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GIMP Script-Fu Script | 1999-07-21 | 5.2 KB | 153 lines |
- ; fade-outline.scm
- ; version 1.1
- ;
- ; This GIMP script_fu operates on a single Layer
- ; It makes it's outline boarder transparent by
- ; adding a layer mask that is black (transparent) at the outline
- ; and blends into white (opaque) at the inner regions of the
- ; shape. The user can specify the thickness of the fading border
- ; that is used to blend from transparent to opaque.
- ;
- ; The outline is taken from the current selection
- ; or from the layers alpha channel if no selection is active.
- ;
- ; Optional you may keep the generated layermask or apply
- ; it to the layer
-
- ;
- ; The GIMP -- an 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.
-
-
- ; Define the main function:
-
- (define (script-fu-fade-outline inImage
- inLayer
- inBorderSize
- inApplyMask
- inClearUnselected
- )
-
- (let* ((l-idx 0)
- (l-step (/ 25500 (+ inBorderSize 1)))
- (l-gray l-step)
- (l-old-bg-color (car (gimp-palette-get-background)))
- (l-has-selection TRUE)
-
- )
-
- ; do nothing if the layer is a layer mask
- (if (= (car (gimp-drawable-layer-mask inLayer)) 0)
- (begin
-
- (gimp-undo-push-group-start inImage)
-
- ; if the layer has no alpha add alpha channel
- (if (= (car (gimp-drawable-has-alpha inLayer)) FALSE)
- (begin
- (gimp-layer-add-alpha inLayer)
- )
- )
-
- ; if the layer is the floating selection convert to normal layer
- ; because floating selection cant have a layer mask
- (if (> (car (gimp-layer-is-floating-sel inLayer)) 0)
- (begin
- (gimp-floating-sel-to-layer inLayer)
- )
- )
-
- ; if there is no selection we use the layers alpha channel
- (if (= (car (gimp-selection-is-empty inImage)) TRUE)
- (begin
- (set! l-has-selection FALSE)
- (gimp-selection-layer-alpha inImage inLayer)
- )
- )
-
- ; apply the existing mask before creating a new one
- (gimp-image-remove-layer-mask inImage inLayer 0)
-
- (if (= inClearUnselected TRUE)
- (begin
- (set! l-mask (car (gimp-layer-create-mask inLayer BLACK-MASK)))
- )
- (begin
- (set! l-mask (car (gimp-layer-create-mask inLayer WHITE-MASK)))
- )
- )
-
- (gimp-image-add-layer-mask inImage inLayer l-mask)
-
- (while (<= l-idx inBorderSize)
- (if (= l-idx inBorderSize)
- (begin
- (set! l-gray 25500)
- )
- )
- (gimp-palette-set-background (list (/ l-gray 100) (/ l-gray 100) (/ l-gray 100)))
- (gimp-edit-fill inImage l-mask)
- (set! l-idx (+ l-idx 1))
- (set! l-gray (+ l-gray l-step))
- (gimp-selection-shrink inImage 1)
- ; check if selection has shrinked to none
- (if (= (car (gimp-selection-is-empty inImage)) TRUE)
- (begin
- (set! l-idx (+ inBorderSize 100)) ; break the while loop
- )
- )
-
- )
-
- (if (= inApplyMask TRUE)
- (begin
- (gimp-image-remove-layer-mask inImage inLayer 0)
- )
- )
-
- (if (= l-has-selection FALSE)
- (gimp-selection-none inImage)
- )
-
- (gimp-palette-set-background l-old-bg-color)
- (gimp-undo-push-group-end inImage)
- (gimp-displays-flush)
- )
- ))
- )
-
-
-
-
- ; Register the function with the GIMP:
- ; ------------------------------------
-
- (script-fu-register
- "script-fu-fade-outline"
- "<Image>/Script-Fu/Selection/Fade Outline"
- "Blend the Layers outline border to transparent"
- "Wolfgang Hofer <wolfgang.hofer@siemens.at>"
- "Wolfgang Hofer"
- "19 May 1998"
- "RGB RGBA GRAY GRAYA"
- SF-IMAGE "The Image" 0
- SF-DRAWABLE "The Layer" 0
- SF-VALUE "Border Size:" "10"
- SF-TOGGLE "Apply generated Layermask?" FALSE
- SF-TOGGLE "Clear unselected Maskarea?" TRUE
- )
-