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/*
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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 font_unix.cpp Functions related to font handling on Unix/Fontconfig. */
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#include "../../stdafx.h"
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#include "../../debug.h"
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#include "../../fontdetection.h"
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#include "../../string_func.h"
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#include "../../strings_func.h"
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#include <fontconfig/fontconfig.h>
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#include "safeguards.h"
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#include <ft2build.h>
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#include FT_FREETYPE_H
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extern FT_Library _library;
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/**
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* Split the font name into the font family and style. These fields are separated by a comma,
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* but the style does not necessarily need to exist.
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* @param font_name The font name.
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* @return The font family and style.
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*/
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static std::tuple<std::string, std::string> SplitFontFamilyAndStyle(std::string_view font_name)
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{
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auto separator = font_name.find(',');
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if (separator == std::string_view::npos) return { std::string(font_name), std::string() };
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auto begin = font_name.find_first_not_of("\t ", separator + 1);
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return { std::string(font_name.substr(0, separator)), std::string(font_name.substr(begin)) };
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}
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FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
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{
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FT_Error err = FT_Err_Cannot_Open_Resource;
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if (!FcInit()) {
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ShowInfo("Unable to load font configuration");
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return err;
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}
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auto fc_instance = FcConfigReference(nullptr);
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assert(fc_instance != nullptr);
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/* Split & strip the font's style */
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auto [font_family, font_style] = SplitFontFamilyAndStyle(font_name);
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/* Resolve the name and populate the information structure */
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FcPattern *pat = FcNameParse((FcChar8 *)font_family.data());
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if (!font_style.empty()) FcPatternAddString(pat, FC_STYLE, (FcChar8 *)font_style.data());
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FcConfigSubstitute(nullptr, pat, FcMatchPattern);
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FcDefaultSubstitute(pat);
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FcFontSet *fs = FcFontSetCreate();
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FcResult result;
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FcPattern *match = FcFontMatch(nullptr, pat, &result);
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if (fs != nullptr && match != nullptr) {
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FcChar8 *family;
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FcChar8 *style;
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FcChar8 *file;
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int32_t index;
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FcFontSetAdd(fs, match);
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for (int i = 0; err != FT_Err_Ok && i < fs->nfont; i++) {
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/* Try the new filename */
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if (FcPatternGetString(fs->fonts[i], FC_FILE, 0, &file) == FcResultMatch &&
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FcPatternGetString(fs->fonts[i], FC_FAMILY, 0, &family) == FcResultMatch &&
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FcPatternGetString(fs->fonts[i], FC_STYLE, 0, &style) == FcResultMatch &&
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FcPatternGetInteger(fs->fonts[i], FC_INDEX, 0, &index) == FcResultMatch) {
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/* The correct style? */
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if (!font_style.empty() && !StrEqualsIgnoreCase(font_style, (char *)style)) continue;
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/* Font config takes the best shot, which, if the family name is spelled
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* wrongly a 'random' font, so check whether the family name is the
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* same as the supplied name */
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if (StrEqualsIgnoreCase(font_family, (char *)family)) {
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err = FT_New_Face(_library, (char *)file, index, face);
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}
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}
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}
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}
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FcPatternDestroy(pat);
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FcFontSetDestroy(fs);
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FcConfigDestroy(fc_instance);
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return err;
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}
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bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int, MissingGlyphSearcher *callback)
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{
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bool ret = false;
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if (!FcInit()) return ret;
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auto fc_instance = FcConfigReference(nullptr);
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assert(fc_instance != nullptr);
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/* Fontconfig doesn't handle full language isocodes, only the part
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* before the _ of e.g. en_GB is used, so "remove" everything after
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* the _. */
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std::string lang = fmt::format(":lang={}", language_isocode.substr(0, language_isocode.find('_')));
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/* First create a pattern to match the wanted language. */
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FcPattern *pat = FcNameParse((const FcChar8 *)lang.c_str());
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/* We only want to know these attributes. */
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FcObjectSet *os = FcObjectSetBuild(FC_FILE, FC_INDEX, FC_SPACING, FC_SLANT, FC_WEIGHT, nullptr);
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/* Get the list of filenames matching the wanted language. */
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FcFontSet *fs = FcFontList(nullptr, pat, os);
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/* We don't need these anymore. */
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FcObjectSetDestroy(os);
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FcPatternDestroy(pat);
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if (fs != nullptr) {
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int best_weight = -1;
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const char *best_font = nullptr;
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int best_index = 0;
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for (int i = 0; i < fs->nfont; i++) {
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FcPattern *font = fs->fonts[i];
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FcChar8 *file = nullptr;
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FcResult res = FcPatternGetString(font, FC_FILE, 0, &file);
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if (res != FcResultMatch || file == nullptr) {
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continue;
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}
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/* Get a font with the right spacing .*/
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int value = 0;
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FcPatternGetInteger(font, FC_SPACING, 0, &value);
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if (callback->Monospace() != (value == FC_MONO) && value != FC_DUAL) continue;
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/* Do not use those that explicitly say they're slanted. */
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FcPatternGetInteger(font, FC_SLANT, 0, &value);
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if (value != 0) continue;
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/* We want the fatter font as they look better at small sizes. */
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FcPatternGetInteger(font, FC_WEIGHT, 0, &value);
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if (value <= best_weight) continue;
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/* Possible match based on attributes, get index. */
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int32_t index;
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res = FcPatternGetInteger(font, FC_INDEX, 0, &index);
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if (res != FcResultMatch) continue;
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callback->SetFontNames(settings, (const char *)file, &index);
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bool missing = callback->FindMissingGlyphs();
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Debug(fontcache, 1, "Font \"{}\" misses{} glyphs", (char *)file, missing ? "" : " no");
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if (!missing) {
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best_weight = value;
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best_font = (const char *)file;
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best_index = index;
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}
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}
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if (best_font != nullptr) {
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ret = true;
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callback->SetFontNames(settings, best_font, &best_index);
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InitFontCache(callback->Monospace());
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}
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/* Clean up the list of filenames. */
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FcFontSetDestroy(fs);
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}
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FcConfigDestroy(fc_instance);
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return ret;
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}
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