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103 lines
4.0 KiB
C++
103 lines
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_OrientedImage_h
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#define mozilla_image_OrientedImage_h
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#include "ImageWrapper.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.h"
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#include "Orientation.h"
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namespace mozilla {
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namespace image {
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/**
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* An Image wrapper that rotates and/or flips an image according to a specified
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* Orientation.
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*
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* XXX(seth): There a known (performance, not correctness) issue with
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* GetImageContainer. See the comments for that method for more information.
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*/
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class OrientedImage : public ImageWrapper {
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typedef gfx::SourceSurface SourceSurface;
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public:
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NS_INLINE_DECL_REFCOUNTING_INHERITED(OrientedImage, ImageWrapper)
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NS_IMETHOD GetWidth(int32_t* aWidth) override;
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NS_IMETHOD GetHeight(int32_t* aHeight) override;
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nsresult GetNativeSizes(nsTArray<gfx::IntSize>& aNativeSizes) const override;
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NS_IMETHOD GetIntrinsicSize(nsSize* aSize) override;
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Maybe<AspectRatio> GetIntrinsicRatio() override;
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NS_IMETHOD_(already_AddRefed<SourceSurface>)
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GetFrame(uint32_t aWhichFrame, uint32_t aFlags) override;
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NS_IMETHOD_(already_AddRefed<SourceSurface>)
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GetFrameAtSize(const gfx::IntSize& aSize, uint32_t aWhichFrame,
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uint32_t aFlags) override;
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NS_IMETHOD_(bool)
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IsImageContainerAvailable(WindowRenderer* aRenderer,
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uint32_t aFlags) override;
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NS_IMETHOD_(ImgDrawResult)
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GetImageContainerAtSize(WindowRenderer* aRenderer, const gfx::IntSize& aSize,
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const Maybe<SVGImageContext>& aSVGContext,
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const Maybe<ImageIntRegion>& aRegion, uint32_t aFlags,
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layers::ImageContainer** aOutContainer) override;
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NS_IMETHOD_(ImgDrawResult)
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Draw(gfxContext* aContext, const nsIntSize& aSize, const ImageRegion& aRegion,
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uint32_t aWhichFrame, gfx::SamplingFilter aSamplingFilter,
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const Maybe<SVGImageContext>& aSVGContext, uint32_t aFlags,
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float aOpacity) override;
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NS_IMETHOD_(nsIntRect)
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GetImageSpaceInvalidationRect(const nsIntRect& aRect) override;
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nsIntSize OptimalImageSizeForDest(const gfxSize& aDest, uint32_t aWhichFrame,
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gfx::SamplingFilter aSamplingFilter,
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uint32_t aFlags) override;
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/**
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* Computes a matrix that applies the rotation and reflection specified by
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* aOrientation, or that matrix's inverse if aInvert is true.
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*
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* @param aSize The scaled size of the inner image. (When outside code
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* specifies the scaled size, as with imgIContainer::Draw and its aSize
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* parameter, it's necessary to swap the width and height if
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* mOrientation.SwapsWidthAndHeight() is true.)
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*
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* @param aInvert If true, compute the inverse of the orientation matrix.
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* Prefer this approach to OrientationMatrix(..).Invert(), because it's more
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* numerically accurate.
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*/
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static gfxMatrix OrientationMatrix(Orientation aOrientation,
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const nsIntSize& aSize,
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bool aInvert = false);
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/**
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* Returns a SourceSurface that is the result of rotating and flipping
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* aSurface according to aOrientation.
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*/
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static already_AddRefed<SourceSurface> OrientSurface(Orientation aOrientation,
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SourceSurface* aSurface);
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protected:
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OrientedImage(Image* aImage, Orientation aOrientation)
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: ImageWrapper(aImage), mOrientation(aOrientation) {}
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virtual ~OrientedImage() {}
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gfxMatrix OrientationMatrix(const nsIntSize& aSize, bool aInvert = false) {
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return OrientationMatrix(mOrientation, aSize, aInvert);
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}
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private:
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Orientation mOrientation;
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friend class ImageOps;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_OrientedImage_h
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