GlyphCache

Glyph image cache

struct GlyphCache {

}

Destructor

~this ~this(): on destroy, destroy all items (when built with USE_OPENGL version, notify OpenGL cache about removed glyphs)

checkpoint void checkpoint(): clear usage flags for all entries
cleanup void cleanup(): removes entries not used after last call of checkpoint() or cleanup()
clear void clear(): removes all entries (when built with USE_OPENGL version, notify OpenGL cache about removed glyphs)
find glyph_ptr find(dchar ch): try to find glyph for character in cache, returns null if not found
put glyph_ptr put(dchar ch, glyph_ptr glyph): put character glyph to cache

Recently used glyphs are marked with glyph.lastUsage = 1

checkpoint() call clears usage marks

cleanup() removes all items not accessed since last checkpoint()