243 lines
8.5 KiB
Scheme
243 lines
8.5 KiB
Scheme
; PIKA - Photo and Image Kooker Application
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; Copyright (C) 1995 Spencer Kimball and Peter Mattis
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;
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;
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; blend-anim.scm version 1.03 1999/12/21
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;
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; CHANGE-LOG:
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; 1.00 - initial release
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; 1.01 - some code cleanup, no real changes
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; 1.02 - use pika-message to output an error message if called
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; with less than three layers
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; 1.03 - only call blur plugin when blut-radius >= 1.0
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;
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; Copyright (C) 1997-1999 Sven Neumann <sven@gimp.org>
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;
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;
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; Blends two or more layers over a background, so that an animation can
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; be saved. A minimum of three layers is required.
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(define (script-fu-blend-anim img
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drawable
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frames
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max-blur
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looped)
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(define (multi-raise-layer image layer times)
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(while (> times 0)
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(pika-image-raise-item image layer)
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(set! times (- times 1))
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)
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)
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(let* (
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(max-blur (max max-blur 0))
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(frames (max frames 0))
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(image (car (pika-image-duplicate img)))
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(width (car (pika-image-get-width image)))
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(height (car (pika-image-get-height image)))
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(layers (pika-image-get-layers image))
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(num-layers (car layers))
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(layer-array (cadr layers))
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(slots (- num-layers 2))
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(bg-layer (aref layer-array (- num-layers 1)))
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(max-width 0)
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(max-height 0)
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(offset-x 0)
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(offset-y 0)
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)
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(if (> num-layers 2)
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(begin
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(pika-image-undo-disable image)
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(if (= looped TRUE)
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; add a copy of the lowest blend layer on top
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(let* ((copy (car (pika-layer-copy
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(aref layer-array (- num-layers 2)) TRUE))))
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(pika-image-insert-layer image copy 0 0)
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(set! layers (pika-image-get-layers image))
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(set! num-layers (car layers))
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(set! layer-array (cadr layers))
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(set! slots (- num-layers 2))
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(set! bg-layer (aref layer-array (- num-layers 1)))))
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; make all layers invisible and check for sizes
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(let* ((min-offset-x width)
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(min-offset-y height)
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(layer-count slots))
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(pika-item-set-visible bg-layer FALSE)
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(while (> layer-count -1)
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(let* ((layer (aref layer-array layer-count))
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(layer-width (+ (car (pika-drawable-get-width layer))
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(* max-blur 2)))
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(layer-height (+ (car (pika-drawable-get-height layer))
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(* max-blur 2)))
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(layer-offsets (pika-drawable-get-offsets layer))
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(layer-offset-x (- (car layer-offsets) max-blur))
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(layer-offset-y (- (cadr layer-offsets) max-blur)))
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(pika-item-set-visible layer FALSE)
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(set! max-width (max max-width layer-width))
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(set! max-height (max max-height layer-height))
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(set! min-offset-x (min min-offset-x layer-offset-x))
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(set! min-offset-y (min min-offset-y layer-offset-y))
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(set! layer-count (- layer-count 1))))
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(set! offset-x (- (car (pika-drawable-get-offsets bg-layer))
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min-offset-x))
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(set! offset-y (- (cadr (pika-drawable-get-offsets bg-layer))
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min-offset-y)))
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; create intermediate frames by merging copies of adjacent layers
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; with the background layer
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(let* ((layer-count slots))
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(while (> layer-count 0)
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(let* ((frame-count frames)
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(lower-layer (aref layer-array layer-count))
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(upper-layer (aref layer-array (- layer-count 1))))
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(while (> frame-count 0)
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(let* ((opacity (* (/ frame-count (+ frames 1)) 100))
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(blur (/ (* opacity max-blur) 100))
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(upper-copy (car (pika-layer-copy upper-layer TRUE)))
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(lower-copy (car (pika-layer-copy lower-layer TRUE)))
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(bg-copy (car (pika-layer-copy bg-layer TRUE))))
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(pika-image-insert-layer image bg-copy 0 0)
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(pika-image-insert-layer image lower-copy 0 0)
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(pika-image-insert-layer image upper-copy 0 0)
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(pika-item-set-visible upper-copy TRUE)
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(pika-item-set-visible lower-copy TRUE)
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(pika-item-set-visible bg-copy TRUE)
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(pika-layer-set-opacity upper-copy (- 100 opacity))
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(pika-layer-set-opacity lower-copy opacity)
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(pika-layer-set-opacity bg-copy 100)
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(if (> max-blur 0)
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(let* ((layer-width (car (pika-drawable-get-width upper-copy)))
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(layer-height (car (pika-drawable-get-height upper-copy))))
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(pika-layer-set-lock-alpha upper-copy FALSE)
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(pika-layer-resize upper-copy
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(+ layer-width (* blur 2))
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(+ layer-height (* blur 2))
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blur
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blur)
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(if (>= blur 1.0)
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(plug-in-gauss-rle RUN-NONINTERACTIVE
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image
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upper-copy
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blur
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TRUE TRUE))
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(set! blur (- max-blur blur))
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(pika-layer-set-lock-alpha lower-copy FALSE)
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(set! layer-width (car (pika-drawable-get-width
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lower-copy)))
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(set! layer-height (car (pika-drawable-get-height
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lower-copy)))
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(pika-layer-resize lower-copy
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(+ layer-width (* blur 2))
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(+ layer-height (* blur 2))
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blur
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blur)
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(if (>= blur 1.0)
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(plug-in-gauss-rle RUN-NONINTERACTIVE
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image
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lower-copy
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blur
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TRUE TRUE))))
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(pika-layer-resize bg-copy
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max-width
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max-height
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offset-x
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offset-y)
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(let* ((merged-layer (car (pika-image-merge-visible-layers
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image CLIP-TO-IMAGE))))
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(pika-item-set-visible merged-layer FALSE))
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(set! frame-count (- frame-count 1))))
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(set! layer-count (- layer-count 1)))))
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; merge all original blend layers but the lowest one
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; with copies of the background layer
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(let* ((layer-count 0))
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(while (< layer-count slots)
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(let* ((orig-layer (aref layer-array layer-count))
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(bg-copy (car (pika-layer-copy bg-layer TRUE))))
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(pika-image-insert-layer image
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bg-copy
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-1
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(* layer-count (+ frames 1)))
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(multi-raise-layer image
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orig-layer
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(+ (* (- slots layer-count) frames) 1))
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(pika-item-set-visible orig-layer TRUE)
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(pika-item-set-visible bg-copy TRUE)
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(pika-layer-resize bg-copy
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max-width
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max-height
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offset-x
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offset-y)
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(let* ((merged-layer (car (pika-image-merge-visible-layers
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image CLIP-TO-IMAGE))))
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(pika-item-set-visible merged-layer FALSE))
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(set! layer-count (+ layer-count 1)))))
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; merge the lowest blend layer with the background layer
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(let* ((orig-layer (aref layer-array (- num-layers 2))))
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(pika-item-set-visible bg-layer TRUE)
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(pika-item-set-visible orig-layer TRUE)
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(pika-image-merge-visible-layers image CLIP-TO-IMAGE))
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; make all layers visible again
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(let* ((result-layers (pika-image-get-layers image))
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(num-result-layers (car result-layers))
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(result-layer-array (cadr result-layers))
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(layer-count (- num-result-layers 1)))
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(while (> layer-count -1)
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(let* ((layer (aref result-layer-array layer-count))
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(name (string-append _"Frame" " "
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(number->string
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(- num-result-layers layer-count) 10))))
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(pika-item-set-visible layer TRUE)
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(pika-item-set-name layer name)
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(set! layer-count (- layer-count 1))))
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(if (= looped TRUE)
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; remove the topmost layer
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(pika-image-remove-layer image (aref result-layer-array 0))))
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(pika-image-undo-enable image)
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(pika-display-new image)
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(pika-displays-flush)
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)
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(pika-message _"Blend Animation needs at least three source layers")
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)
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)
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)
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(script-fu-register "script-fu-blend-anim"
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_"_Blend..."
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_"Create intermediate layers to blend two or more layers over a background as an animation"
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"Sven Neumann <sven@gimp.org>"
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"Sven Neumann"
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"1999/12/21"
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"RGB* GRAY*"
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SF-IMAGE "Image" 0
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SF-DRAWABLE "Drawable" 0
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SF-ADJUSTMENT _"Intermediate frames" '(3 1 1024 1 10 0 1)
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SF-ADJUSTMENT _"Max. blur radius" '(0 0 1024 1 10 0 1)
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SF-TOGGLE _"Looped" TRUE
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)
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(script-fu-menu-register "script-fu-blend-anim"
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"<Image>/Filters/Animation/")
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