Documented the pat version 1 file format while I was at it.

2003-07-09  Dave Neary  <bolsh@gimp.org>

        * devel-docs/pat.txt: Documented the pat version 1 file
        format while I was at it.

ChangeLog

@@ -1,3 +1,8 @@
+2003-07-09  Dave Neary  <bolsh@gimp.org> 
+
+	* devel-docs/pat.txt: Documented the pat version 1 file
+	format while I was at it.
+
 2003-07-09  Dave Neary  <bolsh@gimp.org> 
 
 	* devel-docs/gbr.txt: Documented the gbr version 2 file

devel-docs/pat.txt

@@ -0,0 +1,44 @@
+
+The GIMP Pattern File Format Version 1 (.pat)
+------------------------------------------------
+
+HEADER
+------
+
+Bytes 0  - 3:  header_size: 
+	Type: 32 bit unsigned int
+	Value: size of pattern header (24) + length of pattern name
+
+Bytes 4  - 7: version
+	Type: 32 bit unsigned int 
+	Value: The file format version.
+
+Bytes 8  - 11: width
+	Type: 32 bit unsigned int 
+	Value: Pattern width
+
+Bytes 12 - 15: height
+	Type: 32 bit unsigned int 
+	Value: Pattern height
+
+Bytes 16 - 19: bytes
+	Type: 32 bit unsigned int 
+	Value: Colour depth of brush. 
+	1 = greyscale, 2 = greyscale + A, 3 = RGB, 4 = RGBA
+
+Bytes 20 - 23: magic_number
+	Type: 32 bit unsigned int 
+	Value: GIMP brush magic number. 
+	('G' << 24) + ('I' << 16) + ('M' << 8) + 'P'
+
+Bytes 24 - (header_size - 24):
+	Type: char *
+	Value: UTF-8 string - name of brush
+
+
+BODY
+----
+	Size: width * height * bytes
+	Type: uchar *
+	Value: Pixel values (row-first) for pattern
+