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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), fDeviceBounds(SkRect::MakeLargest()) {}
GrFragmentProcessor* getClipCoverageFragmentProcessor() const {
return fClipCoverageFP.get();
}
const GrScissorState& scissorState() const { return fScissorState; }
bool hasStencilClip() const { return fHasStencilClip; }
void makeStencil(bool hasStencil, const SkRect& deviceBounds) {
fClipCoverageFP = nullptr;
fScissorState.setDisabled();
fHasStencilClip = hasStencil;
fDeviceBounds = deviceBounds;
}
/**
* The device bounds of the clip defaults to the scissor rect, but a tighter bounds (based
* on the known effect of the stencil values) can be provided.
*/
void makeScissoredStencil(const SkIRect& scissor, const SkRect* deviceBounds = nullptr) {
fClipCoverageFP = nullptr;
fScissorState.set(scissor);
fHasStencilClip = true;
if (deviceBounds) {
fDeviceBounds = *deviceBounds;
SkASSERT(scissor.contains(*deviceBounds))
} else {
fDeviceBounds = SkRect::Make(scissor);
}
}
void makeFPBased(sk_sp<GrFragmentProcessor> fp, const SkRect& deviceBounds) {
fClipCoverageFP = fp;
fScissorState.setDisabled();
fHasStencilClip = false;
fDeviceBounds = deviceBounds;
}
void makeScissored(SkIRect& scissor) {
fClipCoverageFP.reset();
fScissorState.set(scissor);
fHasStencilClip = false;
fDeviceBounds = SkRect::Make(scissor);
}
/**
* The device bounds of the clip defaults to the scissor rect, but a tighter bounds (based
* on the known effect of the fragment processor) can be provided.
*/
void makeScissoredFPBased(sk_sp<GrFragmentProcessor> fp, const SkIRect& scissor,
const SkRect* deviceBounds = nullptr) {
fClipCoverageFP = fp;
fScissorState.set(scissor);
fHasStencilClip = false;
if (deviceBounds) {
fDeviceBounds = *deviceBounds;
SkASSERT(scissor.contains(*deviceBounds))
} else {
fDeviceBounds = SkRect::Make(scissor);
}
}
/**
* Returns the device bounds of the applied clip. Ideally this considers the combined effect of
* all clipping techniques in play (scissor, stencil, and/or coverage fp).
*/
const SkRect& deviceBounds() const { return fDeviceBounds; }
private:
sk_sp<GrFragmentProcessor> fClipCoverageFP;
GrScissorState fScissorState;
bool fHasStencilClip;
SkRect fDeviceBounds;
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() : fDeviceBounds(SkRect::MakeLargest()), fHasStencilClip(false) {}
GrFixedClip(const SkIRect& scissorRect)
: fScissorState(scissorRect)
, fDeviceBounds(SkRect::Make(scissorRect))
, fHasStencilClip(false) {}
void reset() {
fScissorState.setDisabled();
fDeviceBounds.setLargest();
fHasStencilClip = false;
}
void reset(const SkIRect& scissorRect) {
fScissorState.set(scissorRect);
fDeviceBounds = SkRect::Make(scissorRect);
fHasStencilClip = false;
}
/**
* Enables stenciling. The stencil bounds is the device space bounds where the stencil test
* may pass.
*/
void enableStencilClip(const SkRect& stencilBounds) {
fHasStencilClip = true;
fDeviceBounds = stencilBounds;
if (fScissorState.enabled()) {
const SkIRect& s = fScissorState.rect();
fDeviceBounds.fLeft = SkTMax(fDeviceBounds.fLeft, SkIntToScalar(s.fLeft));
fDeviceBounds.fTop = SkTMax(fDeviceBounds.fTop, SkIntToScalar(s.fTop));
fDeviceBounds.fRight = SkTMin(fDeviceBounds.fRight, SkIntToScalar(s.fRight));
fDeviceBounds.fBottom = SkTMin(fDeviceBounds.fBottom, SkIntToScalar(s.fBottom));
}
}
void disableStencilClip() {
fHasStencilClip = false;
if (fScissorState.enabled()) {
fDeviceBounds = SkRect::Make(fScissorState.rect());
} else {
fDeviceBounds.setLargest();
}
}
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;
SkRect fDeviceBounds;
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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