зеркало из https://github.com/mozilla/gecko-dev.git
539 строки
22 KiB
Plaintext
539 строки
22 KiB
Plaintext
/** -*- 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 "gfxContext.h"
|
|
#include "gfxMatrix.h"
|
|
#include "gfxRect.h"
|
|
#include "GraphicsFilter.h"
|
|
#include "mozilla/gfx/2D.h"
|
|
#include "mozilla/Maybe.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 ImageRegion;
|
|
struct Orientation;
|
|
|
|
/**
|
|
* An enumeration representing the result of a drawing operation.
|
|
*
|
|
* Most users of DrawResult will only be interested in whether the value is
|
|
* SUCCESS or not. The other values are primarily useful for debugging and error
|
|
* handling.
|
|
*
|
|
* SUCCESS: We successfully drew a completely decoded frame of the requested
|
|
* size. Drawing again with FLAG_SYNC_DECODE would not change the result.
|
|
*
|
|
* INCOMPLETE: We successfully drew a frame that was partially decoded. (Note
|
|
* that successfully drawing a partially decoded frame may not actually draw any
|
|
* pixels!) Drawing again with FLAG_SYNC_DECODE would improve the result.
|
|
*
|
|
* WRONG_SIZE: We successfully drew a wrongly-sized frame that had to be scaled.
|
|
* This is only returned if drawing again with FLAG_SYNC_DECODE would improve
|
|
* the result; if the size requested was larger than the intrinsic size of the
|
|
* image, for example, we would generally have to scale whether FLAG_SYNC_DECODE
|
|
* was specified or not, and therefore we would not return WRONG_SIZE.
|
|
*
|
|
* NOT_READY: We failed to draw because no decoded version of the image was
|
|
* available. Drawing again with FLAG_SYNC_DECODE would improve the result.
|
|
* (Though FLAG_SYNC_DECODE will not necessarily work until after the image's
|
|
* load event!)
|
|
*
|
|
* TEMPORARY_ERROR: We failed to draw due to a temporary error. Drawing may
|
|
* succeed at a later time.
|
|
*
|
|
* BAD_IMAGE: We failed to draw because the image has an error. This is a
|
|
* permanent condition.
|
|
*
|
|
* BAD_ARGS: We failed to draw because bad arguments were passed to draw().
|
|
*/
|
|
enum class DrawResult : uint8_t
|
|
{
|
|
SUCCESS,
|
|
INCOMPLETE,
|
|
WRONG_SIZE,
|
|
NOT_READY,
|
|
TEMPORARY_ERROR,
|
|
BAD_IMAGE,
|
|
BAD_ARGS
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
%}
|
|
|
|
native DrawResult(mozilla::image::DrawResult);
|
|
[ptr] native gfxContext(gfxContext);
|
|
[ref] native gfxMatrix(gfxMatrix);
|
|
[ref] native gfxRect(gfxRect);
|
|
[ref] native gfxSize(gfxSize);
|
|
native gfxGraphicsFilter(GraphicsFilter);
|
|
[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(mozilla::TemporaryRef<mozilla::gfx::SourceSurface>);
|
|
native TempRefImgIContainer(already_AddRefed<imgIContainer>);
|
|
native nsIntSizeByVal(nsIntSize);
|
|
|
|
|
|
/**
|
|
* 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(e3261ae7-4749-4cf6-bf06-59946233366f)]
|
|
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 aFilter 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 gfxGraphicsFilter aFilter, 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.
|
|
*
|
|
* 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.
|
|
*/
|
|
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;
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* Whether this image is opaque (i.e., needs a background painted behind it).
|
|
*/
|
|
[notxpcom] boolean isOpaque();
|
|
|
|
/**
|
|
* Attempts to create an ImageContainer (and Image) containing the current
|
|
* frame. Only valid for RASTER type images.
|
|
*
|
|
* @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 aFilter 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 gfxGraphicsFilter aFilter,
|
|
[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. 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 synchronously decodes
|
|
* images that can be decoded "quickly" according to some heuristic.
|
|
*/
|
|
[noscript] void startDecoding();
|
|
|
|
/*
|
|
* This method is equivalent to requestDecode(), but 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();
|
|
};
|