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|
#!/usr/bin/perl
##############################################################################
# pnmquantall
##############################################################################
#
# HISTORY:
#
# This was in the original 1989 Pbmplus as a C shell program. In Netpbm 9.13
# (April 2001), it was converted to Bash. (Actually, it was thought to be
# Bourne shell, but it used arrays). In Netpbm 10.58 (March 2012), it was
# converted to Perl for better portability.
#
# The 2012 Perl conversion also changed the name from Ppmquantall to
# Pnmquantall. It had already handled non-PPM input files for many years.
#
# The original program was more complex: Because in those days Pnmcolormap
# and Pnmremap did not exist, Ppmquantall concatenated all the input images
# together and ran Ppmquant (later Pnmquant) on the combination. It then
# split the combination image apart to make one output image per input image.
# Today, Pnmquant is just a combination of Pnmcolormap and Pnmremap, and
# we are able to use them better separately in Ppmquantall: We still make
# the combination image, but use it only to compute the colormap with
# Pnmcolormap. We then apply that colormap separately to each input image
# to produce an output image.
#
# Bryan Henderson wrote the current version from scratch in March 2012
# and contributed it to the public domain.
#
##############################################################################
use strict;
use warnings;
use English;
use Fcntl; # gets open flags
my $TRUE=1; my $FALSE = 0;
sub parseArgs($$$$) {
my ($argvR, $extR, $newColorCtR, $fileNamesR) = @_;
my @argv = @{$argvR};
my $firstArgPos;
if (@argv > 0 && $argv[0] eq "-ext") {
if (@argv < 2) {
print STDERR ("-ext requires a value\n");
exit(100);
} else {
$$extR = $argv[1];
$firstArgPos = 2;
}
} else {
$$extR = "";
$firstArgPos = 0;
}
if (@argv < $firstArgPos + 2) {
print STDERR ("Not enough arguments. You need at least the number " .
"of colors and one file name\n");
exit(100);
}
$$newColorCtR = $argv[$firstArgPos];
@{$fileNamesR} = @argv[$firstArgPos + 1 .. @argv-1];
}
sub tempFile($) {
# We trust Perl's File::Temp to do a better job of creating the temp
# file, but it doesn't exist before Perl 5.6.1.
if (eval { require File::Temp; 1 }) {
return File::Temp::tempfile("pnmquant_XXXX",
SUFFIX=>".pnm",
DIR=>File::Spec->tmpdir(),
UNLINK=>$TRUE);
} else {
my ($suffix) = @_;
my $fileName;
local *file; # For some inexplicable reason, must be local, not my
my $i;
$i = 0;
do {
$fileName = File::Spec->tmpdir() . "/pnmquant_" . $i++ . $suffix;
} until sysopen(*file, $fileName, O_RDWR|O_CREAT|O_EXCL);
return(*file, $fileName);
}
}
sub makeColorMap($$$$) {
my ($fileNamesR, $newColorCt, $colorMapFileName, $errorR) = @_;
my $pnmcatCmd = "pnmcat -topbottom -white -jleft @{$fileNamesR}";
my $pnmcolormapCmd = "pnmcolormap $newColorCt";
my $makeMapCmd = "$pnmcatCmd | $pnmcolormapCmd >$colorMapFileName";
my $termStatus = system($makeMapCmd);
if ($termStatus != 0) {
$$errorR =
"Shell command to create the color map failed: '$makeMapCmd'.";
}
}
sub remapFiles($$$$) {
my ($fileNamesR, $colorMapFileName, $ext, $errorR) = @_;
my ($outputFh, $outputFileName) = tempFile("pnm");
if (!defined($outputFh)) {
$$errorR = "Unable to create temporary file. Errno=$ERRNO";
} else {
for (my $i = 0; $i < @{$fileNamesR} && !$$errorR; ++$i) {
my $inFileName = $fileNamesR->[$i];
my $pnmremapCmd =
"pnmremap '$inFileName' -mapfile=$colorMapFileName " .
">$outputFileName";
my $pnmremapTermStatus = system($pnmremapCmd);
if ($pnmremapTermStatus != 0) {
$errorR =
"Shell command to quantize '$inFileName' failed: " .
"'$pnmremapCmd'";
} else {
my $newFileName = $inFileName . $ext;
unlink($newFileName);
rename($outputFileName, $newFileName)
or $errorR = "Rename to '$newFileName' failed.";
}
}
unlink($outputFileName); # In case something failed
}
}
###############################################################################
# MAINLINE
###############################################################################
my $progError;
parseArgs(\@ARGV, \my $ext, \my $newColorCt, \my @fileNames);
my ($colorMapFh, $colorMapFileName) = tempFile("pnm");
if (!defined($colorMapFh)) {
$progError = "Unable to create temporary file. Errno=$ERRNO";
}
if (!$progError) {
makeColorMap(\@fileNames, $newColorCt, $colorMapFileName, \$progError);
}
print ("got color map\n");
if (!$progError) {
remapFiles(\@fileNames, $colorMapFileName, $ext, \$progError);
}
my $exitStatus;
if ($progError) {
print STDERR ("Failed. $progError\n");
$exitStatus = 1;
} else {
$exitStatus = 0;
}
unlink($colorMapFileName);
exit($exitStatus);
|
