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/* -*- 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 */
#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;
NS_IMETHOD GetWidth(int32_t* aWidth) override;
NS_IMETHOD GetHeight(int32_t* aHeight) override;
nsresult GetNativeSizes(nsTArray<gfx::IntSize>& aNativeSizes) override;
NS_IMETHOD GetIntrinsicSize(nsSize* aSize) override;
Maybe<AspectRatio> GetIntrinsicRatio() override;
GetFrame(uint32_t aWhichFrame, uint32_t aFlags) override;
GetFrameAtSize(const gfx::IntSize& aSize, uint32_t aWhichFrame,
uint32_t aFlags) override;
IsImageContainerAvailable(WindowRenderer* aRenderer,
uint32_t aFlags) override;
GetImageProvider(WindowRenderer* aRenderer, const gfx::IntSize& aSize,
const SVGImageContext& aSVGContext,
const Maybe<ImageIntRegion>& aRegion, uint32_t aFlags,
WebRenderImageProvider** aProvider) override;
Draw(gfxContext* aContext, const nsIntSize& aSize, const ImageRegion& aRegion,
uint32_t aWhichFrame, gfx::SamplingFilter aSamplingFilter,
const SVGImageContext& aSVGContext, uint32_t aFlags,
float aOpacity) override;
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);
OrientedImage(Image* aImage, Orientation aOrientation)
: ImageWrapper(aImage), mOrientation(aOrientation) {}
virtual ~OrientedImage() {}
gfxMatrix OrientationMatrix(const nsIntSize& aSize, bool aInvert = false) {
return OrientationMatrix(mOrientation, aSize, aInvert);
Orientation mOrientation;
friend class ImageOps;
} // namespace image
} // namespace mozilla
#endif // mozilla_image_OrientedImage_h