Attachment List Table

The Attachment List table (AttachList) may be used to cache attachment point coordinates along with glyph bitmaps.

The table consists of an offset to a Coverage table (Coverage) listing all glyphs that define attachment points in the GPOS table, a count of the glyphs with attachment points (GlyphCount), and an array of offsets to AttachPoint tables (AttachPoint). The array lists the AttachPoint tables, one for each glyph in the Coverage table, in the same order as the Coverage Index.

AttachList table

Type	Name	Description
Offset	Coverage	Offset to Coverage table
		—from beginning of AttachList table
uint16	GlyphCount	Number of glyphs with attachment points
Offset	AttachPoint	Array of offsets to AttachPoint tables
	[GlyphCount]	—from beginning of AttachList table
		—in Coverage Index order

An AttachPoint table consists of a count of the attachment points on a single glyph (PointCount) and an array of contour indices of those points (PointIndex), listed in increasing numerical order.

Example 3 at the end of the chapter demonstrates an AttachList table that defines attachment points for two glyphs.

AttachPoint table

Type	Name	Description
uint16	PointCount	Number of attachment points on this glyph
uint16	PointIndex	Array of contour point indices
	[PointCount]	—in increasing numerical order