gecko/image/src/ClippedImage.h

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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 http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_IMAGELIB_CLIPPEDIMAGE_H_
#define MOZILLA_IMAGELIB_CLIPPEDIMAGE_H_
#include "ImageWrapper.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/Maybe.h"
#include "mozilla/RefPtr.h"
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 mozilla::gfx::SourceSurface SourceSurface;
public:
NS_DECL_ISUPPORTS
virtual ~ClippedImage();
virtual nsIntRect FrameRect(uint32_t aWhichFrame) MOZ_OVERRIDE;
NS_IMETHOD GetWidth(int32_t* aWidth) MOZ_OVERRIDE;
NS_IMETHOD GetHeight(int32_t* aHeight) MOZ_OVERRIDE;
NS_IMETHOD GetIntrinsicSize(nsSize* aSize) MOZ_OVERRIDE;
NS_IMETHOD GetIntrinsicRatio(nsSize* aRatio) MOZ_OVERRIDE;
NS_IMETHOD_(mozilla::TemporaryRef<SourceSurface>)
GetFrame(uint32_t aWhichFrame, uint32_t aFlags) MOZ_OVERRIDE;
NS_IMETHOD GetImageContainer(mozilla::layers::LayerManager* aManager,
mozilla::layers::ImageContainer** _retval) MOZ_OVERRIDE;
NS_IMETHOD Draw(gfxContext* aContext,
GraphicsFilter aFilter,
const gfxMatrix& aUserSpaceToImageSpace,
const gfxRect& aFill,
const nsIntRect& aSubimage,
const nsIntSize& aViewportSize,
const SVGImageContext* aSVGContext,
uint32_t aWhichFrame,
uint32_t aFlags) MOZ_OVERRIDE;
NS_IMETHOD RequestDiscard() MOZ_OVERRIDE;
NS_IMETHOD_(Orientation) GetOrientation() MOZ_OVERRIDE;
protected:
ClippedImage(Image* aImage, nsIntRect aClip);
private:
mozilla::TemporaryRef<SourceSurface>
GetFrameInternal(const nsIntSize& aViewportSize,
const SVGImageContext* aSVGContext,
uint32_t aWhichFrame,
uint32_t aFlags);
bool ShouldClip();
bool MustCreateSurface(gfxContext* aContext,
const gfxMatrix& aTransform,
const gfxRect& aSourceRect,
const nsIntRect& aSubimage,
const uint32_t aFlags) const;
gfxFloat ClampFactor(const gfxFloat aToClamp, const int aReference) const;
nsresult DrawSingleTile(gfxContext* aContext,
GraphicsFilter aFilter,
const gfxMatrix& aUserSpaceToImageSpace,
const gfxRect& aFill,
const nsIntRect& aSubimage,
const nsIntSize& aViewportSize,
const SVGImageContext* aSVGContext,
uint32_t aWhichFrame,
uint32_t aFlags);
// If we are forced to draw a temporary surface, we cache it here.
nsAutoPtr<ClippedImageCachedSurface> mCachedSurface;
nsIntRect mClip; // The region to clip to.
Maybe<bool> mShouldClip; // Memoized ShouldClip() if present.
friend class DrawSingleTileCallback;
friend class ImageOps;
};
} // namespace image
} // namespace mozilla
#endif // MOZILLA_IMAGELIB_CLIPPEDIMAGE_H_