#!/usr/bin/perl

#######################################################################
# LiVES gamma_change plugin, version 1.7
# RFX version 1.8
# autogenerated from script by Salsaman & Marco|

# rendered plugins should accept:
# <plugin_name> version (return <plugin_name> version <version>)
# <plugin_name> get_define
# <plugin_name> get_capabilities
# <plugin_name> get_description (e.g. "Edge detect|Edge detecting|1|1|")
# <plugin_name> clear (clean up any plugin generated temp files)
# and optionally any of: 
# <plugin_name> get_parameters
# <plugin_name> get_param_window
# <plugin_name> get_onchange
# <plugin_name> onchange_<when> (for any triggers, e.g. onchange_init)
#
# they must accept:
# <plugin_name> process <parameters>

# You should not skip any frames, if a frame is not changed you must do:
# `cp $in $out`
#
# for *non-Perl* plugins, LiVES will call:
# <plugin_name> process "<dir>" <in_ext> <out_ext> <start> <end>
#  <width> <height> <parameters>
# first you should chdir to <dir>
# then you should create all output frames %8d$out_ext in numerical 
# from start to end inclusive,
# each time calling sig_progress (see smogrify) - writes current frame number to 
# <dir>/.status
# and checking for pause
#
# Any errors should be transmitted as in sig_error - 
# write "error|msg1|msg2|msg3|" to <dir>/.status
# msgn must not contain "\n", but can be omitted

# output frames should be named %8d$out_ext in the same directory
# after processing, you should leave no gaps in out frames, you should not resize
# or change the palette from RGB24 (LiVES will check and autocorrect this soon)

# Also you must implement your own: &sig_error and &sig_progress


#######################################################################

use POSIX;

my $command=$ARGV[0];

if ($command eq "get_capabilities") {
    # capabilities is a bitmap field
    # 0x0001 == slow (hint to GUI)
    # 0x0002 == may resize (all frames to  x )
    # 0x0004 == block mode generator
    # 0x8000 == reserved
    print "32769\n";
    exit 0;
}

if ($command eq "version") {
    print "gamma_change version 1 : builder version 2.0.3\n";
    exit 0;
}

if ($command eq "get_define") {
    print "|1.7\n";
    exit 0;
}

if ($command eq "get_description") {
    #format here is "Menu entry|Action description|min_frames|number_of_in_channels|"
    # min_frames==-1 indicates a special "no processing" effect. This allows more
    #general parameter windows which are not really effects (e.g. frame_calculator)
    print "Gamma change|Changing gamma of|1|1|\n";
    exit 0;
}


if ($command eq "get_parameters") {
    # "name|label|type|other fields..."
    # eg. print "radius|_radius|num0|1|1|100|";
    # types can be numx,colRGB24,bool,string or string_list
    print "gstart|Gamma _start|num2|1.0|-10.0|10.0|\n";
    print "gend|Gamma _end|num2|1.0|-10.0|10.0|\n";
    exit 0;
}

if ($command eq "get_param_window") {
    exit 0;
}

if ($command eq "get_onchange") {
    exit 0;
}

#######################################################

if ($command eq "process") {

# in case of error, you should do:
# &sig_error("msg1","msg2","msg3","msg4"); [ msg's are optional, but must not
# contain newlines (\n) ]

##### check requirements first #######
    if (&location("convert") eq "") {
      &sig_error("You must install 'convert' before you can use this effect.");
      exit 1;
    }
    if (&location("convert") eq "") {
      &sig_error("You must install 'convert' before you can use this effect.");
      exit 1;
    }

###### handle parameters #############
# autogenerated from get_parameters

    unless (defined($ARGV[1])) {
      $p0=1.0;
    }
    else {
      $p0=$ARGV[1];
    }
    unless (defined($ARGV[2])) {
      $p1=1.0;
    }
    else {
      $p1=$ARGV[2];
    }
    $!=0;
    if ($p0>=0) {
        $p0=int(POSIX::strtod($p0)*100.+.5)/100.;
    } else {
        $p0=int(POSIX::strtod($p0)*100.-.5)/100.;
    }
    if ($p0<-10.0) {
       &sig_error("gstart must be >= -10.0");
       exit 1;
    }
    if ($p0>10.0) {
       &sig_error("gstart must be <= 10.0");
       exit 1;
    }
    $!=0;
    if ($p1>=0) {
        $p1=int(POSIX::strtod($p1)*100.+.5)/100.;
    } else {
        $p1=int(POSIX::strtod($p1)*100.-.5)/100.;
    }
    if ($p1<-10.0) {
       &sig_error("gend must be >= -10.0");
       exit 1;
    }
    if ($p1>10.0) {
       &sig_error("gend must be <= 10.0");
       exit 1;
    }

   if ($img_ext eq ".png") {
        $img_prefix="PNG32:";
   } else {
        $img_prefix="";
   }

   if ($out_ext eq ".png") {
        $out_prefix="PNG32:";
   } else {
        $out_prefix="";
   }

    $step=($p1-$p0)/($end-$start+1);

    if ($start==0) {$start = 1;}


################# loop through frames #################
   if ($img_ext eq ".png") {
        $img_prefix="PNG32:";
   } else {
        $img_prefix="";
   }

   if ($out_ext eq ".png") {
        $out_prefix="PNG32:";
   } else {
        $out_prefix="";
   }

    for ($frame=$start;$frame<=$end;$frame++) {
	# sig progress will update the progress bar from $start->$end
	$name=&mkname($frame);
	$in="$name$img_ext";

     if (!defined($end) || $end==0) {
         print STDERR "WARNING: generator plugin did not set $end !";
         &sig_error("Generator plugin did not set $end.");
     }
	$out="$name$out_ext";

# wait for front end to create 
 while (!-f $in) {
     sleep 1;
 }

##################### the all-important bit #######################

        system("$convert_command $img_prefix$in -gamma $p0 $out_prefix$out");
        $p0+=$step;

###################################################################
        $opfailed=0;
        if (! -f $out) {
            print STDERR "Warning: effect plugin gamma_change skipped frame $frame !\n";
            print STDERR "Retrying\n";
            $frame--;
            $opfailed=1;
        }
        unless ($opfailed) {
	    &sig_progress($frame);
        }
    }
    return 1;
}



########## Post loop code ############
if ($command eq "clear") {
    $start=$ARGV[1];
    $end=$ARGV[2];
    $img_ext=$ARGV[3];

    exit 0;
}
