Add: [OSX] Native font rendering without using FreeType.

src/os/macosx/font_osx.h

@@ -0,0 +1,40 @@
+/*
+ * 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_osx.h Functions related to font handling on MacOS. */
+
+#ifndef FONT_OSX_H
+#define FONT_OSX_H
+
+#include "../../fontcache_internal.h"
+#include "os/macosx/macos.h"
+
+#include <CoreFoundation/CoreFoundation.h>
+
+class CoreTextFontCache : public TrueTypeFontCache {
+	CFAutoRelease<CTFontDescriptorRef> font_desc; ///< Font descriptor exlcuding font size.
+	CFAutoRelease<CTFontRef> font;                ///< CoreText font handle.
+
+	std::string font_name;                        ///< Cached font name.
+
+	void SetFontSize(int pixels);
+	const Sprite *InternalGetGlyph(GlyphID key, bool use_aa) override;
+	const void *InternalGetFontTable(uint32 tag, size_t &length) override;
+public:
+	CoreTextFontCache(FontSize fs, CFAutoRelease<CTFontDescriptorRef> &&font, int pixels);
+	~CoreTextFontCache() {}
+
+	void ClearFontCache() override;
+	GlyphID MapCharToGlyph(WChar key) override;
+	const char *GetFontName() override { return font_name.c_str(); }
+	bool IsBuiltInFont() override { return false; }
+	const void *GetOSHandle() override { return font.get(); }
+};
+
+void LoadCoreTextFont(FontSize fs);
+
+#endif /* FONT_OSX_H */