DefineFontAlignZones
tag in a SWF file. The DefineFont3 tag can be modified by a DefineFontAlignZones tag. The advanced text rendering engine uses alignment zones to establish the borders of a glyph for pixel snapping. Alignment zones are critical for high-quality display of fonts.
The alignment zone defines a bounding box for strong vertical and horizontal components of a glyph. The box is described by a left coordinate, thickness, baseline coordinate, and height. Small thicknesses or heights are often set to 0.
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