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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 "GrCCPerOpListPaths.h"
#include "GrPathRenderer.h"
#include "GrRenderTargetOpList.h"
#include "ccpr/GrCCPerFlushResources.h"
#include <map>
class GrCCDrawPathsOp;
/**
* 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 {
// Ensure callers are actually flushing paths they record, not causing us to leak memory.
SkASSERT(fPendingPaths.empty());
SkASSERT(!fFlushing);
}
using PendingPathsMap = std::map<uint32_t, sk_sp<GrCCPerOpListPaths>>;
// In DDL mode, Ganesh needs to be able to move the pending GrCCPerOpListPaths to the DDL object
// (detachPendingPaths) and then return them upon replay (mergePendingPaths).
PendingPathsMap detachPendingPaths() { return std::move(fPendingPaths); }
void mergePendingPaths(const PendingPathsMap& paths) {
#ifdef SK_DEBUG
// Ensure there are no duplicate opList IDs between the incoming path map and ours.
// This should always be true since opList IDs are globally unique and these are coming
// from different DDL recordings.
for (const auto& it : paths) {
SkASSERT(!fPendingPaths.count(it.first));
}
#endif
fPendingPaths.insert(paths.begin(), paths.end());
}
// 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;
private:
GrCoverageCountingPathRenderer(bool drawCachablePaths)
: fDrawCachablePaths(drawCachablePaths) {}
GrCCPerOpListPaths* lookupPendingPaths(uint32_t opListID);
void adoptAndRecordOp(GrCCDrawPathsOp*, const DrawPathArgs&);
// fPendingPaths holds the GrCCPerOpListPaths objects that have already been created, but not
// flushed, and those that are still being created. All GrCCPerOpListPaths objects will first
// reside in fPendingPaths, then be moved to fFlushingPaths during preFlush().
PendingPathsMap fPendingPaths;
// fFlushingPaths holds the GrCCPerOpListPaths objects that are currently being flushed.
// (It will only contain elements when fFlushing is true.)
SkSTArray<4, sk_sp<GrCCPerOpListPaths>> fFlushingPaths;
SkDEBUGCODE(bool fFlushing = false);
const bool fDrawCachablePaths;
};
#endif
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