GrImageContext.h

Go to the documentation of this file.

/*
 * Copyright 2019 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef GrImageContext_DEFINED
#define GrImageContext_DEFINED
 
#include "include/core/SkRefCnt.h"
#include "include/private/base/SingleOwner.h"
#include "include/private/base/SkAPI.h"
#include "include/private/gpu/ganesh/GrContext_Base.h"
 
class GrContextThreadSafeProxy;
class GrImageContextPriv;
 
// This is now just a view on a ThreadSafeProxy, that SkImages can attempt to
// downcast to a GrDirectContext as a backdoor to some operations. Once we remove the backdoors,
// this goes away and SkImages just hold ThreadSafeProxies.
class GrImageContext : public GrContext_Base {
public:
    ~GrImageContext() override;
 
    // Provides access to functions that aren't part of the public API.
    GrImageContextPriv priv();
    const GrImageContextPriv priv() const;  // NOLINT(readability-const-return-type)
 
protected:
    friend class GrImageContextPriv; // for hidden functions
 
    GrImageContext(sk_sp<GrContextThreadSafeProxy>);
 
    SK_API virtual void abandonContext();
    SK_API virtual bool abandoned();
 
    /** This is only useful for debug purposes */
    skgpu::SingleOwner* singleOwner() const { return &fSingleOwner; }
 
    GrImageContext* asImageContext() override { return this; }
 
private:
    // When making promise images, we currently need a placeholder GrImageContext instance to give
    // to the SkImage that has no real power, just a wrapper around the ThreadSafeProxy.
    // TODO: De-power SkImage to ThreadSafeProxy or at least figure out a way to share one instance.
    static sk_sp<GrImageContext> MakeForPromiseImage(sk_sp<GrContextThreadSafeProxy>);
 
    // In debug builds we guard against improper thread handling
    // This guard is passed to the GrDrawingManager and, from there to all the
    // GrSurfaceDrawContexts.  It is also passed to the GrResourceProvider and SkGpuDevice.
    // TODO: Move this down to GrRecordingContext.
    mutable skgpu::SingleOwner fSingleOwner;
};
 
#endif