1 files changed, 62 insertions, 0 deletions
diff --git a/dom/canvas/CanvasImageCache.h b/dom/canvas/CanvasImageCache.h
new file mode 100644
index 0000000000..58486c5a8d
--- /dev/null
+++ b/dom/canvas/CanvasImageCache.h
@@ -0,0 +1,62 @@
+/* -*- 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 "mozilla/RefPtr.h"
+#include "nsSize.h"
+
+namespace mozilla {
+namespace dom {
+class Element;
+class HTMLCanvasElement;
+}  // namespace dom
+namespace gfx {
+class DrawTarget;
+class SourceSurface;
+}  // namespace gfx
+}  // namespace mozilla
+class imgIContainer;
+
+namespace mozilla {
+
+class CanvasImageCache {
+  using SourceSurface = mozilla::gfx::SourceSurface;
+
+ public:
+  /**
+   * Notify that image element aImage was drawn to aCanvas element
+   * using the first frame of aRequest's image. The data for the surface is
+   * in aSurface, and the image size is in aSize. aIntrinsicSize is the size
+   * the surface is intended to be rendered at.
+   */
+  static void NotifyDrawImage(dom::Element* aImage,
+                              dom::HTMLCanvasElement* aCanvas,
+                              gfx::DrawTarget* aTarget, SourceSurface* aSource,
+                              const gfx::IntSize& aSize,
+                              const gfx::IntSize& aIntrinsicSize);
+
+  /**
+   * Check whether aImage has recently been drawn any canvas. If we return
+   * a non-null surface, then the same image was recently drawn into a canvas.
+   */
+  static SourceSurface* LookupAllCanvas(dom::Element* aImage,
+                                        gfx::DrawTarget* aTarget);
+
+  /**
+   * Like the top above, but restricts the lookup to only aCanvas. This is
+   * required for CORS security.
+   */
+  static SourceSurface* LookupCanvas(dom::Element* aImage,
+                                     dom::HTMLCanvasElement* aCanvas,
+                                     gfx::DrawTarget* aTarget,
+                                     gfx::IntSize* aSizeOut,
+                                     gfx::IntSize* aIntrinsicSizeOut);
+};
+
+}  // namespace mozilla
+
+#endif /* CANVASIMAGECACHE_H_ */