Changeset 3137 for trunk/gsdl

Timestamp:

2002-06-07T12:32:11+12:00 (22 years ago)

Author:

paynter

Message:

Changed the way Width, Height, Size and Type metadata is calculated.
Previously, we trapped the STDERR output of convert, which included
this stuff, and parsed it with a complex regexp. The problem is the
format of this output keeps changing. This version stops trying to do
that, and uses the ImageMajick "identify" program instead. It's
slower but more reliable. (That said, I've not tested it on non-Linux
platforms.)

File:

• trunk/gsdl/perllib/plugins/ImagePlug.pm (modified) (8 diffs)

trunk/gsdl/perllib/plugins/ImagePlug.pm

@@ -58 +58 @@
 "
 }
+
 
 sub new {
@@ -84 +85 @@
 }
 
+
 sub get_default_process_exp {
     my $self = shift (@_);
@@ -118 +120 @@
     }
 
-
     # Convert the image to a new type (if required).
     my $converttotype = $self->{'converttotype'};
@@ -139 +140 @@
     }
     
+    # Add the image metadata
+    $doc_obj->add_metadata ($section, "Image", "$file");
+    my ($image_type, $image_width, $image_height, $image_size) 
+    = &identify($filename, $outhandle, $verbosity);
+
+    $doc_obj->add_metadata ($section, "ImageType",   $image_type);
+    $doc_obj->add_metadata ($section, "ImageWidth",  $image_width);
+    $doc_obj->add_metadata ($section, "ImageHeight", $image_height);
+    $doc_obj->add_metadata ($section, "ImageSize",   $image_size);
+
+    # Add the image as an associated file
+    $doc_obj->associate_file($filename,$file,"image/$type",$section);
 
     # Make the thumbnail image
-    my $thumbnailsize = $self->{'thumbnailsize'}  || 100;
+    my $thumbnailsize = $self->{'thumbnailsize'} || 100;
     my $thumbnailtype = $self->{'thumbnailtype'} || 'gif';
-    
-    my $thumbnailfilename = &util::get_tmp_filename() . ".$thumbnailtype";
-    $self->{'tmp_filename2'} = $thumbnailfilename;
+    my $thumbnailfile = &util::get_tmp_filename() . ".$thumbnailtype";
+    $self->{'tmp_filename2'} = $thumbnailfile;
 
     # Generate the thumbnail with convert
     my $command = "convert -verbose -geometry $thumbnailsize" 
-    . "x$thumbnailsize $filename $thumbnailfilename";
+    . "x$thumbnailsize $filename $thumbnailfile";
     print $outhandle "$command\n" if ($verbosity > 2);
     my $result = '';
@@ -156 +168 @@
 
     # Add the thumbnail as an associated file ...
-    if (-e "$thumbnailfilename") { 
-    $doc_obj->associate_file("$thumbnailfilename", "thumbnail.$thumbnailtype", 
+    if (-e "$thumbnailfile") { 
+    $doc_obj->associate_file("$thumbnailfile", "thumbnail.$thumbnailtype", 
                  "image/$thumbnailtype",$section);
     $doc_obj->add_metadata ($section, "ThumbType", $thumbnailtype);
@@ -163 +175 @@
     }
 
-
-    # Extract Image metadata from convert output
-    if ($result =~ m/([0-9]+)x([0-9]+)=>([0-9]+)x([0-9]+)/) {
-    $doc_obj->add_metadata ($section, "ImageWidth", $1);
-    $doc_obj->add_metadata ($section, "ImageHeight", $2);
-    $doc_obj->add_metadata ($section, "ThumbWidth", $3);
-    $doc_obj->add_metadata ($section, "ThumbHeight", $4);
-    }
-    
-    my $size = "unknown";
-    if ($result =~ m/^[^\n]* ([0-9]+)b/) {
-    $size = $1;
-    } elsif ($result =~ m/^[^\n]* ([0-9]+)kb/) {
-    $size = 1024 * $1;
-    }
-    
-    if ($result =~ m/^[^\n]*JPE?G/i) {
-    $type = "jpeg";
-    } elsif ($result =~ m/^[^\n]*GIF/i) {
-    $type = "gif";
-    } elsif ($result =~ m/^[^\n]*PNG/i) {
-    $type = "png";
-    } elsif ($result =~ m/^[^\n]*TIF?F/i) {
-    $type = "tiff";
-    } elsif ($result =~ m/^[^\n]*BMP/i) {
-    $type = "bmp";
-    } elsif ($result =~ m/^[^\n]*XBM?F/i) {
-    $type = "xbm";
-    }
-
-    $doc_obj->add_metadata ($section, "ImageType", $type);
-    $doc_obj->add_metadata ($section, "Image", "$file");
-    $doc_obj->add_metadata ($section, "ImageSize", $size);
-    
-    # Add the image as an associated file ...
-    $doc_obj->associate_file($filename,$file,"image/$type",$section);
-        
+    # Extract Thumnail metadata from convert output
+    if ($result =~ m/[0-9]+x[0-9]+=>([0-9]+)x([0-9]+)/) {
+    $doc_obj->add_metadata ($section, "ThumbWidth", $1);
+    $doc_obj->add_metadata ($section, "ThumbHeight", $2);
+    }
 
     # Make a screen-sized version of the picture if requested
     if ($self->{'screenviewsize'}) {
+
+    # To do: if the actual image smaller than the screenview size,
+    # we should use the original !
 
     my $screenviewsize = $self->{'screenviewsize'};
@@ -235 +218 @@
 
     return $type;
-
-
+}
+
+
+# Discover the characteristics of an image file with the ImageMagick
+# "identify" command.
+
+sub identify { 
+    my ($image, $outhandle, $verbosity) = @_;
+
+    # Use the ImageMagick "identify" command to get the file specs
+    my $command = "identify $image 2>&1";
+    print $outhandle "$command\n" if ($verbosity > 2);
+    my $result = '';
+    $result = `$command`;
+    print $outhandle "$result\n" if ($verbosity > 3);
+
+    # Read the type, width, and height
+    my $type =   'unknown';
+    my $width =  'unknown';
+    my $height = 'unknown';
+
+    if ($result =~ /^$image (\w+) (\d+)x(\d+)/) {
+    $type = $1;
+    $width = $2;
+    $height = $3;
+    }
+    
+    # Read the size
+    my $size = "unknown";
+    if ($result =~ m/^.* ([0-9]+)b/) {
+    $size = $1;
+    } elsif ($result =~ m/^.* ([0-9]+)kb/) {
+    $size = 1024 * $1;
+    }
+
+    print $outhandle "file: $image:\t $type, $width, $height, $size\n" 
+    if ($verbosity > 2);
+
+    # Return the specs
+    return ($type, $width, $height, $size);
 }
 
@@ -334 +355 @@
 
 1;
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