1 files changed, 70 insertions, 0 deletions
diff --git a/src/os/windows/string_uniscribe.h b/src/os/windows/string_uniscribe.h
new file mode 100644
index 000000000..a43a2a96e
--- /dev/null
+++ b/src/os/windows/string_uniscribe.h
@@ -0,0 +1,70 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file string_uniscribe.h Functions related to laying out text on Win32. */
+
+#ifndef STRING_UNISCRIBE_H
+#define STRING_UNISCRIBE_H
+
+#if defined(WITH_UNISCRIBE)
+
+#include "../../gfx_layout.h"
+
+
+void UniscribeResetScriptCache(FontSize size);
+
+
+/**
+ * Helper class to construct a new #UniscribeParagraphLayout.
+ */
+class UniscribeParagraphLayoutFactory {
+public:
+	/** Helper for GetLayouter, to get the right type. */
+	typedef wchar_t CharType;
+	/** Helper for GetLayouter, to get whether the layouter supports RTL. */
+	static const bool SUPPORTS_RTL = true;
+
+	/**
+	* Get the actual ParagraphLayout for the given buffer.
+	* @param buff The begin of the buffer.
+	* @param buff_end The location after the last element in the buffer.
+	* @param fontMapping THe mapping of the fonts.
+	* @return The ParagraphLayout instance.
+	*/
+	static ParagraphLayouter *GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping);
+
+	/**
+	* Append a wide character to the internal buffer.
+	* @param buff        The buffer to append to.
+	* @param buffer_last The end of the buffer.
+	* @param c           The character to add.
+	* @return The number of buffer spaces that were used.
+	*/
+	static size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, WChar c)
+	{
+		if (c >= 0x010000U) {
+			/* Character is encoded using surrogates in UTF-16. */
+			if (buff + 1 <= buffer_last) {
+				buff[0] = (CharType)(((c - 0x010000U) >> 10) + 0xD800);
+				buff[1] = (CharType)(((c - 0x010000U) & 0x3FF) + 0xDC00);
+			} else {
+				/* Not enough space in buffer. */
+				*buff = 0;
+			}
+			return 2;
+		} else {
+			*buff = (CharType)(c & 0xFFFF);
+			return 1;
+		}
+	}
+};
+
+#endif /* defined(WITH_UNISCRIBE) */
+
+#endif /* STRING_UNISCRIBE_H */