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369 lines
10 KiB
C++
369 lines
10 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 gfx_layout.cpp Handling of laying out text. */
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#include "stdafx.h"
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#include "core/math_func.hpp"
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#include "gfx_layout.h"
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#include "string_func.h"
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#include "debug.h"
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#include "table/control_codes.h"
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#include "gfx_layout_fallback.h"
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#if defined(WITH_ICU_I18N) && defined(WITH_HARFBUZZ)
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#include "gfx_layout_icu.h"
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#endif /* WITH_ICU_I18N && WITH_HARFBUZZ */
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#ifdef WITH_UNISCRIBE
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#include "os/windows/string_uniscribe.h"
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#endif /* WITH_UNISCRIBE */
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#ifdef WITH_COCOA
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#include "os/macosx/string_osx.h"
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#endif
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#include "safeguards.h"
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/** Cache of ParagraphLayout lines. */
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Layouter::LineCache *Layouter::linecache;
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/** Cache of Font instances. */
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Layouter::FontColourMap Layouter::fonts[FS_END];
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/**
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* Construct a new font.
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* @param size The font size to use for this font.
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* @param colour The colour to draw this font in.
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*/
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Font::Font(FontSize size, TextColour colour) :
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fc(FontCache::Get(size)), colour(colour)
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{
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assert(size < FS_END);
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}
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/**
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* Helper for getting a ParagraphLayouter of the given type.
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*
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* @note In case no ParagraphLayouter could be constructed, line.layout will be nullptr.
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* @param line The cache item to store our layouter in.
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* @param str The string to create a layouter for.
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* @param state The state of the font and color.
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* @tparam T The type of layouter we want.
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*/
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template <typename T>
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static inline void GetLayouter(Layouter::LineCacheItem &line, std::string_view str, FontState &state)
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{
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if (line.buffer != nullptr) free(line.buffer);
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typename T::CharType *buff_begin = MallocT<typename T::CharType>(str.size() + 1);
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const typename T::CharType *buffer_last = buff_begin + str.size() + 1;
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typename T::CharType *buff = buff_begin;
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FontMap &fontMapping = line.runs;
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Font *f = Layouter::GetFont(state.fontsize, state.cur_colour);
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line.buffer = buff_begin;
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fontMapping.clear();
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auto cur = str.begin();
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/*
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* Go through the whole string while adding Font instances to the font map
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* whenever the font changes, and convert the wide characters into a format
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* usable by ParagraphLayout.
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*/
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for (; buff < buffer_last && cur != str.end();) {
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WChar c = Utf8Consume(cur);
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if (c == '\0' || c == '\n') {
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/* Caller should already have filtered out these characters. */
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NOT_REACHED();
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} else if (c >= SCC_BLUE && c <= SCC_BLACK) {
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state.SetColour((TextColour)(c - SCC_BLUE));
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} else if (c == SCC_PUSH_COLOUR) {
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state.PushColour();
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} else if (c == SCC_POP_COLOUR) {
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state.PopColour();
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} else if (c >= SCC_FIRST_FONT && c <= SCC_LAST_FONT) {
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state.SetFontSize((FontSize)(c - SCC_FIRST_FONT));
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} else {
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/* Filter out non printable characters */
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if (!IsPrintable(c)) continue;
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/* Filter out text direction characters that shouldn't be drawn, and
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* will not be handled in the fallback case because they are mostly
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* needed for RTL languages which need more proper shaping support. */
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if (!T::SUPPORTS_RTL && IsTextDirectionChar(c)) continue;
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buff += T::AppendToBuffer(buff, buffer_last, c);
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continue;
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}
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if (fontMapping.count(buff - buff_begin) == 0) {
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fontMapping[buff - buff_begin] = f;
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}
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f = Layouter::GetFont(state.fontsize, state.cur_colour);
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}
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/* Better safe than sorry. */
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*buff = '\0';
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if (fontMapping.count(buff - buff_begin) == 0) {
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fontMapping[buff - buff_begin] = f;
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}
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line.layout = T::GetParagraphLayout(buff_begin, buff, fontMapping);
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line.state_after = state;
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}
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/**
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* Create a new layouter.
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* @param str The string to create the layout for.
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* @param maxw The maximum width.
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* @param colour The colour of the font.
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* @param fontsize The size of font to use.
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*/
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Layouter::Layouter(std::string_view str, int maxw, TextColour colour, FontSize fontsize) : string(str)
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{
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FontState state(colour, fontsize);
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while (true) {
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auto line_length = str.find_first_of('\n');
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auto str_line = str.substr(0, line_length);
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LineCacheItem &line = GetCachedParagraphLayout(str_line, state);
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if (line.layout != nullptr) {
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state = line.state_after;
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line.layout->Reflow();
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} else {
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/* Line is new, layout it */
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FontState old_state = state;
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#if defined(WITH_ICU_I18N) && defined(WITH_HARFBUZZ)
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if (line.layout == nullptr) {
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GetLayouter<ICUParagraphLayoutFactory>(line, str_line, state);
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if (line.layout == nullptr) {
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state = old_state;
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}
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}
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#endif
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#ifdef WITH_UNISCRIBE
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if (line.layout == nullptr) {
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GetLayouter<UniscribeParagraphLayoutFactory>(line, str_line, state);
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if (line.layout == nullptr) {
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state = old_state;
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}
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}
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#endif
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#ifdef WITH_COCOA
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if (line.layout == nullptr) {
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GetLayouter<CoreTextParagraphLayoutFactory>(line, str_line, state);
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if (line.layout == nullptr) {
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state = old_state;
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}
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}
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#endif
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if (line.layout == nullptr) {
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GetLayouter<FallbackParagraphLayoutFactory>(line, str_line, state);
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}
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}
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/* Move all lines into a local cache so we can reuse them later on more easily. */
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for (;;) {
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auto l = line.layout->NextLine(maxw);
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if (l == nullptr) break;
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this->push_back(std::move(l));
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}
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/* Break out if this was the last line. */
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if (line_length == std::string_view::npos) {
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break;
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}
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/* Go to the next line. */
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str.remove_prefix(line_length + 1);
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}
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}
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/**
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* Get the boundaries of this paragraph.
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* @return The boundaries.
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*/
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Dimension Layouter::GetBounds()
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{
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Dimension d = { 0, 0 };
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for (const auto &l : *this) {
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d.width = std::max<uint>(d.width, l->GetWidth());
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d.height += l->GetLeading();
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}
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return d;
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}
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/**
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* Get the position of a character in the layout.
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* @param ch Character to get the position of. Must be an iterator of the string passed to the constructor.
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* @return Upper left corner of the character relative to the start of the string.
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* @note Will only work right for single-line strings.
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*/
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Point Layouter::GetCharPosition(std::string_view::const_iterator ch) const
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{
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const auto &line = this->front();
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/* Pointer to the end-of-string marker? Return total line width. */
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if (ch == this->string.end()) {
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Point p = { line->GetWidth(), 0 };
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return p;
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}
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/* Find the code point index which corresponds to the char
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* pointer into our UTF-8 source string. */
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size_t index = 0;
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auto str = this->string.begin();
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while (str < ch) {
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WChar c = Utf8Consume(str);
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index += line->GetInternalCharLength(c);
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}
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/* We couldn't find the code point index. */
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if (str != ch) {
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return { 0, 0 };
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}
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/* Valid character. */
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/* Scan all runs until we've found our code point index. */
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for (int run_index = 0; run_index < line->CountRuns(); run_index++) {
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const ParagraphLayouter::VisualRun &run = line->GetVisualRun(run_index);
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for (int i = 0; i < run.GetGlyphCount(); i++) {
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/* Matching glyph? Return position. */
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if ((size_t)run.GetGlyphToCharMap()[i] == index) {
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Point p = { (int)run.GetPositions()[i * 2], (int)run.GetPositions()[i * 2 + 1] };
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return p;
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}
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}
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}
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NOT_REACHED();
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}
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/**
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* Get the character that is at a pixel position in the first line of the layouted text.
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* @param x Position in the string.
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* @return String offset of the position (bytes) or -1 if no character is at the position.
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*/
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ptrdiff_t Layouter::GetCharAtPosition(int x) const
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{
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const auto &line = this->front();
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for (int run_index = 0; run_index < line->CountRuns(); run_index++) {
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const ParagraphLayouter::VisualRun &run = line->GetVisualRun(run_index);
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for (int i = 0; i < run.GetGlyphCount(); i++) {
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/* Not a valid glyph (empty). */
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if (run.GetGlyphs()[i] == 0xFFFF) continue;
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int begin_x = (int)run.GetPositions()[i * 2];
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int end_x = (int)run.GetPositions()[i * 2 + 2];
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if (IsInsideMM(x, begin_x, end_x)) {
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/* Found our glyph, now convert to UTF-8 string index. */
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size_t index = run.GetGlyphToCharMap()[i];
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size_t cur_idx = 0;
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for (auto str = this->string.begin(); str != this->string.end();) {
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if (cur_idx == index) return str - this->string.begin();
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WChar c = Utf8Consume(str);
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cur_idx += line->GetInternalCharLength(c);
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}
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}
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}
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}
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return -1;
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}
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/**
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* Get a static font instance.
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*/
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Font *Layouter::GetFont(FontSize size, TextColour colour)
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{
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FontColourMap::iterator it = fonts[size].find(colour);
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if (it != fonts[size].end()) return it->second.get();
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fonts[size][colour] = std::make_unique<Font>(size, colour);
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return fonts[size][colour].get();
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}
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/**
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* Reset cached font information.
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* @param size Font size to reset.
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*/
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void Layouter::ResetFontCache(FontSize size)
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{
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fonts[size].clear();
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/* We must reset the linecache since it references the just freed fonts */
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ResetLineCache();
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#if defined(WITH_UNISCRIBE)
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UniscribeResetScriptCache(size);
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#endif
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#if defined(WITH_COCOA)
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MacOSResetScriptCache(size);
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#endif
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}
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/**
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* Get reference to cache item.
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* If the item does not exist yet, it is default constructed.
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* @param str Source string of the line (including colour and font size codes).
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* @param state State of the font at the beginning of the line.
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* @return Reference to cache item.
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*/
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Layouter::LineCacheItem &Layouter::GetCachedParagraphLayout(std::string_view str, const FontState &state)
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{
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if (linecache == nullptr) {
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/* Create linecache on first access to avoid trouble with initialisation order of static variables. */
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linecache = new LineCache();
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}
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if (auto match = linecache->find(LineCacheQuery{state, str});
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match != linecache->end()) {
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return match->second;
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}
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/* Create missing entry */
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LineCacheKey key;
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key.state_before = state;
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key.str.assign(str);
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return (*linecache)[key];
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}
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/**
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* Clear line cache.
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*/
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void Layouter::ResetLineCache()
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{
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if (linecache != nullptr) linecache->clear();
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}
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/**
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* Reduce the size of linecache if necessary to prevent infinite growth.
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*/
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void Layouter::ReduceLineCache()
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{
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if (linecache != nullptr) {
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/* TODO LRU cache would be fancy, but not exactly necessary */
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if (linecache->size() > 4096) ResetLineCache();
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}
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}
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