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; Plugin for the GNU Image Manipulation Program
; Copyright (C) 2006 Martin Nordholts
;
; 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/>.
;
; Renders Difference Clouds onto a layer, i.e. solid noise merged down with the
; Difference Mode
;
(define (script-fu-difference-clouds image
drawables
seed
detail
tileable
turbulent
x_size
y_size)
(let* ((layer (vector-ref drawables 0))
(draw-offset-x (car (gimp-drawable-get-offsets layer)))
(draw-offset-y (cadr (gimp-drawable-get-offsets layer)))
(has-sel (car (gimp-drawable-mask-intersect layer)))
(sel-offset-x (cadr (gimp-drawable-mask-intersect layer)))
(sel-offset-y (caddr (gimp-drawable-mask-intersect layer)))
(width (cadddr (gimp-drawable-mask-intersect layer)))
(height (caddr (cddr (gimp-drawable-mask-intersect layer))))
(type (car (gimp-drawable-type-with-alpha layer)))
(diff-clouds -1)
(offset-x 0)
(offset-y 0)
)
(gimp-image-undo-group-start image)
; Create the cloud layer
(set! diff-clouds (car (gimp-layer-new image "Clouds" width height type
100 LAYER-MODE-DIFFERENCE)))
; Add the cloud layer above the current layer
(gimp-image-insert-layer image diff-clouds 0 -1)
; Clear the layer (so there are no noise in it)
(gimp-drawable-fill diff-clouds FILL-TRANSPARENT)
; Selections are relative to the drawable; adjust the final offset
(set! offset-x (+ draw-offset-x sel-offset-x))
(set! offset-y (+ draw-offset-y sel-offset-y))
; Offset the clouds layer
(if (gimp-item-id-is-layer layer)
(gimp-item-transform-translate diff-clouds offset-x offset-y))
; Run GEGL Solid Noise filter
(let* ((cloud-width (cadddr (gimp-drawable-mask-intersect diff-clouds)))
(cloud-height (caddr (cddr (gimp-drawable-mask-intersect diff-clouds)))))
(gimp-drawable-merge-new-filter diff-clouds "gegl:noise-solid" 0 LAYER-MODE-REPLACE 1.0 "tileable" tileable "turbulent" turbulent "seed" seed
"detail" detail "x-size" x_size "y-size" y_size
"width" cloud-width "height" cloud-height)
)
; Merge the clouds layer with the layer below
(gimp-image-merge-down image diff-clouds EXPAND-AS-NECESSARY)
(gimp-image-undo-group-end image)
(gimp-displays-flush)
)
)
(script-fu-register-filter "script-fu-difference-clouds"
_"_Difference Clouds"
_"Solid noise applied with Difference layer mode"
"Martin Nordholts <enselic@hotmail.com>"
"Martin Nordholts"
"2006/10/25"
"RGB* GRAY*"
SF-ONE-OR-MORE-DRAWABLE
SF-ADJUSTMENT _"Random Seed" '(0 0 1024 1 10 0 1)
SF-ADJUSTMENT _"Levels" '(1 0 15 1 10 0 1)
SF-TOGGLE _"Tileable" FALSE
SF-TOGGLE _"Turbulent" FALSE
SF-ADJUSTMENT _"X" '(4 0.1 16 0.1 1 1 0)
SF-ADJUSTMENT _"Y" '(4 0.1 16 0.1 1 1 0)
)
(script-fu-menu-register "script-fu-difference-clouds"
"<Image>/Filters/Render/Noise")
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