mirror of https://github.com/OpenTTD/OpenTTD.git
87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file string_uniscribe.h Functions related to laying out text on Win32. */
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#ifndef STRING_UNISCRIBE_H
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#define STRING_UNISCRIBE_H
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#include "../../gfx_layout.h"
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#include "../../string_base.h"
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void UniscribeResetScriptCache(FontSize size);
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/**
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* Helper class to construct a new #UniscribeParagraphLayout.
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*/
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class UniscribeParagraphLayoutFactory {
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public:
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/** Helper for GetLayouter, to get the right type. */
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typedef wchar_t CharType;
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/** Helper for GetLayouter, to get whether the layouter supports RTL. */
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static const bool SUPPORTS_RTL = true;
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/**
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* Get the actual ParagraphLayout for the given buffer.
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* @param buff The begin of the buffer.
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* @param buff_end The location after the last element in the buffer.
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* @param fontMapping THe mapping of the fonts.
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* @return The ParagraphLayout instance.
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*/
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static ParagraphLayouter *GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping);
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/**
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* Append a wide character to the internal buffer.
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* @param buff The buffer to append to.
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* @param buffer_last The end of the buffer.
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* @param c The character to add.
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* @return The number of buffer spaces that were used.
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*/
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static size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, char32_t c)
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{
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assert(buff < buffer_last);
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if (c >= 0x010000U) {
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/* Character is encoded using surrogates in UTF-16. */
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if (buff + 1 <= buffer_last) {
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buff[0] = (CharType)(((c - 0x010000U) >> 10) + 0xD800);
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buff[1] = (CharType)(((c - 0x010000U) & 0x3FF) + 0xDC00);
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} else {
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/* Not enough space in buffer. */
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*buff = 0;
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}
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return 2;
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} else {
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*buff = (CharType)(c & 0xFFFF);
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return 1;
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}
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}
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};
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/** String iterator using Uniscribe as a backend. */
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class UniscribeStringIterator : public StringIterator {
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/** */
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struct CharInfo {
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bool word_stop : 1; ///< Code point is suitable as a word break.
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bool char_stop : 1; ///< Code point is the start of a grapheme cluster, i.e. a "character".
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};
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std::vector<CharInfo> str_info; ///< Break information for each code point.
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std::vector<size_t> utf16_to_utf8; ///< Mapping from UTF-16 code point position to index in the UTF-8 source string.
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size_t cur_pos; ///< Current iteration position.
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public:
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void SetString(const char *s) override;
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size_t SetCurPosition(size_t pos) override;
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size_t Next(IterType what) override;
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size_t Prev(IterType what) override;
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};
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#endif /* STRING_UNISCRIBE_H */
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