gecko-dev/gfx/thebes/gfxTextRunCache.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** 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,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vladimir Vukicevic <vladimir@pobox.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxTextRunCache.h"
#include "gfxTextRunWordCache.h"
#include "nsExpirationTracker.h"
enum {
TEXTRUN_TIMEOUT_MS = 10 * 1000 // textruns expire after 3 * this period
};
/*
* Cache textruns and expire them after a period of no use
*/
class TextRunExpiringCache : public nsExpirationTracker<gfxTextRun,3> {
public:
TextRunExpiringCache()
: nsExpirationTracker<gfxTextRun,3>(TEXTRUN_TIMEOUT_MS) {}
~TextRunExpiringCache() {
AgeAllGenerations();
}
// This gets called when the timeout has expired on a gfxTextRun
virtual void NotifyExpired(gfxTextRun *aTextRun) {
RemoveObject(aTextRun);
gfxTextRunWordCache::RemoveTextRun(aTextRun);
delete aTextRun;
}
};
static TextRunExpiringCache *gTextRunCache = nsnull;
gfxTextRun *
gfxTextRunCache::MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxTextRunFactory::Parameters* aParams,
PRUint32 aFlags)
{
if (!gTextRunCache)
return nsnull;
return gfxTextRunWordCache::MakeTextRun(aText, aLength, aFontGroup,
aParams, aFlags);
}
gfxTextRun *
gfxTextRunCache::MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
gfxContext *aRefContext,
PRUint32 aAppUnitsPerDevUnit,
PRUint32 aFlags)
{
if (!gTextRunCache)
return nsnull;
gfxTextRunFactory::Parameters params = {
aRefContext, nsnull, nsnull, nsnull, 0, aAppUnitsPerDevUnit
};
return gfxTextRunWordCache::MakeTextRun(aText, aLength, aFontGroup,
&params, aFlags);
}
gfxTextRun *
gfxTextRunCache::MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
gfxContext *aRefContext,
PRUint32 aAppUnitsPerDevUnit,
PRUint32 aFlags)
{
if (!gTextRunCache)
return nsnull;
gfxTextRunFactory::Parameters params = {
aRefContext, nsnull, nsnull, nsnull, 0, aAppUnitsPerDevUnit
};
return gfxTextRunWordCache::MakeTextRun(aText, aLength, aFontGroup,
&params, aFlags);
}
void
gfxTextRunCache::ReleaseTextRun(gfxTextRun *aTextRun)
{
if (!aTextRun)
return;
if (!(aTextRun->GetFlags() & gfxTextRunWordCache::TEXT_IN_CACHE)) {
delete aTextRun;
return;
}
nsresult rv = gTextRunCache->AddObject(aTextRun);
if (NS_FAILED(rv)) {
delete aTextRun;
return;
}
}
nsresult
gfxTextRunCache::Init()
{
gTextRunCache = new TextRunExpiringCache();
return gTextRunCache ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
void
gfxTextRunCache::Shutdown()
{
delete gTextRunCache;
gTextRunCache = nsnull;
}