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root |
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#!/usr/bin/perl |
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# File by mwedel@scruz.net to deal with splitting png's. |
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# Takes any number of files on the command line, but all the split images |
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# are dumped in the current directory. |
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# does preserve alpha channel. Tested on skree images. |
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# Modification by PeterM |
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# Notes: I don't really know how this script was supposed to work |
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# I use it like this: |
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# > mkdir out (makes an output directory so I don't clobber my input) |
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# > split-png-linux.pl file.111.png |
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# |
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# The results end up in the directory "out" |
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$PNGSIZE=32; |
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for ($i=0; $i <= $#ARGV; $i++) { |
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@name = split(m#/#, $ARGV[$i]); |
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$source = $name[$#name]; |
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$#name--; |
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$destdir=join(m#/#, @name); |
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if ($source =~ /([\w-]+)\.(\d)(\d)(\d)\.png/ ) { |
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$base = $1; |
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$facing = $3; |
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$animation = $4; |
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} else { |
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print STDERR "filename $source does not follow proper naming conventions - don't know how to name files - skipping\n"; |
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next; |
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} |
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if (!open(DESC,"pngtopnm $ARGV[$i] | pnmfile |")) { |
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print STDERR "Could not run pngtopnm $source | pnmfile\n"; |
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next; |
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} |
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$desc = <DESC>; |
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close(DESC); |
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$desc =~ /(\d+) by (\d+)/; |
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if ($1 == 0 || $2 == 0) { |
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print STDERR "File $ARGV[$i] - file not described properly\n"; |
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next; |
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} |
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if (($1 % 32) || ($2 % 32)) { |
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print STDERR "File $ARGV[$i] not an increment of 32x32 size - size is $1x$2\n"; |
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next; |
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} |
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$destx = $1/32; |
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$desty = $2/32; |
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print "File $ARGV[$i] will be split into $destx X $desty pieces\n"; |
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$piece = 0; |
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# The order of the for loops of x and y seem non intuitive, but believe |
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# me, this does left to right, top to bottom (ie, as you read and |
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# english language book) in terms of part numbering. |
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for ($y=0; $y < $desty; $y++) { |
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for ($x=0; $x < $destx; $x++) { |
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$piece ++; |
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# Deal with naming convention. piece 10 should be A, A ascii |
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# code starts at 65. |
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if ($piece > 9 ) { |
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if($piece > 9 + 26) { |
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$np = chr( $piece + 55 + 6 ) |
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} else { |
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$np = chr($piece + 55); |
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} |
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} else { |
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$np = $piece; |
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} |
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$cutx = $x * 32; |
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$cuty = $y * 32; |
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system("pngtopnm -alpha $ARGV[$i] | pnmcut $cutx $cuty 32 32 > /tmp/alpha.$$"); |
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system("pngtopnm $ARGV[$i] | pnmcut $cutx $cuty 32 32 > /tmp/png.$$"); |
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system("pnmtopng -alpha /tmp/alpha.$$ /tmp/png.$$ > out/$base.$np$facing$animation.png"); |
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} |
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} |
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# do a little cleanup |
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unlink("/tmp/alpha.$$"); |
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unlink("/tmp/png.$$"); |
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} |
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# system("pngtopnm -alpha $ARGV[$i] | pnmcut -left $cutx -top $cuty -width 32 -height 32 > /tmp/alpha.$$"); |
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# system("pngtopnm $ARGV[$i] | pnmcut -left $cutx -top $cuty -width 32 -height 32 > /tmp/png.$$"); |
