diff --git a/src/fontcache/truetypefontcache.h b/src/fontcache/truetypefontcache.h
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--- /dev/null
+++ b/src/fontcache/truetypefontcache.h
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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 truetypefontcache.h Common base definition for font file based font caches. */
+
+#ifndef TRUETYPEFONTCACHE_H
+#define TRUETYPEFONTCACHE_H
+
+#include "../core/smallmap_type.hpp"
+#include "../fontcache.h"
+
+
+static const int MAX_FONT_SIZE = 72; ///< Maximum font size.
+
+static const byte FACE_COLOUR = 1;
+static const byte SHADOW_COLOUR = 2;
+
+/** Font cache for fonts that are based on a TrueType font. */
+class TrueTypeFontCache : public FontCache {
+protected:
+	static constexpr int MAX_GLYPH_DIM = 256;          ///< Maximum glyph dimensions.
+	static constexpr uint MAX_FONT_MIN_REC_SIZE = 20u; ///< Upper limit for the recommended font size in case a font file contains nonsensical values.
+
+	int req_size;  ///< Requested font size.
+	int used_size; ///< Used font size.
+
+	typedef SmallMap<uint32, std::pair<size_t, const void *> > FontTable; ///< Table with font table cache
+	FontTable font_tables; ///< Cached font tables.
+
+	/** Container for information about a glyph. */
+	struct GlyphEntry {
+		Sprite *sprite; ///< The loaded sprite.
+		byte width;     ///< The width of the glyph.
+		bool duplicate; ///< Whether this glyph entry is a duplicate, i.e. may this be freed?
+	};
+
+	/**
+	 * The glyph cache. This is structured to reduce memory consumption.
+	 * 1) There is a 'segment' table for each font size.
+	 * 2) Each segment table is a discrete block of characters.
+	 * 3) Each block contains 256 (aligned) characters sequential characters.
+	 *
+	 * The cache is accessed in the following way:
+	 * For character 0x0041  ('A'): glyph_to_sprite[0x00][0x41]
+	 * For character 0x20AC (Euro): glyph_to_sprite[0x20][0xAC]
+	 *
+	 * Currently only 256 segments are allocated, "limiting" us to 65536 characters.
+	 * This can be simply changed in the two functions Get & SetGlyphPtr.
+	 */
+	GlyphEntry **glyph_to_sprite;
+
+	GlyphEntry *GetGlyphPtr(GlyphID key);
+	void SetGlyphPtr(GlyphID key, const GlyphEntry *glyph, bool duplicate = false);
+
+	virtual const void *InternalGetFontTable(uint32 tag, size_t &length) = 0;
+	virtual const Sprite *InternalGetGlyph(GlyphID key, bool aa) = 0;
+
+public:
+	TrueTypeFontCache(FontSize fs, int pixels);
+	virtual ~TrueTypeFontCache();
+	int GetFontSize() const override { return this->used_size; }
+	SpriteID GetUnicodeGlyph(WChar key) override { return this->parent->GetUnicodeGlyph(key); }
+	void SetUnicodeGlyph(WChar key, SpriteID sprite) override { this->parent->SetUnicodeGlyph(key, sprite); }
+	void InitializeUnicodeGlyphMap() override { this->parent->InitializeUnicodeGlyphMap(); }
+	const Sprite *GetGlyph(GlyphID key) override;
+	const void *GetFontTable(uint32 tag, size_t &length) override;
+	void ClearFontCache() override;
+	uint GetGlyphWidth(GlyphID key) override;
+	bool GetDrawGlyphShadow() override;
+	bool IsBuiltInFont() override { return false; }
+};
+
+#endif /* TRUETYPEFONTCACHE_H */