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GIMP Script-Fu Script | 2009-12-15 | 9.0 KB | 296 lines |
- ; GIMP - The GNU 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.
- ;
- ; NEON
- ; Create a text effect that simulates neon lighting
-
- (define (apply-neon-logo-effect img
- tube-layer
- size
- bg-color
- glow-color
- shadow)
-
- (define (set-pt a index x y)
- (begin
- (aset a (* index 2) x)
- (aset a (+ (* index 2) 1) y)))
-
- (define (neon-spline1)
- (let* ((a (cons-array 6 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 127 145)
- (set-pt a 2 255 255)
- a))
-
- (define (neon-spline2)
- (let* ((a (cons-array 6 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 110 150)
- (set-pt a 2 255 255)
- a))
-
- (define (neon-spline3)
- (let* ((a (cons-array 6 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 100 185)
- (set-pt a 2 255 255)
- a))
-
- (define (neon-spline4)
- (let* ((a (cons-array 8 'byte)))
- (set-pt a 0 0 0)
- (set-pt a 1 64 64)
- (set-pt a 2 127 192)
- (set-pt a 3 255 255)
- a))
-
- (define (find-hue-offset color)
- (let* (
- (R (car color))
- (G (cadr color))
- (B (caddr color))
- (max-val (max R G B))
- (min-val (min R G B))
- (delta (- max-val min-val))
- (hue 0)
- )
- (if (= delta 0)
- 0
- (begin
- (cond
- ((= max-val R)
- (set! hue (/ (- G B) (* 1.0 delta))))
- ((= max-val G)
- (set! hue (+ 2 (/ (- B R) (* 1.0 delta)))))
- ((= max-val B)
- (set! hue (+ 4 (/ (- R G) (* 1.0 delta)))))
- )
- (set! hue (* hue 60))
- (if (< hue 0) (set! hue (+ hue 360)))
- (if (> hue 360) (set! hue (- hue 360)))
- (if (> hue 180) (set! hue (- hue 360)))
- hue
- )
- )
- )
- )
-
- (let* (
- (tube-hue (find-hue-offset glow-color))
- (shrink (/ size 14))
- (grow (/ size 40))
- (feather (/ size 5))
- (feather1 (/ size 25))
- (feather2 (/ size 12))
- (inc-shrink (/ size 100))
- (shadow-shrink (/ size 40))
- (shadow-feather (/ size 20))
- (shadow-offx (/ size 10))
- (shadow-offy (/ size 10))
- (width (car (gimp-drawable-width tube-layer)))
- (height (car (gimp-drawable-height tube-layer)))
- (glow-layer (car (gimp-layer-new img width height RGBA-IMAGE
- "Neon Glow" 100 NORMAL-MODE)))
- (bg-layer (car (gimp-layer-new img width height RGB-IMAGE
- "Background" 100 NORMAL-MODE)))
- (shadow-layer (if (= shadow TRUE)
- (car (gimp-layer-new img width height RGBA-IMAGE
- "Shadow" 100 NORMAL-MODE))
- 0))
- (selection 0)
- (max_shrink 0)
- )
-
- (gimp-context-push)
-
- ; ensure that we don't shrink selection so much
- ; that we create an empty selection.
- (gimp-selection-layer-alpha tube-layer)
- (while (= (car (gimp-selection-is-empty img)) FALSE)
- (begin
- (gimp-selection-shrink img 1)
- (set! max_shrink (+ max_shrink 1))
- ; escape early if we know that we can perform
- ; as much shrink steps as we want
- (if (> max_shrink shrink)
- (gimp-selection-none img))
- )
- )
- (if (= (car (gimp-selection-is-empty img)) TRUE)
- (if (> max_shrink 0)
- (set! max_shrink (- max_shrink 1))))
- ; clamp upper bounds to valid shrink step range
- (if (> shrink max_shrink)
- (set! shrink max_shrink))
- (if (> inc-shrink (/ max_shrink 3))
- (set! inc-shrink (/ max_shrink 3)))
- (if (> shadow-shrink max_shrink)
- (set! shadow-shrink max_shrink))
-
- (script-fu-util-image-resize-from-layer img tube-layer)
- (script-fu-util-image-add-layers img glow-layer bg-layer)
- (if (not (= shadow 0))
- (begin
- (gimp-image-add-layer img shadow-layer -1)
- (gimp-edit-clear shadow-layer)))
-
- (gimp-context-set-background '(0 0 0))
- (gimp-selection-layer-alpha tube-layer)
- (set! selection (car (gimp-selection-save img)))
- (gimp-selection-none img)
-
- (gimp-edit-clear glow-layer)
- (gimp-edit-clear tube-layer)
-
- (gimp-context-set-background bg-color)
- (gimp-edit-fill bg-layer BACKGROUND-FILL)
-
- (gimp-selection-load selection)
- (gimp-context-set-background '(255 255 255))
- (gimp-edit-fill tube-layer BACKGROUND-FILL)
- (gimp-selection-shrink img shrink)
- (gimp-context-set-background '(0 0 0))
- (gimp-edit-fill selection BACKGROUND-FILL)
- (gimp-edit-clear tube-layer)
-
- (gimp-selection-none img)
- (if (not (= feather1 0))
- (plug-in-gauss-rle RUN-NONINTERACTIVE img tube-layer feather1 TRUE TRUE))
- (gimp-selection-load selection)
- (if (not (= feather2 0))
- (plug-in-gauss-rle RUN-NONINTERACTIVE img tube-layer feather2 TRUE TRUE))
-
- (gimp-selection-feather img inc-shrink)
- (gimp-selection-shrink img inc-shrink)
- (gimp-curves-spline tube-layer 4 6 (neon-spline1))
-
- (gimp-selection-load selection)
- (gimp-selection-feather img inc-shrink)
- (gimp-selection-shrink img (* inc-shrink 2))
- (gimp-curves-spline tube-layer 4 6 (neon-spline2))
-
- (gimp-selection-load selection)
- (gimp-selection-feather img inc-shrink)
- (gimp-selection-shrink img (* inc-shrink 3))
- (gimp-curves-spline tube-layer 4 6 (neon-spline3))
-
- (gimp-layer-set-lock-alpha tube-layer 1)
- (gimp-selection-layer-alpha tube-layer)
- (gimp-selection-invert img)
- (gimp-context-set-background glow-color)
- (gimp-edit-fill tube-layer BACKGROUND-FILL)
-
- (gimp-selection-none img)
- (gimp-layer-set-lock-alpha tube-layer 0)
- (gimp-curves-spline tube-layer 4 8 (neon-spline4))
-
- (gimp-selection-load selection)
- (gimp-selection-grow img grow)
- (gimp-selection-invert img)
- (gimp-edit-clear tube-layer)
- (gimp-selection-invert img)
-
- (gimp-selection-feather img feather)
- (gimp-edit-fill glow-layer BACKGROUND-FILL)
-
- (if (not (= shadow 0))
- (begin
- (gimp-selection-load selection)
- (gimp-selection-grow img grow)
- (gimp-selection-shrink img shadow-shrink)
- (gimp-selection-feather img shadow-feather)
- (gimp-selection-translate img shadow-offx shadow-offy)
- (gimp-context-set-background '(0 0 0))
- (gimp-edit-fill shadow-layer BACKGROUND-FILL)))
- (gimp-selection-none img)
-
- (gimp-drawable-set-name tube-layer "Neon Tubes")
- (gimp-image-remove-channel img selection)
-
- (gimp-context-pop)
- )
- )
-
- (define (script-fu-neon-logo-alpha img
- tube-layer
- size
- bg-color
- glow-color
- shadow)
- (begin
- (gimp-image-undo-group-start img)
- (apply-neon-logo-effect img tube-layer (* size 5) bg-color glow-color shadow)
- (gimp-image-undo-group-end img)
- (gimp-displays-flush)
- )
- )
-
- (script-fu-register "script-fu-neon-logo-alpha"
- _"N_eon..."
- _"Convert the selected region (or alpha) into a neon-sign like object"
- "Spencer Kimball"
- "Spencer Kimball"
- "1997"
- "RGBA"
- SF-IMAGE "Image" 0
- SF-DRAWABLE "Drawable" 0
- SF-ADJUSTMENT _"Effect size (pixels)" '(30 1 200 1 10 0 1)
- SF-COLOR _"Background color" "black"
- SF-COLOR _"Glow color" '(38 211 255)
- SF-TOGGLE _"Create shadow" FALSE
- )
-
- (script-fu-menu-register "script-fu-neon-logo-alpha"
- "<Image>/Filters/Alpha to Logo")
-
- (define (script-fu-neon-logo text
- size
- font
- bg-color
- glow-color
- shadow)
- (let* (
- (img (car (gimp-image-new 256 256 RGB)))
- (border (/ size 4))
- (tube-layer (car (gimp-text-fontname img -1 0 0 text border TRUE size PIXELS font)))
- )
- (gimp-image-undo-disable img)
- (apply-neon-logo-effect img tube-layer size bg-color glow-color shadow)
- (gimp-image-undo-enable img)
- (gimp-display-new img)
- )
- )
-
- (script-fu-register "script-fu-neon-logo"
- _"N_eon..."
- _"Create a logo in the style of a neon sign"
- "Spencer Kimball"
- "Spencer Kimball"
- "1997"
- ""
- SF-STRING _"Text" "NEON"
- SF-ADJUSTMENT _"Font size (pixels)" '(150 2 1000 1 10 0 1)
- SF-FONT _"Font" "Blippo"
- SF-COLOR _"Background color" "black"
- SF-COLOR _"Glow color" '(38 211 255)
- SF-TOGGLE _"Create shadow" FALSE
- )
-
- (script-fu-menu-register "script-fu-neon-logo"
- "<Image>/File/Create/Logos")
-