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+; GIMP - The GNU Image Manipulation Program
+; Copyright (C) 1995 Spencer Kimball and Peter Mattis
+;
+; Predator effect
+; Copyright (c) 1997 Adrian Likins
+; aklikins@eos.ncsu.ed
+;
+; The idea here is too make the image/selection look sort of like
+; the view the predator had in the movies. ie, kind of a thermogram
+; type of thing. Works best on colorful rgb images.
+;
+; This program is free software: you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation; either version 3 of the License, or
+; (at your option) any later version.
+;
+; This program is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+; GNU General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+
+(define (script-fu-predator image
+ drawable
+ edge-amount
+ pixelize
+ pixel-size
+ keep-selection
+ separate-layer)
+ (let* (
+ (type (car (gimp-drawable-type-with-alpha drawable)))
+ (image-width (car (gimp-image-width image)))
+ (image-height (car (gimp-image-height image)))
+ (active-selection 0)
+ (from-selection 0)
+ (selection-bounds 0)
+ (select-offset-x 0)
+ (select-offset-y 0)
+ (select-width 0)
+ (select-height 0)
+ (effect-layer 0)
+ (active-layer 0)
+ )
+
+ (gimp-context-push)
+ (gimp-context-set-defaults)
+ (gimp-image-undo-group-start image)
+ (gimp-layer-add-alpha drawable)
+
+ (if (= (car (gimp-selection-is-empty image)) TRUE)
+ (begin
+ (gimp-image-select-item image CHANNEL-OP-REPLACE drawable)
+ (set! active-selection (car (gimp-selection-save image)))
+ (set! from-selection FALSE)
+ )
+ (begin
+ (set! from-selection TRUE)
+ (set! active-selection (car (gimp-selection-save image)))
+ )
+ )
+
+ (set! selection-bounds (gimp-selection-bounds image))
+ (set! select-offset-x (cadr selection-bounds))
+ (set! select-offset-y (caddr selection-bounds))
+ (set! select-width (- (cadr (cddr selection-bounds)) select-offset-x))
+ (set! select-height (- (caddr (cddr selection-bounds)) select-offset-y))
+
+ (if (= separate-layer TRUE)
+ (begin
+ (set! effect-layer (car (gimp-layer-new image
+ select-width
+ select-height
+ type
+ "glow layer"
+ 100
+ LAYER-MODE-NORMAL))
+ )
+
+ (gimp-layer-set-offsets effect-layer select-offset-x select-offset-y)
+ (gimp-image-insert-layer image effect-layer 0 -1)
+ (gimp-selection-none image)
+ (gimp-drawable-edit-clear effect-layer)
+
+ (gimp-image-select-item image CHANNEL-OP-REPLACE active-selection)
+ (gimp-edit-copy drawable)
+ (let ((floating-sel (car (gimp-edit-paste effect-layer FALSE))))
+ (gimp-floating-sel-anchor floating-sel)
+ )
+ (gimp-image-set-active-layer image effect-layer)
+ )
+ (set! effect-layer drawable)
+ )
+ (set! active-layer effect-layer)
+
+ ; all the fun stuff goes here
+ (if (= pixelize TRUE)
+ (plug-in-pixelize RUN-NONINTERACTIVE image active-layer pixel-size)
+ )
+ (plug-in-max-rgb RUN-NONINTERACTIVE image active-layer 0)
+ (plug-in-edge RUN-NONINTERACTIVE image active-layer edge-amount 1 0)
+
+ ; clean up the selection copy
+ (gimp-image-select-item image CHANNEL-OP-REPLACE active-selection)
+
+ (if (= keep-selection FALSE)
+ (gimp-selection-none image)
+ )
+
+ (gimp-image-set-active-layer image drawable)
+ (gimp-image-remove-channel image active-selection)
+ (gimp-image-undo-group-end image)
+ (gimp-displays-flush)
+ (gimp-context-pop)
+ )
+)
+
+(script-fu-register "script-fu-predator"
+ _"_Predator..."
+ _"Add a 'Predator' effect to the selected region (or alpha)"
+ "Adrian Likins <adrian@gimp.org>"
+ "Adrian Likins"
+ "10/12/97"
+ "RGB*"
+ SF-IMAGE "Image" 0
+ SF-DRAWABLE "Drawable" 0
+ SF-ADJUSTMENT _"Edge amount" '(2 0 24 1 1 0 0)
+ SF-TOGGLE _"Pixelize" TRUE
+ SF-ADJUSTMENT _"Pixel amount" '(3 1 16 1 1 0 0)
+ SF-TOGGLE _"Keep selection" TRUE
+ SF-TOGGLE _"Separate layer" TRUE
+)
+
+(script-fu-menu-register "script-fu-predator"
+ "<Image>/Filters/Artistic")