1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsComplexBreaker.h"
#include <pango/pango-break.h>
#include "nsUTF8Utils.h"
#include "nsString.h"
#include "nsTArray.h"
void
NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,
uint8_t* aBreakBefore)
{
NS_ASSERTION(aText, "aText shouldn't be null");
memset(aBreakBefore, false, aLength * sizeof(uint8_t));
AutoTArray<PangoLogAttr, 2000> attrBuffer;
if (!attrBuffer.AppendElements(aLength + 1))
return;
NS_ConvertUTF16toUTF8 aUTF8(aText, aLength);
const gchar* p = aUTF8.Data();
const gchar* end = p + aUTF8.Length();
uint32_t u16Offset = 0;
static PangoLanguage* language = pango_language_from_string("en");
while (p < end)
{
PangoLogAttr* attr = attrBuffer.Elements();
pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length());
while (p < end)
{
aBreakBefore[u16Offset] = attr->is_line_break;
if (NS_IS_LOW_SURROGATE(aText[u16Offset]))
aBreakBefore[++u16Offset] = false; // Skip high surrogate
++u16Offset;
bool err;
uint32_t ch = UTF8CharEnumerator::NextChar(&p, end, &err);
++attr;
if (ch == 0 || err) {
// pango_break (pango 1.16.2) only analyses text before the
// first NUL (but sets one extra attr). Workaround loop to call
// pango_break again to analyse after the NUL is done somewhere else
// (gfx/thebes/gfxFontconfigFonts.cpp: SetupClusterBoundaries()).
// So, we do the same here for pango_get_log_attrs.
break;
}
}
}
}
|
