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Diffstat (limited to 'src/os/windows/string_uniscribe.h')
-rw-r--r-- | src/os/windows/string_uniscribe.h | 70 |
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 */ |