95fcc67dcc
- Add stream_sexp_generic.py: fully generic sexp interpreter - Add streaming primitives for video sources and audio analysis - Add config system for external sources and audio files - Add templates for reusable scans and macros - Fix video/audio stream mapping in file output - Add dynamic source cycling based on sources array length - Remove old Python effect files (migrated to sexp) - Update sexp effects to use namespaced primitives Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
37 lines
1.3 KiB
Common Lisp
37 lines
1.3 KiB
Common Lisp
;; Layer effect - composite overlay over background at position
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;; Streaming-compatible: frame is background, overlay is foreground
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;; Usage: (layer background overlay :x 10 :y 20 :opacity 0.8)
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;;
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;; Params:
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;; overlay - frame to composite on top
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;; x, y - position to place overlay
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;; opacity - blend amount (0-1)
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;; mode - blend mode (alpha, multiply, screen, etc.)
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(require-primitives "image" "blending" "core")
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(define-effect layer
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:params (
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(overlay :type frame :default nil)
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(x :type int :default 0)
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(y :type int :default 0)
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(opacity :type float :default 1.0)
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(mode :type string :default "alpha")
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)
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(if (core:is-nil overlay)
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frame
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(let [bg (copy frame)
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fg overlay
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fg-w (image:width fg)
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fg-h (image:height fg)]
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(if (= opacity 1.0)
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;; Simple paste
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(paste bg fg x y)
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;; Blend with opacity
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(let [blended (if (= mode "alpha")
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(blending:blend-images (image:crop bg x y fg-w fg-h) fg opacity)
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(blending:blend-images (image:crop bg x y fg-w fg-h)
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(blending:blend-mode (image:crop bg x y fg-w fg-h) fg mode)
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opacity))]
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(paste bg blended x y))))))
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