e125c30cfd
The libgimp wrapper was just calling the PDB procedure. Get rid of the wrapper and make the PDB proc public. Also reorder the name argument to be in the second place, just like it was for the wrapper.
215 lines
8.6 KiB
Scheme
215 lines
8.6 KiB
Scheme
; GIMP - The GNU Image Manipulation Program
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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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; perspective-shadow.scm version 1.2 2000/11/08
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;
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; Copyright (C) 1997-2000 Sven Neumann <sven@gimp.org>
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;
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;
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; Adds a perspective shadow of the current selection or alpha-channel
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; as a layer below the active layer
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;
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(define (script-fu-perspective-shadow image
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drawables
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alpha
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rel-distance
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rel-length
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shadow-blur
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shadow-color
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shadow-opacity
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interpolation
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allow-resize)
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(let* (
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(drawable (vector-ref drawables 0))
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(shadow-blur (max shadow-blur 0))
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(shadow-opacity (min shadow-opacity 100))
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(shadow-opacity (max shadow-opacity 0))
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(rel-length (abs rel-length))
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(alpha (* (/ alpha 180) *pi*))
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(type (car (gimp-drawable-type-with-alpha drawable)))
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(image-width (car (gimp-image-get-width image)))
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(image-height (car (gimp-image-get-height image)))
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(from-selection 0)
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(active-selection 0)
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(shadow-layer 0)
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)
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(gimp-context-push)
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(gimp-context-set-defaults)
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(if (> rel-distance 24) (set! rel-distance 999999))
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(if (= rel-distance rel-length) (set! rel-distance (+ rel-distance 0.01)))
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(gimp-image-undo-group-start image)
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(gimp-layer-add-alpha drawable)
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(if (= (car (gimp-selection-is-empty image)) TRUE)
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(begin
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(gimp-image-select-item image CHANNEL-OP-REPLACE drawable)
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(set! from-selection FALSE))
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(begin
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(set! from-selection TRUE)
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(set! active-selection (car (gimp-selection-save image)))))
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(let* ((selection-bounds (gimp-selection-bounds image))
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(select-offset-x (cadr selection-bounds))
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(select-offset-y (caddr selection-bounds))
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(select-width (- (cadr (cddr selection-bounds)) select-offset-x))
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(select-height (- (caddr (cddr selection-bounds)) select-offset-y))
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(abs-length (* rel-length select-height))
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(abs-distance (* rel-distance select-height))
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(half-bottom-width (/ select-width 2))
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(half-top-width (* half-bottom-width
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(/ (- rel-distance rel-length) rel-distance)))
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(x0 (+ select-offset-x (+ (- half-bottom-width half-top-width)
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(* (cos alpha) abs-length))))
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(y0 (+ select-offset-y (- select-height
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(* (sin alpha) abs-length))))
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(x1 (+ x0 (* 2 half-top-width)))
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(y1 y0)
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(x2 select-offset-x)
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(y2 (+ select-offset-y select-height))
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(x3 (+ x2 select-width))
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(y3 y2)
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(shadow-width (+ (- (max x1 x3) (min x0 x2)) (* 2 shadow-blur)))
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(shadow-height (+ (- (max y1 y3) (min y0 y2)) (* 2 shadow-blur)))
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(shadow-offset-x (- (min x0 x2) shadow-blur))
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(shadow-offset-y (- (min y0 y2) shadow-blur)))
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(set! shadow-layer (car (gimp-layer-new image
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"Perspective Shadow"
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select-width
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select-height
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type
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shadow-opacity
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LAYER-MODE-NORMAL)))
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(gimp-image-insert-layer image shadow-layer 0 -1)
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(gimp-layer-set-offsets shadow-layer select-offset-x select-offset-y)
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(gimp-drawable-fill shadow-layer FILL-TRANSPARENT)
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(gimp-context-set-background shadow-color)
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(gimp-drawable-edit-fill shadow-layer FILL-BACKGROUND)
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(gimp-selection-none image)
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(if (= allow-resize TRUE)
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(let* ((new-image-width image-width)
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(new-image-height image-height)
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(image-offset-x 0)
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(image-offset-y 0))
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(if (< shadow-offset-x 0)
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(begin
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(set! image-offset-x (abs shadow-offset-x))
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(set! new-image-width (+ new-image-width image-offset-x))
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; adjust to new coordinate system
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(set! x0 (+ x0 image-offset-x))
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(set! x1 (+ x1 image-offset-x))
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(set! x2 (+ x2 image-offset-x))
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(set! x3 (+ x3 image-offset-x))
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))
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(if (< shadow-offset-y 0)
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(begin
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(set! image-offset-y (abs shadow-offset-y))
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(set! new-image-height (+ new-image-height image-offset-y))
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; adjust to new coordinate system
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(set! y0 (+ y0 image-offset-y))
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(set! y1 (+ y1 image-offset-y))
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(set! y2 (+ y2 image-offset-y))
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(set! y3 (+ y3 image-offset-y))
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))
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(if (> (+ shadow-width shadow-offset-x) new-image-width)
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(set! new-image-width (+ shadow-width shadow-offset-x)))
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(if (> (+ shadow-height shadow-offset-y) new-image-height)
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(set! new-image-height (+ shadow-height shadow-offset-y)))
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(gimp-image-resize image
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new-image-width
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new-image-height
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image-offset-x
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image-offset-y)))
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(gimp-context-set-transform-direction TRANSFORM-FORWARD)
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(gimp-context-set-interpolation interpolation)
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(gimp-context-set-transform-resize TRANSFORM-RESIZE-ADJUST)
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(gimp-item-transform-perspective shadow-layer
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x0 y0
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x1 y1
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x2 y2
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x3 y3)
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(if (>= shadow-blur 1.0)
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(begin
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(gimp-layer-set-lock-alpha shadow-layer FALSE)
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(gimp-layer-resize shadow-layer
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shadow-width
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shadow-height
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shadow-blur
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shadow-blur)
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(gimp-drawable-merge-new-filter shadow-layer "gegl:gaussian-blur" 0 LAYER-MODE-REPLACE 1.0
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"std-dev-x" (* 0.32 shadow-blur)
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"std-dev-y" (* 0.32 shadow-blur)
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"filter" "auto"))))
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(if (= from-selection TRUE)
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(begin
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(gimp-image-select-item image CHANNEL-OP-REPLACE active-selection)
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(gimp-drawable-edit-clear shadow-layer)
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(gimp-image-remove-channel image active-selection)))
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(if (and
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(= (car (gimp-layer-is-floating-sel drawable)) 0)
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(= from-selection FALSE))
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(gimp-image-raise-item image drawable))
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(gimp-image-set-selected-layers image (vector drawable))
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(gimp-image-undo-group-end image)
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(gimp-displays-flush)
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(gimp-context-pop)
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)
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)
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(script-fu-register-filter "script-fu-perspective-shadow"
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_"_Perspective..."
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_"Add a perspective shadow to the selected region (or alpha)"
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"Sven Neumann <sven@gimp.org>"
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"Sven Neumann"
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"2000/11/08"
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"RGB* GRAY*"
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SF-ONE-OR-MORE-DRAWABLE
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SF-ADJUSTMENT _"Angle" '(45 0 180 1 10 1 0)
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SF-ADJUSTMENT _"Relative distance of horizon" '(5 0.1 24.1 0.1 1 1 1)
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SF-ADJUSTMENT _"Relative length of shadow" '(1 0.1 24 0.1 1 1 1)
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SF-ADJUSTMENT _"Blur radius" '(3 0 1024 1 10 0 0)
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SF-COLOR _"Color" '(0 0 0)
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SF-ADJUSTMENT _"Opacity" '(80 0 100 1 10 0 0)
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SF-ENUM _"Interpolation" '("InterpolationType" "linear")
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SF-TOGGLE _"Allow resizing" FALSE
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)
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(script-fu-menu-register "script-fu-perspective-shadow"
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"<Image>/Filters/Light and Shadow/[Shadow]")
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