/usr/share/gimp/2.0/scripts/perspective-shadow.scm is in gimp-data 2.6.12-1ubuntu1.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | ; 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 2 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, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;
;
; perspective-shadow.scm version 1.2 2000/11/08
;
; Copyright (C) 1997-2000 Sven Neumann <sven@gimp.org>
;
;
; Adds a perspective shadow of the current selection or alpha-channel
; as a layer below the active layer
;
(define (script-fu-perspective-shadow image
drawable
alpha
rel-distance
rel-length
shadow-blur
shadow-color
shadow-opacity
interpolation
allow-resize)
(let* (
(shadow-blur (max shadow-blur 0))
(shadow-opacity (min shadow-opacity 100))
(shadow-opacity (max shadow-opacity 0))
(rel-length (abs rel-length))
(alpha (* (/ alpha 180) *pi*))
(type (car (gimp-drawable-type-with-alpha drawable)))
(image-width (car (gimp-image-width image)))
(image-height (car (gimp-image-height image)))
(from-selection 0)
(active-selection 0)
(shadow-layer 0)
)
(gimp-context-push)
(if (> rel-distance 24) (set! rel-distance 999999))
(if (= rel-distance rel-length) (set! rel-distance (+ rel-distance 0.01)))
(gimp-image-undo-group-start image)
(gimp-layer-add-alpha drawable)
(if (= (car (gimp-selection-is-empty image)) TRUE)
(begin
(gimp-selection-layer-alpha drawable)
(set! from-selection FALSE))
(begin
(set! from-selection TRUE)
(set! active-selection (car (gimp-selection-save image)))))
(let* ((selection-bounds (gimp-selection-bounds image))
(select-offset-x (cadr selection-bounds))
(select-offset-y (caddr selection-bounds))
(select-width (- (cadr (cddr selection-bounds)) select-offset-x))
(select-height (- (caddr (cddr selection-bounds)) select-offset-y))
(abs-length (* rel-length select-height))
(abs-distance (* rel-distance select-height))
(half-bottom-width (/ select-width 2))
(half-top-width (* half-bottom-width
(/ (- rel-distance rel-length) rel-distance)))
(x0 (+ select-offset-x (+ (- half-bottom-width half-top-width)
(* (cos alpha) abs-length))))
(y0 (+ select-offset-y (- select-height
(* (sin alpha) abs-length))))
(x1 (+ x0 (* 2 half-top-width)))
(y1 y0)
(x2 select-offset-x)
(y2 (+ select-offset-y select-height))
(x3 (+ x2 select-width))
(y3 y2)
(shadow-width (+ (- (max x1 x3) (min x0 x2)) (* 2 shadow-blur)))
(shadow-height (+ (- (max y1 y3) (min y0 y2)) (* 2 shadow-blur)))
(shadow-offset-x (- (min x0 x2) shadow-blur))
(shadow-offset-y (- (min y0 y2) shadow-blur)))
(set! shadow-layer (car (gimp-layer-new image
select-width
select-height
type
"Perspective Shadow"
shadow-opacity
NORMAL-MODE)))
(gimp-image-add-layer image shadow-layer -1)
(gimp-layer-set-offsets shadow-layer select-offset-x select-offset-y)
(gimp-drawable-fill shadow-layer TRANSPARENT-FILL)
(gimp-context-set-background shadow-color)
(gimp-edit-fill shadow-layer BACKGROUND-FILL)
(gimp-selection-none image)
(if (= allow-resize TRUE)
(let* ((new-image-width image-width)
(new-image-height image-height)
(image-offset-x 0)
(image-offset-y 0))
(if (< shadow-offset-x 0)
(begin
(set! image-offset-x (abs shadow-offset-x))
(set! new-image-width (+ new-image-width image-offset-x))
; adjust to new coordinate system
(set! x0 (+ x0 image-offset-x))
(set! x1 (+ x1 image-offset-x))
(set! x2 (+ x2 image-offset-x))
(set! x3 (+ x3 image-offset-x))
))
(if (< shadow-offset-y 0)
(begin
(set! image-offset-y (abs shadow-offset-y))
(set! new-image-height (+ new-image-height image-offset-y))
; adjust to new coordinate system
(set! y0 (+ y0 image-offset-y))
(set! y1 (+ y1 image-offset-y))
(set! y2 (+ y2 image-offset-y))
(set! y3 (+ y3 image-offset-y))
))
(if (> (+ shadow-width shadow-offset-x) new-image-width)
(set! new-image-width (+ shadow-width shadow-offset-x)))
(if (> (+ shadow-height shadow-offset-y) new-image-height)
(set! new-image-height (+ shadow-height shadow-offset-y)))
(gimp-image-resize image
new-image-width
new-image-height
image-offset-x
image-offset-y)))
(gimp-drawable-transform-perspective shadow-layer
x0 y0
x1 y1
x2 y2
x3 y3
TRANSFORM-FORWARD
interpolation
TRUE 3 TRANSFORM-RESIZE-ADJUST)
(if (>= shadow-blur 1.0)
(begin
(gimp-layer-set-lock-alpha shadow-layer FALSE)
(gimp-layer-resize shadow-layer
shadow-width
shadow-height
shadow-blur
shadow-blur)
(plug-in-gauss-rle RUN-NONINTERACTIVE
image
shadow-layer
shadow-blur
TRUE
TRUE))))
(if (= from-selection TRUE)
(begin
(gimp-selection-load active-selection)
(gimp-edit-clear shadow-layer)
(gimp-image-remove-channel image active-selection)))
(if (and
(= (car (gimp-layer-is-floating-sel drawable)) 0)
(= from-selection FALSE))
(gimp-image-raise-layer image drawable))
(gimp-image-set-active-layer image drawable)
(gimp-image-undo-group-end image)
(gimp-displays-flush)
(gimp-context-pop)
)
)
(script-fu-register "script-fu-perspective-shadow"
_"_Perspective..."
_"Add a perspective shadow to the selected region (or alpha)"
"Sven Neumann <sven@gimp.org>"
"Sven Neumann"
"2000/11/08"
"RGB* GRAY*"
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-ADJUSTMENT _"Angle" '(45 0 180 1 10 1 0)
SF-ADJUSTMENT _"Relative distance of horizon" '(5 0.1 24.1 0.1 1 1 1)
SF-ADJUSTMENT _"Relative length of shadow" '(1 0.1 24 0.1 1 1 1)
SF-ADJUSTMENT _"Blur radius" '(3 0 1024 1 10 0 0)
SF-COLOR _"Color" '(0 0 0)
SF-ADJUSTMENT _"Opacity" '(80 0 100 1 10 0 0)
SF-ENUM _"Interpolation" '("InterpolationType" "linear")
SF-TOGGLE _"Allow resizing" FALSE
)
(script-fu-menu-register "script-fu-perspective-shadow"
"<Image>/Filters/Light and Shadow/Shadow")
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