michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef CANVASIMAGECACHE_H_
michael@0: #define CANVASIMAGECACHE_H_
michael@0: 
michael@0: #include "nsSize.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: class Element;
michael@0: class HTMLCanvasElement;
michael@0: } // namespace dom
michael@0: namespace gfx {
michael@0: class SourceSurface;
michael@0: } // namespace gfx
michael@0: } // namespace mozilla
michael@0: class imgIRequest;
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: class CanvasImageCache {
michael@0:   typedef mozilla::gfx::SourceSurface SourceSurface;
michael@0: public:
michael@0:   /**
michael@0:    * Notify that image element aImage was (or is about to be) drawn to aCanvas
michael@0:    * using the first frame of aRequest's image. The data for the surface is
michael@0:    * in aSurface, and the image size is in aSize.
michael@0:    */
michael@0:   static void NotifyDrawImage(dom::Element* aImage,
michael@0:                               dom::HTMLCanvasElement* aCanvas,
michael@0:                               imgIRequest* aRequest,
michael@0:                               SourceSurface* aSource,
michael@0:                               const gfxIntSize& aSize);
michael@0: 
michael@0:   /**
michael@0:    * Check whether aImage has recently been drawn into aCanvas. If we return
michael@0:    * a non-null surface, then the image was recently drawn into the canvas
michael@0:    * (with the same image request) and the returned surface contains the image
michael@0:    * data, and the image size will be returned in aSize.
michael@0:    */
michael@0:   static SourceSurface* Lookup(dom::Element* aImage,
michael@0:                                dom::HTMLCanvasElement* aCanvas,
michael@0:                                gfxIntSize* aSize);
michael@0: };
michael@0: 
michael@0: }
michael@0: 
michael@0: #endif /* CANVASIMAGECACHE_H_ */