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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrAppliedClip_DEFINED
#define GrAppliedClip_DEFINED
#include "GrFragmentProcessor.h"
#include "GrScissorState.h"
#include "GrWindowRectsState.h"
#include "SkClipStack.h"
/**
* Produced by GrClip. It provides a set of modifications to the drawing state that are used to
* create the final GrPipeline for a GrOp.
*/
class GrAppliedClip {
public:
GrAppliedClip() = default;
GrAppliedClip(GrAppliedClip&& that) = default;
GrAppliedClip(const GrAppliedClip&) = delete;
const GrScissorState& scissorState() const { return fScissorState; }
const GrWindowRectsState& windowRectsState() const { return fWindowRectsState; }
int numClipCoverageFragmentProcessors() const { return fClipCoverageFPs.count(); }
const GrFragmentProcessor* clipCoverageFragmentProcessor(int i) const {
SkASSERT(fClipCoverageFPs[i]);
return fClipCoverageFPs[i].get();
}
std::unique_ptr<const GrFragmentProcessor> detachClipCoverageFragmentProcessor(int i) {
SkASSERT(fClipCoverageFPs[i]);
return std::move(fClipCoverageFPs[i]);
}
bool hasStencilClip() const { return SkClipStack::kInvalidGenID != fClipStackID; }
/**
* Intersects the applied clip with the provided rect. Returns false if the draw became empty.
* 'clippedDrawBounds' will be intersected with 'irect'. This returns false if the clip becomes
* empty or the draw no longer intersects the clip. In either case the draw can be skipped.
*/
bool addScissor(const SkIRect& irect, SkRect* clippedDrawBounds) {
return fScissorState.intersect(irect) && clippedDrawBounds->intersect(SkRect::Make(irect));
}
void addWindowRectangles(const GrWindowRectsState& windowState) {
SkASSERT(!fWindowRectsState.enabled());
fWindowRectsState = windowState;
}
void addWindowRectangles(const GrWindowRectangles& windows, GrWindowRectsState::Mode mode) {
SkASSERT(!fWindowRectsState.enabled());
fWindowRectsState.set(windows, mode);
}
void addCoverageFP(std::unique_ptr<GrFragmentProcessor> fp) {
SkASSERT(fp);
fClipCoverageFPs.push_back(std::move(fp));
}
void addStencilClip(uint32_t clipStackID) {
SkASSERT(SkClipStack::kInvalidGenID == fClipStackID);
fClipStackID = clipStackID;
}
bool doesClip() const {
return fScissorState.enabled() || !fClipCoverageFPs.empty() || this->hasStencilClip() ||
fWindowRectsState.enabled();
}
bool operator==(const GrAppliedClip& that) const {
if (fScissorState != that.fScissorState ||
fWindowRectsState != that.fWindowRectsState ||
fClipCoverageFPs.count() != that.fClipCoverageFPs.count() ||
fClipStackID != that.fClipStackID) {
return false;
}
for (int i = 0; i < fClipCoverageFPs.count(); ++i) {
if (!fClipCoverageFPs[i] || !that.fClipCoverageFPs[i]) {
if (fClipCoverageFPs[i] == that.fClipCoverageFPs[i]) {
continue; // Both are null.
}
return false;
}
if (!fClipCoverageFPs[i]->isEqual(*that.fClipCoverageFPs[i])) {
return false;
}
}
return true;
}
bool operator!=(const GrAppliedClip& that) const { return !(*this == that); }
void visitProxies(const std::function<void(GrSurfaceProxy*)>& func) const {
for (const std::unique_ptr<GrFragmentProcessor>& fp : fClipCoverageFPs) {
if (fp) { // This might be called after detach.
fp->visitProxies(func);
}
}
}
private:
GrScissorState fScissorState;
GrWindowRectsState fWindowRectsState;
SkSTArray<4, std::unique_ptr<GrFragmentProcessor>> fClipCoverageFPs;
uint32_t fClipStackID = SkClipStack::kInvalidGenID;
};
#endif
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