From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- intl/lwbrk/nsPangoBreaker.cpp | 61 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 intl/lwbrk/nsPangoBreaker.cpp (limited to 'intl/lwbrk/nsPangoBreaker.cpp') diff --git a/intl/lwbrk/nsPangoBreaker.cpp b/intl/lwbrk/nsPangoBreaker.cpp new file mode 100644 index 0000000000..e098a11e58 --- /dev/null +++ b/intl/lwbrk/nsPangoBreaker.cpp @@ -0,0 +1,61 @@ +/* -*- 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 +#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, uint8_t(false), aLength * sizeof(uint8_t)); + + AutoTArray attrBuffer; + // XXX(Bug 1631371) Check if this should use a fallible operation as it + // pretended earlier. + attrBuffer.AppendElements(aLength + 1); + // `PangoLogAttr` doesn't have a default constructor (it is a C struct), so + // we need to manually initialize the new elements. See bug 1808182. + memset(attrBuffer.Elements(), 0, attrBuffer.Length() * sizeof(PangoLogAttr)); + + 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; + + // We're iterating over text obtained from NS_ConvertUTF16toUTF8, + // so we know we have valid UTF-8 and don't need to check for + // errors. + uint32_t ch = UTF8CharEnumerator::NextChar(&p, end); + ++attr; + + if (!ch) { + // 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; + } + } + } +} -- cgit v1.2.3