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diff --git a/layout/base/SurfaceFromElementResult.h b/layout/base/SurfaceFromElementResult.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_SurfaceFromElementResult_h
+#define mozilla_SurfaceFromElementResult_h
+
+#include "ImageContainer.h"
+#include "gfxTypes.h"
+#include "mozilla/gfx/Point.h"
+#include "nsCOMPtr.h"
+#include <cstdint>
+
+class imgIContainer;
+class imgIRequest;
+class nsIPrincipal;
+class nsLayoutUtils;
+
+namespace mozilla {
+
+namespace dom {
+class CanvasRenderingContext2D;
+}
+
+namespace gfx {
+class SourceSurface;
+}
+
+struct DirectDrawInfo {
+ /* imgIContainer to directly draw to a context */
+ nsCOMPtr<imgIContainer> mImgContainer;
+ /* which frame to draw */
+ uint32_t mWhichFrame;
+ /* imgIContainer flags to use when drawing */
+ uint32_t mDrawingFlags;
+};
+
+struct SurfaceFromElementResult {
+ friend class mozilla::dom::CanvasRenderingContext2D;
+ friend class ::nsLayoutUtils;
+
+ /* If SFEResult contains a valid surface, it either mLayersImage or
+ * mSourceSurface will be non-null, and GetSourceSurface() will not be null.
+ *
+ * For valid surfaces, mSourceSurface may be null if mLayersImage is
+ * non-null, but GetSourceSurface() will create mSourceSurface from
+ * mLayersImage when called.
+ */
+
+ /* Video elements (at least) often are already decoded as layers::Images. */
+ RefPtr<mozilla::layers::Image> mLayersImage;
+
+ protected:
+ /* GetSourceSurface() fills this and returns its non-null value if this
+ * SFEResult was successful. */
+ RefPtr<mozilla::gfx::SourceSurface> mSourceSurface;
+
+ public:
+ /* Contains info for drawing when there is no mSourceSurface. */
+ DirectDrawInfo mDrawInfo;
+
+ /* The size of the surface */
+ mozilla::gfx::IntSize mSize;
+ /* The size the surface is intended to be rendered at */
+ mozilla::gfx::IntSize mIntrinsicSize;
+ /* The principal associated with the element whose surface was returned.
+ If there is a surface, this will never be null. */
+ nsCOMPtr<nsIPrincipal> mPrincipal;
+ /* The image request, if the element is an nsIImageLoadingContent */
+ nsCOMPtr<imgIRequest> mImageRequest;
+ /* True if cross-origins redirects have been done in order to load this
+ * resource */
+ bool mHadCrossOriginRedirects;
+ /* Whether the element was "write only", that is, the bits should not be
+ * exposed to content */
+ bool mIsWriteOnly;
+ /* Whether the element was still loading. Some consumers need to handle
+ this case specially. */
+ bool mIsStillLoading;
+ /* Whether the element has a valid size. */
+ bool mHasSize;
+ /* Whether the element used CORS when loading. */
+ bool mCORSUsed;
+
+ gfxAlphaType mAlphaType;
+
+ // Methods:
+
+ SurfaceFromElementResult();
+
+ // Gets mSourceSurface, or makes a SourceSurface from mLayersImage.
+ const RefPtr<mozilla::gfx::SourceSurface>& GetSourceSurface();
+};
+
+} // namespace mozilla
+
+#endif // mozilla_SurfaceFromElementResult_h