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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrCoverageCountingPathRenderer_DEFINED
#define GrCoverageCountingPathRenderer_DEFINED
#include "GrPathRenderer.h"
#include "GrRenderTargetOpList.h"
#include "SkTInternalLList.h"
#include "ccpr/GrCCClipPath.h"
#include "ccpr/GrCCDrawPathsOp.h"
#include <map>
class GrCCPerFlushResources;
/**
* Tracks all the paths in a single render target that will be drawn at next flush.
*/
struct GrCCRTPendingPaths {
~GrCCRTPendingPaths() {
// Ensure there are no surviving DrawPathsOps with a dangling pointer into this class.
if (!fDrawOps.isEmpty()) {
SK_ABORT("GrCCDrawPathsOp(s) not deleted during flush");
}
// Clip lazy proxies also reference this class from their callbacks, but those callbacks
// are only invoked at flush time while we are still alive. (Unlike DrawPathsOps, that
// unregister themselves upon destruction.) So it shouldn't matter if any clip proxies
// are still around.
}
SkTInternalLList<GrCCDrawPathsOp> fDrawOps;
std::map<uint32_t, GrCCClipPath> fClipPaths;
GrSTAllocator<256, GrCCDrawPathsOp::SingleDraw> fDrawsAllocator;
};
/**
* This is a path renderer that draws antialiased paths by counting coverage in an offscreen
* buffer. (See GrCCCoverageProcessor, GrCCPathProcessor.)
*
* It also serves as the per-render-target tracker for pending path draws, and at the start of
* flush, it compiles GPU buffers and renders a "coverage count atlas" for the upcoming paths.
*/
class GrCoverageCountingPathRenderer : public GrPathRenderer, public GrOnFlushCallbackObject {
public:
static bool IsSupported(const GrCaps&);
static sk_sp<GrCoverageCountingPathRenderer> CreateIfSupported(const GrCaps&,
bool drawCachablePaths);
~GrCoverageCountingPathRenderer() override;
// GrPathRenderer overrides.
StencilSupport onGetStencilSupport(const GrShape&) const override {
return GrPathRenderer::kNoSupport_StencilSupport;
}
CanDrawPath onCanDrawPath(const CanDrawPathArgs& args) const override;
bool onDrawPath(const DrawPathArgs&) override;
std::unique_ptr<GrFragmentProcessor> makeClipProcessor(GrProxyProvider*, uint32_t oplistID,
const SkPath& deviceSpacePath,
const SkIRect& accessRect,
int rtWidth, int rtHeight);
// GrOnFlushCallbackObject overrides.
void preFlush(GrOnFlushResourceProvider*, const uint32_t* opListIDs, int numOpListIDs,
SkTArray<sk_sp<GrRenderTargetContext>>* atlasDraws) override;
void postFlush(GrDeferredUploadToken, const uint32_t* opListIDs, int numOpListIDs) override;
#ifdef SK_DEBUG
bool isFlushing_debugOnly() const { return fFlushing; }
void incrDrawOpCount_debugOnly() { ++fNumOutstandingDrawOps; }
void decrDrawOpCount_debugOnly() { --fNumOutstandingDrawOps; }
#endif
private:
GrCoverageCountingPathRenderer(bool drawCachablePaths);
GrCCRTPendingPaths* lookupRTPendingPaths(GrRenderTargetOpList* opList) {
SkASSERT(!fFlushing);
return &fRTPendingPathsMap[opList->uniqueID()];
}
const GrCCPerFlushResources* getPerFlushResources() const {
SkASSERT(fFlushing);
return fPerFlushResources.get();
}
std::map<uint32_t, GrCCRTPendingPaths> fRTPendingPathsMap;
SkSTArray<4, std::map<uint32_t, GrCCRTPendingPaths>::iterator> fFlushingRTPathIters;
std::unique_ptr<GrCCPerFlushResources> fPerFlushResources;
SkDEBUGCODE(bool fFlushing = false);
SkDEBUGCODE(int fNumOutstandingDrawOps = 0);
const bool fDrawCachablePaths;
friend void GrCCDrawPathsOp::wasRecorded(GrRenderTargetOpList*); // For lookupRTPendingPaths.
friend void GrCCDrawPathsOp::onExecute(GrOpFlushState*); // For getPerFlushResources.
};
#endif
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