Public Painter file format - Revision history

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2018-06-03T23:01:18Z

2 revisions imported

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2017-01-07T05:34:14Z

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<pre>
Public Painter *.CMP

Always monochrome.

1 byte flag [used during decompression]
1 byte size [0 = A5/640x400, 200 = A4/640x800]
-------
2 bytes total for header

? image data:

The image data is always RLE compressed.

Depending on the size field the uncompressed image will be 32000 or 64000 bytes.

Decompression code -> parameters:
data = source address (compressed image data)
bmap = destination address (uncompressed monochrome image data)
flag = first item from file header
cds = compressed data size (file size minus sizeof(header))

uint32 decode_cmp(uint8 *data, uint8 *bmap, uint8 flg, uint32 cds) {
register uint8 byt, cmd;
register uint16 i, cnt;
register uint32 dst=0, src=0;

do {
cmd = data[src++];
if (cmd == flg) { /* repeat? */
cnt = 1 + data[src++];
byt = data[src++];
for (i=0; i<cnt; i++) {
bmap[dst++] = byt;
}
} else { /* literal ? */
bmap[dst++] = cmd;
}
} while (src<cds);
return dst;
}
</pre>
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← Older revision	Revision as of 23:01, 3 June 2018
(No difference)

@@ Line 20: / Line 20: @@
    flag = first item from file header
    cds  = compressed data size (file size minus sizeof(header))
-−
 uint32 decode_cmp(uint8 *data, uint8 *bmap, uint8 flg, uint32 cds) {
      register uint8  byt, cmd;