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0003_CHR.pas
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Pascal/Delphi Source File
|
1996-09-04
|
2KB
|
61 lines
--------F-CHR-------------------------------
The CHR files are scalable fonts used by the Borland graphics interface
(BGI) to display fonts in graphics mode.
OFFSET Count TYPE Description
0000h 4 char ID='PK',08,08
0004h 4 char ID='BGI '
0008h ? char Font description, terminated with #26
0008h 1 word Headersize
+???? ="SIZ"
4 char Internal font name
1 word Font file size in bytes
1 byte Font driver major version
1 byte Font driver minor version
1 word 0100h
"SIZ" word Zeroes to pad out the header
0080h 1 char Signature byte, '+' means stroke font
0081h 1 word Number of chars in font file
="NUM"
0083h 1 byte undefined
0084h 1 byte ASCII value of first char in file
0085h 1 word Offset to stroke definitions
0087h 1 byte Scan flag ??
0088h 1 byte Distance from origin to top of capital
0089h 1 byte Distance from origin to baseline
008Ah 1 byte Distance from origin to bottom descender
008Bh 4 char Four character name of font
0090h "NUM" word Offsets to character definitions
0090h+ "NUM" byte Width table for the characters
"NUM"*2
0090h+ Start of character definitions
"NUM"*3
The individual character definitions consist of a variable number of
words describing the operations required to render a character. Each
word consists of an (x,y) coordinate pair and a two-bit opcode, encoded
as shown here:
Byte 1 7 6 5 4 3 2 1 0 bit #
op1 <seven bit signed X coord>
Byte 2 7 6 5 4 3 2 1 0 bit #
op2 <seven bit signed Y coord>
Opcodes
op1=0 op2=0 End of character definition.
op1=0 op2=1 Do scan
op1=1 op2=0 Move the pointer to (x,y)
op1=1 op2=1 Draw from current pointer to (x,y)
EXTENSION:CHR
OCCURENCES:PC
PROGRAMS:Borland Pascal, Borland C
REFERENCE:BGIKIT.ZIP
SEE ALSO:
VALIDATION: