mirror of https://github.com/GNOME/gimp.git
175 lines
6.8 KiB
Scheme
175 lines
6.8 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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; alien-neon-logo.scm - creates multiple outlines around the letters
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; Copyright (C) 1999-2000 Raphael Quinet <quinet@gamers.org>
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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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; 1999-12-01 First version.
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; 2000-02-19 Do not discard the layer mask so that it can still be edited.
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; 2000-03-08 Adapted the script to my gimp-edit-fill changes.
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; 2000-04-02 Split the script in two parts: one using text, one using alpha.
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; 2000-05-29 More modifications for "Alpha to Logo" using a separate function.
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;
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; To do: use a channel mask for creating the bands, instead of working in the
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; image. gimp-invert would then work on one grayscale channel instead of
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; wasting CPU cycles on three identical R, G, B channels.
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;
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(define (apply-alien-neon-logo-effect img
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logo-layer
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fg-color
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bg-color
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band-size
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gap-size
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num-bands
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do-fade)
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(let* ((fade-size (- (* (+ band-size gap-size) num-bands) 1))
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(width (car (gimp-drawable-width logo-layer)))
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(height (car (gimp-drawable-height logo-layer)))
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(bg-layer (car (gimp-layer-new img width height RGB-IMAGE "Background" 100 NORMAL-MODE)))
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(bands-layer (car (gimp-layer-new img width height RGBA-IMAGE "Bands" 100 NORMAL-MODE))))
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(gimp-context-push)
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(script-fu-util-image-resize-from-layer img logo-layer)
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(gimp-image-add-layer img bg-layer 1)
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(gimp-image-add-layer img bands-layer 1)
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(gimp-selection-none img)
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(gimp-context-set-background bg-color)
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(gimp-edit-fill bg-layer BACKGROUND-FILL)
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(gimp-context-set-background '(0 0 0))
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(gimp-edit-fill bands-layer BACKGROUND-FILL)
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; The text layer is never shown: it is only used to create a selection
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(gimp-selection-layer-alpha logo-layer)
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(gimp-context-set-foreground '(255 255 255))
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(gimp-edit-fill bands-layer FOREGROUND-FILL)
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; Create multiple outlines by growing and inverting the selection
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; The bands are black and white because they will be used as a mask.
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(while (> num-bands 0)
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(gimp-selection-grow img band-size)
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(gimp-invert bands-layer)
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(gimp-selection-grow img gap-size)
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(gimp-invert bands-layer)
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(set! num-bands (- num-bands 1)))
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; The fading effect is obtained by masking the image with a gradient.
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; The gradient is created by filling a bordered selection (white->black).
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(if (= do-fade TRUE)
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(let ((bands-layer-mask (car (gimp-layer-create-mask bands-layer
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ADD-BLACK-MASK))))
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(gimp-layer-add-mask bands-layer bands-layer-mask)
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(gimp-selection-layer-alpha logo-layer)
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(gimp-selection-border img fade-size)
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(gimp-edit-fill bands-layer-mask FOREGROUND-FILL)
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(gimp-layer-remove-mask bands-layer MASK-APPLY)))
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; Transfer the resulting grayscale bands into the layer mask.
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(let ((bands-layer-mask (car (gimp-layer-create-mask bands-layer
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ADD-BLACK-MASK))))
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(gimp-layer-add-mask bands-layer bands-layer-mask)
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(gimp-selection-none img)
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(gimp-edit-copy bands-layer)
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(gimp-floating-sel-anchor (car (gimp-edit-paste bands-layer-mask
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FALSE))))
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; Fill the layer with the foreground color. The areas that are not
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; masked become visible.
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(gimp-context-set-foreground fg-color)
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(gimp-edit-fill bands-layer FOREGROUND-FILL)
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;; (gimp-layer-remove-mask bands-layer MASK-APPLY)
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; Clean up and exit.
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(gimp-drawable-set-visible logo-layer 0)
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(gimp-image-set-active-layer img bands-layer)
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(gimp-displays-flush)
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(gimp-context-pop)))
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(define (script-fu-alien-neon-logo-alpha img
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logo-layer
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fg-color
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bg-color
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band-size
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gap-size
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num-bands
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do-fade)
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(begin
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(gimp-image-undo-group-start img)
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(apply-alien-neon-logo-effect img logo-layer fg-color bg-color
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band-size gap-size num-bands do-fade)
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(gimp-image-undo-group-end img)
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(gimp-displays-flush)))
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(script-fu-register "script-fu-alien-neon-logo-alpha"
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_"Alien _Neon..."
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"Creates a psychedelic effect with outlines of the specified color around the letters"
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"Raphael Quinet (quinet@gamers.org)"
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"Raphael Quinet"
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"1999-2000"
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"RGBA"
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SF-IMAGE "Image" 0
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SF-DRAWABLE "Drawable" 0
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SF-COLOR _"Glow color" '(0 255 0)
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SF-COLOR _"Background color" '(0 0 0)
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SF-ADJUSTMENT _"Width of bands" '(2 1 60 1 10 0 0)
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SF-ADJUSTMENT _"Width of gaps" '(2 1 60 1 10 0 0)
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SF-ADJUSTMENT _"Number of bands" '(7 1 100 1 10 0 1)
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SF-TOGGLE _"Fade away" TRUE)
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(script-fu-menu-register "script-fu-alien-neon-logo-alpha"
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"<Image>/Filters/Alpha to Logo")
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(define (script-fu-alien-neon-logo text
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size
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fontname
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fg-color
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bg-color
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band-size
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gap-size
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num-bands
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do-fade)
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(let* ((img (car (gimp-image-new 256 256 RGB)))
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(fade-size (- (* (+ band-size gap-size) num-bands) 1))
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(text-layer (car (gimp-text-fontname img -1 0 0 text (+ fade-size 10) TRUE size PIXELS fontname))))
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(gimp-image-undo-disable img)
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(apply-alien-neon-logo-effect img text-layer fg-color bg-color
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band-size gap-size num-bands do-fade)
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(gimp-image-undo-enable img)
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(gimp-display-new img)))
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(script-fu-register "script-fu-alien-neon-logo"
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_"Alien _Neon..."
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"Creates a psychedelic effect with outlines of the specified color around the letters"
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"Raphael Quinet (quinet@gamers.org)"
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"Raphael Quinet"
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"1999-2000"
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""
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SF-STRING _"Text" "The GIMP"
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SF-ADJUSTMENT _"Font size (pixels)" '(150 2 1000 1 10 0 1)
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SF-FONT _"Font" "Blippo"
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SF-COLOR _"Glow color" '(0 255 0)
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SF-COLOR _"Background color" '(0 0 0)
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SF-ADJUSTMENT _"Width of bands" '(2 1 60 1 10 0 0)
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SF-ADJUSTMENT _"Width of gaps" '(2 1 60 1 10 0 0)
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SF-ADJUSTMENT _"Number of bands" '(7 1 100 1 10 0 1)
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SF-TOGGLE _"Fade away" TRUE)
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(script-fu-menu-register "script-fu-alien-neon-logo"
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"<Toolbox>/Xtns/Logos")
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