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comparison: intl/lwbrk/src/nsPangoBreaker.cpp
intl/lwbrk/src/nsPangoBreaker.cpp
- changeset 0
- 6474c204b198
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| 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/. */ | |
| 5 | |
| 6 #include "nsComplexBreaker.h" | |
| 7 | |
| 8 #include <pango/pango-break.h> | |
| 9 #include "nsUTF8Utils.h" | |
| 10 #include "nsString.h" | |
| 11 #include "nsTArray.h" | |
| 12 | |
| 13 void | |
| 14 NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength, | |
| 15 uint8_t* aBreakBefore) | |
| 16 { | |
| 17 NS_ASSERTION(aText, "aText shouldn't be null"); | |
| 18 | |
| 19 memset(aBreakBefore, false, aLength * sizeof(uint8_t)); | |
| 20 | |
| 21 nsAutoTArray<PangoLogAttr, 2000> attrBuffer; | |
| 22 if (!attrBuffer.AppendElements(aLength + 1)) | |
| 23 return; | |
| 24 | |
| 25 NS_ConvertUTF16toUTF8 aUTF8(aText, aLength); | |
| 26 | |
| 27 const gchar* p = aUTF8.Data(); | |
| 28 const gchar* end = p + aUTF8.Length(); | |
| 29 uint32_t u16Offset = 0; | |
| 30 | |
| 31 static PangoLanguage* language = pango_language_from_string("en"); | |
| 32 | |
| 33 while (p < end) | |
| 34 { | |
| 35 PangoLogAttr* attr = attrBuffer.Elements(); | |
| 36 pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length()); | |
| 37 | |
| 38 while (p < end) | |
| 39 { | |
| 40 aBreakBefore[u16Offset] = attr->is_line_break; | |
| 41 if (NS_IS_LOW_SURROGATE(aText[u16Offset])) | |
| 42 aBreakBefore[++u16Offset] = false; // Skip high surrogate | |
| 43 ++u16Offset; | |
| 44 | |
| 45 bool err; | |
| 46 uint32_t ch = UTF8CharEnumerator::NextChar(&p, end, &err); | |
| 47 ++attr; | |
| 48 | |
| 49 if (ch == 0 || err) { | |
| 50 // pango_break (pango 1.16.2) only analyses text before the | |
| 51 // first NUL (but sets one extra attr). Workaround loop to call | |
| 52 // pango_break again to analyse after the NUL is done somewhere else | |
| 53 // (gfx/thebes/gfxPangoFonts.cpp: SetupClusterBoundaries()). | |
| 54 // So, we do the same here for pango_get_log_attrs. | |
| 55 break; | |
| 56 } | |
| 57 } | |
| 58 } | |
| 59 } | |
| 60 |
