gecko-dev/gfx/thebes/gfxScriptItemizer.h

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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
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* Software distributed under the License is distributed on an "AS IS" basis,
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* The Original Code is Mozilla Corporation code.
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* The Initial Developer of the Original Code is Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
* Jonathan Kew <jfkthame@gmail.com>
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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*
* This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
* for use within Mozilla Gecko, separate from a standard ICU build.
*
* The original ICU license of the code follows:
*
* ICU License - ICU 1.8.1 and later
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* COPYRIGHT AND PERMISSION NOTICE
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* Copyright (c) 1995-2009 International Business Machines Corporation and
* others
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* All rights reserved.
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* copy of this software and associated documentation files (the "Software"),
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#ifndef GFX_SCRIPTITEMIZER_H
#define GFX_SCRIPTITEMIZER_H
#include "prtypes.h"
#include "harfbuzz/hb.h"
#define PAREN_STACK_DEPTH 32
class gfxScriptItemizer
{
public:
gfxScriptItemizer(const PRUnichar *src, PRUint32 length);
void SetText(const PRUnichar *src, PRUint32 length);
PRBool Next(PRUint32& aRunStart, PRUint32& aRunLimit,
PRInt32& aRunScript);
protected:
void reset() {
scriptStart = 0;
scriptLimit = 0;
scriptCode = PRInt32(HB_SCRIPT_INVALID_CODE);
parenSP = -1;
pushCount = 0;
fixupCount = 0;
}
void push(PRInt32 pairIndex, PRInt32 scriptCode);
void pop();
void fixup(PRInt32 scriptCode);
struct ParenStackEntry {
PRInt32 pairIndex;
PRInt32 scriptCode;
};
const PRUnichar *textPtr;
PRUint32 textLength;
PRUint32 scriptStart;
PRUint32 scriptLimit;
PRInt32 scriptCode;
struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
PRUint32 parenSP;
PRUint32 pushCount;
PRUint32 fixupCount;
};
#endif /* GFX_SCRIPTITEMIZER_H */