1 files changed, 99 insertions, 0 deletions
diff --git a/layout/base/SurfaceFromElementResult.h b/layout/base/SurfaceFromElementResult.h
new file mode 100644
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+++ 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