зеркало из https://github.com/mozilla/pjs.git
682 строки
21 KiB
C++
682 строки
21 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <robert@ocallahan.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef GFX_IMAGELAYER_H
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#define GFX_IMAGELAYER_H
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#include "Layers.h"
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#include "nsISupportsImpl.h"
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#include "gfxPattern.h"
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#include "nsThreadUtils.h"
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#include "mozilla/ReentrantMonitor.h"
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#include "mozilla/TimeStamp.h"
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#include "mozilla/mozalloc.h"
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#include "mozilla/Mutex.h"
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#include "gfxPlatform.h"
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#ifdef XP_MACOSX
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#include "nsIOSurface.h"
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#endif
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namespace mozilla {
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namespace layers {
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enum StereoMode {
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STEREO_MODE_MONO,
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STEREO_MODE_LEFT_RIGHT,
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STEREO_MODE_RIGHT_LEFT,
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STEREO_MODE_BOTTOM_TOP,
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STEREO_MODE_TOP_BOTTOM
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};
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struct ImageBackendData
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{
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virtual ~ImageBackendData() {}
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protected:
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ImageBackendData() {}
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};
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/**
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* A class representing a buffer of pixel data. The data can be in one
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* of various formats including YCbCr.
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*
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* Create an image using an ImageContainer. Fill the image with data, and
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* then call ImageContainer::SetImage to display it. An image must not be
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* modified after calling SetImage. Image implementations do not need to
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* perform locking; when filling an Image, the Image client is responsible
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* for ensuring only one thread accesses the Image at a time, and after
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* SetImage the image is immutable.
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*
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* When resampling an Image, only pixels within the buffer should be
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* sampled. For example, cairo images should be sampled in EXTEND_PAD mode.
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*/
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class THEBES_API Image {
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(Image)
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public:
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virtual ~Image() {}
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enum Format {
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/**
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* The PLANAR_YCBCR format creates a PlanarYCbCrImage. All backends should
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* support this format, because the Ogg video decoder depends on it.
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* The maximum image width and height is 16384.
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*/
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PLANAR_YCBCR,
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/**
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* The CAIRO_SURFACE format creates a CairoImage. All backends should
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* support this format, because video rendering sometimes requires it.
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*
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* This format is useful even though a ThebesLayer could be used.
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* It makes it easy to render a cairo surface when another Image format
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* could be used. It can also avoid copying the surface data in some
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* cases.
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*
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* Images in CAIRO_SURFACE format should only be created and
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* manipulated on the main thread, since the underlying cairo surface
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* is main-thread-only.
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*/
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CAIRO_SURFACE,
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/**
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* The MAC_IO_SURFACE format creates a MacIOSurfaceImage.
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*
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* It wraps an IOSurface object and binds it directly to a GL texture.
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*/
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MAC_IO_SURFACE
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};
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Format GetFormat() { return mFormat; }
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void* GetImplData() { return mImplData; }
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virtual already_AddRefed<gfxASurface> GetAsSurface() = 0;
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virtual gfxIntSize GetSize() = 0;
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ImageBackendData* GetBackendData(LayerManager::LayersBackend aBackend)
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{ return mBackendData[aBackend]; }
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void SetBackendData(LayerManager::LayersBackend aBackend, ImageBackendData* aData)
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{ mBackendData[aBackend] = aData; }
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protected:
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Image(void* aImplData, Format aFormat) :
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mImplData(aImplData),
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mFormat(aFormat)
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{}
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nsAutoPtr<ImageBackendData> mBackendData[LayerManager::LAYERS_LAST];
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void* mImplData;
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Format mFormat;
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};
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/**
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* A RecycleBin is owned by an ImageContainer. We store buffers in it that we
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* want to recycle from one image to the next.It's a separate object from
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* ImageContainer because images need to store a strong ref to their RecycleBin
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* and we must avoid creating a reference loop between an ImageContainer and
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* its active image.
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*/
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class BufferRecycleBin {
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(RecycleBin)
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typedef mozilla::gl::GLContext GLContext;
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public:
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BufferRecycleBin();
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void RecycleBuffer(PRUint8* aBuffer, PRUint32 aSize);
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// Returns a recycled buffer of the right size, or allocates a new buffer.
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PRUint8* GetBuffer(PRUint32 aSize);
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private:
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typedef mozilla::Mutex Mutex;
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// This protects mRecycledBuffers, mRecycledBufferSize, mRecycledTextures
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// and mRecycledTextureSizes
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Mutex mLock;
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// We should probably do something to prune this list on a timer so we don't
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// eat excess memory while video is paused...
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nsTArray<nsAutoArrayPtr<PRUint8> > mRecycledBuffers;
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// This is only valid if mRecycledBuffers is non-empty
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PRUint32 mRecycledBufferSize;
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};
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/**
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* Returns true if aFormat is in the given format array.
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*/
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static inline bool
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FormatInList(const Image::Format* aFormats, PRUint32 aNumFormats,
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Image::Format aFormat)
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{
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for (PRUint32 i = 0; i < aNumFormats; ++i) {
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if (aFormats[i] == aFormat) {
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return true;
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}
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}
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return false;
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}
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/**
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* A class that manages Image creation for a LayerManager. The only reason
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* we need a separate class here is that LayerMananers aren't threadsafe
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* (because layers can only be used on the main thread) and we want to
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* be able to create images from any thread, to facilitate video playback
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* without involving the main thread, for example.
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* Different layer managers can implement child classes of this making it
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* possible to create layer manager specific images.
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* This class is not meant to be used directly but rather can be set on an
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* image container. This is usually done by the layer system internally and
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* not explicitly by users. For PlanarYCbCr or Cairo images the default
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* implementation will creates images whose data lives in system memory, for
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* MacIOSurfaces the default implementation will be a simple nsIOSurface
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* wrapper.
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*/
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class THEBES_API ImageFactory
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{
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ImageFactory)
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protected:
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friend class ImageContainer;
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ImageFactory() {}
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virtual ~ImageFactory() {}
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virtual already_AddRefed<Image> CreateImage(const Image::Format* aFormats,
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PRUint32 aNumFormats,
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const gfxIntSize &aScaleHint,
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BufferRecycleBin *aRecycleBin);
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};
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/**
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* A class that manages Images for an ImageLayer. The only reason
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* we need a separate class here is that ImageLayers aren't threadsafe
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* (because layers can only be used on the main thread) and we want to
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* be able to set the current Image from any thread, to facilitate
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* video playback without involving the main thread, for example.
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*/
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class THEBES_API ImageContainer {
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ImageContainer)
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public:
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ImageContainer() :
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mReentrantMonitor("ImageContainer.mReentrantMonitor"),
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mPaintCount(0),
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mPreviousImagePainted(false),
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mImageFactory(new ImageFactory()),
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mRecycleBin(new BufferRecycleBin())
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{}
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~ImageContainer();
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/**
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* Create an Image in one of the given formats.
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* Picks the "best" format from the list and creates an Image of that
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* format.
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* Returns null if this backend does not support any of the formats.
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* Can be called on any thread. This method takes mReentrantMonitor
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* when accessing thread-shared state.
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*/
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already_AddRefed<Image> CreateImage(const Image::Format* aFormats,
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PRUint32 aNumFormats);
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/**
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* Set an Image as the current image to display. The Image must have
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* been created by this ImageContainer.
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* Can be called on any thread. This method takes mReentrantMonitor
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* when accessing thread-shared state.
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*
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* The Image data must not be modified after this method is called!
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*/
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void SetCurrentImage(Image* aImage);
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/**
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* Get the current Image.
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* This has to add a reference since otherwise there are race conditions
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* where the current image is destroyed before the caller can add
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* a reference.
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* Can be called on any thread. This method takes mReentrantMonitor
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* when accessing thread-shared state.
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* Implementations must call CurrentImageChanged() while holding
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* mReentrantMonitor.
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*/
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already_AddRefed<Image> GetCurrentImage()
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{
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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nsRefPtr<Image> retval = mActiveImage;
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return retval.forget();
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}
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/**
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* Get the current image as a gfxASurface. This is useful for fallback
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* rendering.
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* This can only be called from the main thread, since cairo objects
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* can only be used from the main thread.
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* This is defined here and not on Image because it's possible (likely)
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* that some backends will make an Image "ready to draw" only when it
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* becomes the current image for an image container.
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* Returns null if there is no current image.
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* Returns the size in aSize.
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* The returned surface will never be modified. The caller must not
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* modify it.
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* Can be called on any thread. This method takes mReentrantMonitor
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* when accessing thread-shared state.
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*/
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already_AddRefed<gfxASurface> GetCurrentAsSurface(gfxIntSize* aSizeResult);
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/**
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* Returns the size of the image in pixels.
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* Can be called on any thread. This method takes mReentrantMonitor when accessing
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* thread-shared state.
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*/
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gfxIntSize GetCurrentSize();
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/**
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* Sets a size that the image is expected to be rendered at.
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* This is a hint for image backends to optimize scaling.
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* Default implementation in this class is to ignore the hint.
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* Can be called on any thread. This method takes mReentrantMonitor
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* when accessing thread-shared state.
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*/
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void SetScaleHint(const gfxIntSize& aScaleHint)
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{ mScaleHint = aScaleHint; }
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void SetImageFactory(ImageFactory *aFactory)
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{
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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mImageFactory = aFactory ? aFactory : new ImageFactory();
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}
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/**
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* Returns the time at which the currently contained image was first
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* painted. This is reset every time a new image is set as the current
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* image. Note this may return a null timestamp if the current image
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* has not yet been painted. Can be called from any thread.
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*/
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TimeStamp GetPaintTime() {
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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return mPaintTime;
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}
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/**
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* Returns the number of images which have been contained in this container
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* and painted at least once. Can be called from any thread.
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*/
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PRUint32 GetPaintCount() {
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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return mPaintCount;
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}
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/**
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* Increments mPaintCount if this is the first time aPainted has been
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* painted, and sets mPaintTime if the painted image is the current image.
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* current image. Can be called from any thread.
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*/
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void NotifyPaintedImage(Image* aPainted) {
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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nsRefPtr<Image> current = GetCurrentImage();
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if (aPainted == current) {
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if (mPaintTime.IsNull()) {
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mPaintTime = TimeStamp::Now();
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mPaintCount++;
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}
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} else if (!mPreviousImagePainted) {
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// While we were painting this image, the current image changed. We
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// still must count it as painted, but can't set mPaintTime, since we're
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// no longer the current image.
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mPaintCount++;
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mPreviousImagePainted = true;
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}
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}
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protected:
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typedef mozilla::ReentrantMonitor ReentrantMonitor;
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// ReentrantMonitor to protect thread safe access to the "current
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// image", and any other state which is shared between threads.
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ReentrantMonitor mReentrantMonitor;
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// Performs necessary housekeeping to ensure the painted frame statistics
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// are accurate. Must be called by SetCurrentImage() implementations with
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// mReentrantMonitor held.
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void CurrentImageChanged() {
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mReentrantMonitor.AssertCurrentThreadIn();
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mPreviousImagePainted = !mPaintTime.IsNull();
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mPaintTime = TimeStamp();
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}
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nsRefPtr<Image> mActiveImage;
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// Number of contained images that have been painted at least once. It's up
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// to the ImageContainer implementation to ensure accesses to this are
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// threadsafe.
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PRUint32 mPaintCount;
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// Time stamp at which the current image was first painted. It's up to the
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// ImageContainer implementation to ensure accesses to this are threadsafe.
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TimeStamp mPaintTime;
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// Denotes whether the previous image was painted.
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bool mPreviousImagePainted;
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// This is the image factory used by this container, layer managers using
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// this container can set an alternative image factory that will be used to
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// create images for this container.
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nsRefPtr<ImageFactory> mImageFactory;
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gfxIntSize mScaleHint;
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nsRefPtr<BufferRecycleBin> mRecycleBin;
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};
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/**
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* A Layer which renders an Image.
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*/
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class THEBES_API ImageLayer : public Layer {
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public:
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/**
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* CONSTRUCTION PHASE ONLY
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* Set the ImageContainer. aContainer must have the same layer manager
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* as this layer.
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*/
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void SetContainer(ImageContainer* aContainer)
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{
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mContainer = aContainer;
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}
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/**
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* CONSTRUCTION PHASE ONLY
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* Set the filter used to resample this image if necessary.
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*/
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void SetFilter(gfxPattern::GraphicsFilter aFilter) { mFilter = aFilter; }
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ImageContainer* GetContainer() { return mContainer; }
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gfxPattern::GraphicsFilter GetFilter() { return mFilter; }
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MOZ_LAYER_DECL_NAME("ImageLayer", TYPE_IMAGE)
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virtual void ComputeEffectiveTransforms(const gfx3DMatrix& aTransformToSurface)
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{
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// Snap image edges to pixel boundaries
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gfxRect snap(0, 0, 0, 0);
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if (mContainer) {
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gfxIntSize size = mContainer->GetCurrentSize();
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snap.SizeTo(gfxSize(size.width, size.height));
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}
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// Snap our local transform first, and snap the inherited transform as well.
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// This makes our snapping equivalent to what would happen if our content
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// was drawn into a ThebesLayer (gfxContext would snap using the local
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// transform, then we'd snap again when compositing the ThebesLayer).
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mEffectiveTransform =
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SnapTransform(GetLocalTransform(), snap, nsnull)*
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SnapTransform(aTransformToSurface, gfxRect(0, 0, 0, 0), nsnull);
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}
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protected:
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ImageLayer(LayerManager* aManager, void* aImplData)
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: Layer(aManager, aImplData), mFilter(gfxPattern::FILTER_GOOD) {}
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virtual nsACString& PrintInfo(nsACString& aTo, const char* aPrefix);
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nsRefPtr<ImageContainer> mContainer;
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gfxPattern::GraphicsFilter mFilter;
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};
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/****** Image subtypes for the different formats ******/
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/**
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* We assume that the image data is in the REC 470M color space (see
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* Theora specification, section 4.3.1).
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*
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* The YCbCr format can be:
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*
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* 4:4:4 - CbCr width/height are the same as Y.
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* 4:2:2 - CbCr width is half that of Y. Height is the same.
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* 4:2:0 - CbCr width and height is half that of Y.
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*
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* The color format is detected based on the height/width ratios
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* defined above.
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*
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* The Image that is rendered is the picture region defined by
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* mPicX, mPicY and mPicSize. The size of the rendered image is
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* mPicSize, not mYSize or mCbCrSize.
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*/
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class THEBES_API PlanarYCbCrImage : public Image {
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public:
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struct Data {
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// Luminance buffer
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PRUint8* mYChannel;
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PRInt32 mYStride;
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gfxIntSize mYSize;
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// Chroma buffers
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PRUint8* mCbChannel;
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PRUint8* mCrChannel;
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PRInt32 mCbCrStride;
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gfxIntSize mCbCrSize;
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// Picture region
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PRUint32 mPicX;
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PRUint32 mPicY;
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gfxIntSize mPicSize;
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StereoMode mStereoMode;
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nsIntRect GetPictureRect() const {
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return nsIntRect(mPicX, mPicY,
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mPicSize.width,
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mPicSize.height);
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}
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};
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enum {
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MAX_DIMENSION = 16384
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};
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~PlanarYCbCrImage();
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/**
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* This makes a copy of the data buffers, in order to support functioning
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* in all different layer managers.
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*/
|
|
virtual void SetData(const Data& aData);
|
|
|
|
/**
|
|
* Ask this Image to not convert YUV to RGB during SetData, and make
|
|
* the original data available through GetData. This is optional,
|
|
* and not all PlanarYCbCrImages will support it.
|
|
*/
|
|
virtual void SetDelayedConversion(bool aDelayed) { }
|
|
|
|
/**
|
|
* Grab the original YUV data. This is optional.
|
|
*/
|
|
virtual const Data* GetData() { return &mData; }
|
|
|
|
/**
|
|
* Make a copy of the YCbCr data into local storage.
|
|
*
|
|
* @param aData Input image data.
|
|
*/
|
|
void CopyData(const Data& aData);
|
|
|
|
/**
|
|
* Return a buffer to store image data in.
|
|
* The default implementation returns memory that can
|
|
* be freed wit delete[]
|
|
*/
|
|
virtual PRUint8* AllocateBuffer(PRUint32 aSize);
|
|
|
|
/**
|
|
* Return the number of bytes of heap memory used to store this image.
|
|
*/
|
|
virtual PRUint32 GetDataSize() { return mBufferSize; }
|
|
|
|
already_AddRefed<gfxASurface> GetAsSurface();
|
|
|
|
virtual gfxIntSize GetSize() { return mSize; }
|
|
|
|
void SetOffscreenFormat(gfxImageFormat aFormat) { mOffscreenFormat = aFormat; }
|
|
gfxImageFormat GetOffscreenFormat() { return mOffscreenFormat; }
|
|
|
|
// XXX - not easy to protect these sadly.
|
|
nsAutoArrayPtr<PRUint8> mBuffer;
|
|
PRUint32 mBufferSize;
|
|
Data mData;
|
|
gfxIntSize mSize;
|
|
gfxImageFormat mOffscreenFormat;
|
|
nsCountedRef<nsMainThreadSurfaceRef> mSurface;
|
|
nsRefPtr<BufferRecycleBin> mRecycleBin;
|
|
|
|
PlanarYCbCrImage(BufferRecycleBin *aRecycleBin);
|
|
};
|
|
|
|
/**
|
|
* Currently, the data in a CairoImage surface is treated as being in the
|
|
* device output color space. This class is very simple as all backends
|
|
* have to know about how to deal with drawing a cairo image.
|
|
*/
|
|
class THEBES_API CairoImage : public Image {
|
|
public:
|
|
struct Data {
|
|
gfxASurface* mSurface;
|
|
gfxIntSize mSize;
|
|
};
|
|
|
|
/**
|
|
* This can only be called on the main thread. It may add a reference
|
|
* to the surface (which will eventually be released on the main thread).
|
|
* The surface must not be modified after this call!!!
|
|
*/
|
|
void SetData(const Data& aData)
|
|
{
|
|
mSurface = aData.mSurface;
|
|
mSize = aData.mSize;
|
|
}
|
|
|
|
|
|
virtual already_AddRefed<gfxASurface> GetAsSurface()
|
|
{
|
|
NS_ASSERTION(NS_IsMainThread(), "Must be main thread");
|
|
nsRefPtr<gfxASurface> surface = mSurface.get();
|
|
return surface.forget();
|
|
}
|
|
|
|
gfxIntSize GetSize() { return mSize; }
|
|
|
|
CairoImage() : Image(NULL, CAIRO_SURFACE) {}
|
|
|
|
nsCountedRef<nsMainThreadSurfaceRef> mSurface;
|
|
gfxIntSize mSize;
|
|
};
|
|
|
|
#ifdef XP_MACOSX
|
|
class THEBES_API MacIOSurfaceImage : public Image {
|
|
public:
|
|
struct Data {
|
|
nsIOSurface* mIOSurface;
|
|
};
|
|
|
|
MacIOSurfaceImage()
|
|
: Image(NULL, MAC_IO_SURFACE)
|
|
, mSize(0, 0)
|
|
, mPluginInstanceOwner(NULL)
|
|
, mUpdateCallback(NULL)
|
|
, mDestroyCallback(NULL)
|
|
{}
|
|
|
|
virtual ~MacIOSurfaceImage()
|
|
{
|
|
if (mDestroyCallback) {
|
|
mDestroyCallback(mPluginInstanceOwner);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This can only be called on the main thread. It may add a reference
|
|
* to the surface (which will eventually be released on the main thread).
|
|
* The surface must not be modified after this call!!!
|
|
*/
|
|
virtual void SetData(const Data& aData);
|
|
|
|
/**
|
|
* Temporary hacks to force plugin drawing during an empty transaction.
|
|
* This should not be used for anything else, and will be removed
|
|
* when async plugin rendering is complete.
|
|
*/
|
|
typedef void (*UpdateSurfaceCallback)(ImageContainer* aContainer, void* aInstanceOwner);
|
|
virtual void SetUpdateCallback(UpdateSurfaceCallback aCallback, void* aInstanceOwner)
|
|
{
|
|
mUpdateCallback = aCallback;
|
|
mPluginInstanceOwner = aInstanceOwner;
|
|
}
|
|
|
|
typedef void (*DestroyCallback)(void* aInstanceOwner);
|
|
virtual void SetDestroyCallback(DestroyCallback aCallback)
|
|
{
|
|
mDestroyCallback = aCallback;
|
|
}
|
|
|
|
virtual gfxIntSize GetSize()
|
|
{
|
|
return mSize;
|
|
}
|
|
|
|
nsIOSurface* GetIOSurface()
|
|
{
|
|
return mIOSurface;
|
|
}
|
|
|
|
void Update(ImageContainer* aContainer);
|
|
|
|
virtual already_AddRefed<gfxASurface> GetAsSurface();
|
|
|
|
private:
|
|
gfxIntSize mSize;
|
|
nsRefPtr<nsIOSurface> mIOSurface;
|
|
void* mPluginInstanceOwner;
|
|
UpdateSurfaceCallback mUpdateCallback;
|
|
DestroyCallback mDestroyCallback;
|
|
};
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* GFX_IMAGELAYER_H */
|