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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /intl/lwbrk/nsPangoBreaker.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'intl/lwbrk/nsPangoBreaker.cpp')
-rw-r--r--intl/lwbrk/nsPangoBreaker.cpp61
1 files changed, 61 insertions, 0 deletions
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 <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, uint8_t(false), aLength * sizeof(uint8_t));
+
+ AutoTArray<PangoLogAttr, 2000> 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;
+ }
+ }
+ }
+}