HP Pcl 5 Manual

							ENCharacter Descriptor Formats 11-59 Figure 11-7 Landscape Character Example 
						

							11-60   Soft Font CreationEN
Character Descriptor and Data Format for 
Intellifont Scalable Fonts  
The character header contains a block of bytes that identify character 
outline data. Table 11-40 and Table 11-41 show the format of the 
Intellifont scalable character descriptor and data
.
Table 11-40 Intellifont Scalable Character Descriptor and
Data Format 
Byte  15 (MSB)                             8 7                                   (LSB) 0
0  Format (10)  Continuation (0)
1
1. Continuation is supported for classes 1, 2, 3 and 15 only.
2 Descriptor Size  Class (3)
4  Contour Character Data: (in bytes)
   Msee Table 11-41 for Contour Character Data
#–2 Reserved (0)  Checksum
2
2. These bytes appear only on the last continuation.
Table 11-41 Intellifont Scalable Contour Data Format
Byte 15 (MSB)                            8 7                                    (LSB) 0
4 Contour Data Size  
6 Metric Data Offset 
8 Character Intellifont 
Data Offset
10 Contour Tree Offset 
12  XY Data Offset
14 
Metric Data 
  M
Character Intellifont Data 
  M 
						

							ENCharacter Descriptor Formats 11-61 Contour Tree Data 
  M
XY Coordinate Data 
  M
Table 11-42 Intellifont Scalable Character Descriptors/Data 
Continuation Block
Byte  15 (MSB)                            8 7                                    (LSB) 0
0 Format (10) Continuation (1)
1
1. Continuation is supported for Intellifont scalable fonts for class 3 only.
2  Contour Character Data, resumed:
(in bytes, see Table 11-41.
M
#–2 Reserved  Checksum
2
2. This byte appears only on the last continuation.
Table 11-43 Intellifont Scalable Compound Character Descriptor 
and Data Format
Byte  15 (MSB)                            8 7                                    (LSB) 0
0 Format (10)  Continuation (0)
2  Descriptor Size  Class (4)
4 Compound Character 
Escapement
6 Number of Components
8 Component List
  M   see Table 11-46 for Component List Data
–2 Reserved  Checksum Table 11-41 Intellifont Scalable Contour Data Format  
						

							11-62   Soft Font CreationEN
Format (UB)
This is the first byte of every character data block header. It specifies 
the format of the character descriptor and data. The format number 
for Intellifont scalable fonts is 10.
If the format number is different from that expected by the device, the 
character is discarded.
 Continuation (B)
This is the second (and last) byte of every character data block 
header. It specifies whether the following data is the first (0) data 
block of a new character definition, or a continuation (1) block for a 
character definition which has already been received by the printer. 
Because the value field in a Character Definition command is limited 
to 32767 bytes, characters whose byte count exceed this must be 
sent in two or more blocks. Table 11-42 shows the continuation block 
for an Intellifont Scalable font.
Descriptor Size (UB)    
This is the first byte of the character descriptor. It specifies the size of 
the character descriptor in bytes. The typical descriptor size for 
Intellifont scalable fonts is 2.
Class (UB)    
Specifies the format of the character data. For Intellifont scalable fonts 
values 3 and 4 are used, as described below. Table 11-44
Value Format
4*  LaserJet Family (Raster)
10 Intellifont Scalable
15* TrueType Scalable
* These are described elsewhere in this chapter. 
						

							ENCharacter Descriptor Formats 11-63
Class 3 -Intellifont Scalable Character Contour Data
Class 3 is for Intellifont scalable contour character data. The contour 
character data is organized as described in Table 11-41. Bytes 0-3 
contain the character descriptor.
Class 4 - Intellifont Scalable Compound Character 
Data
A class 4 character is a compound character and composition data 
follows. The composition data is organized as described in Table 
11-43. The compound descriptor allows combining two different 
characters to produce a single compound character.
Contour Data Size (UI)
The size of the contour data including the size of this field. For a 
detailed description of this field, refer to Intellifont Scalable Typeface 
For mat.
Metric Data Offset (SI)   
The offset to the Metric Data relative to the address of the Contour 
Data Size field. Table 11-45
Value Class
1* Bitmap
2* Compressed Bitmap
3 Contour (Intellifont Scalable)
4  Compound Contour (Intellifont Scalable)
15* TrueType Scalable
* These are described elsewhere in this chapter. 
						

							11-64   Soft Font CreationEN
Character Intellifont Data Offset (SI)   
The offset to the Character Intellifont Data relative to the address of 
the Contour Data Size field.
Contour Tree Offset (SI)   
The offset to the contour Tree Data relative to the address of the 
Contour Data Size field.
XY Data Offset (SI)  
The offset to the XY data relative to the address of the Contour Data 
Size field. 
Metric Data
For information about Metric Data refer to the Intellifont Scalable 
Ty p e f a c e  F o r m a t document.
Character Intellifont Scalable Data  
For information about Character Intellifont Scalable Data, refer to 
Intellifont Scalable Typeface Format.
Contour Tree Data   
For information about Contour Tree Data, refer to Intellifont Scalable 
Ty p e f a c e  F o r m a t.
XY Coordinate Data   
For information about XY Coordinate Data, refer to Intellifont Scalable 
Ty p e f a c e  F o r m a t. 
NoteFor information on obtaining the Intellifont Scalable Typeface Format 
document, refer to Related Documents in the front of this manual.
Checksum   
This is a checksum of all the contour character data. The checksum 
value is contained only in the last character data block. 
						

							ENCharacter Descriptor Formats 11-65
Compound Character Escapement (SI)  
The escapement in design units of a compound character.
Number of Components (UB)   
The number of components of a compound character.
Component List   
This is a list of component descriptions. The list contains Number of 
Components elements. Each component descriptor consists of 6 
bytes as described in Table 11-46 below.
The Character Code is the character code number of a component of 
a compound character. X-offset is the offset of that component from 
the reference point (origin) in the x direction in design units. Y-offset is 
the offset in the y direction of a component from the reference point 
(origin) in design units.
NoteThe character code may be greater than the last code of the symbol 
set that is implied by the font type since a compound character can 
include components that are not part of the symbol set.
Character Descriptor and Data Format for 
TrueType Fonts
Table 11-47 shows the format of the TrueType character descriptor 
and data when a continuation block is not required. Table 11-49 
(next page) shows the format of the TrueType character descriptor 
and data with multiple character data blocks. Table 11-46 Component Descriptor 
Byte  15 (MSB)                            8 7                                    (LSB) 0
0 Character Code
2 X Offset
4 Y Offset  
						

							11-66   Soft Font CreationEN
Table 11-47 TrueType Character Descriptor (no continuation 
block required) 
Byte  15 (MSB)                            8 7                                    (LSB) 0
0 Format (15)  Continuation (0)
2  Descriptor Size  Class (15)
4  [additional descriptor data may be inserted here]
2 + 
Desc 
Size Character Data Size
4 + 
Desc 
Size  Glyph ID
6 + 
Desc 
Size TrueType Glyph Data
     M
# – 2  Reserved  Checksum
# = Character data block size as defined in Character Definition 
command. 
Table 11-48
Byte  15 (MSB)                            8 7                                    (LSB) 0
0 Format (15)  Continuation (0)
2  Descriptor Size  Class (15)
4[additional descriptor data may be inserted here]
2 + 
Desc 
Size  Character Data Size
4 + 
Desc 
Size Glyph ID 
						

							ENCharacter Descriptor Formats 11-67
Format (UB)  
This is the first byte of every character data block header. It specifies 
the format for character downloading. The number 15 designates the 
TrueType character format.6 + 
Desc 
Size beginning of TrueType Glyph Data
       M
Table 11-49 TrueType Character Descriptor (multiple character 
data blocks) 
Byte  15 (MSB)                            8 7                                    (LSB) 0
0 Format (15)  Continuation (1)
2  conclusion of TrueType Glyph Data
M
# – 2  Reserved  Checksum
 # = Character data block size as defined in Character Definition 
command. 
Table 11-50
Value Format
4* LaserJet Family (Raster)
10* Intellifont Scalable
15 TrueType Scalable
* These are described elsewhere in this chapter. Table 11-48  (continued) 
						

							11-68   Soft Font CreationEN
Continuation (B)   
This is the second (and last) byte of every character data block 
header. It specifies whether the following data is the first (0) data 
block of a new character definition, or a continuation (1) block for a 
character definition which has already been received by the printer. 
Because the value field in a Character Definition command is limited 
to 32767 bytes, characters whose byte count exceed this must be 
sent in two or more blocks.
Descriptor Size (UB)     
This is the first byte of the character descriptor. It specifies the size of 
the character descriptor in bytes. The character descriptor includes 
everything that is both after the continuation byte and prior to the 
Character Data Size field. The TrueType character descriptor includes 
this Descriptor Size byte plus the following Class byte. The minimum 
value for Descriptor Size is therefore 2. (Additional descriptor 
information, if any, can be added immediately after the Class byte.)
Class (UB)
This field is used to distinguish different character data types within a 
given character format. (For instance, among Intellifont characters of 
format 10, the Class byte is used to distinguish compound characters 
from simple Intellifont contour characters.) All TrueType scalable 
characters are handed to the TrueType font scaler in the same format, 
consequently, the Class byte does not provide vital new information. 
For TrueType, set the Class value to 15.
Table 11-51
Value Class
1* Bitmap
2* Compressed Bitmap
3*  Contour (Intellifont Scalable)
4*  Compound Contour (Intellifont Scalable)
15 TrueType Scalable
* These are described elsewhere in this chapter.