From b2725867eabc8e872bd7de183c315427631311d1 Mon Sep 17 00:00:00 2001
From: cvs <cvs@282e977c-c81d-0410-88c4-b93c2d0d6712>
Date: Tue, 16 Jan 2001 05:35:49 +0000
Subject: [PATCH] Added file - script will split png images.  MSW 2000-1-15

git-svn-id: svn+ssh://svn.code.sf.net/p/crossfire/code/trunk/arch@715 282e977c-c81d-0410-88c4-b93c2d0d6712
---
 dev/splitter-png.pl | 69 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100755 dev/splitter-png.pl

diff --git a/dev/splitter-png.pl b/dev/splitter-png.pl
new file mode 100755
index 000000000..c4689354d
--- /dev/null
+++ b/dev/splitter-png.pl
@@ -0,0 +1,69 @@
+#!/usr/bin/perl
+
+# File by mwedel@scruz.net to deal with splitting png's.
+# Takes any number of files on the command line, but all the split images
+# are dumped in the current directory.
+# does preserve alpha channel.  Tested on skree images.
+
+$PNGSIZE=32;
+
+for ($i=0; $i <= $#ARGV; $i++) {
+    @name = split(m#/#, $ARGV[$i]);
+    $source = $name[$#name];
+    $#name--;
+    $destdir=join(m#/#, @name);
+    
+    if ($source =~ /(\w+)\.(\d)(\d)(\d)\.png/ ) {
+	$base = $1;
+	$facing = $3;
+	$animation = $4;
+    } else {
+	print STDERR "filename $source does not follow proper naming conventions - don't know how to name files - skipping\n";
+	next;
+    }
+
+    if (!open(DESC,"pngtopnm $ARGV[$i] | pnmfile |")) {
+	print STDERR "Could not run pngtopnm $source | pnmfile\n";
+	next;
+    }
+    $desc = <DESC>;
+    close(DESC);
+    $desc =~ /(\d+) by (\d+)/;
+    if ($1 == 0 || $2 == 0) {
+	print STDERR "File $ARGV[$i] - file not described properly\n";
+	next;
+    }
+    if (($1 % 32) || ($2 % 32)) {
+	print STDERR "File $ARGV[$i] not an increment of 32x32 size - size is $1x$2\n";
+	next;
+    }
+    $destx = $1/32;
+    $desty = $2/32;
+    print "File $ARGV[$i] will be split into $destx X $desty pieces\n";
+
+    $piece = 0;
+    # The order of the for loops of x and y seem non intuitive, but believe
+    # me, this does left to right, top to bottom (ie, as you read and
+    # english language book) in terms of part numbering.
+
+    for ($y=0; $y < $desty; $y++) {
+	for ($x=0; $x < $destx; $x++) {
+	    $piece ++;
+	    # Deal with naming convention.  piece 10 should be A, A ascii
+	    # code starts at 65.
+	    if ($piece > 9 ) {
+		$np = chr($piece + 55);
+	    } else {
+		$np = $piece;
+	    }
+	    $cutx = $x * 32;
+	    $cuty = $y * 32;
+	    system("pngtopnm -alpha $ARGV[$i] | pnmcut -left $cutx -top $cuty -width 32 -height 32 > /tmp/alpha.$$");
+	    system("pngtopnm $ARGV[$i] | pnmcut -left $cutx -top $cuty -width 32 -height 32 > /tmp/png.$$");
+	    system("pnmtopng -alpha /tmp/alpha.$$ /tmp/png.$$ > $base.$np$facing$animation.png");
+	}
+    }
+    # do a little cleanup 
+    unlink("/tmp/alpha.$$");
+    unlink("/tmp/png.$$");
+}