Font cache for fonts that are based on a freetype font. More...
Data Structures | |
| struct | GlyphEntry |
| Container for information about a glyph. More... | |
Public Member Functions | |
| FreeTypeFontCache (FontSize fs, FT_Face face, int pixels) | |
| Create a new FreeTypeFontCache. | |
| ~FreeTypeFontCache () | |
| Free everything that was allocated for this font cache. | |
| virtual SpriteID | GetUnicodeGlyph (WChar key) |
| Get the SpriteID mapped to the given key. | |
| virtual void | SetUnicodeGlyph (WChar key, SpriteID sprite) |
| Map a SpriteID to the key. | |
| virtual void | InitializeUnicodeGlyphMap () |
| Initialize the glyph map. | |
| virtual void | ClearFontCache () |
| Reset cached glyphs. | |
| virtual const Sprite * | GetGlyph (GlyphID key) |
| Get the glyph (sprite) of the given key. | |
| virtual uint | GetGlyphWidth (GlyphID key) |
| Get the width of the glyph with the given key. | |
| virtual bool | GetDrawGlyphShadow () |
| Do we need to draw a glyph shadow? | |
| virtual GlyphID | MapCharToGlyph (WChar key) |
| Map a character into a glyph. | |
| virtual const void * | GetFontTable (uint32 tag, size_t &length) |
| Read a font table from the font. | |
Private Types | |
|
typedef SmallMap< uint32, SmallPair< size_t, const void * > > | FontTable |
| Table with font table cache. | |
Private Member Functions | |
| GlyphEntry * | GetGlyphPtr (GlyphID key) |
| void | SetGlyphPtr (GlyphID key, const GlyphEntry *glyph, bool duplicate=false) |
Private Attributes | |
| FT_Face | face |
| The font face associated with this font. | |
| FontTable | font_tables |
| Cached font tables. | |
| GlyphEntry ** | glyph_to_sprite |
| The glyph cache. | |
Font cache for fonts that are based on a freetype font.
Definition at line 198 of file fontcache.cpp.
| FreeTypeFontCache::FreeTypeFontCache | ( | FontSize | fs, | |
| FT_Face | face, | |||
| int | pixels | |||
| ) |
Create a new FreeTypeFontCache.
| fs | The font size that is going to be cached. | |
| face | The font that has to be loaded. | |
| pixels | The number of pixels this font should be high. |
Definition at line 257 of file fontcache.cpp.
References _default_font_height, abs(), FontCache::ascender, Clamp(), FontCache::descender, FontCache::height, MAX_FONT_SIZE, min(), and FontCache::units_per_em.
| bool FreeTypeFontCache::GetDrawGlyphShadow | ( | ) | [virtual] |
Do we need to draw a glyph shadow?
Implements FontCache.
Definition at line 561 of file fontcache.cpp.
References FontCache::fs, and FS_NORMAL.
| const void * FreeTypeFontCache::GetFontTable | ( | uint32 | tag, | |
| size_t & | length | |||
| ) | [virtual] |
Read a font table from the font.
| tag | The of the table to load. | |
| length | The length of the read data. |
Implements FontCache.
Definition at line 591 of file fontcache.cpp.
References SmallVector< T, S >::End(), face, SmallMap< T, U, S >::Find(), font_tables, and SmallMap< T, U, S >::Insert().
Get the glyph (sprite) of the given key.
| key | The key to look up. |
Implements FontCache.
Definition at line 452 of file fontcache.cpp.
References SpriteLoader::CommonPixel::a, SpriteLoader::Sprite::AllocateData(), FontCache::ascender, SpriteLoader::Sprite::data, Blitter::Encode(), face, FontCache::fs, FS_NORMAL, BlitterFactoryBase::GetCurrentBlitter(), FontCache::GetGlyph(), HasBit(), SpriteLoader::Sprite::height, FontCache::height, SpriteLoader::CommonPixel::m, MapCharToGlyph(), max(), FontCache::parent, FreeTypeFontCache::GlyphEntry::sprite, SpriteLoader::Sprite::type, usererror(), SpriteLoader::Sprite::width, Sprite::width, FreeTypeFontCache::GlyphEntry::width, SpriteLoader::Sprite::x_offs, SpriteLoader::Sprite::y_offs, and ZOOM_LVL_NORMAL.
Referenced by GetGlyphWidth().
| uint FreeTypeFontCache::GetGlyphWidth | ( | GlyphID | key | ) | [virtual] |
Get the width of the glyph with the given key.
| key | The key to look up. |
Implements FontCache.
Definition at line 567 of file fontcache.cpp.
References GetGlyph(), FontCache::GetGlyphWidth(), FontCache::parent, FreeTypeFontCache::GlyphEntry::sprite, and FreeTypeFontCache::GlyphEntry::width.
Get the SpriteID mapped to the given key.
| key | The key to get the sprite for. |
Implements FontCache.
Definition at line 233 of file fontcache.cpp.
References FontCache::GetUnicodeGlyph(), and FontCache::parent.
Map a character into a glyph.
| key | The character. |
Implements FontCache.
Definition at line 580 of file fontcache.cpp.
References face, FontCache::MapCharToGlyph(), and FontCache::parent.
Referenced by GetGlyph().
Map a SpriteID to the key.
| key | The key to map to. | |
| sprite | The sprite that is being mapped. |
Implements FontCache.
Definition at line 234 of file fontcache.cpp.
References FontCache::parent, and FontCache::SetUnicodeGlyph().
GlyphEntry** FreeTypeFontCache::glyph_to_sprite [private] |
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.
Definition at line 225 of file fontcache.cpp.
Referenced by ClearFontCache().
1.7.1