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GIMP Script-Fu Script | 2005-06-30 | 6.1 KB | 174 lines |
- ; fade-outline.scm
- ; version 1.1.11a
- ;
- ; This GIMP script_fu operates on a single Layer
- ; It blends the outline boarder from one to another transparency level
- ; by adding a layer_mask that follows the shape of the selection.
- ; usually from 100% (white is full opaque) to 0% (black is full transparent)
- ;
- ; The user can specify the thickness of the fading border
- ; that is used to blend from transparent to opaque
- ; and the Fading direction (shrink or grow).
- ;
- ; 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
- inFadeFrom
- inFadeTo
- inGrowingSelection
- inApplyMask
- inClearUnselected)
- (let* ((l-idx 0)
- (l-has-selection TRUE))
-
- (gimp-context-push)
-
- ; check Fade from and To Values (and force values from 0% to 100%)
- (if (> inFadeFrom 100) (begin (set! inFadeFrom 100 )) )
- (if (< inFadeFrom 0) (begin (set! inFadeFrom 0 )) )
- (if (> inFadeTo 100) (begin (set! inFadeTo 100 )) )
- (if (< inFadeTo 0) (begin (set! inFadeTo 0 )) )
-
- (set! l-from-gray (* inFadeFrom 255))
- (set! l-to-gray (* inFadeTo 255))
- (set! l-step (/ (- l-from-gray l-to-gray) (+ inBorderSize 1)))
- (set! l-gray l-to-gray)
-
- ; do nothing if the layer is a layer mask
- (if (= (car (gimp-drawable-is-layer-mask inLayer)) 0)
- (begin
-
- (gimp-image-undo-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 inLayer)))
-
- (gimp-selection-sharpen inImage)
-
- ; apply the existing mask before creating a new one
- (gimp-layer-remove-mask inLayer 0)
-
- (if (= inClearUnselected TRUE)
- (begin
- (set! l-mask (car (gimp-layer-create-mask inLayer ADD-BLACK-MASK))))
- (begin
- (set! l-mask (car (gimp-layer-create-mask inLayer ADD-WHITE-MASK)))))
-
- (gimp-layer-add-mask inLayer l-mask)
-
- (if (= inGrowingSelection TRUE)
- (begin
- (set! l-gray l-from-gray)
- (set! l-from-gray l-to-gray)
- (set! l-to-gray l-gray)
- (set! l-step (/ (- l-from-gray l-to-gray) (+ inBorderSize 1)))
- (set! l-orig-selection (car (gimp-selection-save inImage)))
- (gimp-selection-invert inImage)))
-
- (while (<= l-idx inBorderSize)
- (if (= l-idx inBorderSize)
- (begin
- (set! l-gray l-from-gray)))
-
- (gimp-context-set-background (list (/ l-gray 100) (/ l-gray 100) (/ l-gray 100)))
- (gimp-edit-fill l-mask BACKGROUND-FILL)
- (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 (= inGrowingSelection TRUE)
- (begin
- (gimp-selection-load l-orig-selection)
- (gimp-context-set-background (list (/ l-to-gray 100) (/ l-to-gray 100) (/ l-to-gray 100)))
- (gimp-edit-fill l-mask BACKGROUND-FILL)
- (gimp-selection-grow inImage inBorderSize)
- (gimp-selection-invert inImage)
- (if (= inClearUnselected TRUE)
- (begin
- ;(gimp-context-set-background (list (/ l-from-gray 100) (/ l-from-gray 100) (/ l-from-gray 100)))
- (gimp-context-set-background (list 0 0 0)))
-
- (begin
- (gimp-context-set-background (list 255 255 255))))
-
- (gimp-edit-fill l-mask BACKGROUND-FILL)
- (gimp-image-remove-channel inImage l-orig-selection)))
-
- (if (= inApplyMask TRUE)
- (begin
- (gimp-layer-remove-mask inLayer 0)))
-
- (if (= l-has-selection FALSE)
- (gimp-selection-none inImage))
-
- (gimp-image-undo-group-end inImage)
- (gimp-displays-flush)))
-
- (gimp-context-pop)))
-
-
- (script-fu-register "script-fu-fade-outline"
- _"_Fade Outline..."
- "Blend the Layers outline border from one alpha value (opaque) to another (transparent) by generating a Layermask"
- "Wolfgang Hofer <hof@hotbot.com>"
- "Wolfgang Hofer"
- "10 Nov 1999"
- "RGB* GRAY*"
- SF-IMAGE "The image" 0
- SF-DRAWABLE "The layer" 0
- SF-ADJUSTMENT _"Border size" '(10 1 300 1 10 0 1)
- SF-ADJUSTMENT _"Fade from %" '(100 0 100 1 10 0 0)
- SF-ADJUSTMENT _"Fade to %" '(0 0 100 1 10 0 0)
- SF-TOGGLE _"Use growing selection" FALSE
- SF-TOGGLE _"Apply generated layermask" FALSE
- SF-TOGGLE _"Clear unselected maskarea" TRUE)
-
- (script-fu-menu-register "script-fu-fade-outline"
- _"<Image>/Script-Fu/Selection")
-