image/ClippedImage.h
author Mike Hommey <mh+mozilla@glandium.org>
Thu, 05 Jul 2018 14:58:09 +0900
changeset 425426 531b966781e6b2c086a798b18cec231a26a9d3e5
parent 403504 91d647c847e56cb0db2be19647507cec207b1d08
child 431401 69a4c2a0aac6e8bfc041a82b634611e1432af36b
permissions -rw-r--r--
Bug 1469091 - Build the clang plugin as a host shared library. r=ted This adds just enough host shared library support for this one use case, but also takes shortcuts, because fully supporting host shared library is a deep rabbit hole I'm not ready to take just to fix --enable-lto --enable-clang-plugin on mac builds. One downside is that one my machine the plugin now takes > 80s to build, instead of 15s before, thanks to the lack of unified sources.

/* -*- 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"

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;
  NS_IMETHOD GetIntrinsicRatio(nsSize* aRatio) 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_(already_AddRefed<layers::ImageContainer>)
    GetImageContainerAtSize(layers::LayerManager* aManager,
                            const gfx::IntSize& aSize,
                            const Maybe<SVGImageContext>& aSVGContext,
                            uint32_t aFlags) 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 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:
  Pair<ImgDrawResult, RefPtr<SourceSurface>>
    GetFrameInternal(const nsIntSize& aSize,
                     const Maybe<SVGImageContext>& aSVGContext,
                     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 Maybe<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