/** -*- 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/. */ #include "nsISupports.idl" %{C++ #include "DrawResult.h" #include "gfxContext.h" #include "gfxMatrix.h" #include "gfxRect.h" #include "mozilla/gfx/2D.h" #include "mozilla/AspectRatio.h" #include "mozilla/Maybe.h" #include "mozilla/RefPtr.h" #include "nsRect.h" #include "nsSize.h" #include "limits.h" class nsIDocument; namespace mozilla { namespace layers { class LayerManager; class ImageContainer; } } class nsIFrame; namespace mozilla { class TimeStamp; class SVGImageContext; } namespace mozilla { namespace image { class ImageRegion; struct Orientation; } } %} native DrawResult(mozilla::image::DrawResult); [ptr] native gfxContext(gfxContext); [ref] native gfxMatrix(gfxMatrix); [ref] native gfxRect(gfxRect); [ref] native gfxSize(gfxSize); native SamplingFilter(mozilla::gfx::SamplingFilter); [ref] native nsIntRect(nsIntRect); native nsIntRectByVal(nsIntRect); [ref] native nsIntSize(nsIntSize); native nsSize(nsSize); native AspectRatio(mozilla::AspectRatio); [ptr] native nsIFrame(nsIFrame); native TempRefImageContainer(already_AddRefed); [ref] native ImageRegion(mozilla::image::ImageRegion); [ptr] native LayerManager(mozilla::layers::LayerManager); native Orientation(mozilla::image::Orientation); [ref] native TimeStamp(mozilla::TimeStamp); [ref] native MaybeSVGImageContext(mozilla::Maybe); native TempRefSourceSurface(already_AddRefed); native TempRefImgIContainer(already_AddRefed); native nsIntSizeByVal(nsIntSize); [ptr] native nsIDocument(nsIDocument); /** * imgIContainer is the interface that represents an image. It allows * access to frames as Thebes surfaces. It also allows drawing of images * onto Thebes contexts. * * Internally, imgIContainer also manages animation of images. */ [scriptable, builtinclass, uuid(a8dbee24-ff86-4755-b40e-51175caf31af)] interface imgIContainer : nsISupports { /** * The width of the container rectangle. In the case of any error, * zero is returned, and an exception will be thrown. */ readonly attribute int32_t width; /** * The height of the container rectangle. In the case of any error, * zero is returned, and an exception will be thrown. */ readonly attribute int32_t height; /** * The intrinsic size of this image in appunits. If the image has no intrinsic * size in a dimension, -1 will be returned for that dimension. In the case of * any error, an exception will be thrown. */ [noscript] readonly attribute nsSize intrinsicSize; /** * The (dimensionless) intrinsic ratio of this image. In the case of any * error, an exception will be thrown. */ [noscript] readonly attribute AspectRatio intrinsicRatio; /** * Given a size at which this image will be displayed, and the drawing * parameters affecting how it will be drawn, returns the image size which * should be used to draw to produce the highest quality result. This is the * appropriate size, for example, to use as an input to the pixel snapping * algorithm. * * For best results the size returned by this method should not be cached. It * can change over time due to changes in the internal state of the image. * * @param aDest The size of the destination rect into which this image will be * drawn, in device pixels. * @param aWhichFrame Frame specifier of the FRAME_* variety. * @param aSamplingFilter The filter to be used if we're scaling the image. * @param aFlags Flags of the FLAG_* variety */ [notxpcom, nostdcall] nsIntSizeByVal optimalImageSizeForDest([const] in gfxSize aDest, in uint32_t aWhichFrame, in SamplingFilter aSamplingFilter, in uint32_t aFlags); /** * Enumerated values for the 'type' attribute (below). */ const unsigned short TYPE_RASTER = 0; const unsigned short TYPE_VECTOR = 1; /** * The type of this image (one of the TYPE_* values above). */ [infallible] readonly attribute unsigned short type; /** * Whether this image is animated. You can only be guaranteed that querying * this will not throw if STATUS_DECODE_COMPLETE is set on the imgIRequest. * * @throws NS_ERROR_NOT_AVAILABLE if the animated state cannot be determined. */ readonly attribute boolean animated; /** * Flags for imgIContainer operations. * * Meanings: * * FLAG_NONE: Lack of flags. * * FLAG_SYNC_DECODE: Forces synchronous/non-progressive decode of all * available data before the call returns. * * FLAG_SYNC_DECODE_IF_FAST: Like FLAG_SYNC_DECODE, but requests a sync decode * be performed only if ImageLib estimates it can be completed very quickly. * * FLAG_ASYNC_NOTIFY: Send notifications asynchronously, even if we decode * synchronously beause of FLAG_SYNC_DECODE or FLAG_SYNC_DECODE_IF_FAST. * * FLAG_DECODE_NO_PREMULTIPLY_ALPHA: Do not premultiply alpha if * it's not already premultiplied in the image data. * * FLAG_DECODE_NO_COLORSPACE_CONVERSION: Do not do any colorspace conversion; * ignore any embedded profiles, and don't convert to any particular * destination space. * * FLAG_CLAMP: Extend the image to the fill area by clamping image sample * coordinates instead of by tiling. This only affects 'draw'. * * FLAG_HIGH_QUALITY_SCALING: A hint as to whether this image should be * scaled using the high quality scaler. Do not set this if not drawing to * a window or not listening to invalidations. Passing this flag will do two * things: 1) request a decode of the image at the size asked for by the * caller if one isn't already started or complete, and 2) allows a decoded * frame of any size (it could be neither the requested size, nor the * intrinsic size) to be substituted. * * FLAG_WANT_DATA_SURFACE: Can be passed to GetFrame when the caller wants a * DataSourceSurface instead of a hardware accelerated surface. This can be * important for performance (by avoiding an upload to/readback from the GPU) * when the caller knows they want a SourceSurface of type DATA. * * FLAG_BYPASS_SURFACE_CACHE: Forces drawing to happen rather than taking * cached rendering from the surface cache. This is used when we are printing, * for example, where we want the vector commands from VectorImages to end up * in the PDF output rather than a cached rendering at screen resolution. * * FLAG_FORCE_PRESERVEASPECTRATIO_NONE: Force scaling this image * non-uniformly if necessary. This flag is for vector image only. A raster * image should ignore this flag. While drawing a vector image with this * flag, do not force uniform scaling even if its root node has a * preserveAspectRatio attribute that would otherwise require uniform * scaling , such as xMinYMin/ xMidYMin. Always scale the graphic content of * the given image non-uniformly if necessary such that the image's * viewBox (if specified or implied by height/width attributes) exactly * matches the viewport rectangle. * * FLAG_FORCE_UNIFORM_SCALING: Signal to ClippedImage::OptimalSizeForDest that * its returned size can only scale the image's size *uniformly* (by the same * factor in each dimension). We need this flag when painting border-image * section with SVG image source-data, if the SVG image has no viewBox and no * intrinsic size. In such a case, we synthesize a viewport for the SVG image * (a "window into SVG space") based on the border image area, and we need to * be sure we don't subsequently scale that viewport in a way that distorts * its contents by stretching them more in one dimension than the other. */ const unsigned long FLAG_NONE = 0x0; const unsigned long FLAG_SYNC_DECODE = 0x1; const unsigned long FLAG_SYNC_DECODE_IF_FAST = 0x2; const unsigned long FLAG_ASYNC_NOTIFY = 0x4; const unsigned long FLAG_DECODE_NO_PREMULTIPLY_ALPHA = 0x8; const unsigned long FLAG_DECODE_NO_COLORSPACE_CONVERSION = 0x10; const unsigned long FLAG_CLAMP = 0x20; const unsigned long FLAG_HIGH_QUALITY_SCALING = 0x40; const unsigned long FLAG_WANT_DATA_SURFACE = 0x80; const unsigned long FLAG_BYPASS_SURFACE_CACHE = 0x100; const unsigned long FLAG_FORCE_PRESERVEASPECTRATIO_NONE = 0x200; const unsigned long FLAG_FORCE_UNIFORM_SCALING = 0x400; /** * A constant specifying the default set of decode flags (i.e., the default * values for FLAG_DECODE_*). */ const unsigned long DECODE_FLAGS_DEFAULT = 0; /** * Constants for specifying various "special" frames. * * FRAME_FIRST: The first frame * FRAME_CURRENT: The current frame * * FRAME_MAX_VALUE should be set to the value of the maximum constant above, * as it is used for ensuring that a valid value was passed in. */ const unsigned long FRAME_FIRST = 0; const unsigned long FRAME_CURRENT = 1; const unsigned long FRAME_MAX_VALUE = 1; /** * Get a surface for the given frame. This may be a platform-native, * optimized surface, so you cannot inspect its pixel data. If you * need that, use SourceSurface::GetDataSurface. * * @param aWhichFrame Frame specifier of the FRAME_* variety. * @param aFlags Flags of the FLAG_* variety */ [noscript, notxpcom] TempRefSourceSurface getFrame(in uint32_t aWhichFrame, in uint32_t aFlags); /** * Get a surface for the given frame at the specified size. Matching the * requested size is best effort; it's not guaranteed that the surface you get * will be a perfect match. (Some reasons you may get a surface of a different * size include: if you requested upscaling, if downscale-during-decode is * disabled, or if you didn't request the first frame.) * * @param aSize The desired size. * @param aWhichFrame Frame specifier of the FRAME_* variety. * @param aFlags Flags of the FLAG_* variety */ [noscript, notxpcom] TempRefSourceSurface getFrameAtSize([const] in nsIntSize aSize, in uint32_t aWhichFrame, in uint32_t aFlags); /** * Returns true if this image will draw opaquely right now if asked to draw * with FLAG_HIGH_QUALITY_SCALING and otherwise default flags. If this image * (when decoded) is opaque but no decoded frames are available then * willDrawOpaqueNow will return false. */ [noscript, notxpcom] boolean willDrawOpaqueNow(); /** * @return true if getImageContainer() is expected to return a valid * ImageContainer when passed the given @Manager and @Flags * parameters. */ [noscript, notxpcom] boolean isImageContainerAvailable(in LayerManager aManager, in uint32_t aFlags); /** * Attempts to create an ImageContainer (and Image) containing the current * frame. * * Avoid calling this unless you're actually going to layerize this image. * * @param aManager The LayerManager which will be used to create the * ImageContainer. * @param aFlags Decoding / drawing flags (in other words, FLAG_* flags). * Currently only FLAG_SYNC_DECODE and FLAG_SYNC_DECODE_IF_FAST * are supported. * @return An ImageContainer for the current frame, or nullptr if one could * not be created. */ [noscript, notxpcom] TempRefImageContainer getImageContainer(in LayerManager aManager, in uint32_t aFlags); /** * Draw the requested frame of this image onto the context specified. * * Drawing an image involves scaling it to a certain size (which may be * implemented as a "smart" scale by substituting an HQ-scaled frame or * rendering at a high DPI), and then selecting a region of that image to * draw. That region is drawn onto the graphics context and in the process * transformed by the context matrix, which determines the final area that is * filled. The basic process looks like this: * * +------------------+ * | Image | * | | * | intrinsic width | * | X | * | intrinsic height | * +------------------+ * / \ * / \ * / (scale to aSize) \ * / \ * +----------------------------+ * | | * | Scaled Image | * | aSize.width X aSize.height | * | | * | +---------+ | * | | aRegion | | * | +---------+ | * +-------(---------(----------+ * | | * / \ * | (transform | * / by aContext \ * | matrix) | * / \ * +---------------------+ * | | * | Fill Rect | * | | * +---------------------+ * * The region may extend outside of the scaled image's boundaries. It's * actually a region in tiled image space, which is formed by tiling the * scaled image infinitely in every direction. Drawing with a region larger * than the scaled image thus causes the filled area to contain multiple tiled * copies of the image, which looks like this: * * .................................................... * : : : : * : Tile : Tile : Tile : * : +------------[aRegion]------------+ : * :........|.......:................:........|.......: * : | : : | : * : Ti|le : Scaled Image : Ti|le : * : | : : | : * :........|.......:................:........|.......: * : +---------------------------------+ : * : Ti|le : Tile : Ti|le : * : / : : \ : * :......(.........:................:..........).....: * | | * / \ * | (transform by aContext matrix) | * / \ * +---------------------------------------------+ * | : : | * |.....:.................................:.....| * | : : | * | : Tiled Fill : | * | : : | * |.....:.................................:.....| * | : : | * +---------------------------------------------+ * * * @param aContext The Thebes context to draw the image to. * @param aSize The size to which the image should be scaled before drawing. * This requirement may be satisfied using HQ scaled frames, * selecting from different resolution layers, drawing at a * higher DPI, or just performing additional scaling on the * graphics context. Callers can use optimalImageSizeForDest() * to determine the best choice for this parameter if they have * no special size requirements. * @param aRegion The region in tiled image space which will be drawn onto the * graphics context. aRegion is in the coordinate space of the * image after it has been scaled to aSize - that is, the image * is scaled first, and then aRegion is applied. When aFlags * includes FLAG_CLAMP, the image will be extended to this area * by clamping image sample coordinates. Otherwise, the image * will be automatically tiled as necessary. aRegion can also * optionally contain a second region which restricts the set * of pixels we're allowed to sample from when drawing; this * is only of use to callers which need to draw with pixel * snapping. * @param aWhichFrame Frame specifier of the FRAME_* variety. * @param aSamplingFilter The filter to be used if we're scaling the image. * @param aSVGContext If specified, SVG-related rendering context, such as * overridden attributes on the image document's root * node, and the size of the viewport that the full image * would occupy. Ignored for raster images. * @param aFlags Flags of the FLAG_* variety * @return A DrawResult value indicating whether and to what degree the * drawing operation was successful. */ [noscript, notxpcom] DrawResult draw(in gfxContext aContext, [const] in nsIntSize aSize, [const] in ImageRegion aRegion, in uint32_t aWhichFrame, in SamplingFilter aSamplingFilter, [const] in MaybeSVGImageContext aSVGContext, in uint32_t aFlags); /* * Ensures that an image is decoding. Calling this function guarantees that * the image will at some point fire off decode notifications. Images that * can be decoded "quickly" according to some heuristic will be decoded * synchronously. */ [noscript] void startDecoding(); /* * This method triggers decoding for an image, but unlike startDecoding() it * enables the caller to provide more detailed information about the decode * request. * * @param aSize The size to which the image should be scaled while decoding, * if possible. If the image cannot be scaled to this size while * being decoded, it will be decoded at its intrinsic size. * @param aFlags Flags of the FLAG_* variety. Only the decode flags * (FLAG_DECODE_*) and FLAG_SYNC_DECODE (which will * synchronously decode images that can be decoded "quickly", * just like startDecoding() does) are accepted; others will be * ignored. */ [noscript] void requestDecodeForSize([const] in nsIntSize aSize, in uint32_t aFlags); /** * Increments the lock count on the image. An image will not be discarded * as long as the lock count is nonzero. Note that it is still possible for * 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); };