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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_FrozenImage_h
#define mozilla_image_FrozenImage_h
#include "ImageWrapper.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
namespace mozilla {
namespace image {
/**
* An Image wrapper that disables animation, freezing the image at its first
* frame. It does this using two strategies. If this is the only instance of the
* image, animation will never start, because IncrementAnimationConsumers is
* ignored. If there is another instance that is animated, that's still OK,
* because any imgIContainer method that is affected by animation gets its
* aWhichFrame argument set to FRAME_FIRST when it passes through FrozenImage.
*
* XXX(seth): There a known (performance, not correctness) issue with
* GetImageContainer. See the comments for that method for more information.
*/
class FrozenImage : public ImageWrapper
{
typedef gfx::SourceSurface SourceSurface;
public:
NS_DECL_ISUPPORTS_INHERITED
virtual void IncrementAnimationConsumers() override;
virtual void DecrementAnimationConsumers() override;
NS_IMETHOD GetAnimated(bool* aAnimated) 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_(DrawResult) Draw(gfxContext* aContext,
const nsIntSize& aSize,
const ImageRegion& aRegion,
uint32_t aWhichFrame,
gfx::SamplingFilter aSamplingFilter,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags) override;
NS_IMETHOD_(void) RequestRefresh(const TimeStamp& aTime) override;
NS_IMETHOD GetAnimationMode(uint16_t* aAnimationMode) override;
NS_IMETHOD SetAnimationMode(uint16_t aAnimationMode) override;
NS_IMETHOD ResetAnimation() override;
NS_IMETHOD_(float) GetFrameIndex(uint32_t aWhichFrame) override;
protected:
explicit FrozenImage(Image* aImage) : ImageWrapper(aImage) { }
virtual ~FrozenImage() { }
private:
friend class ImageOps;
};
} // namespace image
} // namespace mozilla
#endif // mozilla_image_FrozenImage_h
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