; FU_artist_pastel.scm 
; version 2.9 [gimphelp.org]
; last modified/tested by Paul Sherman
; 02/15/2014 on GIMP-2.8.10
;
; 02/15/2014 - work with non-rgb, merge option and install info added
;==============================================================
;
; Installation:
; This script should be placed in the user or system-wide script folder. 
;
;   Windows 10
;   C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;   or
;   C:\Users\YOUR-NAME\.gimp-2.10\scripts
;   
;    
;	Linux
;	/home/yourname/.gimp-2.8/scripts  
;	or
;	Linux system-wide
;	/usr/share/gimp/2.0/scripts
;
;==============================================================
;
; LICENSE
;
;    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 <http://www.gnu.org/licenses/>.
;
;==============================================================
; Original information 
; Pastel image script  for GIMP 1.2
; Copyright (C) 2001 Iccii <iccii@hotmail.com>
; 
; This script is based on pastel-windows100.scm
; version 0.1  by Iccii 2001/10/19 <iccii@hotmail.com>
;     - Initial relase
; 
; Reference Book: Windows100% Magazine October, 2001
; Tamagorou's Photograph touching up class No.29
; theme 1 -- Create the Pastel image
;==============================================================

(define (FU-artist-pastel
    img      
    drawable        
    Dbord           
    detail          
    lengthIn
    amount
    angle
    canvas?
    inMerge
    )
    
    (gimp-image-undo-group-start img)
    (if (not (= RGB (car (gimp-image-base-type img))))
            (gimp-image-convert-rgb img))
            
  (let*  (
            (Dbordx  (cond ((= Dbord 0) 4) ((= Dbord 1) 0) ((= Dbord 2) 1) ((= Dbord 3) 2) ((= Dbord 4) 3) ((= Dbord 5) 5)  ))
            (old-selection (car (gimp-selection-save img)))
            (layer-copy0 (car (gimp-layer-copy drawable TRUE)))
            (dummy (if (< 0 (car (gimp-layer-get-mask layer-copy0)))
                (gimp-layer-remove-mask layer-copy0 MASK-DISCARD)))
            (layer-copy1 (car (gimp-layer-copy layer-copy0 TRUE)))
            (lengthUse (if (= lengthIn 1) 0 lengthIn))
            (layer-copy2 (car (gimp-layer-copy layer-copy0 TRUE)))
            (merged-layer (car (gimp-layer-copy drawable TRUE)))
            (final-layer  (car (gimp-layer-copy drawable TRUE)))
        )
        
    (gimp-image-insert-layer img layer-copy0 0 -1)
    (gimp-image-insert-layer img layer-copy2 0 -1)
    (gimp-image-insert-layer img layer-copy1 0 -1)
    
    (plug-in-mblur TRUE img layer-copy0 0 lengthUse angle TRUE TRUE);
    (plug-in-mblur TRUE img layer-copy0 0 lengthUse (+ angle 180) TRUE TRUE)
    
    (plug-in-gauss-iir TRUE img layer-copy1 (- 16 detail) TRUE TRUE)
    (plug-in-edge TRUE img layer-copy1 6.0 0 Dbord)  
    (gimp-layer-set-mode layer-copy1 LAYER-MODE-DIVIDE)
    (set! merged-layer (car (gimp-image-merge-down img layer-copy1 EXPAND-AS-NECESSARY)))
    (gimp-layer-set-mode merged-layer LAYER-MODE-HSV-VALUE-LEGACY)
    
    (if (equal? canvas? TRUE)
        (plug-in-apply-canvas TRUE img merged-layer 0 5)
    )
    (plug-in-unsharp-mask TRUE img layer-copy0 (+ 1 (/ lengthUse 5)) amount 0)
    (set! final-layer (car (gimp-image-merge-down img merged-layer EXPAND-AS-NECESSARY)))
    
    (gimp-image-select-item img CHANNEL-OP-REPLACE old-selection)
    (gimp-edit-copy final-layer)
    (gimp-item-set-name final-layer "Pastel Layer")
    
    (gimp-image-select-item img CHANNEL-OP-REPLACE old-selection)
    (gimp-image-remove-channel img old-selection)
    
    (if (= inMerge TRUE)
        (gimp-image-merge-visible-layers img EXPAND-AS-NECESSARY)
    )
    (gimp-image-undo-group-end img)
    (gimp-displays-flush)
  )
)

(script-fu-register "FU-artist-pastel"
    "<Image>/Script-Fu/Artist/Pastel"
    "Create a Pastel image. \nfile:FU_artist_pastel.scm"
    "Iccii <iccii@hotmail.com>"
    "Iccii"
    "2001, Oct"
    "*"
    SF-IMAGE      "Image"                               0
    SF-DRAWABLE   "Drawable"                            0
    SF-OPTION     "Edge detection"                      '("Differential" "Sobel" "Prewitt" "Gradient" "Roberts" "Laplace")
    SF-ADJUSTMENT "Detail Level"                        '(12.0 0 15.0 0.1 0.5 1 1)
    SF-ADJUSTMENT "Sketch Length"                       '(5 0 32 1 1 0 1)
    SF-ADJUSTMENT "Sketch Amount"                       '(2.0 0 5.0 0.1 0.5 1 1)
    SF-ADJUSTMENT "Angle"                               '(45 0 180 1 15 0 0)
    SF-TOGGLE     "Add a canvas texture"                FALSE
    SF-TOGGLE     "Merge layers when complete?"         FALSE
)

; end of script