content/canvas/src/CanvasImageCache.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef CANVASIMAGECACHE_H_
   7 #define CANVASIMAGECACHE_H_
   8
   9 namespace mozilla {
  10 namespace dom {
  11 class Element;
  12 class HTMLCanvasElement;
  13 } // namespace dom
  14 } // namespace mozilla
  15 class imgIRequest;
  16 class gfxASurface;
  17
  18 #include "gfxPoint.h"
  19
  20 namespace mozilla {
  21
  22 class CanvasImageCache {
  23 public:
  24   /**
  25    * Notify that image element aImage was (or is about to be) drawn to aCanvas
  26    * using the first frame of aRequest's image. The data for the surface is
  27    * in aSurface, and the image size is in aSize.
  28    */
  29   static void NotifyDrawImage(dom::Element* aImage,
  30                               dom::HTMLCanvasElement* aCanvas,
  31                               imgIRequest* aRequest,
  32                               gfxASurface* aSurface,
  33                               const gfxIntSize& aSize);
  34
  35   /**
  36    * Check whether aImage has recently been drawn into aCanvas. If we return
  37    * a non-null surface, then the image was recently drawn into the canvas
  38    * (with the same image request) and the returned surface contains the image
  39    * data, and the image size will be returned in aSize.
  40    */
  41   static gfxASurface* Lookup(dom::Element* aImage,
  42                              dom::HTMLCanvasElement* aCanvas,
  43                              gfxIntSize* aSize);
  44 };
  45
  46 }
  47
  48 #endif /* CANVASIMAGECACHE_H_ */