; The GIMP -- an image manipulation program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
; 
; Selection-to-brush 
; Copyright (c) 1997 Adrian Likins
; aklikins@eos.ncsu.edu
;
; Takes the current selection, saves it as a brush, and makes it the
; active brush..
;
;       Parts of this script from Sven Neuman's Drop-Shadow and 
;       Seth Burgess's mkbrush scripts.
;
; 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.


(define (script-fu-selection-to-brush image
                                      drawable
                                      desc
                                      filename
                                      spacing)
  (let* ((type (car (gimp-drawable-type-with-alpha drawable)))
	 (old-bg (car (gimp-palette-get-background))))
  
    (set! selection-bounds (gimp-selection-bounds image))
    (set! select-offset-x  (cadr selection-bounds))
    (set! select-offset-y  (caddr selection-bounds))
    (set! selection-width  (- (cadr (cddr selection-bounds))  select-offset-x))
    (set! selection-height (- (caddr (cddr selection-bounds)) select-offset-y))

    (gimp-image-undo-disable image)
    
    (if (= (car (gimp-selection-is-empty image)) TRUE)
	(begin
	  (gimp-selection-layer-alpha drawable)
	  (set! from-selection FALSE))
	(begin
	  (set! from-selection TRUE)
	  (set! active-selection (car (gimp-selection-save image)))))

    (gimp-edit-copy drawable)

    (set! brush_draw_type
          (if (= type GRAYA-IMAGE)
              GRAY-IMAGE
              RGBA-IMAGE))

    (set! brush_image_type
          (if (= type GRAYA-IMAGE)
              GRAY
              RGB))

    (set! brush-image (car (gimp-image-new selection-width
                                           selection-height
                                           brush_image_type)))

    (set! brush-draw
          (car (gimp-layer-new brush-image
                               selection-width
                               selection-height
                               brush_draw_type
                               "Brush"
                               100
                               NORMAL-MODE)))

    (gimp-image-add-layer brush-image brush-draw 0)

    (gimp-selection-none brush-image)

    (if (= type GRAYA-IMAGE)
        (begin 
          (gimp-palette-set-background '(255 255 255))
          (gimp-drawable-fill brush-draw BACKGROUND-FILL))
        (gimp-drawable-fill brush-draw TRANSPARENT-FILL))

    (let ((floating-sel (car (gimp-edit-paste brush-draw FALSE))))
      (gimp-floating-sel-anchor floating-sel))

    (set! data-dir (car (gimp-gimprc-query "gimp_dir")))
    (set! filename2 (string-append data-dir
				   "/brushes/"
				   filename
				   (number->string image)
				   ".gbr"))

    (file-gbr-save 1 brush-image brush-draw filename2 "" spacing desc)
    (gimp-brushes-refresh)
    (gimp-brushes-set-brush desc)

    (if (= from-selection TRUE)
	(begin
	  (gimp-selection-load active-selection)
	  (gimp-image-remove-channel image active-selection)))

    (gimp-palette-set-background old-bg)

    (gimp-image-undo-enable image)
    (gimp-image-set-active-layer image drawable)
    (gimp-image-delete brush-image)
    (gimp-displays-flush)))

(script-fu-register "script-fu-selection-to-brush"
		    _"<Image>/Script-Fu/Selection/To _Brush..."
		    "Convert a selection to a brush"
		    "Adrian Likins <adrian@gimp.org>"
		    "Adrian Likins"
		    "10/07/97"
		    "RGB* GRAY*"
		    SF-IMAGE       "Image"       0
		    SF-DRAWABLE    "Drawable"    0
		    SF-STRING     _"Brush Name"  "My Brush"
		    SF-STRING     _"Filename"    "mybrush"
		    SF-ADJUSTMENT _"Spacing"     '(25 0 1000 1 1 1 0))
