mirror of https://github.com/GNOME/gimp.git
146 lines
5.2 KiB
Scheme
146 lines
5.2 KiB
Scheme
; Chris Gutteridge (cjg@ecs.soton.ac.uk)
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; At ECS Dept, University of Southampton, England.
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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 3 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, see <https://www.gnu.org/licenses/>.
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(define (script-fu-coffee-stain inImage inLayers inNumber inDark inGradient)
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; Use v3 binding of return values from PDB calls
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(script-fu-use-v3)
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(let* (
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(theImage inImage)
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(theHeight (gimp-image-get-height theImage))
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(theWidth (gimp-image-get-width theImage))
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(theNumber inNumber)
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(theSize (min theWidth theHeight))
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(theStain 0)
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(theThreshold 0)
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(theSpread 0)
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)
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(gimp-context-push)
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(gimp-context-set-defaults)
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(gimp-image-undo-group-start theImage)
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(while (> theNumber 0)
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(set! theNumber (- theNumber 1))
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(set! theStain (gimp-layer-new theImage theSize theSize
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RGBA-IMAGE _"Stain" 100
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(if inDark
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LAYER-MODE-DARKEN-ONLY
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LAYER-MODE-NORMAL)))
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(gimp-image-insert-layer theImage theStain 0 0)
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(gimp-selection-all theImage)
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(gimp-drawable-edit-clear theStain)
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(let ((blobSize (/ (rand (- theSize 40)) (+ (rand 3) 1))))
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(if (< blobSize 32) (set! blobSize 32))
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(gimp-image-select-ellipse theImage
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CHANNEL-OP-REPLACE
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(/ (- theSize blobSize) 2)
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(/ (- theSize blobSize) 2)
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blobSize blobSize)
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)
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; Clamp spread value to 'plug-in-spread' limits.
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; This plugin calls plug-in-spread indirectly via distress-selection.
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; plug-in-spread is a compatability plug-in to gegl:noise-spread.
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; gegl:noise-spread seems to have a limit of 512.
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; Here we limit to 200, for undocumented reasons.
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(set! theSpread (/ theSize 25))
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(if (> theSpread 200) (set! theSpread 200))
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; Threshold to distress-selection now allows [0, 1.0] including zero.
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; Formerly, it allowed [1, 254] (strange, but documented.)
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;
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; Here we generate a random non-uniform weighted towards center.
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; The distribution of the product (or sum) of two random numbers is non-uniform.
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; rand is a compability function for the SIOD dialect, and basically calls random.
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; random seems not standardized in Scheme, our version is MSRG in script-fu-compat.init.
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; It yields random uniform integers, except 0.
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;
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; (+ (rand 15) 1) yields [2, 16] uniform.
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; The original formula, a product of random numbers, yields [3, 255] non-uniform.
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; To accomodate changes to distress-selection, we use the old formula, and divide by 255.
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; When you instead just generate a single random float, stains are smaller.
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(set! theThreshold (/
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(- (* (+ (rand 15) 1) (+ (rand 15) 1)) 1) ; original formula
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255))
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; !!! This call is not via the PDB so SF does not range check args.
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; The script is in the interpreter state and doesn't require a PDB call.
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;
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; The called SF plugin is not yet converted to v3 binding, so switch back to v2
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; and use TRUE instead of #t
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(script-fu-use-v2)
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(script-fu-distress-selection theImage (vector theStain)
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theThreshold
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theSpread 4 2 TRUE TRUE)
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; back to v3, this is a loop
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(script-fu-use-v3)
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(gimp-context-set-gradient inGradient)
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; only fill if there is a selection
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; First element of returned list is a boolean.
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(if (car (gimp-selection-bounds theImage))
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(gimp-drawable-edit-gradient-fill theStain
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GRADIENT-SHAPEBURST-DIMPLED 0
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#f 1 0
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#t
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0 0 0 0)
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)
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(gimp-layer-set-offsets theStain
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(- (rand theWidth) (/ theSize 2))
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(- (rand theHeight) (/ theSize 2)))
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)
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(gimp-selection-none theImage)
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(gimp-image-undo-group-end theImage)
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(gimp-displays-flush)
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(gimp-context-pop)
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)
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)
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; Register as a filter
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; !!! Enabled for any non-zero count of layers.
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; Requires an image, to which we add layers.
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; Argument inLayers is not used.
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(script-fu-register-filter "script-fu-coffee-stain"
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_"_Stain..."
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_"Add layers of stain or blotch marks"
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"Chris Gutteridge"
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"1998, Chris Gutteridge / ECS dept, University of Southampton, England."
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"25th April 1998"
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"RGB*"
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SF-ONE-OR-MORE-DRAWABLE
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SF-ADJUSTMENT _"Number of stains to add" '(3 1 10 1 2 0 0)
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SF-TOGGLE _"Darken only" #t
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SF-GRADIENT _"Gradient to color stains" "Coffee"
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)
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(script-fu-menu-register "script-fu-coffee-stain" "<Image>/Filters/Decor")
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