in reply to Re^2: Tk photo display: memory never released
in thread Tk photo display: memory never released

thanks Anonymous Monk,

so the only way to efficiently load into a Tk::Photo object it is giving to it a filename to read ?

What I can do if i want to manipulate the image before displaying it? I've used in the original program GD and Image::Resize to handle rotation, for example, but this implies that i'll later pass the photo's data as MIME::Base64 encoded string into the -data => part of the Tk::Photo configure.

Thanks for your help

L*

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

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Re^4: Tk photo display: memory never released
by Anonymous Monk on Jul 04, 2016 at 21:31 UTC
    Temporary files? You'll have to try both/all and see what happens :)
[reply]
      thanks for the suggestion but temporary files... no!

      but i'm very near to acceptable solution: 

      # global dummy photo
my $image = $phwin->Photo(-file => '' ) or die $!;

...

######################################################################
+##########
sub next_pic {
   my $pic_file = shift @files;
   print "processing [$pic_file]\n";

#It's necessary to use the "delete" method to delete an image object 
#and free memory associated with it. Just using a lexical variable for
#storing the image object and letting the variable to go out of scope 
#or setting to undef is not sufficient.
# http://search.cpan.org/~srezic/Tk-804.033/pod/Image.pod

   $image->delete if $image->blank;

   my  $gd_image = GD::Image->new($pic_file);
   my $small_w = int($gd_image->width * 0.2);
   my $small_h = int($gd_image->height * 0.2);

   my $resized = GD::Image->new($small_w,$small_h);
      $resized->copyResized($gd_image,0,0,0,0,
              $small_w,
              $small_h,
              $gd_image->width,
              $gd_image->height);


   $image->configure(-file => undef, -data => MIME::Base64::encode($re
+sized->jpeg()));
   
   $photo_label->configure(-image => $image );
   
   # system 'tasklist | grep perl'; # monitoring memory
}

      [download]

      The above is not leaking memory at the moment

      L*

      There are no rules, there are no thumbs..
      Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
[reply]
[d/l]

      FWIW, through use Tcl::pTk::TkHijack; both versions leak, this  $image = $phwin->Photo(-file => $pic_file ); and this  $image->read($pic_file, -shrink  );

      This under 

      tcl_version      8.6
tcl_patchLevel   8.6b1.2
tk_version       8.6
tk_patchLevel    8.6b1.2
tk_library       C:/Tcl8.6/lib/tk8.6

Tcl::pTk 0.90
Tcl 1.02
$^V v5.16.1
$] 5.016001

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