1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is mozilla.org code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Theppitak Karoonboonyanan <thep@linux.thai.net>.
19 : * Portions created by the Initial Developer are Copyright (C) 2007
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * - Theppitak Karoonboonyanan <thep@linux.thai.net>
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either of the GNU General Public License Version 2 or later (the "GPL"),
27 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
29 : * of those above. If you wish to allow use of your version of this file only
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 :
39 : #include "nsComplexBreaker.h"
40 :
41 : #include <pango/pango-break.h>
42 : #include "nsUTF8Utils.h"
43 : #include "nsString.h"
44 : #include "nsTArray.h"
45 :
46 : void
47 0 : NS_GetComplexLineBreaks(const PRUnichar* aText, PRUint32 aLength,
48 : PRUint8* aBreakBefore)
49 : {
50 0 : NS_ASSERTION(aText, "aText shouldn't be null");
51 :
52 0 : memset(aBreakBefore, false, aLength * sizeof(PRUint8));
53 :
54 0 : nsAutoTArray<PangoLogAttr, 2000> attrBuffer;
55 0 : if (!attrBuffer.AppendElements(aLength + 1))
56 : return;
57 :
58 0 : NS_ConvertUTF16toUTF8 aUTF8(aText, aLength);
59 :
60 0 : const gchar* p = aUTF8.Data();
61 0 : const gchar* end = p + aUTF8.Length();
62 0 : PRUint32 u16Offset = 0;
63 :
64 0 : static PangoLanguage* language = pango_language_from_string("en");
65 :
66 0 : while (p < end)
67 : {
68 0 : PangoLogAttr* attr = attrBuffer.Elements();
69 0 : pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length());
70 :
71 0 : while (p < end)
72 : {
73 0 : aBreakBefore[u16Offset] = attr->is_line_break;
74 0 : if (NS_IS_LOW_SURROGATE(aText[u16Offset]))
75 0 : aBreakBefore[++u16Offset] = false; // Skip high surrogate
76 0 : ++u16Offset;
77 :
78 : bool err;
79 0 : PRUint32 ch = UTF8CharEnumerator::NextChar(&p, end, &err);
80 0 : ++attr;
81 :
82 0 : if (ch == 0 || err) {
83 : // pango_break (pango 1.16.2) only analyses text before the
84 : // first NUL (but sets one extra attr). Workaround loop to call
85 : // pango_break again to analyse after the NUL is done somewhere else
86 : // (gfx/thebes/gfxPangoFonts.cpp: SetupClusterBoundaries()).
87 : // So, we do the same here for pango_get_log_attrs.
88 0 : break;
89 : }
90 : }
91 : }
92 : }
93 :
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