Variables for all glyphs:

numberOfContours

For simple glyphs this will be the count of contours. For compound glyphs this will be -1.

xMin

yMin

xMax

yMax

These identify the bounding box of the glyph.

There are also other, derived, instance variables for each glyph which are read when the whole glyph is read (via "read_dat"):

instLen

Number of bytes in the hinting instructions (Warning this variable is deprecated, use "length($g-"{'hints'})> instead).

hints

The string containing the hinting code for the glyph

Variables for simple glyphs (numberOfContours >= 0):

endPoints

An array of endpoints for each contour in the glyph. There are "numberOfContours" contours in a glyph. The number of points in a glyph is equal to the highest endpoint of a contour.

numPoints

This is a generated value which contains the total number of points for this simple glyph.

There are also a number of arrays indexed by point number:

flags

The flags associated with reading this point. The flags for a point are recalculated for a point when it is "update"d. Thus the flags are not very useful. The only important bit is bit 0 which indicates whether the point is an 'on' curve point, or an 'off' curve point.

x

The absolute x co-ordinate of the point.

y

The absolute y co-ordinate of the point

Variables for compound glyphs (numberOfContours == -1):

metric

This holds the component number (not its glyph number) of the component from which the metrics for this glyph should be taken.

comps

This is an array of hashes for each component. Each hash has a number of elements:

numPoints

This is a generated value which contains the number of components read in for this compound glyph.

Private instance variables:

INFILE (P)

The input file form which to read any information

LOC (P)

Location relative to the start of the glyf table in the read file

BASE (P)

The location of the glyf table in the read file

LEN (P)

This is the number of bytes required by the glyph. It should be kept up to date by calling the "update" method whenever any of the glyph content changes.

OUTLOC (P)

Location relative to the start of the glyf table. This variable is only active whilst the output process is going on. It is used to inform the location table where the glyph is located, since the glyf table is output before the loca table due to alphabetical ordering.

OUTLEN (P)

This indicates the length of the glyph data when it is output. This more accurately reflects the internal memory form than the "LEN" variable which only reflects the read file length. The "OUTLEN" variable is only set after calling "out" or "out_dat".

Editing

    numPoints
    numberOfContours
    endPoints
    x, y, flags         (only flags bit 0)
    instLen
    hints

For components, the numPoints, x, y, endPoints & flags are not required but the following information is required for each component.

    flag                (bits 2, 10, 11, 12)
    glyph
    args
    scale
    metric              (glyph instance variable)

$g->read

$g->read_dat

$g->out($fh)

$g->out_xml($context, $depth)

$g->dirty($val)

$g->update

$g->update_bbox

$g->maxInfo

$g->empty

$g->get_points

$g->get_refs

Please note the warning about bad fonts that reference nonexistent glyphs under INSTANCE VARIABLES above. This function will not attempt to filter out nonexistent glyph numbers.