1 files changed, 98 insertions, 0 deletions
diff --git a/image/ClippedImage.h b/image/ClippedImage.h
new file mode 100644
index 0000000000..43295a53f6
--- /dev/null
+++ b/image/ClippedImage.h
@@ -0,0 +1,98 @@
+/* -*- 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 mozilla_image_ClippedImage_h
+#define mozilla_image_ClippedImage_h
+
+#include "ImageWrapper.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+
+#include <utility>
+
+namespace mozilla {
+namespace image {
+
+class ClippedImageCachedSurface;
+class DrawSingleTileCallback;
+
+/**
+ * An Image wrapper that clips an image against a rectangle. Right now only
+ * absolute coordinates in pixels are supported.
+ *
+ * XXX(seth): There a known (performance, not correctness) issue with
+ * GetImageContainer. See the comments for that method for more information.
+ */
+class ClippedImage : public ImageWrapper {
+  typedef gfx::SourceSurface SourceSurface;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(ClippedImage, ImageWrapper)
+
+  NS_IMETHOD GetWidth(int32_t* aWidth) override;
+  NS_IMETHOD GetHeight(int32_t* aHeight) override;
+  NS_IMETHOD GetIntrinsicSize(nsSize* aSize) override;
+  Maybe<AspectRatio> GetIntrinsicRatio() override;
+  NS_IMETHOD_(already_AddRefed<SourceSurface>)
+  GetFrame(uint32_t aWhichFrame, uint32_t aFlags) override;
+  NS_IMETHOD_(already_AddRefed<SourceSurface>)
+  GetFrameAtSize(const gfx::IntSize& aSize, uint32_t aWhichFrame,
+                 uint32_t aFlags) override;
+  NS_IMETHOD_(bool)
+  IsImageContainerAvailable(WindowRenderer* aRenderer,
+                            uint32_t aFlags) override;
+  NS_IMETHOD_(ImgDrawResult)
+  GetImageProvider(WindowRenderer* aRenderer, const gfx::IntSize& aSize,
+                   const SVGImageContext& aSVGContext,
+                   const Maybe<ImageIntRegion>& aRegion, uint32_t aFlags,
+                   WebRenderImageProvider** aProvider) override;
+  NS_IMETHOD_(ImgDrawResult)
+  Draw(gfxContext* aContext, const nsIntSize& aSize, const ImageRegion& aRegion,
+       uint32_t aWhichFrame, gfx::SamplingFilter aSamplingFilter,
+       const SVGImageContext& aSVGContext, uint32_t aFlags,
+       float aOpacity) override;
+  NS_IMETHOD RequestDiscard() override;
+  NS_IMETHOD_(Orientation) GetOrientation() override;
+  NS_IMETHOD_(nsIntRect)
+  GetImageSpaceInvalidationRect(const nsIntRect& aRect) override;
+  nsIntSize OptimalImageSizeForDest(const gfxSize& aDest, uint32_t aWhichFrame,
+                                    gfx::SamplingFilter aSamplingFilter,
+                                    uint32_t aFlags) override;
+
+ protected:
+  ClippedImage(Image* aImage, nsIntRect aClip,
+               const Maybe<nsSize>& aSVGViewportSize);
+
+  virtual ~ClippedImage();
+
+ private:
+  std::pair<ImgDrawResult, RefPtr<SourceSurface>> GetFrameInternal(
+      const nsIntSize& aSize, const SVGImageContext& aSVGContext,
+      const Maybe<ImageIntRegion>& aRegion, uint32_t aWhichFrame,
+      uint32_t aFlags, float aOpacity);
+  bool ShouldClip();
+  ImgDrawResult DrawSingleTile(gfxContext* aContext, const nsIntSize& aSize,
+                               const ImageRegion& aRegion, uint32_t aWhichFrame,
+                               gfx::SamplingFilter aSamplingFilter,
+                               const SVGImageContext& aSVGContext,
+                               uint32_t aFlags, float aOpacity);
+
+  // If we are forced to draw a temporary surface, we cache it here.
+  UniquePtr<ClippedImageCachedSurface> mCachedSurface;
+
+  nsIntRect mClip;                    // The region to clip to.
+  Maybe<bool> mShouldClip;            // Memoized ShouldClip() if present.
+  Maybe<nsIntSize> mSVGViewportSize;  // If we're clipping a VectorImage, this
+                                      // is the size of viewport of that image.
+  friend class DrawSingleTileCallback;
+  friend class ImageOps;
+};
+
+}  // namespace image
+}  // namespace mozilla
+
+#endif  // mozilla_image_ClippedImage_h