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>
18 lines
652 B
Common Lisp
18 lines
652 B
Common Lisp
;; Echo effect - motion trails using frame buffer
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;; @param num_echoes int [1, 20] default 4
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;; @param decay float [0, 1] default 0.5
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(define-effect echo
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((num_echoes 4) (decay 0.5))
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(let* ((buffer (state-get 'buffer (list)))
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(new-buffer (take (cons frame buffer) (+ num_echoes 1))))
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(begin
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(state-set 'buffer new-buffer)
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;; Blend frames with decay
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(if (< (length new-buffer) 2)
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frame
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(let ((result (copy frame)))
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;; Simple blend of first two frames for now
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;; Full version would fold over all frames
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(blend-images frame (nth new-buffer 1) (* decay 0.5)))))))
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