NAME
Gimp::OO - Pseudo-OO for Gimp functions.
SYNOPSIS
use Gimp; # Gimp::OO is now part of Gimp.DESCRIPTION
As you might have noticed, you can sort most gimp functions fall into three groups, depending on the name-prefix: gimp_, plug_in_, extension_ etc..
Whats more, there are functions groups like gimp_image_ or gimp_selection_, operating on a common object, Images and Selection in this case.
If you only had the plain syntax, your scripts would quickly aquire the "vertical gimp syndrome":
gimp_palette_set_foreground(...)
gimp_layer_new(...)
gimp_palette_set_background(...)
gimp_image_add_layer(...)etc. Of course, your fingers will suffer from severe injuries as well.
A solution to this situation is to use OO-syntax. Gimp plays some (very) dirty tricks and provides a number of classes, like Gimp::Image and Gimp::Palette that allow shorter identifiers to be used (all these appear with the Gimp:: prefix as well as without, i.e. Gimp::Palette is the same class as Palette).
If you call a method, Gimp tries to find a gimp function by prepending a number of prefixes until it finds a valid function:
$image = Gimp->image_new(...); # calls gimp_image_new(...)
$image = Image->new(...); # calls gimp_image_new as well
$image = new Image(...); # the same in green
Palette->set_foreground(...) # calls gimp_palette_set_foreground(..)Return values from functions are automatically blessed (through The Magic Autobless feature ;) to their corresponding classes, i.e.
$image = new Image(...); # $image is now blessed to Gimp::Image
$image->height; # calls gimp_image_height($image)
$image->flatten; # likewise gimp_flatten($image)
$image->histogram(...); # calls gimp_histogram($image,...), since
# gimp_image_histogram does not existThe class argument ($image in the above examples) is prepended to the argument list.
Another shortcut: many functions want a (redundant) image argument, like
$image->shear ($layer, ...)Since all you want is to shear the $layer, not the $image, this is confusing as well. In cases like this, Gimp allows you to write:
$layer->shear (...)And automatically infers the additional IMAGE-type argument.
As the (currently) last goodie, if the first argument is of type INT32, its name is "run_mode" and there are no other ambiguties, you can omit it, i.e. these three calls are equivalent:
plug_in_gauss_rle (RUN_NONINTERACTIVE, $image, $layer, 8, 1, 1);
plug_in_gauss_rle ($image, $layer, 8, 1, 1);
plug_in_gauss_rle ($layer, 8, 1, 1);You can call all sorts of sensible and not-so-sensible functions, so this feature can be abused:
patterns_list Image; # will call gimp_patterns_list
quit Plugin; # will quit the Gimp, not an Plugin.there is no image involved here whatsoever...
AVAILABLE CLASSES
The following classes (with and without Gimp::) are available. The prefixes that are checked are shown as well (the null prefix "" is implicit).
- Gimp (there is no Gimp::Gimp, only Gimp::)
-
gimp_ - Layer
-
gimp_layer_ gimp_drawable_ gimp_floating_sel_ gimp_image_ gimp_ plug_in_ - Image
-
gimp_image_ gimp_drawable_ gimp_ plug_in_ - Drawable
-
gimp_drawable_ gimp_layer_ gimp_image_ gimp_ plug_in_ - Selection
-
gimp_selection_ - Channel
-
gimp_channel_ gimp_drawable_ gimp_selection_ gimp_image_ gimp_ plug_in_ - Display
-
gimp_display_ gimp_ - Palette
-
gimp_palette_ - Plugin
-
plug_in_ - Gradients
-
gimp_gradients_ - Edit
-
gimp_edit_ - Progress
-
gimp_progress_ - Region
-
(none except the implicit null prefix)
- Tile
-
gimp_tile_ - PixelRgn
-
gimp_pixel_rgn_ - GDrawable
-
gimp_gdrawable_ - Brushes
-
gimp_brushes_ - Edit
-
gimp_edit_ - Gradients
-
gimp_gradients_ - Selection
-
gimp_selection_ - Patterns
-
gimp_patterns_ - Parasite
-
parasite_ gimp_
AUTHOR
Marc Lehmann <pcg@goof.com>
SEE ALSO
perl(1), Gimp.