intl/lwbrk/src/nsPangoBreaker.cpp@b8a032363ba2 (annotated)
intl/lwbrk/src/nsPangoBreaker.cpp
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "nsComplexBreaker.h" |
| michael@0 | 7 | |
| michael@0 | 8 | #include <pango/pango-break.h> |
| michael@0 | 9 | #include "nsUTF8Utils.h" |
| michael@0 | 10 | #include "nsString.h" |
| michael@0 | 11 | #include "nsTArray.h" |
| michael@0 | 12 | |
| michael@0 | 13 | void |
| michael@0 | 14 | NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength, |
| michael@0 | 15 | uint8_t* aBreakBefore) |
| michael@0 | 16 | { |
| michael@0 | 17 | NS_ASSERTION(aText, "aText shouldn't be null"); |
| michael@0 | 18 | |
| michael@0 | 19 | memset(aBreakBefore, false, aLength * sizeof(uint8_t)); |
| michael@0 | 20 | |
| michael@0 | 21 | nsAutoTArray<PangoLogAttr, 2000> attrBuffer; |
| michael@0 | 22 | if (!attrBuffer.AppendElements(aLength + 1)) |
| michael@0 | 23 | return; |
| michael@0 | 24 | |
| michael@0 | 25 | NS_ConvertUTF16toUTF8 aUTF8(aText, aLength); |
| michael@0 | 26 | |
| michael@0 | 27 | const gchar* p = aUTF8.Data(); |
| michael@0 | 28 | const gchar* end = p + aUTF8.Length(); |
| michael@0 | 29 | uint32_t u16Offset = 0; |
| michael@0 | 30 | |
| michael@0 | 31 | static PangoLanguage* language = pango_language_from_string("en"); |
| michael@0 | 32 | |
| michael@0 | 33 | while (p < end) |
| michael@0 | 34 | { |
| michael@0 | 35 | PangoLogAttr* attr = attrBuffer.Elements(); |
| michael@0 | 36 | pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length()); |
| michael@0 | 37 | |
| michael@0 | 38 | while (p < end) |
| michael@0 | 39 | { |
| michael@0 | 40 | aBreakBefore[u16Offset] = attr->is_line_break; |
| michael@0 | 41 | if (NS_IS_LOW_SURROGATE(aText[u16Offset])) |
| michael@0 | 42 | aBreakBefore[++u16Offset] = false; // Skip high surrogate |
| michael@0 | 43 | ++u16Offset; |
| michael@0 | 44 | |
| michael@0 | 45 | bool err; |
| michael@0 | 46 | uint32_t ch = UTF8CharEnumerator::NextChar(&p, end, &err); |
| michael@0 | 47 | ++attr; |
| michael@0 | 48 | |
| michael@0 | 49 | if (ch == 0 || err) { |
| michael@0 | 50 | // pango_break (pango 1.16.2) only analyses text before the |
| michael@0 | 51 | // first NUL (but sets one extra attr). Workaround loop to call |
| michael@0 | 52 | // pango_break again to analyse after the NUL is done somewhere else |
| michael@0 | 53 | // (gfx/thebes/gfxPangoFonts.cpp: SetupClusterBoundaries()). |
| michael@0 | 54 | // So, we do the same here for pango_get_log_attrs. |
| michael@0 | 55 | break; |
| michael@0 | 56 | } |
| michael@0 | 57 | } |
| michael@0 | 58 | } |
| michael@0 | 59 | } |
| michael@0 | 60 |
