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Location: cpp/openttd-patchpack/source/src/os/unix/font_unix.cpp
r27657:0b6cf1e99420
5.9 KiB
text/x-c
Codechange: Pass face index as font os_handle for FreeType fonts. (#11073)
This allows fallback font detection to test the specific face within the
font rather instead of only the first.
This allows fallback font detection to test the specific face within the
font rather instead of only the first.
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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 font_unix.cpp Functions related to font handling on Unix/Fontconfig. */
#include "../../stdafx.h"
#include "../../debug.h"
#include "../../fontdetection.h"
#include "../../string_func.h"
#include "../../strings_func.h"
#include <fontconfig/fontconfig.h>
#include "safeguards.h"
#include <ft2build.h>
#include FT_FREETYPE_H
extern FT_Library _library;
/**
* Split the font name into the font family and style. These fields are separated by a comma,
* but the style does not necessarily need to exist.
* @param font_name The font name.
* @return The font family and style.
*/
static std::tuple<std::string, std::string> SplitFontFamilyAndStyle(std::string_view font_name)
{
auto separator = font_name.find(',');
if (separator == std::string_view::npos) return { std::string(font_name), std::string() };
auto begin = font_name.find_first_not_of("\t ", separator + 1);
return { std::string(font_name.substr(0, separator)), std::string(font_name.substr(begin)) };
}
FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
{
FT_Error err = FT_Err_Cannot_Open_Resource;
if (!FcInit()) {
ShowInfo("Unable to load font configuration");
return err;
}
auto fc_instance = FcConfigReference(nullptr);
assert(fc_instance != nullptr);
/* Split & strip the font's style */
auto [font_family, font_style] = SplitFontFamilyAndStyle(font_name);
/* Resolve the name and populate the information structure */
FcPattern *pat = FcNameParse((FcChar8 *)font_family.data());
if (!font_style.empty()) FcPatternAddString(pat, FC_STYLE, (FcChar8 *)font_style.data());
FcConfigSubstitute(nullptr, pat, FcMatchPattern);
FcDefaultSubstitute(pat);
FcFontSet *fs = FcFontSetCreate();
FcResult result;
FcPattern *match = FcFontMatch(nullptr, pat, &result);
if (fs != nullptr && match != nullptr) {
FcChar8 *family;
FcChar8 *style;
FcChar8 *file;
int32_t index;
FcFontSetAdd(fs, match);
for (int i = 0; err != FT_Err_Ok && i < fs->nfont; i++) {
/* Try the new filename */
if (FcPatternGetString(fs->fonts[i], FC_FILE, 0, &file) == FcResultMatch &&
FcPatternGetString(fs->fonts[i], FC_FAMILY, 0, &family) == FcResultMatch &&
FcPatternGetString(fs->fonts[i], FC_STYLE, 0, &style) == FcResultMatch &&
FcPatternGetInteger(fs->fonts[i], FC_INDEX, 0, &index) == FcResultMatch) {
/* The correct style? */
if (!font_style.empty() && !StrEqualsIgnoreCase(font_style, (char *)style)) continue;
/* Font config takes the best shot, which, if the family name is spelled
* wrongly a 'random' font, so check whether the family name is the
* same as the supplied name */
if (StrEqualsIgnoreCase(font_family, (char *)family)) {
err = FT_New_Face(_library, (char *)file, index, face);
}
}
}
}
FcPatternDestroy(pat);
FcFontSetDestroy(fs);
FcConfigDestroy(fc_instance);
return err;
}
bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int winlangid, MissingGlyphSearcher *callback)
{
bool ret = false;
if (!FcInit()) return ret;
auto fc_instance = FcConfigReference(nullptr);
assert(fc_instance != nullptr);
/* Fontconfig doesn't handle full language isocodes, only the part
* before the _ of e.g. en_GB is used, so "remove" everything after
* the _. */
std::string lang = fmt::format(":lang={}", language_isocode.substr(0, language_isocode.find('_')));
/* First create a pattern to match the wanted language. */
FcPattern *pat = FcNameParse((const FcChar8 *)lang.c_str());
/* We only want to know these attributes. */
FcObjectSet *os = FcObjectSetBuild(FC_FILE, FC_INDEX, FC_SPACING, FC_SLANT, FC_WEIGHT, nullptr);
/* Get the list of filenames matching the wanted language. */
FcFontSet *fs = FcFontList(nullptr, pat, os);
/* We don't need these anymore. */
FcObjectSetDestroy(os);
FcPatternDestroy(pat);
if (fs != nullptr) {
int best_weight = -1;
const char *best_font = nullptr;
int best_index = 0;
for (int i = 0; i < fs->nfont; i++) {
FcPattern *font = fs->fonts[i];
FcChar8 *file = nullptr;
FcResult res = FcPatternGetString(font, FC_FILE, 0, &file);
if (res != FcResultMatch || file == nullptr) {
continue;
}
/* Get a font with the right spacing .*/
int value = 0;
FcPatternGetInteger(font, FC_SPACING, 0, &value);
if (callback->Monospace() != (value == FC_MONO) && value != FC_DUAL) continue;
/* Do not use those that explicitly say they're slanted. */
FcPatternGetInteger(font, FC_SLANT, 0, &value);
if (value != 0) continue;
/* We want the fatter font as they look better at small sizes. */
FcPatternGetInteger(font, FC_WEIGHT, 0, &value);
if (value <= best_weight) continue;
/* Possible match based on attributes, get index. */
int32_t index;
res = FcPatternGetInteger(font, FC_INDEX, 0, &index);
if (res != FcResultMatch) continue;
callback->SetFontNames(settings, (const char *)file, &index);
bool missing = callback->FindMissingGlyphs();
Debug(fontcache, 1, "Font \"{}\" misses{} glyphs", (char *)file, missing ? "" : " no");
if (!missing) {
best_weight = value;
best_font = (const char *)file;
best_index = index;
}
}
if (best_font != nullptr) {
ret = true;
callback->SetFontNames(settings, best_font, &best_index);
InitFontCache(callback->Monospace());
}
/* Clean up the list of filenames. */
FcFontSetDestroy(fs);
}
FcConfigDestroy(fc_instance);
return ret;
}
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