ClippedImage.h - mozsearch

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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_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;

  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