From 7b7cd6da61b1fcc0f2a3ecce2cb9e6c42782c717 Mon Sep 17 00:00:00 2001
From: Henning Makholm <henning@makholm.net>
Date: Fri, 27 Jan 2006 18:00:00 -0500
Subject: Import of release 0.7

---
(limited to 'mktablec.pl')

diff --git a/mktablec.pl b/mktablec.pl
new file mode 100644
index 0000000..32bb0d0
--- /dev/null
+++ b/mktablec.pl
@@ -0,0 +1,67 @@
+#! /usr/bin/perl
+# This short script creates fixed look-up tables for xcftools
+# Copyright (C) 2006  Henning Makholm
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of version 2 of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+use strict ; use warnings ;
+
+sub shipsubarray (@) {
+    while( @_ > 1 && $_[$#_] == 0 ) {
+        pop @_ ;
+    }
+    my $last = pop @_ ;
+    print "  {" ;
+    my $left = 75 ;
+    for my $d ( (map{ $_ . "," } @_), "$last}," ) {
+        if( length($d) > $left ) {
+            print "\n   " ;
+            $left = 75 ;
+        }
+        print $d ;
+        $left -= length($d) ;
+    }
+    print "\n" ;
+}
+
+print "/* Autogenerated by $0 */\n" ;
+print "#include \"pixels.h\"\n" ;
+print "const uint8_t scaletable[256][256] = {\n" ;
+for my $p ( 0..255 ) {
+    shipsubarray( map { int(($p*$_+127)/255) } ( 0 .. 255 ) );
+    # This formula has the property that
+    # scaletable[p][q] + scaletable[255-p][q] == q
+    # for all uint8_t values of p and q.
+    # This is important in order that a partially transparent
+    # pixel does not change the color of the underlying pixel
+    # unless the two pixels have different colors.
+}
+print "};\n" ;
+
+if(0) {
+
+print "const uint8_t divtable[256][256] = {\n" ;
+for my $p ( 0..255 ) {
+    shipsubarray( map { $_ >= $p ? 255 : int(0.5 + 255*$_/$p) }
+                  ( 0 .. 255 ) );
+}
+print "};\n" ;
+
+}
+
+print "const rgba graytable[256] = {\n" ;
+for my $p ( 0..255 ) {
+    print "   (rgba)$p << RED_SHIFT | (rgba)$p << GREEN_SHIFT | (rgba)$p << BLUE_SHIFT,\n" ;
+}
+print "};\n" ;
--
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