gramps
6bff21b234
Creator corrected the "loupe" zoom on 2026-10-08: the click anchors a fixed
capture region (box/2 centred on the click) and the box is a live 2x view of
that region — dragging the box never changes its content; it magnifies the
fully-composited frame (every layer, incl. webcam) and draws LAST (n+1).
Rectangle shape is 4:3 ("more of a 640x480 aspect").
- MainViewModel.Zoom.cs rewritten: ActivateZoom anchors CaptureX/CaptureY
(independently clamped); UpdateZoomMove relocates the box only; the per-frame
BuildZoomFrame/ZoomFrameBuilder path is gone.
- SceneCompositor: skips the active ZoomSceneElement in every layer loop and
BlitZooms it last via the new pure ZoomMagnifier (2x bilinear, temp snapshot
via ArrayPool, round clip).
- Preview: ZoomBox hoisted above CanvasGrid as a sibling; its brush samples the
whole composed preview at the fixed capture (2x).
- Tests: ZoomMagnifierTests (box-over-blue shows green capture at 2x incl. an
extra red "layer" — the loupe/backdrop-only regressions both fail it) +
round-clip; ZoomBoxInteractionTests rewritten (anchored capture, move-doesn't-
change-capture, 4:3/9:16/square). 404 pass, 2 known environment flakes.
36 lines
1.7 KiB
C#
36 lines
1.7 KiB
C#
using System.Windows.Media;
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namespace ytLive.Models;
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/// <summary>
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/// The transient zoom layer. It is a real scene element, but a special one: while
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/// active the SceneCompositor draws it LAST (layer n+1, above everything) as a live
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/// 2x view of a FIXED capture window (the box/2 region centred on where the creator
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/// clicked), sampled from the just-composited frame — so it captures ALL layers and
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/// keeps showing the same content no matter where the box is dragged (creator ruling
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/// 2026-10-08). Its X/Y/W/H are the movable BOX placement; CaptureX/CaptureY is the
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/// anchored capture window. While inactive it is an invisible placeholder that is
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/// never persisted (LayoutStore hand-rolls only Source/WebcamSceneConfig rows) — the
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/// VM re-inserts it on load and on scene creation, mirroring how backgrounds heal.
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/// </summary>
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public sealed class ZoomSceneElement : SceneElement
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{
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/// <summary>True only while a zoom box is live; flips Kind so the layer leaves
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/// the baked static base and composites per-frame.</summary>
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public bool IsZoomActive { get; set; }
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/// <summary>Master-space top-left of the fixed capture window. Set once by
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/// <c>ActivateZoom</c>; moving the box must never touch it.</summary>
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public double CaptureX { get; set; }
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public double CaptureY { get; set; }
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public override ElementKind Kind => IsZoomActive ? ElementKind.Dynamic : ElementKind.Static;
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public override bool IsZoomLayer => true;
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public override bool IsDraggable => false;
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/// <summary>Never rendered by the element template or the resolver — the preview
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/// magnifier (ZoomBox) and the output compositor's zoom pass own its pixels.</summary>
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public override ImageSource? DisplaySource => null;
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} |