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/*
* 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"
#include "../../string_base.h"
#include <vector>
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;
}
}
};
/** String iterator using Uniscribe as a backend. */
class UniscribeStringIterator : public StringIterator {
/** */
struct CharInfo {
bool word_stop : 1; ///< Code point is suitable as a word break.
bool char_stop : 1; ///< Code point is the start of a grapheme cluster, i.e. a "character".
};
std::vector<CharInfo> str_info; ///< Break information for each code point.
std::vector<size_t> utf16_to_utf8; ///< Mapping from UTF-16 code point position to index in the UTF-8 source string.
size_t cur_pos; ///< Current iteration position.
public:
void SetString(const char *s) override;
size_t SetCurPosition(size_t pos) override;
size_t Next(IterType what) override;
size_t Prev(IterType what) override;
};
#endif /* defined(WITH_UNISCRIBE) */
#endif /* STRING_UNISCRIBE_H */
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