codeAppendf(" %s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[0].fRGBA[0],
fColors[0].fRGBA[1],
fColors[0].fRGBA[2],
fColors[0].fRGBA[3]);
fragBuilder->codeAppendf("} else if (alpha < 1.5) {");
fragBuilder->codeAppendf(" %s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[1].fRGBA[0],
fColors[1].fRGBA[1],
fColors[1].fRGBA[2],
fColors[1].fRGBA[3]);
fragBuilder->codeAppendf("} else if (alpha < 2.5) {");
fragBuilder->codeAppendf(" %s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[2].fRGBA[0],
fColors[2].fRGBA[1],
fColors[2].fRGBA[2],
fColors[2].fRGBA[3]);
fragBuilder->codeAppendf("} else if (alpha < 3.5) {");
fragBuilder->codeAppendf(" %s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[3].fRGBA[0],
fColors[3].fRGBA[1],
fColors[3].fRGBA[2],
fColors[3].fRGBA[3]);
fragBuilder->codeAppendf("} else if (alpha < 4.5) {");
fragBuilder->codeAppendf(" %s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[4].fRGBA[0],
fColors[4].fRGBA[1],
fColors[4].fRGBA[2],
fColors[4].fRGBA[3]);
fragBuilder->codeAppendf("} else {");
fragBuilder->codeAppendf(" %s.rgba = float4(%f, %f, %f, %f);", args.fOutputColor,
fColors[5].fRGBA[0],
fColors[5].fRGBA[1],
fColors[5].fRGBA[2],
fColors[5].fRGBA[3]);
fragBuilder->codeAppendf("}");
}
}
#endif
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