The Tor Browser: image/public/imgIContainer.idl@ca08bd8f51b2 (annotated)

image/public/imgIContainer.idl@ca08bd8f51b2 (annotated)

image/public/imgIContainer.idl

Wed, 31 Dec 2014 06:55:46 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:46 +0100
changeset 1: ca08bd8f51b2
permissions: -rw-r--r--

Added tag TORBROWSER_REPLICA for changeset 6474c204b198

 /** -*- 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 "gfxImageSurface.h"
 #include "gfxContext.h"
 #include "gfxMatrix.h"
 #include "gfxRect.h"
 #include "GraphicsFilter.h"
 #include "gfxASurface.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/RefPtr.h"
 #include "nsRect.h"
 #include "nsSize.h"
 #include "limits.h"
 namespace mozilla {
 namespace layers {
 class LayerManager;
 class ImageContainer;
 }
 }
 class nsIFrame;
 namespace mozilla {
 class TimeStamp;
 class SVGImageContext;
 }
 namespace mozilla {
 namespace image {
 class Orientation;
 }
 }
 %}
 [ptr] native gfxImageSurface(gfxImageSurface);
 [ptr] native gfxASurface(gfxASurface);
 native gfxImageFormat(gfxASurface::gfxImageFormat);
 [ptr] native gfxContext(gfxContext);
 [ref] native gfxMatrix(gfxMatrix);
 [ref] native gfxRect(gfxRect);
 native gfxGraphicsFilter(GraphicsFilter);
 [ref] native nsIntRect(nsIntRect);
 [ref] native nsIntSize(nsIntSize);
 native nsSize(nsSize);
 [ptr] native nsIFrame(nsIFrame);
 [ptr] native ImageContainer(mozilla::layers::ImageContainer);
 [ptr] native LayerManager(mozilla::layers::LayerManager);
 native Orientation(mozilla::image::Orientation);
 [ref] native TimeStamp(mozilla::TimeStamp);
 [ptr] native SVGImageContext(mozilla::SVGImageContext);
 native TempRefSourceSurface(mozilla::TemporaryRef<mozilla::gfx::SourceSurface>);
 /**
  * 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(503a830c-734d-4362-91f6-73f83ac59646)]
 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;
   /**
     * 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).
    */
   readonly attribute unsigned short type;
   /**
    * Direct C++ accessor for 'type' attribute, for convenience.
    */
   [noscript, notxpcom] uint16_t GetType();
   /**
    * 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. It is an error to pass this flag
    * from a call stack that originates in a decoder (ie, from a decoder
    * observer event).
    *
    * 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.
    */
   const long FLAG_NONE            = 0x0;
   const long FLAG_SYNC_DECODE     = 0x1;
   const long FLAG_DECODE_NO_PREMULTIPLY_ALPHA = 0x2;
   const long FLAG_DECODE_NO_COLORSPACE_CONVERSION = 0x4;
   const long FLAG_CLAMP           = 0x8;
   const long FLAG_HIGH_QUALITY_SCALING = 0x10;
   const long FLAG_WANT_DATA_SURFACE = 0x20;
   /**
     * 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 gfxASurface::GetAsReadableARGB32ImageSurface or
    * gfxASurface::CopyToARGB32ImageSurface.
    *
    * @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);
   /**
    * Whether the given frame is opaque; that is, needs the background painted
    * behind it.
    *
    * @param aWhichFrame Frame specifier of the FRAME_* variety.
    */
   [notxpcom] boolean frameIsOpaque(in uint32_t aWhichFrame);
   /**
    * Attempts to create an ImageContainer (and Image) containing the current
    * frame. Only valid for RASTER type images.
    */
   [noscript] ImageContainer getImageContainer(in LayerManager aManager);
   /**
    * Draw a frame onto the context specified.
    *
    * @param aContext The Thebes context to draw the image to.
    * @param aFilter The filter to be used if we're scaling the image.
    * @param aUserSpaceToImageSpace The transformation from user space (e.g.,
    *                               appunits) to image space.
    * @param aFill The area in the context to draw pixels to. When aFlags includes
    *              FLAG_CLAMP, the image will be extended to this area by clampling
    *              image sample coordinates. Otherwise, the image will be
    *              automatically tiled as necessary.
    * @param aSubimage The area of the image, in pixels, that we are allowed to
    *                  sample from.
    * @param aViewportSize
    *          The size (in CSS pixels) of the viewport that would be available
    *          for the full image to occupy, if we were drawing the full image.
    *          (Note that we might not actually be drawing the full image -- we
    *          might be restricted by aSubimage -- but we still need the full
    *          image's viewport-size in order for SVG images with the "viewBox"
    *          attribute to position their content correctly.)
    * @param aSVGContext If non-null, SVG-related rendering context such as
    *                    overridden attributes on the image document's root <svg>
    *                    node. Ignored for raster images.
    * @param aWhichFrame Frame specifier of the FRAME_* variety.
    * @param aFlags Flags of the FLAG_* variety
    */
   [noscript] void draw(in gfxContext aContext,
                        in gfxGraphicsFilter aFilter,
                        [const] in gfxMatrix aUserSpaceToImageSpace,
                        [const] in gfxRect aFill,
                        [const] in nsIntRect aSubimage,
                        [const] in nsIntSize aViewportSize,
                        [const] in SVGImageContext aSVGContext,
                        in uint32_t aWhichFrame,
                        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. Calling draw()
    * or getFrame() triggers the same mechanism internally. Thus, if you want to
    * be sure that the image will be decoded but don't want to access it until
    * then, you must call requestDecode().
    */
   void requestDecode();
   /*
    * This is equivalent to requestDecode() but it also decodes some of the image.
    */
   [noscript] void startDecoding();
   /*
    * Returns true if no more decoding can be performed on this image. Images
    * with errors return true since they cannot be decoded any further. Note that
    * because decoded images may be discarded, isDecoded() may return false even
    * if it has returned true in the past.
    */
   [noscript, notxpcom, nostdcall] bool isDecoded();
   /**
     * 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);
 };

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image/public/imgIContainer.idl@ca08bd8f51b2 (annotated)

image/public/imgIContainer.idl