mirror of https://github.com/OpenTTD/OpenTTD.git
76 lines
3.2 KiB
C++
76 lines
3.2 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file truetypefontcache.h Common base definition for font file based font caches. */
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#ifndef TRUETYPEFONTCACHE_H
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#define TRUETYPEFONTCACHE_H
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#include "../fontcache.h"
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static const int MAX_FONT_SIZE = 72; ///< Maximum font size.
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static const uint8_t FACE_COLOUR = 1;
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static const uint8_t SHADOW_COLOUR = 2;
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/** Font cache for fonts that are based on a TrueType font. */
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class TrueTypeFontCache : public FontCache {
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protected:
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static constexpr int MAX_GLYPH_DIM = 256; ///< Maximum glyph dimensions.
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static constexpr uint MAX_FONT_MIN_REC_SIZE = 20u; ///< Upper limit for the recommended font size in case a font file contains nonsensical values.
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int req_size; ///< Requested font size.
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int used_size; ///< Used font size.
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using FontTable = std::map<uint32_t, std::pair<size_t, const void *>>; ///< Table with font table cache
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FontTable font_tables; ///< Cached font tables.
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/** Container for information about a glyph. */
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struct GlyphEntry {
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Sprite *sprite; ///< The loaded sprite.
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uint8_t width; ///< The width of the glyph.
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bool duplicate; ///< Whether this glyph entry is a duplicate, i.e. may this be freed?
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};
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/**
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* The glyph cache. This is structured to reduce memory consumption.
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* 1) There is a 'segment' table for each font size.
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* 2) Each segment table is a discrete block of characters.
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* 3) Each block contains 256 (aligned) characters sequential characters.
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*
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* The cache is accessed in the following way:
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* For character 0x0041 ('A'): glyph_to_sprite[0x00][0x41]
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* For character 0x20AC (Euro): glyph_to_sprite[0x20][0xAC]
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*
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* Currently only 256 segments are allocated, "limiting" us to 65536 characters.
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* This can be simply changed in the two functions Get & SetGlyphPtr.
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*/
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GlyphEntry **glyph_to_sprite;
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GlyphEntry *GetGlyphPtr(GlyphID key);
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void SetGlyphPtr(GlyphID key, const GlyphEntry *glyph, bool duplicate = false);
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virtual const void *InternalGetFontTable(uint32_t tag, size_t &length) = 0;
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virtual const Sprite *InternalGetGlyph(GlyphID key, bool aa) = 0;
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public:
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TrueTypeFontCache(FontSize fs, int pixels);
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virtual ~TrueTypeFontCache();
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int GetFontSize() const override { return this->used_size; }
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void SetUnicodeGlyph(char32_t key, SpriteID sprite) override { this->parent->SetUnicodeGlyph(key, sprite); }
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void InitializeUnicodeGlyphMap() override { this->parent->InitializeUnicodeGlyphMap(); }
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const Sprite *GetGlyph(GlyphID key) override;
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const void *GetFontTable(uint32_t tag, size_t &length) override;
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void ClearFontCache() override;
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uint GetGlyphWidth(GlyphID key) override;
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bool GetDrawGlyphShadow() override;
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bool IsBuiltInFont() override { return false; }
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};
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#endif /* TRUETYPEFONTCACHE_H */
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