зеркало из https://github.com/mozilla/gecko-dev.git
125 строки
5.0 KiB
C++
125 строки
5.0 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 Foundation 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) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com>
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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_TEXT_RUN_CACHE_H
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#define GFX_TEXT_RUN_CACHE_H
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#include "gfxFont.h"
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/**
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* A simple textrun cache for textruns that do not carry state
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* (e.g., actual or potential linebreaks) and do not need complex initialization.
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* The lifetimes of these textruns are managed by the cache (they are auto-expired
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* after a certain period of time).
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*/
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class THEBES_API gfxTextRunCache {
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public:
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/**
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* Get a textrun for the given text, using a global cache. The textrun
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* must be released via ReleaseTextRun, not deleted.
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* Do not set any state in the textrun (e.g. actual or potential linebreaks).
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* Flags IS_8BIT, IS_ASCII and HAS_SURROGATES are automatically set
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* appropriately.
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* Flag IS_PERSISTENT must NOT be set unless aText is guaranteed to live
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* forever.
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* The string can contain any characters, invalid ones will be stripped
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* properly.
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*/
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static gfxTextRun *MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
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gfxFontGroup *aFontGroup,
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gfxContext *aRefContext,
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PRUint32 aAppUnitsPerDevUnit,
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PRUint32 aFlags);
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/**
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* As above, but allows a full Parameters object to be passed in.
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*/
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static gfxTextRun *MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
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gfxFontGroup *aFontGroup,
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const gfxTextRunFactory::Parameters* aParams,
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PRUint32 aFlags);
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/**
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* Get a textrun for the given text, using a global cache. The textrun
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* must be released via ReleaseTextRun, not deleted.
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* Do not set any state in the textrun (e.g. actual or potential linebreaks).
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* Flags IS_8BIT, IS_ASCII and HAS_SURROGATES are automatically set
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* appropriately.
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* Flag IS_PERSISTENT must NOT be set unless aText is guaranteed to live
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* forever.
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* The string can contain any characters, invalid ones will be stripped
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* properly.
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*/
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static gfxTextRun *MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
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gfxFontGroup *aFontGroup,
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gfxContext *aRefContext,
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PRUint32 aAppUnitsPerDevUnit,
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PRUint32 aFlags);
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/**
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* Release a previously acquired textrun. Consider using AutoTextRun
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* instead of calling this.
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*/
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static void ReleaseTextRun(gfxTextRun *aTextRun);
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class AutoTextRun {
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public:
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AutoTextRun(gfxTextRun *aTextRun) : mTextRun(aTextRun) {}
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AutoTextRun() : mTextRun(nsnull) {}
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AutoTextRun& operator=(gfxTextRun *aTextRun) {
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gfxTextRunCache::ReleaseTextRun(mTextRun);
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mTextRun = aTextRun;
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return *this;
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}
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~AutoTextRun() {
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gfxTextRunCache::ReleaseTextRun(mTextRun);
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}
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gfxTextRun *get() { return mTextRun; }
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gfxTextRun *operator->() { return mTextRun; }
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private:
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gfxTextRun *mTextRun;
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};
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protected:
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friend class gfxPlatform;
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static nsresult Init();
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static void Shutdown();
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};
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#endif /* GFX_TEXT_RUN_CACHE_H */
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