mirror of
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94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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.org code.
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*
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* The Initial Developer of the Original Code is
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* Theppitak Karoonboonyanan <thep@linux.thai.net>.
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* - Theppitak Karoonboonyanan <thep@linux.thai.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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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#include "nsComplexBreaker.h"
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#include <pango/pango-break.h>
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#include "nsUTF8Utils.h"
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#include "nsString.h"
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#include "nsTArray.h"
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void
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NS_GetComplexLineBreaks(const PRUnichar* aText, PRUint32 aLength,
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PRPackedBool* aBreakBefore)
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{
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NS_ASSERTION(aText, "aText shouldn't be null");
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memset(aBreakBefore, PR_FALSE, aLength * sizeof(PRPackedBool));
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nsAutoTArray<PangoLogAttr, 2000> attrBuffer;
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if (!attrBuffer.AppendElements(aLength + 1))
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return;
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NS_ConvertUTF16toUTF8 aUTF8(aText, aLength);
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const gchar* p = aUTF8.Data();
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const gchar* end = p + aUTF8.Length();
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PRUint32 u16Offset = 0;
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static PangoLanguage* language = pango_language_from_string("en");
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while (p < end)
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{
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PangoLogAttr* attr = attrBuffer.Elements();
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pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length());
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while (p < end)
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{
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aBreakBefore[u16Offset] = attr->is_line_break;
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if (NS_IS_LOW_SURROGATE(aText[u16Offset]))
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aBreakBefore[++u16Offset] = PR_FALSE; // Skip high surrogate
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++u16Offset;
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PRBool err;
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PRUint32 ch = UTF8CharEnumerator::NextChar(&p, end, &err);
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++attr;
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if (ch == 0 || err) {
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// pango_break (pango 1.16.2) only analyses text before the
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// first NUL (but sets one extra attr). Workaround loop to call
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// pango_break again to analyse after the NUL is done somewhere else
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// (gfx/thebes/src/gfxPangoFonts.cpp: SetupClusterBoundaries()).
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// So, we do the same here for pango_get_log_attrs.
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break;
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}
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}
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}
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}
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