GrMatrixEffect.h

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/*
 * Copyright 2020 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef GrMatrixEffect_DEFINED
#define GrMatrixEffect_DEFINED
 
#include "include/core/SkMatrix.h"
#include "include/core/SkTypes.h"
#include "include/private/SkColorData.h"
#include "include/private/SkSLSampleUsage.h"
#include "src/gpu/ganesh/GrFragmentProcessor.h"
#include "src/gpu/ganesh/GrProcessorUnitTest.h"
 
#include <memory>
#include <utility>
 
namespace skgpu { class KeyBuilder; }
struct GrShaderCaps;
 
class GrMatrixEffect : public GrFragmentProcessor {
public:
    static std::unique_ptr<GrFragmentProcessor> Make(const SkMatrix& matrix,
                                                     std::unique_ptr<GrFragmentProcessor> child);
 
    std::unique_ptr<GrFragmentProcessor> clone() const override;
    const char* name() const override { return "MatrixEffect"; }
 
private:
    GrMatrixEffect(const GrMatrixEffect& src);
 
    GrMatrixEffect(SkMatrix matrix, std::unique_ptr<GrFragmentProcessor> child)
            : INHERITED(kGrMatrixEffect_ClassID, ProcessorOptimizationFlags(child.get()))
            , fMatrix(matrix) {
        SkASSERT(child);
        this->registerChild(std::move(child),
                            SkSL::SampleUsage::UniformMatrix(matrix.hasPerspective()));
    }
 
    std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override;
    void onAddToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override;
    bool onIsEqual(const GrFragmentProcessor&) const override;
    SkPMColor4f constantOutputForConstantInput(const SkPMColor4f& inputColor) const override {
        return ConstantOutputForConstantInput(this->childProcessor(0), inputColor);
    }
 
    SkMatrix fMatrix;
 
    GR_DECLARE_FRAGMENT_PROCESSOR_TEST
    using INHERITED = GrFragmentProcessor;
};
#endif