I recently released picwoodpecker which latest version with a minor fix is on github.

It seems the program does not run well on Linux (it was developped and tested on win7 only).

With a bit of pain i'v set up a Linux Ubuntu 16.04 LTS 32 bit as a virtual machine using virtualbox.

The problem arise when the application try to use the copyResampled GD method:

GD Warning: one parameter to a memory allocation multiplication is neg
+ative or zero, failing operation gracefully

line 618
[download]

The Ubuntu machine has perl 5.22 and GD version is 2.53

I've tryed to reduce the problem to the simplest one and I ended with the following:

use strict;
use warnings;

use GD;

#UPDATE: need the following line to have a real 'smooth' resampling
GD::Image->trueColor(1);

my $file = $ARGV[0];
die "Please feed a jpg file.." unless -e $file;

my $orig_gd = GD::Image->new($file);

my $photo_ratio = 0.3;

my $small_w = int($orig_gd->width  * $photo_ratio);
my $small_h = int($orig_gd->height * $photo_ratio);

draw_photo ($file);

######################################################################
+##########
sub draw_photo {
  my $file_path = shift;
  # create the resized but still empty GD image
  my $resized = GD::Image->new($small_w,$small_h);
  # copy from source into resized on
     $resized->copyResampled($orig_gd,0,0,0,0,
              $small_w,
              $small_h,
              $orig_gd->width,
              $orig_gd->height);

  # save
  open my $out, '>', time.'.jpg' or die "unable to open for write";
  binmode $out;
  print $out $resized->jpeg or die "unable to write jpg data!";
  close $out;
}
[download]

The above runs fine on my win7 machine (perl 5.14 GD 2.46) and creates a resampled image.

It also creates a resampled image on Ubuntu so it does not complains about the zeros! So i'm stucked and seek for your wisdom.

The relevant part of the original code that fails on Linux is the following:

# @files is ArrayOfArray
# each element contains pic data as follow:
# 0 path
# 1 x
# 2 y
# 3 orientation
# 4 datetime joined with underscores
# 5  GD object of THUMB
# 6  [ GD object of PHOTO]
# the last field [6] will be filled only for current file ( which inde
+x is hold in $ph_index)
# and for elelments to be preloaded: from ($ph_index - $preload)  to (
+$ph_index + $preload)
# thumb data [5] will be empty if $nothumbs is defined via -nothumbs c
+ommandline switch

######################################################################
+##########
sub draw_photo {
  my $ph_index = shift;

  print "\tdraw_photo got:\n\t",(join '|',map{defined $_ ? $_ : 'undef
+'}
      (@{$files[$ph_index]}[0..4],
        $files[$ph_index]->[5]?'THUMB':'NO DATA',
        $files[$ph_index]->[6]?'PHOTO':'NO DATA',
      )),"\n" if $debug;
  $tk_ph_image->delete if $tk_ph_image->blank;

  # some tk stuff removed  

  my $small_w = int($files[$ph_index]->[1] * $ph_ratio);
  my $small_h = int($files[$ph_index]->[2] * $ph_ratio);

  # create the resized but still empty GD image
  my $resized = GD::Image->new($small_w,$small_h);
  # copy from source into resized on
  # NOTE $files[$ph_index]->[6] containf the GD object 
     $resized->copyResampled($files[$ph_index]->[6],0,0,0,0,
              $small_w,
              $small_h,
              $files[$ph_index]->[6]->width,
              $files[$ph_index]->[6]->height);

  $tk_ph_image->configure( -file => undef,
                           -data => MIME::Base64::encode($resized->jpe
+g())
  );
  # configure the Tk::Label to use the Tk::Photo as image
  $photo_label->configure(-image => $tk_ph_image );
  
  # some display and tk stuff removed
}
######################################################################
+##########
[download]

Thanks for your patience

L*