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; GIMP - The GNU Image Manipulation Program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
;
; 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/>.
;
;
; blend-anim.scm version 1.03 1999/12/21
;
; CHANGE-LOG:
; 1.00 - initial release
; 1.01 - some code cleanup, no real changes
; 1.02 - use gimp-message to output an error message if called
; with less than three layers
; 1.03 - only call blur plugin when blut-radius >= 1.0
;
; Copyright (C) 1997-1999 Sven Neumann <sven@gimp.org>
;
;
; Blends two or more layers over a background, so that an animation can
; be saved. A minimum of three layers is required.
(define (script-fu-blend-anim img
drawable
frames
max-blur
looped)
(define (multi-raise-layer image layer times)
(while (> times 0)
(gimp-image-raise-item image layer)
(set! times (- times 1))
)
)
(let* (
(max-blur (max max-blur 0))
(frames (max frames 0))
(image (car (gimp-image-duplicate img)))
(width (car (gimp-image-width image)))
(height (car (gimp-image-height image)))
(layers (gimp-image-get-layers image))
(num-layers (car layers))
(layer-array (cadr layers))
(slots (- num-layers 2))
(bg-layer (aref layer-array (- num-layers 1)))
(max-width 0)
(max-height 0)
(offset-x 0)
(offset-y 0)
)
(if (> num-layers 2)
(begin
(gimp-image-undo-disable image)
(if (= looped TRUE)
; add a copy of the lowest blend layer on top
(let* ((copy (car (gimp-layer-copy
(aref layer-array (- num-layers 2)) TRUE))))
(gimp-image-insert-layer image copy 0 0)
(set! layers (gimp-image-get-layers image))
(set! num-layers (car layers))
(set! layer-array (cadr layers))
(set! slots (- num-layers 2))
(set! bg-layer (aref layer-array (- num-layers 1)))))
; make all layers invisible and check for sizes
(let* ((min-offset-x width)
(min-offset-y height)
(layer-count slots))
(gimp-item-set-visible bg-layer FALSE)
(while (> layer-count -1)
(let* ((layer (aref layer-array layer-count))
(layer-width (+ (car (gimp-drawable-width layer))
(* max-blur 2)))
(layer-height (+ (car (gimp-drawable-height layer))
(* max-blur 2)))
(layer-offsets (gimp-drawable-offsets layer))
(layer-offset-x (- (car layer-offsets) max-blur))
(layer-offset-y (- (cadr layer-offsets) max-blur)))
(gimp-item-set-visible layer FALSE)
(set! max-width (max max-width layer-width))
(set! max-height (max max-height layer-height))
(set! min-offset-x (min min-offset-x layer-offset-x))
(set! min-offset-y (min min-offset-y layer-offset-y))
(set! layer-count (- layer-count 1))))
(set! offset-x (- (car (gimp-drawable-offsets bg-layer))
min-offset-x))
(set! offset-y (- (cadr (gimp-drawable-offsets bg-layer))
min-offset-y)))
; create intermediate frames by merging copies of adjacent layers
; with the background layer
(let* ((layer-count slots))
(while (> layer-count 0)
(let* ((frame-count frames)
(lower-layer (aref layer-array layer-count))
(upper-layer (aref layer-array (- layer-count 1))))
(while (> frame-count 0)
(let* ((opacity (* (/ frame-count (+ frames 1)) 100))
(blur (/ (* opacity max-blur) 100))
(upper-copy (car (gimp-layer-copy upper-layer TRUE)))
(lower-copy (car (gimp-layer-copy lower-layer TRUE)))
(bg-copy (car (gimp-layer-copy bg-layer TRUE))))
(gimp-image-insert-layer image bg-copy 0 0)
(gimp-image-insert-layer image lower-copy 0 0)
(gimp-image-insert-layer image upper-copy 0 0)
(gimp-item-set-visible upper-copy TRUE)
(gimp-item-set-visible lower-copy TRUE)
(gimp-item-set-visible bg-copy TRUE)
(gimp-layer-set-opacity upper-copy (- 100 opacity))
(gimp-layer-set-opacity lower-copy opacity)
(gimp-layer-set-opacity bg-copy 100)
(if (> max-blur 0)
(let* ((layer-width (car (gimp-drawable-width upper-copy)))
(layer-height (car (gimp-drawable-height upper-copy))))
(gimp-layer-set-lock-alpha upper-copy FALSE)
(gimp-layer-resize upper-copy
(+ layer-width (* blur 2))
(+ layer-height (* blur 2))
blur
blur)
(if (>= blur 1.0)
(plug-in-gauss-rle RUN-NONINTERACTIVE
image
upper-copy
blur
TRUE TRUE))
(set! blur (- max-blur blur))
(gimp-layer-set-lock-alpha lower-copy FALSE)
(set! layer-width (car (gimp-drawable-width
lower-copy)))
(set! layer-height (car (gimp-drawable-height
lower-copy)))
(gimp-layer-resize lower-copy
(+ layer-width (* blur 2))
(+ layer-height (* blur 2))
blur
blur)
(if (>= blur 1.0)
(plug-in-gauss-rle RUN-NONINTERACTIVE
image
lower-copy
blur
TRUE TRUE))))
(gimp-layer-resize bg-copy
max-width
max-height
offset-x
offset-y)
(let* ((merged-layer (car (gimp-image-merge-visible-layers
image CLIP-TO-IMAGE))))
(gimp-item-set-visible merged-layer FALSE))
(set! frame-count (- frame-count 1))))
(set! layer-count (- layer-count 1)))))
; merge all original blend layers but the lowest one
; with copies of the background layer
(let* ((layer-count 0))
(while (< layer-count slots)
(let* ((orig-layer (aref layer-array layer-count))
(bg-copy (car (gimp-layer-copy bg-layer TRUE))))
(gimp-image-insert-layer image
bg-copy
-1
(* layer-count (+ frames 1)))
(multi-raise-layer image
orig-layer
(+ (* (- slots layer-count) frames) 1))
(gimp-item-set-visible orig-layer TRUE)
(gimp-item-set-visible bg-copy TRUE)
(gimp-layer-resize bg-copy
max-width
max-height
offset-x
offset-y)
(let* ((merged-layer (car (gimp-image-merge-visible-layers
image CLIP-TO-IMAGE))))
(gimp-item-set-visible merged-layer FALSE))
(set! layer-count (+ layer-count 1)))))
; merge the lowest blend layer with the background layer
(let* ((orig-layer (aref layer-array (- num-layers 2))))
(gimp-item-set-visible bg-layer TRUE)
(gimp-item-set-visible orig-layer TRUE)
(gimp-image-merge-visible-layers image CLIP-TO-IMAGE))
; make all layers visible again
(let* ((result-layers (gimp-image-get-layers image))
(num-result-layers (car result-layers))
(result-layer-array (cadr result-layers))
(layer-count (- num-result-layers 1)))
(while (> layer-count -1)
(let* ((layer (aref result-layer-array layer-count))
(name (string-append _"Frame" " "
(number->string
(- num-result-layers layer-count) 10))))
(gimp-item-set-visible layer TRUE)
(gimp-item-set-name layer name)
(set! layer-count (- layer-count 1))))
(if (= looped TRUE)
; remove the topmost layer
(gimp-image-remove-layer image (aref result-layer-array 0))))
(gimp-image-undo-enable image)
(gimp-display-new image)
(gimp-displays-flush)
)
(gimp-message _"Blend Animation needs at least three source layers")
)
)
)
(script-fu-register "script-fu-blend-anim"
_"_Blend..."
_"Create intermediate layers to blend two or more layers over a background as an animation"
"Sven Neumann <sven@gimp.org>"
"Sven Neumann"
"1999/12/21"
"RGB* GRAY*"
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-ADJUSTMENT _"Intermediate frames" '(3 1 1024 1 10 0 1)
SF-ADJUSTMENT _"Max. blur radius" '(0 0 1024 1 10 0 1)
SF-TOGGLE _"Looped" TRUE
)
(script-fu-menu-register "script-fu-blend-anim"
"<Image>/Filters/Animation/Animators")
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