michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsComplexBreaker.h"
michael@0: 
michael@0: #include <pango/pango-break.h>
michael@0: #include "nsUTF8Utils.h"
michael@0: #include "nsString.h"
michael@0: #include "nsTArray.h"
michael@0: 
michael@0: void
michael@0: NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,
michael@0:                         uint8_t* aBreakBefore)
michael@0: {
michael@0:   NS_ASSERTION(aText, "aText shouldn't be null");
michael@0: 
michael@0:   memset(aBreakBefore, false, aLength * sizeof(uint8_t));
michael@0: 
michael@0:   nsAutoTArray<PangoLogAttr, 2000> attrBuffer;
michael@0:   if (!attrBuffer.AppendElements(aLength + 1))
michael@0:     return;
michael@0: 
michael@0:   NS_ConvertUTF16toUTF8 aUTF8(aText, aLength);
michael@0: 
michael@0:   const gchar* p = aUTF8.Data();
michael@0:   const gchar* end = p + aUTF8.Length();
michael@0:   uint32_t     u16Offset = 0;
michael@0: 
michael@0:   static PangoLanguage* language = pango_language_from_string("en");
michael@0: 
michael@0:   while (p < end)
michael@0:   {
michael@0:     PangoLogAttr* attr = attrBuffer.Elements();
michael@0:     pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length());
michael@0: 
michael@0:     while (p < end)
michael@0:     {
michael@0:       aBreakBefore[u16Offset] = attr->is_line_break;
michael@0:       if (NS_IS_LOW_SURROGATE(aText[u16Offset]))
michael@0:         aBreakBefore[++u16Offset] = false; // Skip high surrogate
michael@0:       ++u16Offset;
michael@0: 
michael@0:       bool err;
michael@0:       uint32_t ch = UTF8CharEnumerator::NextChar(&p, end, &err);
michael@0:       ++attr;
michael@0: 
michael@0:       if (ch == 0 || err) {
michael@0:         // pango_break (pango 1.16.2) only analyses text before the
michael@0:         // first NUL (but sets one extra attr). Workaround loop to call
michael@0:         // pango_break again to analyse after the NUL is done somewhere else
michael@0:         // (gfx/thebes/gfxPangoFonts.cpp: SetupClusterBoundaries()).
michael@0:         // So, we do the same here for pango_get_log_attrs.
michael@0:         break;
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: }
michael@0: