mirror of
https://github.com/classilla/tenfourfox.git
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522 lines
21 KiB
Plaintext
522 lines
21 KiB
Plaintext
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/** -*- 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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#include "nsISupports.idl"
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%{C++
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#include "DrawResult.h"
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#include "gfxContext.h"
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#include "gfxMatrix.h"
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#include "gfxRect.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/RefPtr.h"
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#include "nsRect.h"
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#include "nsSize.h"
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#include "limits.h"
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class nsIDocument;
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namespace mozilla {
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namespace layers {
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class LayerManager;
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class ImageContainer;
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}
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}
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class nsIFrame;
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namespace mozilla {
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class TimeStamp;
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class SVGImageContext;
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}
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namespace mozilla {
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namespace image {
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class ImageRegion;
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struct Orientation;
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}
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}
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%}
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native DrawResult(mozilla::image::DrawResult);
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[ptr] native gfxContext(gfxContext);
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[ref] native gfxMatrix(gfxMatrix);
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[ref] native gfxRect(gfxRect);
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[ref] native gfxSize(gfxSize);
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native Filter(mozilla::gfx::Filter);
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[ref] native nsIntRect(nsIntRect);
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native nsIntRectByVal(nsIntRect);
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[ref] native nsIntSize(nsIntSize);
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native nsSize(nsSize);
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[ptr] native nsIFrame(nsIFrame);
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native TempRefImageContainer(already_AddRefed<mozilla::layers::ImageContainer>);
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[ref] native ImageRegion(mozilla::image::ImageRegion);
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[ptr] native LayerManager(mozilla::layers::LayerManager);
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native Orientation(mozilla::image::Orientation);
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[ref] native TimeStamp(mozilla::TimeStamp);
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[ref] native MaybeSVGImageContext(mozilla::Maybe<mozilla::SVGImageContext>);
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native TempRefSourceSurface(already_AddRefed<mozilla::gfx::SourceSurface>);
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native TempRefImgIContainer(already_AddRefed<imgIContainer>);
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native nsIntSizeByVal(nsIntSize);
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[ptr] native nsIDocument(nsIDocument);
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/**
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* imgIContainer is the interface that represents an image. It allows
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* access to frames as Thebes surfaces. It also allows drawing of images
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* onto Thebes contexts.
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*
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* Internally, imgIContainer also manages animation of images.
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*/
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[scriptable, builtinclass, uuid(a8dbee24-ff86-4755-b40e-51175caf31af)]
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interface imgIContainer : nsISupports
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{
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/**
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* The width of the container rectangle. In the case of any error,
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* zero is returned, and an exception will be thrown.
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*/
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readonly attribute int32_t width;
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/**
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* The height of the container rectangle. In the case of any error,
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* zero is returned, and an exception will be thrown.
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*/
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readonly attribute int32_t height;
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/**
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* The intrinsic size of this image in appunits. If the image has no intrinsic
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* size in a dimension, -1 will be returned for that dimension. In the case of
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* any error, an exception will be thrown.
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*/
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[noscript] readonly attribute nsSize intrinsicSize;
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/**
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* The (dimensionless) intrinsic ratio of this image. In the case of any
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* error, an exception will be thrown.
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*/
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[noscript] readonly attribute nsSize intrinsicRatio;
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/**
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* Given a size at which this image will be displayed, and the drawing
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* parameters affecting how it will be drawn, returns the image size which
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* should be used to draw to produce the highest quality result. This is the
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* appropriate size, for example, to use as an input to the pixel snapping
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* algorithm.
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*
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* For best results the size returned by this method should not be cached. It
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* can change over time due to changes in the internal state of the image.
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*
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* @param aDest The size of the destination rect into which this image will be
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* drawn, in device pixels.
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* @param aWhichFrame Frame specifier of the FRAME_* variety.
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* @param aFilter The filter to be used if we're scaling the image.
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* @param aFlags Flags of the FLAG_* variety
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*/
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[notxpcom, nostdcall] nsIntSizeByVal
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optimalImageSizeForDest([const] in gfxSize aDest, in uint32_t aWhichFrame,
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in Filter aFilter, in uint32_t aFlags);
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/**
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* Enumerated values for the 'type' attribute (below).
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*/
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const unsigned short TYPE_RASTER = 0;
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const unsigned short TYPE_VECTOR = 1;
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/**
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* The type of this image (one of the TYPE_* values above).
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*/
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[infallible] readonly attribute unsigned short type;
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/**
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* Whether this image is animated. You can only be guaranteed that querying
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* this will not throw if STATUS_DECODE_COMPLETE is set on the imgIRequest.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if the animated state cannot be determined.
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*/
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readonly attribute boolean animated;
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/**
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* Flags for imgIContainer operations.
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*
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* Meanings:
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*
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* FLAG_NONE: Lack of flags.
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*
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* FLAG_SYNC_DECODE: Forces synchronous/non-progressive decode of all
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* available data before the call returns.
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*
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* FLAG_SYNC_DECODE_IF_FAST: Like FLAG_SYNC_DECODE, but requests a sync decode
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* be performed only if ImageLib estimates it can be completed very quickly.
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*
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* FLAG_ASYNC_NOTIFY: Send notifications asynchronously, even if we decode
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* synchronously beause of FLAG_SYNC_DECODE or FLAG_SYNC_DECODE_IF_FAST.
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*
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* FLAG_DECODE_NO_PREMULTIPLY_ALPHA: Do not premultiply alpha if
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* it's not already premultiplied in the image data.
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*
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* FLAG_DECODE_NO_COLORSPACE_CONVERSION: Do not do any colorspace conversion;
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* ignore any embedded profiles, and don't convert to any particular
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* destination space.
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*
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* FLAG_CLAMP: Extend the image to the fill area by clamping image sample
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* coordinates instead of by tiling. This only affects 'draw'.
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*
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* FLAG_HIGH_QUALITY_SCALING: A hint as to whether this image should be
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* scaled using the high quality scaler. Do not set this if not drawing to
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* a window or not listening to invalidations.
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*
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* FLAG_WANT_DATA_SURFACE: Can be passed to GetFrame when the caller wants a
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* DataSourceSurface instead of a hardware accelerated surface. This can be
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* important for performance (by avoiding an upload to/readback from the GPU)
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* when the caller knows they want a SourceSurface of type DATA.
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*
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* FLAG_BYPASS_SURFACE_CACHE: Forces drawing to happen rather than taking
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* cached rendering from the surface cache. This is used when we are printing,
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* for example, where we want the vector commands from VectorImages to end up
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* in the PDF output rather than a cached rendering at screen resolution.
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*/
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const unsigned long FLAG_NONE = 0x0;
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const unsigned long FLAG_SYNC_DECODE = 0x1;
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const unsigned long FLAG_SYNC_DECODE_IF_FAST = 0x2;
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const unsigned long FLAG_ASYNC_NOTIFY = 0x4;
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const unsigned long FLAG_DECODE_NO_PREMULTIPLY_ALPHA = 0x8;
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const unsigned long FLAG_DECODE_NO_COLORSPACE_CONVERSION = 0x10;
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const unsigned long FLAG_CLAMP = 0x20;
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const unsigned long FLAG_HIGH_QUALITY_SCALING = 0x40;
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const unsigned long FLAG_WANT_DATA_SURFACE = 0x80;
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const unsigned long FLAG_BYPASS_SURFACE_CACHE = 0x100;
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/**
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* A constant specifying the default set of decode flags (i.e., the default
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* values for FLAG_DECODE_*).
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*/
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const unsigned long DECODE_FLAGS_DEFAULT = 0;
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/**
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* Constants for specifying various "special" frames.
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*
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* FRAME_FIRST: The first frame
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* FRAME_CURRENT: The current frame
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*
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* FRAME_MAX_VALUE should be set to the value of the maximum constant above,
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* as it is used for ensuring that a valid value was passed in.
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*/
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const unsigned long FRAME_FIRST = 0;
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const unsigned long FRAME_CURRENT = 1;
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const unsigned long FRAME_MAX_VALUE = 1;
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/**
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* Get a surface for the given frame. This may be a platform-native,
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* optimized surface, so you cannot inspect its pixel data. If you
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* need that, use SourceSurface::GetDataSurface.
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*
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* @param aWhichFrame Frame specifier of the FRAME_* variety.
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* @param aFlags Flags of the FLAG_* variety
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*/
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[noscript, notxpcom] TempRefSourceSurface getFrame(in uint32_t aWhichFrame,
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in uint32_t aFlags);
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/**
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* Get a surface for the given frame at the specified size. Matching the
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* requested size is best effort; it's not guaranteed that the surface you get
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* will be a perfect match. (Some reasons you may get a surface of a different
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* size include: if you requested upscaling, if downscale-during-decode is
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* disabled, or if you didn't request the first frame.)
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*
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* @param aSize The desired size.
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* @param aWhichFrame Frame specifier of the FRAME_* variety.
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* @param aFlags Flags of the FLAG_* variety
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*/
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[noscript, notxpcom] TempRefSourceSurface getFrameAtSize([const] in nsIntSize aSize,
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in uint32_t aWhichFrame,
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in uint32_t aFlags);
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/**
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* Whether this image is opaque (i.e., needs a background painted behind it).
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*/
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[notxpcom] boolean isOpaque();
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/**
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* @return true if getImageContainer() is expected to return a valid
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* ImageContainer when passed the given @Manager and @Flags
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* parameters.
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*/
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[noscript, notxpcom] boolean isImageContainerAvailable(in LayerManager aManager,
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in uint32_t aFlags);
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/**
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* Attempts to create an ImageContainer (and Image) containing the current
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* frame.
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*
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* Avoid calling this unless you're actually going to layerize this image.
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*
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* @param aManager The LayerManager which will be used to create the
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* ImageContainer.
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* @param aFlags Decoding / drawing flags (in other words, FLAG_* flags).
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* Currently only FLAG_SYNC_DECODE and FLAG_SYNC_DECODE_IF_FAST
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* are supported.
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* @return An ImageContainer for the current frame, or nullptr if one could
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* not be created.
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*/
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[noscript, notxpcom] TempRefImageContainer getImageContainer(in LayerManager aManager,
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in uint32_t aFlags);
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/**
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* Draw the requested frame of this image onto the context specified.
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*
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* Drawing an image involves scaling it to a certain size (which may be
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* implemented as a "smart" scale by substituting an HQ-scaled frame or
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* rendering at a high DPI), and then selecting a region of that image to
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* draw. That region is drawn onto the graphics context and in the process
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* transformed by the context matrix, which determines the final area that is
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* filled. The basic process looks like this:
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*
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* +------------------+
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* | Image |
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* | |
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* | intrinsic width |
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* | X |
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* | intrinsic height |
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* +------------------+
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* / \
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* / \
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* / (scale to aSize) \
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* / \
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* +----------------------------+
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* | |
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* | Scaled Image |
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* | aSize.width X aSize.height |
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* | |
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* | +---------+ |
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* | | aRegion | |
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* | +---------+ |
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* +-------(---------(----------+
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* | |
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* / \
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* | (transform |
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* / by aContext \
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* | matrix) |
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* / \
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* +---------------------+
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* | |
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* | Fill Rect |
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* | |
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* +---------------------+
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*
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* The region may extend outside of the scaled image's boundaries. It's
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* actually a region in tiled image space, which is formed by tiling the
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* scaled image infinitely in every direction. Drawing with a region larger
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* than the scaled image thus causes the filled area to contain multiple tiled
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* copies of the image, which looks like this:
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*
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* ....................................................
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* : : : :
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* : Tile : Tile : Tile :
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* : +------------[aRegion]------------+ :
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* :........|.......:................:........|.......:
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* : | : : | :
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* : Ti|le : Scaled Image : Ti|le :
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* : | : : | :
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* :........|.......:................:........|.......:
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* : +---------------------------------+ :
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* : Ti|le : Tile : Ti|le :
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* : / : : \ :
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* :......(.........:................:..........).....:
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* | |
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* / \
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* | (transform by aContext matrix) |
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* / \
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* +---------------------------------------------+
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* | : : |
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* |.....:.................................:.....|
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* | : : |
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* | : Tiled Fill : |
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* | : : |
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* |.....:.................................:.....|
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* | : : |
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* +---------------------------------------------+
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*
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*
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* @param aContext The Thebes context to draw the image to.
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* @param aSize The size to which the image should be scaled before drawing.
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* This requirement may be satisfied using HQ scaled frames,
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* selecting from different resolution layers, drawing at a
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* higher DPI, or just performing additional scaling on the
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* graphics context. Callers can use optimalImageSizeForDest()
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* to determine the best choice for this parameter if they have
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* no special size requirements.
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* @param aRegion The region in tiled image space which will be drawn onto the
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* graphics context. aRegion is in the coordinate space of the
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* image after it has been scaled to aSize - that is, the image
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* is scaled first, and then aRegion is applied. When aFlags
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* includes FLAG_CLAMP, the image will be extended to this area
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* by clamping image sample coordinates. Otherwise, the image
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* will be automatically tiled as necessary. aRegion can also
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* optionally contain a second region which restricts the set
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* of pixels we're allowed to sample from when drawing; this
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* is only of use to callers which need to draw with pixel
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* snapping.
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* @param aWhichFrame Frame specifier of the FRAME_* variety.
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* @param aFilter The filter to be used if we're scaling the image.
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* @param aSVGContext If specified, SVG-related rendering context, such as
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* overridden attributes on the image document's root <svg>
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* node, and the size of the viewport that the full image
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* would occupy. Ignored for raster images.
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* @param aFlags Flags of the FLAG_* variety
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* @return A DrawResult value indicating whether and to what degree the
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* drawing operation was successful.
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*/
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[noscript, notxpcom] DrawResult
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draw(in gfxContext aContext,
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[const] in nsIntSize aSize,
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[const] in ImageRegion aRegion,
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in uint32_t aWhichFrame,
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in Filter aFilter,
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[const] in MaybeSVGImageContext aSVGContext,
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in uint32_t aFlags);
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/*
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* Ensures that an image is decoding. Calling this function guarantees that
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* the image will at some point fire off decode notifications. Images that
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* can be decoded "quickly" according to some heuristic will be decoded
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* synchronously.
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*/
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[noscript] void startDecoding();
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/*
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* This method triggers decoding for an image, but unlike startDecoding() it
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* enables the caller to provide more detailed information about the decode
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* request.
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*
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* @param aSize The size to which the image should be scaled while decoding,
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* if possible. If the image cannot be scaled to this size while
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* being decoded, it will be decoded at its intrinsic size.
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* @param aFlags Flags of the FLAG_* variety. Only the decode flags
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* (FLAG_DECODE_*) and FLAG_SYNC_DECODE (which will
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* synchronously decode images that can be decoded "quickly",
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* just like startDecoding() does) are accepted; others will be
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* ignored.
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*/
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[noscript] void requestDecodeForSize([const] in nsIntSize aSize,
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in uint32_t aFlags);
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/**
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* Increments the lock count on the image. An image will not be discarded
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* as long as the lock count is nonzero. Note that it is still possible for
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||
|
* the image to be undecoded if decode-on-draw is enabled and the image
|
||
|
* was never drawn.
|
||
|
*
|
||
|
* Upon instantiation images have a lock count of zero.
|
||
|
*/
|
||
|
void lockImage();
|
||
|
|
||
|
/**
|
||
|
* Decreases the lock count on the image. If the lock count drops to zero,
|
||
|
* the image is allowed to discard its frame data to save memory.
|
||
|
*
|
||
|
* Upon instantiation images have a lock count of zero. It is an error to
|
||
|
* call this method without first having made a matching lockImage() call.
|
||
|
* In other words, the lock count is not allowed to be negative.
|
||
|
*/
|
||
|
void unlockImage();
|
||
|
|
||
|
/**
|
||
|
* If this image is unlocked, discard its decoded data. If the image is
|
||
|
* locked or has already been discarded, do nothing.
|
||
|
*/
|
||
|
void requestDiscard();
|
||
|
|
||
|
/**
|
||
|
* Indicates that this imgIContainer has been triggered to update
|
||
|
* its internal animation state. Likely this should only be called
|
||
|
* from within nsImageFrame or objects of similar type.
|
||
|
*/
|
||
|
[notxpcom] void requestRefresh([const] in TimeStamp aTime);
|
||
|
|
||
|
/**
|
||
|
* Animation mode Constants
|
||
|
* 0 = normal
|
||
|
* 1 = don't animate
|
||
|
* 2 = loop once
|
||
|
*/
|
||
|
const short kNormalAnimMode = 0;
|
||
|
const short kDontAnimMode = 1;
|
||
|
const short kLoopOnceAnimMode = 2;
|
||
|
|
||
|
attribute unsigned short animationMode;
|
||
|
|
||
|
/* Methods to control animation */
|
||
|
void resetAnimation();
|
||
|
|
||
|
/*
|
||
|
* Returns an index for the requested animation frame (either FRAME_FIRST or
|
||
|
* FRAME_CURRENT).
|
||
|
*
|
||
|
* The units of the index aren't specified, and may vary between different
|
||
|
* types of images. What you can rely on is that on all occasions when
|
||
|
* getFrameIndex(FRAME_CURRENT) returns a certain value,
|
||
|
* draw(..FRAME_CURRENT..) will draw the same frame. The same holds for
|
||
|
* FRAME_FIRST as well.
|
||
|
*
|
||
|
* @param aWhichFrame Frame specifier of the FRAME_* variety.
|
||
|
*/
|
||
|
[notxpcom] float getFrameIndex(in uint32_t aWhichFrame);
|
||
|
|
||
|
/*
|
||
|
* Returns the inherent orientation of the image, as described in the image's
|
||
|
* metadata (e.g. EXIF).
|
||
|
*/
|
||
|
[notxpcom] Orientation getOrientation();
|
||
|
|
||
|
/*
|
||
|
* Returns the delay, in ms, between the first and second frame. If this
|
||
|
* returns 0, there is no delay between first and second frame (i.e., this
|
||
|
* image could render differently whenever it draws).
|
||
|
*
|
||
|
* If this image is not animated, or not known to be animated (see attribute
|
||
|
* animated), returns -1.
|
||
|
*/
|
||
|
[notxpcom] int32_t getFirstFrameDelay();
|
||
|
|
||
|
/*
|
||
|
* If this is an animated image that hasn't started animating already, this
|
||
|
* sets the animation's start time to the indicated time.
|
||
|
*
|
||
|
* This has no effect if the image isn't animated or it has started animating
|
||
|
* already; it also has no effect if the image format doesn't care about
|
||
|
* animation start time.
|
||
|
*
|
||
|
* In all cases, animation does not actually begin until startAnimation(),
|
||
|
* resetAnimation(), or requestRefresh() is called for the first time.
|
||
|
*/
|
||
|
[notxpcom] void setAnimationStartTime([const] in TimeStamp aTime);
|
||
|
|
||
|
/*
|
||
|
* Given an invalidation rect in the coordinate system used by the decoder,
|
||
|
* returns an invalidation rect in image space.
|
||
|
*
|
||
|
* This is the identity transformation in most cases, but the result can
|
||
|
* differ if the image is wrapped by an ImageWrapper that changes its size
|
||
|
* or orientation.
|
||
|
*/
|
||
|
[notxpcom] nsIntRectByVal
|
||
|
getImageSpaceInvalidationRect([const] in nsIntRect aRect);
|
||
|
|
||
|
/*
|
||
|
* Removes any ImageWrappers and returns the unwrapped base image.
|
||
|
*/
|
||
|
[notxpcom, nostdcall] TempRefImgIContainer unwrap();
|
||
|
|
||
|
/*
|
||
|
* Propagate the use counters (if any) from this container to the passed in
|
||
|
* document.
|
||
|
*/
|
||
|
[noscript, notxpcom] void propagateUseCounters(in nsIDocument aDocument);
|
||
|
};
|