406cc7c0c7
Add S-expression based video effects pipeline with modular effect definitions, constructs, and recipe files. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
29 lines
1.5 KiB
Common Lisp
29 lines
1.5 KiB
Common Lisp
;; ASCII Zones effect - different character sets for different brightness zones
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;; Dark areas use simple chars, mid uses standard, bright uses blocks
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;; @param char_size int [4, 32] default 8
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;; @param dark_threshold int [0, 128] default 80
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;; @param bright_threshold int [128, 255] default 180
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;; @param color_mode string default "color"
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(define-effect ascii_zones
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((char_size 8) (dark_threshold 80) (bright_threshold 180) (color_mode "color"))
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(let* ((sample (cell-sample frame char_size))
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(colors (nth sample 0))
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(luminances (nth sample 1))
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;; Start with simple chars as base
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(base-chars (luminance-to-chars luminances "simple" 1.2))
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;; Map each cell to appropriate alphabet based on brightness zone
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(zoned-chars (map-char-grid base-chars luminances
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(lambda (r c ch lum)
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(cond
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;; Bright zones: use block characters
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((> lum bright_threshold)
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(alphabet-char "blocks" (floor (/ (- lum bright_threshold) 15))))
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;; Dark zones: use simple sparse chars
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((< lum dark_threshold)
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(alphabet-char " .-" (floor (/ lum 30))))
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;; Mid zones: use standard ASCII
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(else
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(alphabet-char "standard" (floor (/ lum 4)))))))))
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(render-char-grid frame zoned-chars colors char_size color_mode (list 0 0 0))))
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