dom/canvas/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 #include "mozilla/RefPtr.h"
  10 #include "nsSize.h"
  11
  12 namespace mozilla {
  13 namespace dom {
  14 class Element;
  15 class HTMLCanvasElement;
  16 }  // namespace dom
  17 namespace gfx {
  18 class SourceSurface;
  19 }  // namespace gfx
  20 }  // namespace mozilla
  21 class imgIContainer;
  22
  23 namespace mozilla {
  24
  25 class CanvasImageCache {
  26   typedef mozilla::gfx::SourceSurface SourceSurface;
  27
  28  public:
  29   /**
  30    * Notify that image element aImage was drawn to aCanvas element
  31    * using the first frame of aRequest's image. The data for the surface is
  32    * in aSurface, and the image size is in aSize. aIntrinsicSize is the size
  33    * the surface is intended to be rendered at.
  34    */
  35   static void NotifyDrawImage(dom::Element* aImage,
  36                               dom::HTMLCanvasElement* aCanvas,
  37                               SourceSurface* aSource, const gfx::IntSize& aSize,
  38                               const gfx::IntSize& aIntrinsicSize);
  39
  40   /**
  41    * Check whether aImage has recently been drawn any canvas. If we return
  42    * a non-null surface, then the same image was recently drawn into a canvas.
  43    */
  44   static SourceSurface* LookupAllCanvas(dom::Element* aImage);
  45
  46   /**
  47    * Like the top above, but restricts the lookup to only aCanvas. This is
  48    * required for CORS security.
  49    */
  50   static SourceSurface* LookupCanvas(dom::Element* aImage,
  51                                      dom::HTMLCanvasElement* aCanvas,
  52                                      gfx::IntSize* aSizeOut,
  53                                      gfx::IntSize* aIntrinsicSizeOut);
  54 };
  55
  56 }  // namespace mozilla
  57
  58 #endif /* CANVASIMAGECACHE_H_ */