; 210_sharpness-softer_sharp-blur.scm
; last modified/tested by Paul Sherman [gimphelp.org]
; Wednesday, 07/15/2020 on GIMP 2.10.20
;==================================================
;
; Installation:
; This script should be placed in the user or system-wide script folder.
;
;	Windows 7/10
;	C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;	or
;	C:\Users\YOUR-NAME\AppData\Roaming\GIMP\2.10\scripts
;	
;    
;	Linux
;	/home/yourname/.config/GIMP/2.10/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 
; 
; Script by Mark Probst
;==============================================================
(define (210-sharp-blur 
		img 
		drw 
		image-blur-radius 
		edge-blur-radius 
		edge-detect-amount 
		edge-gamma-correction
		inMerge
		)
  (let* ((drawable-width (car (gimp-drawable-width drw)))
	 (drawable-height (car (gimp-drawable-height drw)))
	 (image (car (gimp-image-new drawable-width drawable-height RGB)))
	 (drawable (car (gimp-layer-new image drawable-width drawable-height RGB-IMAGE "Original" 100 LAYER-MODE-NORMAL-LEGACY))))
    (gimp-image-undo-disable image)
    (gimp-image-insert-layer image drawable 0 0)
    (gimp-selection-all img)
    (gimp-edit-copy drw)
    (gimp-floating-sel-anchor (car (gimp-edit-paste drawable FALSE)))
    (let* ((overlay-layer (car (gimp-layer-copy drawable TRUE)))
	   (mask-layer (car (gimp-layer-copy drawable TRUE))))
      (gimp-image-insert-layer image overlay-layer 0 0)
      (gimp-image-insert-layer image mask-layer 0 0)
      (if (> edge-blur-radius 0)
	  (plug-in-gauss-iir TRUE img mask-layer edge-blur-radius TRUE TRUE))
      (plug-in-edge 1 img mask-layer edge-detect-amount 1 0)
      (let* ((mask-channel (car (gimp-layer-create-mask overlay-layer 0))))
	(gimp-layer-add-mask overlay-layer mask-channel)
	(gimp-edit-copy mask-layer)
	(gimp-layer-set-opacity overlay-layer 70.0)
	(gimp-floating-sel-anchor (car (gimp-edit-paste mask-channel FALSE)))
	(gimp-image-remove-layer image mask-layer)
	(plug-in-gauss-iir TRUE image drawable image-blur-radius TRUE TRUE)
	(gimp-levels mask-channel 0 0 255 edge-gamma-correction 0 255)
	(if (= inMerge TRUE)(gimp-image-merge-visible-layers image EXPAND-AS-NECESSARY))
	(gimp-image-undo-enable image)
	(gimp-display-new image)
	(gimp-displays-flush)))))
(script-fu-register
 "210-sharp-blur"
 "Sharp Blur"
 "Blur image but retain edges."
 "Mark Probst (schani@complang.tuwien.ac.at)"
 "Mark Probst"
 "2004/08/24"
 "*"
 SF-IMAGE 		"Image" 						0
 SF-DRAWABLE 	"Drawable" 						0
 SF-ADJUSTMENT 	"Image blur radius" 			'(8 0 100 1 10 0 1)
 SF-ADJUSTMENT 	"Edge blur radius" 				'(4 0 100 1 10 0 1)
 SF-ADJUSTMENT 	"Edge detect amount" 			'(4 0 50 1 5 0 1)
 SF-ADJUSTMENT 	"Edge gamma correction" 		'(2 0 10 1 2 0 1)
 SF-TOGGLE     	"Merge layers when complete?" 	FALSE
)
(script-fu-menu-register "210-sharp-blur" "<Image>/Script-Fu/Sharpness/Softer")