| |
| /* |
| * 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); |
| |
| /** |
| * Sets a processor for color computation. |
| */ |
| void setColorFragmentProcessor(std::unique_ptr<GrFragmentProcessor> fp) { |
| SkASSERT(fp); |
| SkASSERT(fColorFragmentProcessor == nullptr); |
| fColorFragmentProcessor = std::move(fp); |
| fTrivial = false; |
| } |
| |
| /** |
| * Appends an additional coverage processor to the coverage computation. |
| */ |
| void setCoverageFragmentProcessor(std::unique_ptr<GrFragmentProcessor> fp) { |
| SkASSERT(fp); |
| SkASSERT(fCoverageFragmentProcessor == nullptr); |
| fCoverageFragmentProcessor = std::move(fp); |
| fTrivial = false; |
| } |
| |
| bool hasColorFragmentProcessor() const { return fColorFragmentProcessor ? true : false; } |
| int hasCoverageFragmentProcessor() const { return fCoverageFragmentProcessor ? true : false; } |
| int numTotalFragmentProcessors() const { |
| return (this->hasColorFragmentProcessor() ? 1 : 0) + |
| (this->hasCoverageFragmentProcessor() ? 1 : 0); |
| } |
| |
| const GrXPFactory* getXPFactory() const { return fXPFactory; } |
| |
| GrFragmentProcessor* getColorFragmentProcessor() const { |
| return fColorFragmentProcessor.get(); |
| } |
| GrFragmentProcessor* getCoverageFragmentProcessor() const { |
| return fCoverageFragmentProcessor.get(); |
| } |
| bool usesVaryingCoords() const { |
| return (fColorFragmentProcessor && fColorFragmentProcessor->usesVaryingCoords()) || |
| (fCoverageFragmentProcessor && fCoverageFragmentProcessor->usesVaryingCoords()); |
| } |
| |
| /** |
| * 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; |
| std::unique_ptr<GrFragmentProcessor> fColorFragmentProcessor; |
| std::unique_ptr<GrFragmentProcessor> fCoverageFragmentProcessor; |
| bool fTrivial = true; |
| SkPMColor4f fColor = SK_PMColor4fWHITE; |
| SkDEBUGCODE(bool fAlive = true;) // Set false after moved from. |
| }; |
| |
| #endif |