/usr/include/thunderbird-11.0.1/gfxCachedTempSurface.h is in thunderbird-dev 11.0.1+build1-0ubuntu2.
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* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
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* for the specific language governing rights and limitations under the
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* The Original Code is Mozilla Corporation code.
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* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
* Karl Tomlinson <karlt+@karlt.net>
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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#ifndef GFX_CACHED_TEMP_SURFACE_H
#define GFX_CACHED_TEMP_SURFACE_H
#include "gfxASurface.h"
#include "nsExpirationTracker.h"
class gfxContext;
/**
* This class can be used to cache double-buffering back surfaces.
*
* Large resource allocations may have an overhead that can be avoided by
* caching. Caching also alows the system to use history in deciding whether
* to manage the surfaces in video or system memory.
*
* However, because we don't want to set aside megabytes of unused resources
* unncessarily, these surfaces are released on a timer.
*/
class THEBES_API gfxCachedTempSurface {
public:
/**
* Returns a context for a surface that can be efficiently copied to
* |aSimilarTo|.
*
* When |aContentType| has an alpha component, the surface will be cleared.
* For opaque surfaces, the initial surface contents are undefined.
* When |aContentType| differs in different invocations this is handled
* appropriately, creating a new surface if necessary.
*
* |aSimilarTo| should be of the same gfxSurfaceType in each invocation.
* Because the cached surface may have been created during a previous
* invocation, this will not be efficient if the new |aSimilarTo| has a
* different format.
*/
already_AddRefed<gfxContext> Get(gfxASurface::gfxContentType aContentType,
const gfxRect& aRect,
gfxASurface* aSimilarTo);
void Expire() { mSurface = nsnull; }
nsExpirationState* GetExpirationState() { return &mExpirationState; }
~gfxCachedTempSurface();
bool IsSurface(gfxASurface* aSurface) { return mSurface == aSurface; }
private:
nsRefPtr<gfxASurface> mSurface;
gfxIntSize mSize;
nsExpirationState mExpirationState;
#ifdef DEBUG
gfxASurface::gfxSurfaceType mType;
#endif
};
#endif /* GFX_CACHED_TEMP_SURFACE_H */
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