зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
3.6 KiB
C++
93 строки
3.6 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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* Karl Tomlinson <karlt+@karlt.net>
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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_CACHED_TEMP_SURFACE_H
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#define GFX_CACHED_TEMP_SURFACE_H
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#include "gfxASurface.h"
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#include "nsExpirationTracker.h"
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class gfxContext;
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/**
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* This class can be used to cache double-buffering back surfaces.
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*
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* Large resource allocations may have an overhead that can be avoided by
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* caching. Caching also alows the system to use history in deciding whether
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* to manage the surfaces in video or system memory.
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*
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* However, because we don't want to set aside megabytes of unused resources
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* unncessarily, these surfaces are released on a timer.
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*/
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class THEBES_API gfxCachedTempSurface {
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public:
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/**
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* Returns a context for a surface that can be efficiently copied to
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* |aSimilarTo|.
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*
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* When |aContentType| has an alpha component, the surface will be cleared.
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* For opaque surfaces, the initial surface contents are undefined.
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* When |aContentType| differs in different invocations this is handled
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* appropriately, creating a new surface if necessary.
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*
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* |aSimilarTo| should be of the same gfxSurfaceType in each invocation.
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* Because the cached surface may have been created during a previous
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* invocation, this will not be efficient if the new |aSimilarTo| has a
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* different format.
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*/
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already_AddRefed<gfxContext> Get(gfxASurface::gfxContentType aContentType,
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const gfxRect& aRect,
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gfxASurface* aSimilarTo);
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void Expire() { mSurface = nsnull; }
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nsExpirationState* GetExpirationState() { return &mExpirationState; }
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~gfxCachedTempSurface();
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bool IsSurface(gfxASurface* aSurface) { return mSurface == aSurface; }
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private:
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nsRefPtr<gfxASurface> mSurface;
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gfxIntSize mSize;
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nsExpirationState mExpirationState;
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#ifdef DEBUG
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gfxASurface::gfxSurfaceType mType;
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#endif
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};
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#endif /* GFX_CACHED_TEMP_SURFACE_H */
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