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- /*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef GrPaint_DEFINED
- #define GrPaint_DEFINED
- #include "include/core/SkBlendMode.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkRegion.h"
- #include "src/core/SkTLazy.h"
- #include "src/gpu/GrColor.h"
- #include "src/gpu/GrFragmentProcessor.h"
- class GrTextureProxy;
- class GrXPFactory;
- /**
- * The paint describes how color and coverage are computed at each pixel by GrContext draw
- * functions and the how color is blended with the destination pixel.
- *
- * The paint allows installation of custom color and coverage stages. New types of stages are
- * created by subclassing GrProcessor.
- *
- * The primitive color computation starts with the color specified by setColor(). This color is the
- * input to the first color stage. Each color stage feeds its output to the next color stage.
- *
- * Fractional pixel coverage follows a similar flow. The GrGeometryProcessor (specified elsewhere)
- * provides the initial coverage which is passed to the first coverage fragment processor, which
- * feeds its output to next coverage fragment processor.
- *
- * setXPFactory is used to control blending between the output color and dest. It also implements
- * the application of fractional coverage from the coverage pipeline.
- */
- class GrPaint {
- public:
- GrPaint() = default;
- ~GrPaint() = default;
- static GrPaint Clone(const GrPaint& src) { return GrPaint(src); }
- /**
- * The initial color of the drawn primitive. Defaults to solid white.
- */
- void setColor4f(const SkPMColor4f& color) { fColor = color; }
- const SkPMColor4f& getColor4f() const { return fColor; }
- void setXPFactory(const GrXPFactory* xpFactory) {
- fXPFactory = xpFactory;
- fTrivial &= !SkToBool(xpFactory);
- }
- void setPorterDuffXPFactory(SkBlendMode mode);
- void setCoverageSetOpXPFactory(SkRegion::Op, bool invertCoverage = false);
- /**
- * Appends an additional color processor to the color computation.
- */
- void addColorFragmentProcessor(std::unique_ptr<GrFragmentProcessor> fp) {
- SkASSERT(fp);
- fColorFragmentProcessors.push_back(std::move(fp));
- fTrivial = false;
- }
- /**
- * Appends an additional coverage processor to the coverage computation.
- */
- void addCoverageFragmentProcessor(std::unique_ptr<GrFragmentProcessor> fp) {
- SkASSERT(fp);
- fCoverageFragmentProcessors.push_back(std::move(fp));
- fTrivial = false;
- }
- /**
- * Helpers for adding color or coverage effects that sample a texture. The matrix is applied
- * to the src space position to compute texture coordinates.
- */
- void addColorTextureProcessor(sk_sp<GrTextureProxy>, const SkMatrix&);
- void addColorTextureProcessor(sk_sp<GrTextureProxy>, const SkMatrix&, const GrSamplerState&);
- void addCoverageTextureProcessor(sk_sp<GrTextureProxy>, const SkMatrix&);
- void addCoverageTextureProcessor(sk_sp<GrTextureProxy>, const SkMatrix&, const GrSamplerState&);
- int numColorFragmentProcessors() const { return fColorFragmentProcessors.count(); }
- int numCoverageFragmentProcessors() const { return fCoverageFragmentProcessors.count(); }
- int numTotalFragmentProcessors() const { return this->numColorFragmentProcessors() +
- this->numCoverageFragmentProcessors(); }
- const GrXPFactory* getXPFactory() const { return fXPFactory; }
- GrFragmentProcessor* getColorFragmentProcessor(int i) const {
- return fColorFragmentProcessors[i].get();
- }
- GrFragmentProcessor* getCoverageFragmentProcessor(int i) const {
- return fCoverageFragmentProcessors[i].get();
- }
- /**
- * Returns true if the paint's output color will be constant after blending. If the result is
- * true, constantColor will be updated to contain the constant color. Note that we can conflate
- * coverage and color, so the actual values written to pixels with partial coverage may still
- * not seem constant, even if this function returns true.
- */
- bool isConstantBlendedColor(SkPMColor4f* constantColor) const;
- /**
- * A trivial paint is one that uses src-over and has no fragment processors.
- * It may have variable sRGB settings.
- **/
- bool isTrivial() const { return fTrivial; }
- friend void assert_alive(GrPaint& p) {
- SkASSERT(p.fAlive);
- }
- private:
- // Since paint copying is expensive if there are fragment processors, we require going through
- // the Clone() method.
- GrPaint(const GrPaint&);
- GrPaint& operator=(const GrPaint&) = delete;
- friend class GrProcessorSet;
- const GrXPFactory* fXPFactory = nullptr;
- SkSTArray<4, std::unique_ptr<GrFragmentProcessor>> fColorFragmentProcessors;
- SkSTArray<2, std::unique_ptr<GrFragmentProcessor>> fCoverageFragmentProcessors;
- bool fTrivial = true;
- SkPMColor4f fColor = SK_PMColor4fWHITE;
- SkDEBUGCODE(bool fAlive = true;) // Set false after moved from.
- };
- #endif
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