gecko/gfx/thebes/gfxTextRunWordCache.h

125 lines
4.9 KiB
C++

/* -*- 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>
* Ehsan Akhgari <ehsan.akhgari@gmail.com>
* Jonathan Kew <jfkthame@gmail.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 ***** */
#ifndef GFX_TEXT_RUN_WORD_CACHE_H
#define GFX_TEXT_RUN_WORD_CACHE_H
#include "gfxFont.h"
/**
* Cache individual "words" (strings delimited by white-space or white-space-like
* characters that don't involve kerning or ligatures) in textruns.
*/
class THEBES_API gfxTextRunWordCache {
public:
enum {
TEXT_IN_CACHE = 0x10000000,
/**
* nsTextFrameThebes sets these, but they're defined here rather than in
* nsTextFrameUtils.h because the cache also needs to check the _INCOMING flag
*/
TEXT_TRAILING_ARABICCHAR = 0x20000000,
/**
* When set, the previous character for this textrun was an Arabic
* character. This is used for the context detection necessary for
* bidi.numeral implementation.
*/
TEXT_INCOMING_ARABICCHAR = 0x40000000,
TEXT_UNUSED_FLAGS = 0x80000000
};
/**
* Create a textrun using cached words.
* Invalid characters (see gfxFontGroup::IsInvalidChar) will be automatically
* treated as invisible missing.
* @param aFlags the flag TEXT_IS_ASCII must be set by the caller,
* if applicable; TEXT_IN_CACHE is added if we have a reference to
* the textrun in the cache and RemoveTextRun must be called when the
* textrun dies.
*/
static gfxTextRun *MakeTextRun(const PRUnichar *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags);
/**
* Create a textrun using cached words.
* Invalid characters (see gfxFontGroup::IsInvalidChar) will be automatically
* treated as invisible missing.
* @param aFlags the flag TEXT_IS_ASCII must be set by the caller,
* if applicable; TEXT_IN_CACHE is added if we have a reference to
* the textrun in the cache and RemoveTextRun must be called when the
* textrun dies.
*/
static gfxTextRun *MakeTextRun(const PRUint8 *aText, PRUint32 aLength,
gfxFontGroup *aFontGroup,
const gfxFontGroup::Parameters *aParams,
PRUint32 aFlags);
/**
* Remove a textrun from the cache. This must be called before aTextRun
* is deleted! The text in the textrun must still be valid.
*/
static void RemoveTextRun(gfxTextRun *aTextRun);
/**
* Flush the textrun cache. This must be called if a configuration
* change that would affect textruns is applied.
*/
static void Flush();
/**
* If aTotal is NULL, just clears the TEXT_RUN_MEMORY_ACCOUNTED flag
* on each textRun found.
* If aTotal is non-NULL, adds the storage used for each textRun to the
* total, and sets the TEXT_RUN_MEMORY_ACCOUNTED flag to avoid double-
* accounting. (Runs with this flag already set will be skipped.)
*/
static void ComputeStorage(PRUint64 *aTotal);
protected:
friend class gfxPlatform;
static nsresult Init();
static void Shutdown();
};
#endif /* GFX_TEXT_RUN_WORD_CACHE_H */