2D Vector Graphics Engine
BLFontDesignMetrics based on font size and other properties.
Font ascent (horizontal orientation).
Font ascent (vertical orientation).
Font descent (horizontal orientation).
Font descent (vertical orientation).
Distance between the baseline and the mean line of lower-case letters.
Maximum height of a capital letter above the baseline.
Minimum x, reported by the font.
Minimum y, reported by the font.
Maximum x, reported by the font.
Maximum y, reported by the font.
Text underline position.
Text underline thickness.
Text strikethrough position.
Text strikethrough thickness.