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