HP Pcl 5 Manual

							ENUnbound Scalable Fonts 9-9
Symbol Collections   
The symbols in an unbound font (typeface) can be divided into 
symbol collections. These symbol collections identify the symbols 
according to some language basis or special application usage. 
Some symbol collections include: Basic Latin, East European, 
Turkish, Math, Semi-Graphic, and Dingbats. If a symbol collection is 
included in an unbound font, all of the symbols of that collection are 
included.
NoteSee Appendix D in the PCL 5 Comparison Guide to identify symbols 
in the various collections.
The symbols within a symbol collection do not change from one 
unbound font to the next. For example, the Basic Latin collection 
always contains the same symbols. Different fonts may contain 
different symbol collections. For example, the internal Univers 
typeface contains the Latin, Math, and Semi-Graphic collections 
(these collections contain all the symbols required for the 35 symbol 
sets that Univers supports). The ITC Zapf Dingbats typeface, on the 
other hand, contains only the Dingbats collection, which includes all 
the symbols required for the five supported symbol sets.
When searching unbound scalable fonts (during font selection) for 
those that match the requested symbol set, the printer actually 
searches for symbol collections. To identify symbol collections which 
meet the needs of the requested symbol set, the printer uses two 
numbers: the Character Requirements number and the Character 
Complement number. 
						

							9-10   Font ManagementEN
Character Complement Numbers   
The “Intellifont Unbound Scalable Font Header” (header) includes a 
64 bit field (bytes 78-85) which contains the Character Complement 
number. For TrueType fonts, in the “Format 15 Font Header for 
Scalable Fonts” (unbound), the Character Complement number is 
included in the accompanying “Segmented Font Data” section of the 
header.
The Character Complement number identifies the symbol collections 
in the font. Each bit in this field corresponds to a symbol collection 
(not all bits are currently defined; refer to Appendix D in the PCL 5 
Comparison Guide).
Intellifont example: If bits 63 and 34 are cleared (set to zero) it 
indicates that the unbound font contains the Basic Latin (bit 63) and 
Math (bit 34) symbol collections and that the character index is in 
HP’s MSL numbers (bit 0).
TrueType example: If bits 31, 30, and 0 are cleared (set to zero), it 
indicates that the unbound font contains ASCII, Latin 1 extensions 
and is based on Unicode numbers.
Character Requirements Number   
The other number the printer uses to determine symbol set 
compatibility, the Character Requirements number, is provided as 
part of the information contained in the symbol set. The Character 
Requirements number is a 64-bit number analogous to the Character 
Complement number; however, it identifies the symbol collections 
needed by the symbol set.
Intellifont example: If a symbol set based on HP’s MSL numbers 
requires one or more characters from the standard Latin collection 
and some of the characters from the Math collection then bits 63 and 
34 are set to one (refer to Appendix D in the PCL 5 Comparison 
Guide for information regarding the various symbol collections). 
						

							ENUnbound Scalable Fonts 9-11 TrueType example: If a symbol set based on Unicode numbers 
requires one or more characters from the standard ASCII collection 
and some of the characters from the Latin 5 collection, then bits 31, 
28 and 0 are set to one (refer to Appendix D in the PCL 5 Comparison 
Guide for information regarding the various symbol collections).
As stated above, to determine which unbound scalable fonts contain 
the symbols for the specific symbol set, the printer must identify those 
unbound fonts that contain the symbol collections of the requested 
symbol set. To do this, the printer accesses the Character 
Requirements number for the requested symbol set. If, for example, 
the Roman-8 symbol set was requested, the printer would access the 
Character Requirements number from the Roman-8 symbol set 
information in the printer. This number is then compared with the 
Character Complement number of each unbound font in the printer. If 
any matches are found, those unbound fonts are included in the list of 
potential fonts for selection.
Final Font Selection   
After the process above is complete, the printer contains a list of all 
fonts (bitmap, bound, and unbound) which support the requested 
symbol set. (If no fonts are found for the specified symbol set, 
Roman-8 is used. If more than one font remains, the printer continues 
comparing font selection characteristics, eliminating fonts, until only 
one remains. Whenever only one font remains, it is selected for 
printing.
Symbol Set Mapping Table        
The printer receives character codes in the range 0-255 which, 
depending on the selected symbol set, identify the symbols to print or 
control codes to execute.
There are hundreds of symbols available in unbound fonts in 
HP LaserJet printers, more than can be identified by the character 
code range (0 - 255). A list of these symbols is provided in the 
symbol indexes, such as the Master Symbol List (MSL) and the 
Unicode list In Appendix D of the PCL 5 Comparison Guide). Each 
symbol in the list is identified by a unique MSL or Unicode number. 
Symbols in unbound fonts are identified by this number. 
						

							9-12   Font ManagementEN
Since the printer identifies symbols by their symbol index number 
(range from 0 to 65535), but receives character codes (range 0-255), 
a relation must be made between the character codes and the larger 
range of symbol index numbers. This relation is defined by the symbol 
set mapping table.
The printer contains a symbol set mapping table for each available 
symbol set. These tables list the character code range and 
corresponding list of symbol index numbers. Using this mapping the 
printer identifies which indexed character is printed for the character 
code in the current symbol set.
A partial symbol set mapping table is shown in Table 9-1 for the 
Roman-8 symbol set.
Table 9-1 Roman-8 Symbol Index Mapping
Character CodeMSL Index 
(decimal)Unicode Index 
(hexadecimal)
32  0 
33   1   0021
34   2   0022
35   3   0023
36   4   0024
37   5   0025
38   6   0026
39   8   2019
40   9   0028
41   10   0029
MM    M
252   189   25a0
253   190   00bb
254   191   00b1  
						

							ENUnbound Scalable Fonts 9-13
Printing a Character  
When an unbound font is selected for printing and a character code is 
received, the printer accesses the requested symbol set mapping 
table to identify the MSL or Unicode number. For example, if the 
Roman-8 symbol set is selected and the printer receives character 
code 254, the printer accesses the Roman-8 symbol set mapping 
table (Table 9-1). In the Roman-8 mapping table, character code 254 
is mapped to MSL number 191 or Unicode number 00b1 
(plus-over-minus symbol). Thus, to print character code 254, the 
printer searches the selected unbound font for the correct MSL or 
Unicode number and prints that character. 
						

							9-14   Font ManagementEN 
						

							ENIntroduction  10-1
10
User-Defined Symbol 
Sets      
Introduction 
User-defined symbol sets are used with unbound scalable fonts. 
Three new commands provide for the implementation of 
user-defined symbol sets:
Symbol Set ID Code - 
E
C*c#R 
Define Symbol Set - 
E
C(f#W [symbol set data] 
Symbol Set Control - 
E
C*c#S
To define a symbol set, you must first designate a symbol set ID 
code. Next, use the Define Symbol Set command to download 
the list of characters (character codes and related symbol index 
numbers) for the symbol set. Once this is accomplished, you may 
select the symbol set for printing in the same manner as any 
symbol set using the symbol set selection sequence: 
E
C(ID
Once a user-defined symbol set is downloaded, the Symbol Set 
Control command can be used to assign symbol sets as either 
temporary or permanent and to delete them. 
						

							10-2   User-Defined Symbol SetsEN
Symbol Set ID Code Command 
The Symbol Set ID Code command assigns a symbol set ID code to a 
user-defined symbol set. This ID code is used by the Symbol Set 
Control command for symbol set management.
The ID code corresponds to the symbol set ID selection value 
which is used to identify the symbol set during font selection.
E
C * c # R
#  =   Symbol Set ID Code (decimal)
Default =0
Range = 0 - 32,767 (larger values are outside the legal range)
When downloading a symbol set, the symbol set ID value must match 
the Encoded Symbol Set Designator field in the user-defined symbol 
set header.
As mentioned above, the symbol set ID code is related to a symbol 
set ID value. The relationship between the ID code and the symbol 
set ID selection value is shown by the following formula:
Symbol Set ID code = (# * 32) + (ID - 64)
where: “#” represents the number portion of the ID selection value 
which may range from 0-1023; and, “ID” represents the ordinal 
(decimal) value of the ID character. (Symbol set ID selection values 
consist of a number and a letter, such as 8U for Roman-8 or 7J for 
DeskTop etc.)
For example:
Assume the ID selection value selected for this symbol set is 17Q, 
then:
 (17 * 32) + (81 - 64) = 561
The symbol set ID code is 561. 
						

							ENSymbol Set ID Code Command 10-3 When selecting an ID code, select one which is not being used 
currently. (If an ID code is selected which is already being used in 
the printer, that symbol set is redefined.) The first step in selecting an 
ID code is to determine an ID selection value. Since it may be difficult 
to determine which ID selection values are being used, it is best to 
select one which has not been assigned. Refer to Appendix C in the 
PCL 5 Comparison Guide to select a number/letter (ID selection 
value) combination which has not been assigned. 
After the ID selection value has been determined, use the conversion 
formula (shown above) to convert the ID value to an ID code.
To create a user-defined symbol set:
1Identify the symbols (symbol index numbers) for the symbol 
set from the MSL or Unicode list in Appendix D of the PCL 5 
Comparison Guide. List them in the appropriate character 
code order.
2Identify the symbol collections (and Character Requirement bits) 
that contain the symbols (Appendix D of the PCL 5 Comparison 
Guide).
3Identify the Define Symbol Set command header information.
4Identify a symbol set ID selection value and convert it into its 
symbol set ID code.
5Designate the ID code using the Symbol Set ID Code command.
6Download the symbol set header data and MSL or Unicode 
numbers using the Define Symbol Set command. 
To print using the symbol set, it must be selected using the Select 
Symbol Set command - 
E
C(ID, where ID is the symbol set ID 
selection value used to calculate the symbol set ID code. 
						

							10-4   User-Defined Symbol SetsEN
Define Symbol Set 
This command defines the characters and character mapping for a 
user-defined symbol set.
E
C ( f # W [symbol set definition data]
#  =   Number of bytes in symbol set definition
Default =n/a
Range = 0 - 32767
If a user-defined symbol set is already present in the printer and a 
new, valid symbol set is downloaded with the same Symbol Set ID 
Code, then the old symbol set is deleted. If an internal symbol set with 
the same ID code exists, it is overridden by the new symbol set. If the 
symbol set definition is invalid, the command is ignored. If there is 
insufficient memory to create the symbol set, the symbol set is 
discarded.
NoteSend the Symbol Set ID Code command prior to the Define Symbol 
Set command to assign an ID code for the user-defined symbol set. If 
the Symbol Set ID Code command is not sent, the last code sent is 
used. If none have been sent, then the default (0) is assigned. 
The data format for the user-defined symbol set is shown in 
Table 10-1.
Table 10-1 User-Defined Symbol Set Defintion Format
Byte   15 - MSB8   7LSB - 0
0 Header Size (18)
2 Encoded Symbol Set 
Designator
4 Format Symbol Set Type
6First Code
8 Last Code
10 Character Requirements
Hdr 
SizeSymbol Map [Last Code — First Code + 1]
M