HP PCL 5 Comparison Manual page 83

If the Vertical Rotation Segment is not downloaded with
the font definition, a default value is used for the
Descender value. The default value is set to the following:
Descender value = -36/256 * ScaleFactor
Where: ScaleFactor is Bytes 64 and 65 from the
Font Format 16 Font Header.
Character Enhancement Segment
This segment indicates whether the pseudo-bold or
pseudo-italic enhancements can be performed on a
downloaded font.
The structure of the Character Enhancement Segment is:
Byte 15 (MSB)
0 CE (17221)
2 Data Segment Size (8)
4
6 Style
8
10 Stroke Weight
12 Reserved
* This segment is for Font Format 16. The Data Segment Size field for Font Format 16
fonts is 4 bytes; the segment for Font Format 15 fonts is identical except the Data
Segment Size field is 2 bytes instead.
Style (UINT32)—This field specifies the style types that
the printer is allowed to perform on the font characters.
31
Reserved
Bit Positions (#) = Posture
1 = Italics
0, 2, 3 = Reserved
8 7 (LSB) 0
4 3
Printer-Specific Differences 2-47
Byte
1
3
5
7
9
11
13
0
Posture