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Zoom: compose the box as a real 2x layer above the background (Unit: zoom layer + magnification proof)

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Right-click now creates a transient ZoomSceneElement at z-index 1 whose pixels are a
genuine 2x magnified sample of the backdrop (live capture under art), composited into
stream/recording like any layer while the output crop stays the tier. All shapes are
centered on the click and clamped to frame; healed on load/scene-create, never persisted,
hidden from the layers list + element template (IsZoomLayer). BuildCompositorOptions is
now internal = always tier crop (test seam). ZoomFrameBuilder is a pure static sampler
(box/2 window centered on the box center, single-slot cache) proven by a banded-backdrop
test; LayerReorderPersistenceTests drag resolves rows by item since the collapsed zoom
row shifts container indices. Also books TASK 51 (webcam background Remove + Blur) and
syncs memory docs (HANDOFF, MyMistakes, indexes). Full suite: 405 passed, 0 warnings.
This commit is contained in:
gramps
2026-10-07 23:39:54 -07:00
parent 966e718f1e
commit 4b3d82ff0f
17 changed files with 734 additions and 210 deletions
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Controls/PreviewPane.xaml.cs
+10 -3
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@@ -553,8 +553,15 @@ public partial class PreviewPane : UserControl
if (DataContext is not MainViewModel vm) return;
if (vm.IsZoomActive && ZoomVisualBrush != null)
{
ZoomVisualBrush.Visual = CanvasGrid;
ZoomVisualBrush.Viewbox = new Rect(vm.ZoomState.X, vm.ZoomState.Y, vm.ZoomState.Width, vm.ZoomState.Height);
// The preview mirrors the output zoom layer: sample the backdrop layer
// (the live capture + art, exactly what the compositor magnifies) at the
// box/2 interior centered on the box center → 2x on the screen.
ZoomVisualBrush.Visual = BackdropLayer;
ZoomVisualBrush.Viewbox = new Rect(
vm.ZoomState.X + vm.ZoomState.Width / 4,
vm.ZoomState.Y + vm.ZoomState.Height / 4,
vm.ZoomState.Width / 2,
vm.ZoomState.Height / 2);
ZoomVisualBrush.ViewboxUnits = BrushMappingMode.Absolute;
if (vm.ZoomShape == Models.ZoomShape.Circle)
{
@@ -569,7 +576,7 @@ public partial class PreviewPane : UserControl
ZoomBox.Clip = null;
}
}
else if (!vm.IsZoomActive && ZoomVisualBrush != null && ReferenceEquals(ZoomVisualBrush.Visual, CanvasGrid))
else if (!vm.IsZoomActive && ZoomVisualBrush != null && ReferenceEquals(ZoomVisualBrush.Visual, BackdropLayer))
{
ZoomVisualBrush.Visual = null;
}