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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 fontcache_internal.h Support types and functions for platform-specific font support. */
#ifndef FONTCACHE_INTERNAL_H
#define FONTCACHE_INTERNAL_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 /* FONTCACHE_INTERNAL_H */
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