1 files changed, 109 insertions, 0 deletions
diff --git a/image/OrientedImage.h b/image/OrientedImage.h
new file mode 100644
index 0000000000..a912174b42
--- /dev/null
+++ b/image/OrientedImage.h
@@ -0,0 +1,109 @@
+/* -*- 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_OrientedImage_h
+#define mozilla_image_OrientedImage_h
+
+#include "ImageWrapper.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/RefPtr.h"
+#include "Orientation.h"
+
+namespace mozilla {
+namespace image {
+
+/**
+ * An Image wrapper that rotates and/or flips an image according to a specified
+ * Orientation.
+ *
+ * XXX(seth): There a known (performance, not correctness) issue with
+ * GetImageContainer. See the comments for that method for more information.
+ */
+class OrientedImage : public ImageWrapper {
+  typedef gfx::SourceSurface SourceSurface;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(OrientedImage, ImageWrapper)
+
+  NS_IMETHOD GetWidth(int32_t* aWidth) override;
+  NS_IMETHOD GetHeight(int32_t* aHeight) override;
+  nsresult GetNativeSizes(nsTArray<gfx::IntSize>& aNativeSizes) const 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(layers::LayerManager* aManager,
+                            uint32_t aFlags) override;
+  NS_IMETHOD_(already_AddRefed<layers::ImageContainer>)
+  GetImageContainer(layers::LayerManager* aManager, uint32_t aFlags) override;
+  NS_IMETHOD_(bool)
+  IsImageContainerAvailableAtSize(layers::LayerManager* aManager,
+                                  const gfx::IntSize& aSize,
+                                  uint32_t aFlags) override;
+  NS_IMETHOD_(ImgDrawResult)
+  GetImageContainerAtSize(layers::LayerManager* aManager,
+                          const gfx::IntSize& aSize,
+                          const Maybe<SVGImageContext>& aSVGContext,
+                          uint32_t aFlags,
+                          layers::ImageContainer** aOutContainer) override;
+  NS_IMETHOD_(ImgDrawResult)
+  Draw(gfxContext* aContext, const nsIntSize& aSize, const ImageRegion& aRegion,
+       uint32_t aWhichFrame, gfx::SamplingFilter aSamplingFilter,
+       const Maybe<SVGImageContext>& aSVGContext, uint32_t aFlags,
+       float aOpacity) override;
+  NS_IMETHOD_(nsIntRect)
+  GetImageSpaceInvalidationRect(const nsIntRect& aRect) override;
+  nsIntSize OptimalImageSizeForDest(const gfxSize& aDest, uint32_t aWhichFrame,
+                                    gfx::SamplingFilter aSamplingFilter,
+                                    uint32_t aFlags) override;
+
+  /**
+   * Computes a matrix that applies the rotation and reflection specified by
+   * aOrientation, or that matrix's inverse if aInvert is true.
+   *
+   * @param aSize The scaled size of the inner image. (When outside code
+   * specifies the scaled size, as with imgIContainer::Draw and its aSize
+   * parameter, it's necessary to swap the width and height if
+   * mOrientation.SwapsWidthAndHeight() is true.)
+   *
+   * @param aInvert If true, compute the inverse of the orientation matrix.
+   * Prefer this approach to OrientationMatrix(..).Invert(), because it's more
+   * numerically accurate.
+   */
+  static gfxMatrix OrientationMatrix(Orientation aOrientation,
+                                     const nsIntSize& aSize,
+                                     bool aInvert = false);
+
+  /**
+   * Returns a SourceSurface that is the result of rotating and flipping
+   * aSurface according to aOrientation.
+   */
+  static already_AddRefed<SourceSurface> OrientSurface(Orientation aOrientation,
+                                                       SourceSurface* aSurface);
+
+ protected:
+  OrientedImage(Image* aImage, Orientation aOrientation)
+      : ImageWrapper(aImage), mOrientation(aOrientation) {}
+
+  virtual ~OrientedImage() {}
+
+  gfxMatrix OrientationMatrix(const nsIntSize& aSize, bool aInvert = false) {
+    return OrientationMatrix(mOrientation, aSize, aInvert);
+  }
+
+ private:
+  Orientation mOrientation;
+
+  friend class ImageOps;
+};
+
+}  // namespace image
+}  // namespace mozilla
+
+#endif  // mozilla_image_OrientedImage_h