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103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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_ImageOps_h
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#define mozilla_image_ImageOps_h
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#include "nsCOMPtr.h"
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#include "nsRect.h"
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class gfxDrawable;
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class imgIContainer;
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class nsIInputStream;
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namespace mozilla {
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namespace gfx {
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class SourceSurface;
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}
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namespace image {
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class Image;
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struct Orientation;
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class ImageOps
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{
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public:
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/**
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* Creates a version of an existing image which does not animate and is frozen
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* at the first frame.
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*
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* @param aImage The existing image.
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*/
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static already_AddRefed<Image> Freeze(Image* aImage);
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static already_AddRefed<imgIContainer> Freeze(imgIContainer* aImage);
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/**
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* Creates a clipped version of an existing image. Animation is unaffected.
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*
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* @param aImage The existing image.
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* @param aClip The rectangle to clip the image against.
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* @param aSVGViewportSize The specific viewort size of aImage. Unless aImage
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* is a vector image without intrinsic size, this
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* argument should be pass as Nothing().
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*/
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static already_AddRefed<Image> Clip(Image* aImage, nsIntRect aClip,
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const Maybe<nsSize>& aSVGViewportSize =
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Nothing());
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static already_AddRefed<imgIContainer> Clip(imgIContainer* aImage,
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nsIntRect aClip,
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const Maybe<nsSize>& aSVGViewportSize =
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Nothing());
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/**
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* Creates a version of an existing image which is rotated and/or flipped to
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* the specified orientation.
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*
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* @param aImage The existing image.
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* @param aOrientation The desired orientation.
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*/
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static already_AddRefed<Image> Orient(Image* aImage,
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Orientation aOrientation);
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static already_AddRefed<imgIContainer> Orient(imgIContainer* aImage,
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Orientation aOrientation);
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/**
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* Creates an image from a gfxDrawable.
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*
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* @param aDrawable The gfxDrawable.
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*/
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static already_AddRefed<imgIContainer>
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CreateFromDrawable(gfxDrawable* aDrawable);
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/**
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* Decodes an image from an nsIInputStream directly into a SourceSurface,
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* without ever creating an Image or imgIContainer (which are mostly
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* main-thread-only). That means that this function may be called
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* off-main-thread.
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*
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* @param aInputStream An input stream containing an encoded image.
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* @param aMimeType The MIME type of the image.
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* @param aFlags Flags of the imgIContainer::FLAG_DECODE_* variety.
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* @return A SourceSurface containing the first frame of the image at its
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* intrinsic size, or nullptr if the image cannot be decoded.
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*/
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static already_AddRefed<gfx::SourceSurface>
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DecodeToSurface(nsIInputStream* aInputStream,
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const nsACString& aMimeType,
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uint32_t aFlags);
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private:
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// This is a static utility class, so disallow instantiation.
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virtual ~ImageOps() = 0;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_ImageOps_h
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