204 lines
7.4 KiB
Scheme
204 lines
7.4 KiB
Scheme
; fade-outline.scm
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; version 1.1.11a
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;
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; This GIMP script_fu operates on a single Layer
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; It blends the outline boarder from one to another transparency level
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; by adding a layer_mask that follows the shape of the selection.
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; usually from 100% (white is full opaque) to 0% (black is full transparent)
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;
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; The user can specify the thickness of the fading border
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; that is used to blend from transparent to opaque
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; and the Fading direction (shrink or grow).
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;
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; The outline is taken from the current selection
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; or from the layers alpha channel if no selection is active.
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;
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; Optional you may keep the generated layermask or apply
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; it to the layer
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;
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; 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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; 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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; Define the main function:
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(define (script-fu-fade-outline inImage
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inLayer
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inBorderSize
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inFadeFrom
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inFadeTo
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inGrowingSelection
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inApplyMask
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inClearUnselected
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)
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(let* ((l-idx 0)
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(l-old-bg-color (car (gimp-palette-get-background)))
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(l-has-selection TRUE)
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)
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; check Fade from and To Values (and force values from 0% to 100%)
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(if (> inFadeFrom 100) (begin (set! inFadeFrom 100 )) )
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(if (< inFadeFrom 0) (begin (set! inFadeFrom 0 )) )
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(if (> inFadeTo 100) (begin (set! inFadeTo 100 )) )
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(if (< inFadeTo 0) (begin (set! inFadeTo 0 )) )
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(set! l-from-gray (* inFadeFrom 255))
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(set! l-to-gray (* inFadeTo 255))
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(set! l-step (/ (- l-from-gray l-to-gray) (+ inBorderSize 1)))
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(set! l-gray l-to-gray)
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; do nothing if the layer is a layer mask
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(if (= (car (gimp-drawable-is-layer-mask inLayer)) 0)
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(begin
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(gimp-undo-push-group-start inImage)
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; if the layer has no alpha add alpha channel
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(if (= (car (gimp-drawable-has-alpha inLayer)) FALSE)
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(begin
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(gimp-layer-add-alpha inLayer)
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)
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)
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; if the layer is the floating selection convert to normal layer
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; because floating selection cant have a layer mask
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(if (> (car (gimp-layer-is-floating-sel inLayer)) 0)
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(begin
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(gimp-floating-sel-to-layer inLayer)
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)
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)
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; if there is no selection we use the layers alpha channel
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(if (= (car (gimp-selection-is-empty inImage)) TRUE)
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(begin
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(set! l-has-selection FALSE)
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(gimp-selection-layer-alpha inLayer)
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)
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)
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;
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(gimp-selection-sharpen inImage)
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; apply the existing mask before creating a new one
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(gimp-image-remove-layer-mask inImage inLayer 0)
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(if (= inClearUnselected TRUE)
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(begin
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(set! l-mask (car (gimp-layer-create-mask inLayer BLACK-MASK)))
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)
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(begin
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(set! l-mask (car (gimp-layer-create-mask inLayer WHITE-MASK)))
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)
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)
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(gimp-image-add-layer-mask inImage inLayer l-mask)
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(if (= inGrowingSelection TRUE)
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(begin
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(set! l-gray l-from-gray)
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(set! l-from-gray l-to-gray)
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(set! l-to-gray l-gray)
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(set! l-step (/ (- l-from-gray l-to-gray) (+ inBorderSize 1)))
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(set! l-orig-selection (car (gimp-selection-save inImage)))
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(gimp-selection-invert inImage)
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)
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)
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(while (<= l-idx inBorderSize)
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(if (= l-idx inBorderSize)
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(begin
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(set! l-gray l-from-gray)
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)
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)
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(gimp-palette-set-background (list (/ l-gray 100) (/ l-gray 100) (/ l-gray 100)))
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(gimp-edit-fill l-mask)
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(set! l-idx (+ l-idx 1))
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(set! l-gray (+ l-gray l-step))
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(gimp-selection-shrink inImage 1)
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; check if selection has shrinked to none
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(if (= (car (gimp-selection-is-empty inImage)) TRUE)
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(begin
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(set! l-idx (+ inBorderSize 100)) ; break the while loop
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)
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)
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)
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(if (= inGrowingSelection TRUE)
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(begin
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(gimp-selection-load l-orig-selection)
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(gimp-palette-set-background (list (/ l-to-gray 100) (/ l-to-gray 100) (/ l-to-gray 100)))
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(gimp-edit-fill l-mask)
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(gimp-selection-grow inImage inBorderSize)
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(gimp-selection-invert inImage)
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(if (= inClearUnselected TRUE)
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(begin
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;(gimp-palette-set-background (list (/ l-from-gray 100) (/ l-from-gray 100) (/ l-from-gray 100)))
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(gimp-palette-set-background (list 0 0 0))
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)
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(begin
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(gimp-palette-set-background (list 255 255 255))
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)
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)
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(gimp-edit-fill l-mask)
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(gimp-image-remove-channel inImage l-orig-selection)
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)
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)
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(if (= inApplyMask TRUE)
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(begin
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(gimp-image-remove-layer-mask inImage inLayer 0)
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)
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)
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(if (= l-has-selection FALSE)
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(gimp-selection-none inImage)
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)
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(gimp-palette-set-background l-old-bg-color)
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(gimp-undo-push-group-end inImage)
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(gimp-displays-flush)
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)
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))
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)
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; Register the function with the GIMP:
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; ------------------------------------
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(script-fu-register
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"script-fu-fade-outline"
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"<Image>/Script-Fu/Selection/Fade Outline..."
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"Blend the Layers outline border from one alpha value (opaque) to another (transparent) by generating a Layermask"
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"Wolfgang Hofer <hof@hotbot.com>"
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"Wolfgang Hofer"
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"10 Nov 1999"
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"RGB RGBA GRAY GRAYA"
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SF-IMAGE "The Image" 0
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SF-DRAWABLE "The Layer" 0
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SF-VALUE "Border Size" "10"
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SF-VALUE "Fade From (100%-0%)" "100"
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SF-VALUE "Fade To (0%-100%)" "0"
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SF-TOGGLE "Use Growing Selection?" FALSE
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SF-TOGGLE "Apply generated Layermask?" FALSE
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SF-TOGGLE "Clear unselected Maskarea?" TRUE
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)
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