1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 #include "nsComplexBreaker.h"
8 #include <pango/pango-break.h>
9 #include "nsUTF8Utils.h"
13 void NS_GetComplexLineBreaks(const char16_t
* aText
, uint32_t aLength
,
14 uint8_t* aBreakBefore
) {
15 NS_ASSERTION(aText
, "aText shouldn't be null");
17 memset(aBreakBefore
, false, aLength
* sizeof(uint8_t));
19 AutoTArray
<PangoLogAttr
, 2000> attrBuffer
;
20 // XXX(Bug 1631371) Check if this should use a fallible operation as it
22 attrBuffer
.AppendElements(aLength
+ 1);
24 NS_ConvertUTF16toUTF8
aUTF8(aText
, aLength
);
26 const gchar
* p
= aUTF8
.Data();
27 const gchar
* end
= p
+ aUTF8
.Length();
28 uint32_t u16Offset
= 0;
30 static PangoLanguage
* language
= pango_language_from_string("en");
33 PangoLogAttr
* attr
= attrBuffer
.Elements();
34 pango_get_log_attrs(p
, end
- p
, -1, language
, attr
, attrBuffer
.Length());
37 aBreakBefore
[u16Offset
] = attr
->is_line_break
;
38 if (NS_IS_LOW_SURROGATE(aText
[u16Offset
]))
39 aBreakBefore
[++u16Offset
] = false; // Skip high surrogate
42 // We're iterating over text obtained from NS_ConvertUTF16toUTF8,
43 // so we know we have valid UTF-8 and don't need to check for
45 uint32_t ch
= UTF8CharEnumerator::NextChar(&p
, end
);
49 // pango_break (pango 1.16.2) only analyses text before the
50 // first NUL (but sets one extra attr). Workaround loop to call
51 // pango_break again to analyse after the NUL is done somewhere else
52 // (gfx/thebes/gfxFontconfigFonts.cpp: SetupClusterBoundaries()).
53 // So, we do the same here for pango_get_log_attrs.