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;; pandora-combine.scm: Move layers around to make a panorama.
;; Copyright (C) 2006 by Akkana Peck, akkana@shallowsky.com.
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License.
;; Pandora Combine:
;; Start by opening all the images of your panorama as separate
;; layers in a single image, with the bottom layer being the leftmost.
;; Then run pandora-combine on that image.
(define (script-fu-pandora-combine img drawable
overlap top-on-right use-mask)
;; Calculate the size for the new image
(let* ((layers (gimp-image-get-layers img))
(num-layers (car layers))
(layer-array (cadr layers))
(bottomlayer (aref layer-array (- num-layers 1)))
; Pandora assumes that all layers are the same size as the first:
; XXX change this eventually.
(layer-w (car (gimp-drawable-width bottomlayer)))
(layer-h (car (gimp-drawable-height bottomlayer)))
(overlap-frac (/ overlap 100))
(extra-frac (- 1.0 overlap-frac))
(hslop (/ layer-w 4))
(vslop (/ (* hslop 3) 2))
(pan-img-w (* layer-w (+ 1 (* (- num-layers 0.3) (- 1 overlap-frac)))))
(pan-img-h (+ layer-h vslop))
(newy (/ vslop 2))
(i (- num-layers 1) 1) ; start from the bottom layer
)
;(gimp-message (number->string pan-img-w))
(gimp-image-undo-group-start img)
(gimp-image-resize img pan-img-w pan-img-h 0 0)
;; Loop over the layers starting with the second, moving each one.
;; Layers are numbered starting with 0 as the top layer in the stack.
;(gimp-layer-translate bottomlayer 0 newy)
(gimp-context-push)
(while (>= i 0)
;(gimp-message (number->string i))
(let* ((thislayer (aref layer-array i))
(thislayer-w (car (gimp-drawable-width thislayer)))
(newx (if (= top-on-right TRUE)
(* (- (- num-layers i) 1)
(* thislayer-w extra-frac))
(* i (* thislayer-w extra-frac))
))
)
(if (= (car (gimp-layer-is-floating-sel thislayer)) FALSE)
(begin
(gimp-layer-translate thislayer newx newy)
(if (and (= use-mask TRUE)
(= (car (gimp-layer-get-mask thislayer)) -1)
(not (= i (- num-layers 1))))
(let* ((masklayer (car (gimp-layer-create-mask
thislayer ADD-BLACK-MASK)))
(grad-w (* (* layer-w overlap-frac) 0.5))
(grad-start (if (= top-on-right TRUE)
grad-w
(- thislayer-w grad-w)))
(grad-end (if (= top-on-right TRUE)
0 thislayer-w))
)
(gimp-layer-add-alpha thislayer)
(gimp-layer-add-mask thislayer masklayer)
(gimp-context-set-foreground '(255 255 255))
(gimp-context-set-background '(0 0 0))
(gimp-edit-blend masklayer FG-BG-RGB-MODE NORMAL-MODE
GRADIENT-LINEAR 100 0 REPEAT-NONE FALSE
FALSE 0 0 TRUE
grad-start 0 grad-end 0)
(gimp-layer-set-edit-mask thislayer FALSE)
))))
)
(set! i (- i 1))
)
(gimp-context-pop)
(gimp-image-undo-group-end img)
(gimp-displays-flush)
)
)
(if (symbol-bound? 'script-fu-menu-register (the-environment))
(begin
(script-fu-register "script-fu-pandora-combine"
_"Arrange as Panorama..."
_"Line up layers as a panorama"
"Akkana Peck"
"Akkana Peck"
"June 2006"
"*"
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-ADJUSTMENT _"Overlap (percent)" '(50 0 100 1 10 0 1)
SF-TOGGLE _"Top Layer on Right" TRUE
SF-TOGGLE _"Use Layer Masks" TRUE
)
(script-fu-menu-register "script-fu-pandora-combine"
_"<Image>/Filters/Combine")
) ; end begin
(script-fu-register "script-fu-pandora-combine"
_"<Image>/Filters/Combine/Arrange as Panorama..."
_"Line up layers as a panorama"
"Akkana Peck"
"Akkana Peck"
"June 2006"
"*"
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-ADJUSTMENT _"Overlap (percent)" '(50 0 100 1 10 0 1)
SF-TOGGLE _"Top Layer on Right" TRUE
SF-TOGGLE _"Use Layer Masks" TRUE
)
)
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