0: width of glyph black box
2: height of glyph black box
< 10: glyph data, arbitrary size (blackBoxX * blackBoxY)
0: unique id of glyph (for drawing in hardware accelerated scenes)
9: usage flag, to handle cleanup of unused glyphs
3: X origin for glyph
4: Y origin for glyph
8: subpixel rendering mode - if !=SubpixelRenderingMode.None, glyph data contains 3 bytes per pixel instead of 1
5: full width of glyph
6: full width of glyph scaled * 64
Character glyph.
Holder for glyph metrics as well as image.