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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_CANVASRENDERER_H
#define GFX_CANVASRENDERER_H
#include <memory> // for weak_ptr
#include <stdint.h> // for uint32_t
#include "GLContextTypes.h" // for GLContext
#include "gfxContext.h" // for gfxContext, etc
#include "gfxTypes.h"
#include "gfxPlatform.h" // for gfxImageFormat
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/Preferences.h" // for Preferences
#include "mozilla/RefPtr.h" // for RefPtr
#include "mozilla/gfx/2D.h" // for DrawTarget
#include "mozilla/mozalloc.h" // for operator delete, etc
#include "mozilla/WeakPtr.h" // for WeakPtr
#include "nsISupportsImpl.h" // for MOZ_COUNT_CTOR, etc
#include "nsICanvasRenderingContextInternal.h"
namespace mozilla {
namespace layers {
class KnowsCompositor;
class PersistentBufferProvider;
class WebRenderCanvasRendererAsync;
TextureType TexTypeForWebgl(KnowsCompositor*);
struct CanvasRendererData final {
CanvasRendererData();
~CanvasRendererData();
WeakPtr<nsICanvasRenderingContextInternal> mContext;
// The size of the canvas content
gfx::IntSize mSize = {0, 0};
bool mDoPaintCallbacks = false;
bool mIsOpaque = true;
bool mIsAlphaPremult = true;
gl::OriginPos mOriginPos = gl::OriginPos::TopLeft;
nsICanvasRenderingContextInternal* GetContext() const {
return mContext.get();
}
};
// Based class which used for canvas rendering. There are many derived classes
// for different purposes. such as:
//
// ShareableCanvasRenderer provides IPC capabilities that allow sending canvas
// content over IPC. This is pure virtual class because the IPC handling is
// different in different LayerManager. So that we have following classes
// inherit ShareableCanvasRenderer.
//
// WebRenderCanvasRenderer inherits ShareableCanvasRenderer and provides all
// functionality that WebRender uses.
// WebRenderCanvasRendererAsync inherits WebRenderCanvasRenderer and be used in
// layers-free mode of WebRender.
//
// class diagram:
//
// +--------------+
// |CanvasRenderer|
// +-------+------+
// ^
// |
// +-----------+-----------+
// |ShareableCanvasRenderer|
// +-----+-----------------+
// ^
// |
// +-----------+-----------+
// |WebRenderCanvasRenderer|
// +-----------+-----------+
// ^
// |
// +-------------+--------------+
// |WebRenderCanvasRendererAsync|
// +----------------------------+
class BorrowedSourceSurface final {
public:
const WeakPtr<PersistentBufferProvider> mReturnTo;
const RefPtr<gfx::SourceSurface> mSurf; /// non-null
BorrowedSourceSurface(PersistentBufferProvider*, RefPtr<gfx::SourceSurface>);
~BorrowedSourceSurface();
};
// -
class CanvasRenderer : public RefCounted<CanvasRenderer> {
friend class CanvasRendererSourceSurface;
public:
MOZ_DECLARE_REFCOUNTED_TYPENAME(CanvasRenderer)
private:
bool mDirty = false;
protected:
CanvasRendererData mData;
public:
explicit CanvasRenderer();
virtual ~CanvasRenderer();
public:
virtual void Initialize(const CanvasRendererData&);
virtual bool IsDataValid(const CanvasRendererData&) const;
virtual void ClearCachedResources() {}
virtual void DisconnectClient() {}
const gfx::IntSize& GetSize() const { return mData.mSize; }
bool IsOpaque() const { return mData.mIsOpaque; }
bool YIsDown() const { return mData.mOriginPos == gl::OriginPos::TopLeft; }
void SetDirty() { mDirty = true; }
void ResetDirty() { mDirty = false; }
bool IsDirty() const { return mDirty; }
virtual WebRenderCanvasRendererAsync* AsWebRenderCanvasRendererAsync() {
return nullptr;
}
std::shared_ptr<BorrowedSourceSurface> BorrowSnapshot(
bool requireAlphaPremult = true) const;
void FirePreTransactionCallback() const;
void FireDidTransactionCallback() const;
};
} // namespace layers
} // namespace mozilla
#endif