/* -*- 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; } } } }