Codechange: [Win32] Move Win32-specific font code to a seperate file.

src/os/windows/font_win32.h

@@ -0,0 +1,42 @@
+/*
+ * 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_win32.h Functions related to font handling on Win32. */
+
+#ifndef FONT_WIN32_H
+#define FONT_WIN32_H
+
+#include "../../fontcache_internal.h"
+#include "win32.h"
+
+/** Font cache for fonts that are based on a Win32 font. */
+class Win32FontCache : public TrueTypeFontCache {
+private:
+	LOGFONT logfont;      ///< Logical font information for selecting the font face.
+	HFONT font = nullptr; ///< The font face associated with this font.
+	HDC dc = nullptr;     ///< Cached GDI device context.
+	HGDIOBJ old_font;     ///< Old font selected into the GDI context.
+	SIZE glyph_size;      ///< Maximum size of regular glyphs.
+
+	void SetFontSize(FontSize fs, int pixels);
+
+protected:
+	const void *InternalGetFontTable(uint32 tag, size_t &length) override;
+	const Sprite *InternalGetGlyph(GlyphID key, bool aa) override;
+
+public:
+	Win32FontCache(FontSize fs, const LOGFONT &logfont, int pixels);
+	~Win32FontCache();
+	void ClearFontCache() override;
+	GlyphID MapCharToGlyph(WChar key) override;
+	const char *GetFontName() override { return WIDE_TO_MB(this->logfont.lfFaceName); }
+	const void *GetOSHandle() override { return &this->logfont; }
+};
+
+void LoadWin32Font(FontSize fs);
+
+#endif /* FONT_WIN32_H */