1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/lwbrk/src/nsPangoBreaker.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,60 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsComplexBreaker.h"
1.10 +
1.11 +#include <pango/pango-break.h>
1.12 +#include "nsUTF8Utils.h"
1.13 +#include "nsString.h"
1.14 +#include "nsTArray.h"
1.15 +
1.16 +void
1.17 +NS_GetComplexLineBreaks(const char16_t* aText, uint32_t aLength,
1.18 + uint8_t* aBreakBefore)
1.19 +{
1.20 + NS_ASSERTION(aText, "aText shouldn't be null");
1.21 +
1.22 + memset(aBreakBefore, false, aLength * sizeof(uint8_t));
1.23 +
1.24 + nsAutoTArray<PangoLogAttr, 2000> attrBuffer;
1.25 + if (!attrBuffer.AppendElements(aLength + 1))
1.26 + return;
1.27 +
1.28 + NS_ConvertUTF16toUTF8 aUTF8(aText, aLength);
1.29 +
1.30 + const gchar* p = aUTF8.Data();
1.31 + const gchar* end = p + aUTF8.Length();
1.32 + uint32_t u16Offset = 0;
1.33 +
1.34 + static PangoLanguage* language = pango_language_from_string("en");
1.35 +
1.36 + while (p < end)
1.37 + {
1.38 + PangoLogAttr* attr = attrBuffer.Elements();
1.39 + pango_get_log_attrs(p, end - p, -1, language, attr, attrBuffer.Length());
1.40 +
1.41 + while (p < end)
1.42 + {
1.43 + aBreakBefore[u16Offset] = attr->is_line_break;
1.44 + if (NS_IS_LOW_SURROGATE(aText[u16Offset]))
1.45 + aBreakBefore[++u16Offset] = false; // Skip high surrogate
1.46 + ++u16Offset;
1.47 +
1.48 + bool err;
1.49 + uint32_t ch = UTF8CharEnumerator::NextChar(&p, end, &err);
1.50 + ++attr;
1.51 +
1.52 + if (ch == 0 || err) {
1.53 + // pango_break (pango 1.16.2) only analyses text before the
1.54 + // first NUL (but sets one extra attr). Workaround loop to call
1.55 + // pango_break again to analyse after the NUL is done somewhere else
1.56 + // (gfx/thebes/gfxPangoFonts.cpp: SetupClusterBoundaries()).
1.57 + // So, we do the same here for pango_get_log_attrs.
1.58 + break;
1.59 + }
1.60 + }
1.61 + }
1.62 +}
1.63 +
