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- --------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:
-