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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
45 lines
1.8 KiB
Common Lisp
45 lines
1.8 KiB
Common Lisp
;; Feathered blend - blend two same-size frames with distance-based falloff
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;; Center shows overlay, edges show background, with smooth transition
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(require-primitives "xector")
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(define-effect xector_feathered_blend
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:params (
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(inner-radius :type float :default 0.3 :range [0 1] :desc "Radius where overlay is 100% (fraction of size)")
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(fade-width :type float :default 0.2 :range [0 0.5] :desc "Width of fade region (fraction of size)")
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(overlay :type frame :default nil :desc "Frame to blend in center")
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)
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(let* (
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;; Get normalized distance from center (0 at center, ~1 at corners)
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(dist (dist-from-center frame))
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(max-dist (βmax dist))
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(dist-norm (α/ dist max-dist))
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;; Calculate blend factor:
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;; - 1.0 when dist-norm < inner-radius (fully overlay)
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;; - 0.0 when dist-norm > inner-radius + fade-width (fully background)
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;; - linear ramp between
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(t (α/ (α- dist-norm inner-radius) fade-width))
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(blend (α- 1 (αclamp t 0 1)))
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(inv-blend (α- 1 blend))
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;; Background channels
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(bg-r (red frame))
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(bg-g (green frame))
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(bg-b (blue frame)))
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(if (nil? overlay)
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;; No overlay - visualize the blend mask
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(let ((vis (α* blend 255)))
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(rgb vis vis vis))
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;; Blend overlay with background using the mask
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(let* ((ov-r (red overlay))
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(ov-g (green overlay))
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(ov-b (blue overlay))
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;; lerp: bg * (1-blend) + overlay * blend
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(r-out (α+ (α* bg-r inv-blend) (α* ov-r blend)))
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(g-out (α+ (α* bg-g inv-blend) (α* ov-g blend)))
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(b-out (α+ (α* bg-b inv-blend) (α* ov-b blend))))
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(rgb r-out g-out b-out)))))
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