; The GIMP -- an image manipulation program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
; 
; Glow
; Copyright (c) 1997 Adrian Likins
; aklikins@eos.ncsu.ed
;
;  Makes a "glow" around the outside of the current selection.
;
; 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 2 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, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;
; Changed on June 15, 2000 by Kevin Cozens <kcozens@interlog.com>
; Updated for GIMP 1.1.26
;
; Changed on January 29, 2004 by Kevin Cozens <kcozens@interlog.com>
; Updated for GIMP 2.0pre3


(define (script-fu-glow image
			drawable
			glow-radius
			feather-radius
			glow-color
			glow-opacity
			keep-selection
			seperate-layer)
  (let* (
	 (type (car (gimp-drawable-type-with-alpha drawable)))
	 (old-gradient (car (gimp-gradients-get-gradient)))
	 (old-fg (car (gimp-palette-get-foreground)))
	 (old-bg (car (gimp-palette-get-background))))
    
    (gimp-image-undo-disable image)
    (gimp-layer-add-alpha drawable)
    
    (if (= (car (gimp-selection-is-empty image)) TRUE)
	(begin
	  (gimp-selection-layer-alpha 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))
    (set! buffer (+ (* glow-radius 2) (* feather-radius 2) 2))
    (set! select-height (+ select-height buffer))
    (set! select-width (+ select-width buffer))
    (set! select-offset-x (- select-offset-x (/ buffer 2)))
    (set! select-offset-y (- select-offset-y (/ buffer 2)))
    
    (if (= seperate-layer TRUE)
	(begin
	  (set! effect-layer (car (gimp-layer-new image
						  select-width
						  select-height
						  type
						  "glow layer"
						  100
						  NORMAL-MODE)))
	  (gimp-layer-set-offsets effect-layer select-offset-x select-offset-y)
	  (gimp-image-add-layer image effect-layer -1)
	  (gimp-selection-none image)
	  (gimp-edit-clear effect-layer)
	  (gimp-selection-load active-selection)
	  (gimp-image-set-active-layer image effect-layer ))
	(begin
	  (gimp-edit-copy drawable)))
    (set! active-layer (car (gimp-image-get-active-layer image)))

    (gimp-selection-grow image glow-radius)
    (gimp-selection-feather image feather-radius)
    (gimp-palette-set-background glow-color)
    (gimp-edit-fill active-layer BACKGROUND-FILL)
    
    (if (= seperate-layer TRUE)
	(begin
	  (gimp-selection-load active-selection)
	  (gimp-edit-clear active-layer)
	  (gimp-layer-set-opacity active-layer glow-opacity))
	(begin
	  (gimp-selection-load active-selection)
	  (let ((floating-sel (car (gimp-edit-paste active-layer FALSE))))
	      (gimp-floating-sel-anchor floating-sel))
	  (gimp-selection-load active-selection)))
    
    (gimp-gradients-set-gradient old-gradient)
    (gimp-palette-set-background old-bg)
    (gimp-palette-set-foreground old-fg)
    
    (if (= keep-selection FALSE)
	(gimp-selection-none image))
    
    (gimp-image-undo-enable image)
    (gimp-image-set-active-layer image drawable)
    (gimp-image-remove-channel image active-selection)
    (gimp-displays-flush)))

(script-fu-register "script-fu-glow"
		    "<Image>/Script-Fu/Decor/Glow"
		    "Makes a \"glow\" around the outside of the current selection."
		    "Adrian Likins <adrian@gimp.org>"
		    "Adrian Likins"
		    "10/12/97"
		    "RGB RGBA GRAY GRAYA"
		    SF-IMAGE "Image" 0
		    SF-DRAWABLE "Drawable" 0
		    SF-VALUE "Glow Radius" "2"
		    SF-VALUE "Feather Radius" "10"
		    SF-COLOR "Glow Color" '(255 255 255)
		    SF-VALUE "Glow Opacity (only for seperate layer)" "100"
		    SF-TOGGLE "Keep Selection?" TRUE
		    SF-TOGGLE "Seperate Layer?" TRUE)