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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 "GrAllocator.h"
#include "GrOnFlushResourceProvider.h"
#include "GrPathRenderer.h"
#include "SkTInternalLList.h"
#include "ccpr/GrCCPRAtlas.h"
#include "ccpr/GrCCPRCoverageOpsBuilder.h"
#include "ops/GrDrawOp.h"
#include <map>
/**
* This is a path renderer that draws antialiased paths by counting coverage in an offscreen
* buffer. (See GrCCPRCoverageProcessor, GrCCPRPathProcessor)
*
* 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 {
struct RTPendingOps;
public:
static bool IsSupported(const GrCaps&);
static sk_sp<GrCoverageCountingPathRenderer> CreateIfSupported(const GrCaps&);
// GrPathRenderer overrides.
StencilSupport onGetStencilSupport(const GrShape&) const override {
return GrPathRenderer::kNoSupport_StencilSupport;
}
bool onCanDrawPath(const CanDrawPathArgs& args) const override;
bool onDrawPath(const DrawPathArgs&) final;
// GrOnFlushCallbackObject overrides.
void preFlush(GrOnFlushResourceProvider*, const uint32_t* opListIDs, int numOpListIDs,
SkTArray<sk_sp<GrRenderTargetContext>>* results) override;
void postFlush() override;
// This is the Op that ultimately draws a path into its final destination, using the atlas we
// generate at flush time.
class DrawPathsOp : public GrDrawOp {
public:
DEFINE_OP_CLASS_ID
SK_DECLARE_INTERNAL_LLIST_INTERFACE(DrawPathsOp);
DrawPathsOp(GrCoverageCountingPathRenderer*, const DrawPathArgs&, GrColor);
// GrDrawOp overrides.
const char* name() const override { return "GrCoverageCountingPathRenderer::DrawPathsOp"; }
FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
RequiresDstTexture finalize(const GrCaps&, const GrAppliedClip*) override;
void wasRecorded(GrRenderTargetOpList*) override;
bool onCombineIfPossible(GrOp* other, const GrCaps& caps) override;
void onPrepare(GrOpFlushState*) override {}
void onExecute(GrOpFlushState*) override;
private:
SkPath::FillType getFillType() const {
SkASSERT(fDebugInstanceCount >= 1);
return fHeadDraw.fPath.getFillType();
}
struct SingleDraw {
using ScissorMode = GrCCPRCoverageOpsBuilder::ScissorMode;
SkIRect fClipBounds;
ScissorMode fScissorMode;
SkMatrix fMatrix;
SkPath fPath;
GrColor fColor;
SingleDraw* fNext = nullptr;
};
SingleDraw& getOnlyPathDraw() {
SkASSERT(&fHeadDraw == fTailDraw);
SkASSERT(1 == fDebugInstanceCount);
return fHeadDraw;
}
struct AtlasBatch {
const GrCCPRAtlas* fAtlas;
int fEndInstanceIdx;
};
void addAtlasBatch(const GrCCPRAtlas* atlas, int endInstanceIdx) {
SkASSERT(endInstanceIdx > fBaseInstance);
SkASSERT(fAtlasBatches.empty() ||
endInstanceIdx > fAtlasBatches.back().fEndInstanceIdx);
fAtlasBatches.push_back() = {atlas, endInstanceIdx};
}
GrCoverageCountingPathRenderer* const fCCPR;
const uint32_t fSRGBFlags;
GrProcessorSet fProcessors;
SingleDraw fHeadDraw;
SingleDraw* fTailDraw;
RTPendingOps* fOwningRTPendingOps;
int fBaseInstance;
SkDEBUGCODE(int fDebugInstanceCount;)
SkSTArray<1, AtlasBatch, true> fAtlasBatches;
friend class GrCoverageCountingPathRenderer;
typedef GrDrawOp INHERITED;
};
private:
GrCoverageCountingPathRenderer() = default;
struct RTPendingOps {
SkTInternalLList<DrawPathsOp> fOpList;
GrCCPRCoverageOpsBuilder::MaxBufferItems fMaxBufferItems;
GrSTAllocator<256, DrawPathsOp::SingleDraw> fDrawsAllocator;
};
// Map from render target ID to the individual render target's pending path ops.
std::map<uint32_t, RTPendingOps> fRTPendingOpsMap;
sk_sp<GrBuffer> fPerFlushIndexBuffer;
sk_sp<GrBuffer> fPerFlushVertexBuffer;
sk_sp<GrBuffer> fPerFlushInstanceBuffer;
GrSTAllocator<4, GrCCPRAtlas> fPerFlushAtlases;
SkDEBUGCODE(bool fFlushing = false;)
};
#endif
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