GRASP font
GRASP font is a bitmap font format associated with the GRASP animation software. Some GRASP GL archive files contain one or more GRASP font files.
See GRASP GL for more information about GRASP, and related formats.
It appears that there is a second GRASP font format, that is significantly different from the one that is documented. We'll call the documented format "original format", and the other format "new format".
Contents |
Format details
Original format
Files have a 7-byte header with no identifying signature, followed by the glyph bitmap data. See the Links section for documentation.
New format
This is a partial decoding of the format, based on reverse engineering and guesswork.
| Offset | Type | Description |
|---|---|---|
| 0 | byte | Always 0x10? |
| 1 | byte[13] | Font name / filename, terminated by a NUL byte |
| 16 | byte | Number of valid characters, minus 1. The maximum allowed might be 94 (meaning 95). |
| 19 | byte | Glyph (maximum) pixel width |
| 20 | byte | Glyph pixel height |
| 21 | byte | Number of bytes per row in a glyph bitmap |
| 25 | int16 | File size |
| 59 | int16[95] | Table of glyph bitmap offsets, relative to the beginning of the file |
| 249 | byte[95] | Table of glyph logical pixel widths |
Based on this interpretation of the format, the first character in the tables is ASCII 32 (space). However, it seems that sometimes the first character does not have valid bitmap data, so maybe it should be ignored.
Each glyph's bitmap, as stored in the file, is the same size. The "widths table" tells how many columns are meaningful.
Sample files
Original format
- GRASP11C.ZIP → *.SET
- cgademo.gl → chapter.set
- grafx.gl → square.set
New format
- duck.gl → rome25.set
- v7vga.gl → book.set
- AMULT.GL → gaston.set, helvet20.set, mysmall.set
- ACLOCK.GL → lcd.set
Links
- GRASP File Format Summary, from the Encyclopedia of Graphics File Formats ("Font File" section)
- glformat.txt ("Font Files" section)
