GrOnFlushResourceProvider.h

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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 GrOnFlushResourceProvider_DEFINED
#define GrOnFlushResourceProvider_DEFINED
 
#include "include/core/SkSpan.h"
#include "src/gpu/ganesh/GrDeferredUpload.h"
 
class GrCaps;
class GrDrawingManager;
class GrOnFlushResourceProvider;
class GrSurfaceProxy;
 
/*
 * This is the base class from which all pre-flush callback objects must be derived. It
 * provides the "preFlush" / "postFlush" interface.
 */
class GrOnFlushCallbackObject {
public:
    virtual ~GrOnFlushCallbackObject() {}
 
    /*
     * The preFlush callback allows subsystems (e.g., text, path renderers) to create atlases
     * for a specific flush.
     *
     * Returns true on success; false on memory allocation failure
     */
    virtual bool preFlush(GrOnFlushResourceProvider*) = 0;
 
    /**
     * Called once flushing is complete. startTokenForNextFlush can be used to track resources
     * used in the current flush.
     */
    virtual void postFlush(skgpu::AtlasToken startTokenForNextFlush) {}
 
    /**
     * Tells the callback owner to hold onto this object when freeing GPU resources.
     */
    virtual bool retainOnFreeGpuResources() { return false; }
};
 
/*
 * This class is a shallow wrapper around the drawing manager. It is passed into the
 * onFlush callbacks and is intended to limit the functionality available to them.
 * It should never have additional data members or virtual methods.
 */
class GrOnFlushResourceProvider {
public:
    explicit GrOnFlushResourceProvider(GrDrawingManager* drawingMgr) : fDrawingMgr(drawingMgr) {}
 
    [[nodiscard]] bool instantiateProxy(GrSurfaceProxy*);
 
    const GrCaps* caps() const;
 
#if defined(GR_TEST_UTILS)
    bool failFlushTimeCallbacks() const;
#endif
 
private:
    GrOnFlushResourceProvider(const GrOnFlushResourceProvider&) = delete;
    GrOnFlushResourceProvider& operator=(const GrOnFlushResourceProvider&) = delete;
 
    GrDrawingManager* fDrawingMgr;
};
 
#endif