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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrClip_DEFINED
#define GrClip_DEFINED
#include "GrFragmentProcessor.h"
#include "GrTypesPriv.h"
#include "SkClipStack.h"
class GrDrawContext;
class GrPipelineBuilder;
/**
* Produced by GrClip. It provides a set of modifications to the drawing state that are used to
* create the final GrPipeline for a GrBatch.
*/
class GrAppliedClip : public SkNoncopyable {
public:
GrAppliedClip() : fHasStencilClip(false) {}
GrFragmentProcessor* getClipCoverageFragmentProcessor() const {
return fClipCoverageFP.get();
}
const GrScissorState& scissorState() const { return fScissorState; }
bool hasStencilClip() const { return fHasStencilClip; }
void makeStencil(bool hasStencil) {
fClipCoverageFP = nullptr;
fScissorState.setDisabled();
fHasStencilClip = hasStencil;
}
void makeScissoredStencil(bool hasStencil, const SkIRect& scissor) {
fClipCoverageFP = nullptr;
fScissorState.set(scissor);
fHasStencilClip = hasStencil;
}
void makeFPBased(sk_sp<GrFragmentProcessor> fp) {
fClipCoverageFP = fp;
fScissorState.setDisabled();
fHasStencilClip = false;
}
void makeScissoredFPBased(sk_sp<GrFragmentProcessor> fp, SkIRect& scissor) {
fClipCoverageFP = fp;
fScissorState.set(scissor);
fHasStencilClip = false;
}
private:
sk_sp<GrFragmentProcessor> fClipCoverageFP;
GrScissorState fScissorState;
bool fHasStencilClip;
typedef SkNoncopyable INHERITED;
};
/**
* GrClip is an abstract base class for applying a clip. It constructs a clip mask if necessary, and
* fills out a GrAppliedClip instructing the caller on how to set up the draw state.
*/
class GrClip {
public:
virtual bool quickContains(const SkRect&) const = 0;
virtual void getConservativeBounds(int width, int height, SkIRect* devResult,
bool* isIntersectionOfRects = nullptr) const = 0;
virtual bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*,
const SkRect* devBounds, GrAppliedClip*) const = 0;
virtual ~GrClip() {}
};
/**
* Specialized implementation for no clip.
*/
class GrNoClip final : public GrClip {
private:
bool quickContains(const SkRect&) const final { return true; }
void getConservativeBounds(int width, int height, SkIRect* devResult,
bool* isIntersectionOfRects) const final;
bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*,
const SkRect*, GrAppliedClip*) const final { return true; }
};
/**
* GrFixedClip is a clip that can be represented by fixed-function hardware. It never modifies the
* stencil buffer itself, but can be configured to use whatever clip is already there.
*/
class GrFixedClip final : public GrClip {
public:
GrFixedClip() : fHasStencilClip(false) {}
GrFixedClip(const SkIRect& scissorRect) : fScissorState(scissorRect), fHasStencilClip(false) {}
void reset() {
fScissorState.setDisabled();
fHasStencilClip = false;
}
void reset(const SkIRect& scissorRect) {
fScissorState.set(scissorRect);
fHasStencilClip = false;
}
void enableStencilClip(bool enable) { fHasStencilClip = enable; }
const GrScissorState& scissorState() const { return fScissorState; }
bool hasStencilClip() const { return fHasStencilClip; }
bool quickContains(const SkRect&) const final;
void getConservativeBounds(int width, int height, SkIRect* devResult,
bool* isIntersectionOfRects) const final;
private:
bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*,
const SkRect* devBounds, GrAppliedClip* out) const final;
GrScissorState fScissorState;
bool fHasStencilClip;
};
/**
* GrClipStackClip can apply a generic SkClipStack to the draw state. It may generate clip masks or
* write to the stencil buffer during apply().
*/
class GrClipStackClip final : public GrClip {
public:
GrClipStackClip(const SkClipStack* stack = nullptr, const SkIPoint* origin = nullptr) {
this->reset(stack, origin);
}
void reset(const SkClipStack* stack = nullptr, const SkIPoint* origin = nullptr) {
fOrigin = origin ? *origin : SkIPoint::Make(0, 0);
fStack.reset(SkSafeRef(stack));
}
const SkIPoint& origin() const { return fOrigin; }
const SkClipStack* clipStack() const { return fStack; }
bool quickContains(const SkRect&) const final;
void getConservativeBounds(int width, int height, SkIRect* devResult,
bool* isIntersectionOfRects) const final;
bool apply(GrContext*, const GrPipelineBuilder&, GrDrawContext*,
const SkRect* devBounds, GrAppliedClip*) const final;
private:
SkIPoint fOrigin;
SkAutoTUnref<const SkClipStack> fStack;
};
#endif
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