Apple LaserWriter Pro 630 Envelope Feeder Specifications download pdf (Page 94)

CHAPTER 4

TrueType Fonts

82 TrueType Font Dictionary Entries

WMode integer

Optional. Indicates which of two sets of metrics is used when

characters are shown from this font. If this entry (or the WMode

entry of the root font from which this font is a descendant) has

the value 1, then this font must have a CDevProc entry (see

Table 4-3). See Section 5.9 of the PostScript Language Reference

Manual, for information about composite fonts.

Default value: 0

XUID array

Optional. An array of integers that uniquely identiﬁes this font or

any variant of it for the purposes of caching character bitmaps

and metrics.

Table 4-3 Entries for Type 1 speciﬁc font dictionaries

Key Type Semantics

CharStrings dictionary

Required. Associates character names (keys) with glyph IDs

(integers). These IDs access data in the 'sfnt' format. Every

Type 42 font must have a notdef entry (usually with glyph ID

0). The value can also be an executable PostScript procedure. See

Section 5.6.3 of the PostScript Language Reference Manual.

CDevProc procedure

Optional. A procedure that derives global changes

algorithmically from a font’s metrics. If this font (or the root font

for which this font is a descendant) has a WMode of 1, this entry is

required. See Section 5.6.2 of the PostScript Language Reference

Manual, for the semantics of this procedure.

Metrics dictionary

Ignored. Adding a Metrics entry will have no effect on a

Type 42 font.

Metrics2 dictionary

Ignored. Adding a Metrics2 entry will have no effect on a

Type 42 font.

PaintType integer

Required. A code indicating how the characters of the font are to

be painted:

0 The character outlines are filled.

2 The outlines (designed to be filled) are stroked.

TrueType fonts are ordinarily created with a PaintType of 0. A

program desiring to convert it to a stroked outline font can copy

the font dictionary, change the PaintType from 0 to 2, add a

StrokeWidth entry, and define a new font using this dictionary.

Note that if PaintType 0 is chosen, the TrueType scan con-

verter is used to render the character. If PaintType2 is chosen,

the grid-ﬁtted TrueType outline is converted to PostScript path

segments and the PostScript scan converter strokes the path.

Private dictionary

Ignored. Type 42 fonts do not require a Private dictionary.

continued

Table 4-2 Type 42 key-value pairs common to all PostScript font dictionaries (continued)

Key Type Semantics

1 2 ... 89 90 91 92 93 94 95 96 97

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