gecko-dev/dom/canvas/CanvasImageCache.h

59 lines
1.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 CANVASIMAGECACHE_H_
#define CANVASIMAGECACHE_H_
#include "nsSize.h"
namespace mozilla {
namespace dom {
class Element;
class HTMLCanvasElement;
} // namespace dom
namespace gfx {
class SourceSurface;
} // namespace gfx
} // namespace mozilla
class imgIRequest;
namespace mozilla {
class CanvasImageCache {
typedef mozilla::gfx::SourceSurface SourceSurface;
public:
/**
* Notify that image element aImage was (or is about to be) drawn to aCanvas
* using the first frame of aRequest's image. The data for the surface is
* in aSurface, and the image size is in aSize.
*/
static void NotifyDrawImage(dom::Element* aImage,
dom::HTMLCanvasElement* aCanvas,
imgIRequest* aRequest,
SourceSurface* aSource,
const gfxIntSize& aSize);
/**
* Check whether aImage has recently been drawn into aCanvas. If we return
* a non-null surface, then the image was recently drawn into the canvas
* (with the same image request) and the returned surface contains the image
* data, and the image size will be returned in aSize.
*/
static SourceSurface* Lookup(dom::Element* aImage,
dom::HTMLCanvasElement* aCanvas,
gfxIntSize* aSize);
/**
* This is the same as Lookup, except it works on any image recently drawn
* into any canvas. Security checks need to be done again if using the
* results from this.
*/
static SourceSurface* SimpleLookup(dom::Element* aImage);
};
}
#endif /* CANVASIMAGECACHE_H_ */