HP Pcl 5 Manual

ENFont Header Format 11-39
Checksum   
The Checksum field is over bytes 64 through the end of the header. 
The checksum should contain a value which, when added to the sum 
of byte 64 through the reserved byte, equals a value which, when 
divided by 256 (modulo 256 arithmetic), results in a remainder of 0. 
For example, if the sum = 10,234 then, 10,234 mod 256 = 250. 
Therefore, the checksum should = 6 (since 250+6 = 256 which 
would produce 0 [mod 256]).
NoteIn the Format 15 Font Header for TrueType...

11-40   Soft Font CreationEN
Table 11-30 below shows the structure of the Segmented Font Data 
section.
Segment Identifier (UI)
Each entry in the Segmented Font Data Section has its own unique 
identification number. The following values are defined: Table 11-30 Segmented Font Data 
Byte 15 (MSB)                               8  7                           (LSB) 0
x + 0 First segment, Segment Identifier
x + 2 First segment, Segment Size
x + 4
MFirst segment, Data Segment
M
x + 4
+ 1st
seg size 
Second...

ENFont Header Format 11-41 Data segments with an unrecognized identifier are ignored.
Segment Size (UI)   
For each entry in the Segmented Font Data section, the Segment 
Size indicates the number of bytes in the immediately following Data 
Segment. The size for the Null Segment is 0.
Formats of Data Segments    
AP (Application Support Segment) The definition of this segment is 
reserved.
CC (Character Complement) This field has the same form (i.e., 8 
unsigned bytes) and function as does the Character...

11-42   Soft Font CreationEN
The optional cvt, fpgm and prep tables, as defined in True Type Font 
Files, typically appear in the Global TrueType Data Segments of 
hinted TrueType soft fonts, but should not appear in unhinted fonts.
IF (Intellifont Face Data) Reserved for future use.
PA (PANOSE Description) This data segment of variable length may 
be used for the purpose of font selection and substitution. Its 
definition continues to evolve. A 10-field (10-byte) version sufficient 
for the description...

ENFont Header Examples 11-43
Font Header Examples 
Two examples for downloading a Font Header are provided below; 
one for a bitmap font and one for an Intellifont scalable font.
Bitmap Example   
To download a bitmap font header for a portrait HP Roman-8, 10 
pitch, 12 point, upright, medium, Courier font, with an ID number of 
one, send: 
E
C*c1D   (set Font ID to 1)
E
C)s#W   (# = 64 bytes of font descriptor data  
+ x bytes of optional data)
An example of the bitmap header is shown on the following...

11-44   Soft Font CreationEN
Intellifont Scalable Example    
To download an Intellifont scalable header for an HP Roman-8, 
upright, medium, CG Times scalable font, with an ID number of one, 
send:
E
C*c1D  (set Font ID to 1)
E
C)s#W  (# = 80 bytes of font descriptor data + x bytes
of Global Intellifont data + x bytes of optional data) Style LSB  0  Upright, Normal Width, Solid 
(0,0,0)
Stroke Weight  0  Medium
Typeface LSB  3  Body Text
Typeface MSB  0  No Font Vendor ID
Serif Style  2  Serif Line...

ENFont Header Examples 11-45 Table 11-33
FIELD NAME VALUE DESCRIPTION
Descriptor Size 80 Bytes
Header Format 10 Scalable Font Format
Font Type 1 Eight Bit
Style MSB 0
Reserved 0
Baseline Location 5380 Y reference in Design 
Window
Cell Width 0 ..not defined for Intellifont
Cell Height 0 ..not defined for Intellifont
Orientation 0 ..not defined for scalable 
fonts
Spacing 1 Proportional
Symbol Set  277 8U: Roman-8
Pitch 2602 29.63% Em Default HMI
Design Height 2000 250 Points * 8
x-Height 4009 45.65% Em,...

11-46   Soft Font CreationEN
Placement 0 ..not defined for scalable 
fonts
Underline 
Position0 ..not defined for scalable 
fonts
Underline 
Thickness0 ..not defined for scalable 
fonts
Text Height   0  ..not defined for Intellifont
Text Width   4391  Width of En Space
First code   33
Last Code   273  Compound Pieces Present 
(n255)
Pitch Extended   0  ..not defined for scalable 
fonts
Height Extended   0  ..not defined for scalable 
fonts
Cap Height   5851  66.7% Em
Font  Number hex 43 01 69 54  Native,...

ENFont Header Examples 11-47 ....Global 
Intellifont Data ....}= 112 bytes added to 
header data
....Copyright 
Statement 
(optional) ....}= x bytes added to header 
data
....Application 
Support 
(optional) ....}= x bytes added to header 
data Table 11-33  (continued) 

11-48   Soft Font CreationEN
Character Definitions 
Following the font header, the individual characters must be defined. 
Every PCL character definition contains a character descriptor and a 
body of character data. The character definition always consists of 
one or more character data blocks. Each character data block begins 
with its own header. The character data block header always has a 
size of 2 bytes.
The first data block of a character definition must always have a 
character descriptor...