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Diffstat (limited to 'image/imgIContainer.idl')
| -rw-r--r-- | image/imgIContainer.idl | 549 |
1 files changed, 549 insertions, 0 deletions
diff --git a/image/imgIContainer.idl b/image/imgIContainer.idl new file mode 100644 index 000000000..20c949037 --- /dev/null +++ b/image/imgIContainer.idl @@ -0,0 +1,549 @@ +/** -*- 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/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); +[ptr] native nsIFrame(nsIFrame); +native TempRefImageContainer(already_AddRefed<mozilla::layers::ImageContainer>); +[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<mozilla::SVGImageContext>); +native TempRefSourceSurface(already_AddRefed<mozilla::gfx::SourceSurface>); +native TempRefImgIContainer(already_AddRefed<imgIContainer>); +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 nsSize 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 <svg> 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 <svg> + * 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); +}; |