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Merges full history from art-dag/mono.git into the monorepo under the artdag/ directory. Contains: core (DAG engine), l1 (Celery rendering server), l2 (ActivityPub registry), common (shared templates/middleware), client (CLI), test (e2e). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> git-subtree-dir: artdag git-subtree-mainline:1a179de547git-subtree-split:4c2e716558
32 lines
1.0 KiB
Common Lisp
32 lines
1.0 KiB
Common Lisp
;; Blend effect - combines two video frames
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;; Streaming-compatible: frame is background, overlay is second frame
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;; Usage: (blend background overlay :opacity 0.5 :mode "alpha")
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;;
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;; Params:
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;; mode - blend mode (add, multiply, screen, overlay, difference, lighten, darken, alpha)
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;; opacity - blend amount (0-1)
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(require-primitives "image" "blending" "core")
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(define-effect blend
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:params (
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(overlay :type frame :default nil)
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(mode :type string :default "alpha")
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(opacity :type float :default 0.5)
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)
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(if (core:is-nil overlay)
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frame
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(let [a frame
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b overlay
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a-h (image:height a)
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a-w (image:width a)
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b-h (image:height b)
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b-w (image:width b)
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;; Resize b to match a if needed
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b-sized (if (and (= a-w b-w) (= a-h b-h))
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b
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(image:resize b a-w a-h "linear"))]
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(if (= mode "alpha")
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(blending:blend-images a b-sized opacity)
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(blending:blend-images a (blending:blend-mode a b-sized mode) opacity)))))
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