#!/usr/bin/perl

#######################################################################
# LiVES rotate plugin v0.1

# rendered plugins should accept:
# <plugin_name> version (return <plugin_name> version <version>)
# <plugin_name> get_capabilities
# <plugin_name> get_description (e.g. "Edge detect|Edge detecting|1|1|")
# 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


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

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 )
    # 0x8000 == reserved
    print "32770\n";
    exit 0;
}

if ($command eq "version") {
    print "rotate version 1.0 : builder version 0.9.5\n";
    exit 0;
}

if ($command eq "get_description") {
    #format here is "Menu entry|Action description|min_frames|script_file_name|"
    # 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 "Rotate Clip|Rotating|1|1||\n";
    exit 0;
}


if ($command eq "get_parameters") {
    # "name|group|type|default|min|max|"
    # eg. print "Radius|0|num0|1|1|100|";
    # types can be numx,colRGB24,bool,string or string_list
    print "90 degrees _Clockwise    |1|bool|1|\n";
    print "90 degrees _Anticlockwise|1|bool|0|\n";
    print "180 _degrees             |1|bool|0|\n";
    print "_Other degrees|1|num0|0|-180|180|\n";
    print "_Shrink rotated window to fit frame size|0|bool|0|\n";
    exit 0;
}

if ($command eq "get_param_window") {
    print "layout|p1||\n";
    print "layout|p2||\n";
    print "layout|p3||\n";
    print "layout|p4||\n";
    print "layout|hseparator||\n";
    print "layout|p5||\n";
    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) ]

    $livesexitcode=1;
    $SIG{'HUP'}="dopost";

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

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

    unless (defined($ARGV[1])) {
      $p1=1;
    }
    else {
      $p1=$ARGV[1];
    }
    unless (defined($ARGV[2])) {
      $p2=0;
    }
    else {
      $p2=$ARGV[2];
    }
    unless (defined($ARGV[3])) {
      $p3=0;
    }
    else {
      $p3=$ARGV[3];
    }
    unless (defined($ARGV[4])) {
      $p4=0;
    }
    else {
      $p4=$ARGV[4];
    }
    unless (defined($ARGV[5])) {
      $p5=0;
    }
    else {
      $p5=$ARGV[5];
    }
    $p1=~(~$p1);
    $p2=~(~$p2);
    $p3=~(~$p3);
    $p4=int($p4*1+.5)/1;
    if ($p4<-180) {
       &sig_error("_Other degrees must be >= -180");
    }
    if ($p4>180) {
       &sig_error("_Other degrees must be <= 180");
    }
    $p5=~(~$p5);

    $bgcolour=&rc_get("bgcolour");
    $antialias="false";
    
    # this is for resize_frame
    $resize=0;
    $resize_ext=$input_ext=$out_ext;
    if ($p1) {
        $deg=90;
        if (!$p5) {
            $nheight=$width;
            $nwidth=$height;
        }
    }
    elsif ($p2) {
        $deg=-90;
        if (!$p5) {
            $nheight=$width;
            $nwidth=$height;
        }
    }
    elsif ($p3) {
        $deg=180;
    }
    else {
        $deg=$p4;
    }

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

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

        system ("$convert_command -background \"$bgcolour\" $in -rotate $deg $out");
        if ($p5==1) {
            &resize_frame($name,$nwidth,$nheight);
        }
        else {
            &trim_center($name,$nwidth,$nheight);
        }
        

###################################################################
        if (! -f $out) {
            print "Warning: effect plugin rotate skipped frame $frame !";
            `cp $in $out`;
        }
    }
    $livesexitcode=0;
    &dopost;
    return 1;
}



########## Post loop code ############
sub dopost {
    if ($livesexitcode) {
        exit $livesexitcode;
    }
}
