GRASP font

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See [[GRASP GL]] for more information about GRASP, and related formats.
 
See [[GRASP GL]] for more information about GRASP, and related formats.
  
== Format ==
+
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".
GRASP font files have a 7-byte header with no identifying signature, followed by the glyph bitmap data.
+
 
 +
== 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.''
 +
 
 +
{| class="wikitable"
 +
! Offset !! Type !! Description
 +
|-
 +
|0  || byte      || Always 0x10?
 +
|-
 +
|1  || byte[13]  || Font name / filename, terminated by a NUL byte
 +
|-
 +
|16  || byte      || Number of characters in the file. The maximum allowed might be 94.
 +
|-
 +
|19  || byte      || Glyph physical pixel width
 +
|-
 +
|20  || byte      || Glyph pixel height
 +
|-
 +
|21  || byte      || Number of bytes per row in a glyph bitmap (?)
 +
|-
 +
|25  || int16    || File size
 +
|-
 +
|59  || int16    || Unknown (''not'' a pointer to the bitmap for the space character, logical as that would be)
 +
|-
 +
|61  || int16[94] || Table of glyph bitmap offsets, relative to the beginning of the file
 +
|-
 +
|249 || byte      || Unknown; possibly the width of a space character
 +
|-
 +
|250 || byte[94]  || Table of glyph logical pixel widths
 +
|}
 +
 
 +
Character codes are approximately ASCII, with the first character in the tables being ASCII 33 ("!").
 +
 
 +
Each glyph's bitmap, as stored in the file, is the same size. The "widths table" tells how many columns are meaningful.
  
 
== Sample files ==
 
== Sample files ==
 +
=== Original format ===
 +
* [http://cd.textfiles.com/carousel344/008/GRASP11C.ZIP GRASP11C.ZIP] → *.SET
 
* [http://cd.textfiles.com/vgaspectrum/animate/gl/cgademo.gl cgademo.gl] → chapter.set
 
* [http://cd.textfiles.com/vgaspectrum/animate/gl/cgademo.gl cgademo.gl] → chapter.set
 
* [http://cd.textfiles.com/vgaspectrum/animate/gl/grafx.gl grafx.gl] → square.set
 
* [http://cd.textfiles.com/vgaspectrum/animate/gl/grafx.gl grafx.gl] → square.set
 +
 +
=== New format ===
 +
* [http://cd.textfiles.com/vgaspectrum/animate/gl/duck.gl duck.gl] → rome25.set
 +
* [http://cd.textfiles.com/vgaspectrum/animate/gl/v7vga.gl v7vga.gl] → book.set
 +
* [http://cd.textfiles.com/gamefest2/SOFT/ED/PRO10/AMULT.GL AMULT.GL] → gaston.set, helvet20.set, mysmall.set
 +
* [http://cd.textfiles.com/gamefest2/SOFT/ED/PRO12/ACLOCK.GL ACLOCK.GL] → lcd.set
  
 
== Links ==
 
== Links ==
 
* {{EGFF|grasp|GRASP File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]] ("Font File" section)
 
* {{EGFF|grasp|GRASP File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]] ("Font File" section)
 
* [http://www.textfiles.com/programming/FORMATS/glformat.txt glformat.txt] ("Font Files" section)
 
* [http://www.textfiles.com/programming/FORMATS/glformat.txt glformat.txt] ("Font Files" section)
 
== Editors' notes ==
 
It appears that there is a second GRASP font format, that is quite different from the one that is documented. It possibly begins with 0x10, has a name at offset 1, and the file size at offset 25.
 
 
Examples:
 
* [http://cd.textfiles.com/vgaspectrum/animate/gl/duck.gl duck.gl] → rome25.set
 
* [http://cd.textfiles.com/vgaspectrum/animate/gl/v7vga.gl v7vga.gl] → book.set
 

Latest revision as of 17:02, 7 January 2017

File Format
Name GRASP font
Ontology
Extension(s) .set, .fnt

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

[edit] Format details

[edit] Original format

Files have a 7-byte header with no identifying signature, followed by the glyph bitmap data. See the Links section for documentation.

[edit] 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 characters in the file. The maximum allowed might be 94.
19 byte Glyph physical pixel width
20 byte Glyph pixel height
21 byte Number of bytes per row in a glyph bitmap (?)
25 int16 File size
59 int16 Unknown (not a pointer to the bitmap for the space character, logical as that would be)
61 int16[94] Table of glyph bitmap offsets, relative to the beginning of the file
249 byte Unknown; possibly the width of a space character
250 byte[94] Table of glyph logical pixel widths

Character codes are approximately ASCII, with the first character in the tables being ASCII 33 ("!").

Each glyph's bitmap, as stored in the file, is the same size. The "widths table" tells how many columns are meaningful.

[edit] Sample files

[edit] Original format

[edit] New format

[edit] Links

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