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feat(blur): a privacy blur layer for the Live scene — boxes and circles over the desktop

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Creator request 2026-11-01: a layer that hides part of the desktop from viewers. Box or circle,
drag/resize like any layer, one strength slider, several allowed.

**Z-order is policy, not preference.** `AddSource` inserts a blur directly above the background
and therefore below the brand logo, and `OnSceneElementsReordered` pushes any blur that ends up
above the brand back down. Nothing else in the app can move it into the brand's way.

**Overlap = the strongest single blur, never a stack.** `SceneCompositor.ApplyBlurLayers` collects
every visible blur the first time one is reached in the z-order, sorts them strongest-first, and
shares one coverage map: a pixel already covered by a stronger blur is skipped. Blurring
back-to-front would have produced something stronger than any slider setting allows, which is
exactly what was ruled out.

**One blur curve, shared with the webcam.** `RegionBlur` carries the constants the webcam blur
already used — downscale 4, radius 1–6 downscaled px, `RadiusFor(strength)` — and
`BackgroundEffectProcessor` now delegates to it instead of holding its own copy. The layer's
slider is the same 0–1 scale with the same 0.5 default, so "half strength" means the same blur in
both features. Cost is proportional to the blur's own rect, not the frame.

**Live scene only**, enforced in `AddSource` as well as the (+) menu (`CanAddBlur`), so a stale
menu item or a scripted call cannot plant one on BRB. `ElementKind.Dynamic`, so it is never baked
into the static base and every render path gets it — pump, preview, thumbnails, scene dump.

Persistence: `Source.BlurAmount` column + migration; shape rides the existing `ClipShape`.
Properties panel: Box | Circle plus the strength slider, gated on `IsBlurSelected`.

4 tests: outside the mask is byte-identical, inside loses its hard edges, a circle leaves its
box corners alone, and two identical stacked blurs equal one (the coverage map). Release builds
at 0 warnings.
This commit is contained in:
gramps
2026-11-01 09:55:04 -08:00
parent 2e12c5651e
commit 71d0e87cac
14 changed files with 534 additions and 23 deletions
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Controls/LeftPanel.xaml
+32
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@@ -82,6 +82,11 @@
<MenuItem Header="Stream Alerts" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.AlertBox}"
IsEnabled="{Binding CanAddAlerts}"
ToolTip="Celebration zone for Super Chat &amp; memberships — one alert layer at a time"/>
<!-- Privacy blur: Live scene only (creator ruling 2026-11-01). Sits
above the desktop and below the brand logo; several allowed. -->
<MenuItem Header="Blur" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.Blur}"
Visibility="{Binding CanAddBlur, Converter={StaticResource BoolToVis}}"
ToolTip="Hide part of your desktop from viewers — box or circle"/>
</ContextMenu>
</Button.ContextMenu>
<Path Data="M12,4 L12,20 M4,12 L20,12" Stroke="{StaticResource Brush.Tertiary}" StrokeThickness="2"
@@ -339,6 +344,33 @@
</ToggleButton>
</StackPanel>
</StackPanel>
<!-- Privacy blur (creator ruling 2026-11-01): a shape choice and one
strength slider, on the SAME 0–1 scale and default as the
webcam's background blur — one radius curve, shared. -->
<StackPanel Visibility="{Binding IsBlurSelected, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
<TextBlock Text="Blur" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,4"/>
<StackPanel Orientation="Horizontal" Margin="10,0,0,6">
<ToggleButton Style="{StaticResource SegmentToggle}" Padding="10,4"
IsChecked="{Binding SelectedElement.IsRectShape, Mode=TwoWay}">
<TextBlock Text="Box" Style="{StaticResource SegmentLabel}"/>
</ToggleButton>
<ToggleButton Style="{StaticResource SegmentToggle}" Padding="10,4" Margin="4,0,0,0"
IsChecked="{Binding SelectedElement.IsRoundShape, Mode=TwoWay}">
<TextBlock Text="Circle" Style="{StaticResource SegmentLabel}"/>
</ToggleButton>
</StackPanel>
<DockPanel Margin="10,0,0,4">
<TextBlock DockPanel.Dock="Right" Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="11" VerticalAlignment="Center" Margin="8,0,0,0" Width="34">
<Run Text="{Binding SelectedElement.BlurAmount, Mode=OneWay, StringFormat={}{0:P0}}"/>
</TextBlock>
<Slider Minimum="0" Maximum="1" SmallChange="0.05" LargeChange="0.1"
Value="{Binding SelectedElement.BlurAmount, Mode=TwoWay}"
VerticalAlignment="Center"/>
</DockPanel>
<TextBlock Text="Strongest blur wins where they overlap — layers cannot add up."
Foreground="{StaticResource Brush.OnSurfaceVariant}" FontSize="10" TextWrapping="Wrap" Margin="10,2,0,0"/>
</StackPanel>
<!-- The drag hint sits under the shape row — indented, so the
parentage shows. -->
<TextBlock Text="Drag to move · drag the corner dot to resize"