mirror of https://github.com/GNOME/gimp.git
195 lines
6.9 KiB
Scheme
195 lines
6.9 KiB
Scheme
; The GIMP -- an image manipulation program
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; Copyright (C) 1995 Spencer Kimball and Peter Mattis
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;
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; add-bevel.scm version 1.04
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; Time-stamp: <2004-02-09 17:07:06 simon>
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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 2 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, write to the Free Software
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; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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;
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; Copyright (C) 1997 Andrew Donkin (ard@cs.waikato.ac.nz)
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; Contains code from add-shadow.scm by Sven Neumann
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; (neumanns@uni-duesseldorf.de) (thanks Sven).
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;
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; Adds a bevel to an image. See http://www.cs.waikato.ac.nz/~ard/gimp/
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;
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; If there is a selection, it is bevelled.
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; Otherwise if there is an alpha channel, the selection is taken from it
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; and bevelled.
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; Otherwise the whole image is bevelled.
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;
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; The selection is set on exit, so Select->Invert then Edit->Clear will
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; leave a cut-out. Then use Sven's add-shadow for that
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; floating-bumpmapped-texture cliche.
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;
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; 1.01: now works on offset layers.
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; 1.02: has crop-pixel-border option to trim one pixel off each edge of the
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; bevelled image. Bumpmapping leaves edge pixels unchanged, which
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; looks bad. Oddly, this is not apparant in the GIMP - you have to
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; save the image and load it into another viewer. First noticed in
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; Nutscrape.
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; Changed path (removed "filters/").
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; 1.03: adds one-pixel border before bumpmapping, and removes it after.
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; Got rid of the crop-pixel-border option (no longer reqd).
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; 1.04: Fixed undo handling, ensure that bumpmap is big enough,
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; (instead of resizing the image). Removed references to outdated
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; bumpmap plugin. (Simon)
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;
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(define (script-fu-add-bevel img
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drawable
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thickness
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work-on-copy
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keep-bump-layer)
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(let* ((index 0)
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(bevelling-whole-image FALSE)
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(greyness 0)
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(thickness (abs thickness))
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(type (car (gimp-drawable-type-with-alpha drawable)))
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(image (if (= work-on-copy TRUE) (car (gimp-image-duplicate img)) img))
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(pic-layer (car (gimp-image-get-active-drawable image)))
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(offsets (gimp-drawable-offsets pic-layer))
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(width (car (gimp-drawable-width pic-layer)))
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(height (car (gimp-drawable-height pic-layer)))
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; Bumpmap has a one pixel border on each side
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(bump-layer (car (gimp-layer-new image
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(+ width 2)
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(+ height 2)
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GRAY
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"Bumpmap"
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100
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NORMAL-MODE)))
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(bevelling-whole-image TRUE)
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(select))
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(gimp-context-push)
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; disable undo on copy, start group otherwise
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(if (= work-on-copy TRUE)
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(gimp-image-undo-disable image)
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(gimp-image-undo-group-start image)
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)
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(gimp-image-add-layer image bump-layer 1)
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; If the layer we're bevelling is offset from the image's origin, we
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; have to do the same to the bumpmap
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(gimp-layer-set-offsets bump-layer (- (car offsets) 1)
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(- (cadr offsets) 1))
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;------------------------------------------------------------
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;
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; Set the selection to the area we want to bevel.
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;
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(if (eq? 0 (car (gimp-selection-bounds image)))
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(begin
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(set! bevelling-whole-image TRUE) ; ...so we can restore things properly, and crop.
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(if (car (gimp-drawable-has-alpha pic-layer))
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(gimp-selection-layer-alpha pic-layer)
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(gimp-selection-all image)
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)
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)
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)
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; Store it for later.
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(set! select (car (gimp-selection-save image)))
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; Try to lose the jaggies
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(gimp-selection-feather image 2)
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;------------------------------------------------------------
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;
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; Initialise our bumpmap
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;
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(gimp-context-set-background '(0 0 0))
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(gimp-drawable-fill bump-layer BACKGROUND-FILL)
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(set! index 1)
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(while (< index thickness)
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(set! greyness (/ (* index 255) thickness))
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(gimp-context-set-background (list greyness greyness greyness))
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;(gimp-selection-feather image 1) ;Stop the slopey jaggies?
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(gimp-edit-bucket-fill bump-layer BG-BUCKET-FILL NORMAL-MODE
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100 0 FALSE 0 0)
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(gimp-selection-shrink image 1)
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(set! index (+ index 1))
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)
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; Now the white interior
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(gimp-context-set-background '(255 255 255))
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(gimp-edit-bucket-fill bump-layer BG-BUCKET-FILL NORMAL-MODE
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100 0 FALSE 0 0)
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;------------------------------------------------------------
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;
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; Do the bump.
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;
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(gimp-selection-none image)
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; To further lessen jaggies?
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;(plug-in-gauss-rle 1 image bump-layer thickness TRUE TRUE)
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;
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; BUMPMAP INVOCATION:
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;
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(plug-in-bump-map 1 image pic-layer bump-layer 125 45 3 0 0 0 0 TRUE FALSE 1)
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;------------------------------------------------------------
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;
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; Restore things
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;
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(if (= bevelling-whole-image TRUE)
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(gimp-selection-none image) ; No selection to start with
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(gimp-selection-load select)
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)
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; If they started with a selection, they can Select->Invert then
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; Edit->Clear for a cutout.
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; clean up
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(gimp-image-remove-channel image select)
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(if (= keep-bump-layer TRUE)
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(gimp-drawable-set-visible bump-layer 0)
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(gimp-image-remove-layer image bump-layer))
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(gimp-image-set-active-layer image pic-layer)
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; enable undo / end undo group
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(if (= work-on-copy TRUE)
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(begin
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(gimp-display-new image)
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(gimp-image-undo-enable image))
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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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(script-fu-register "script-fu-add-bevel"
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_"Add B_evel..."
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"Add a bevel to an image"
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"Andrew Donkin <ard@cs.waikato.ac.nz>"
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"Andrew Donkin"
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"1997/11/06"
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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 _"Thickness" '(5 0 30 1 2 0 0)
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SF-TOGGLE _"Work on copy" TRUE
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SF-TOGGLE _"Keep bump layer" FALSE)
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(script-fu-menu-register "script-fu-add-bevel"
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"<Image>/Filters/Decor")
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