Paint styles
Gradients, brushes, per-corner radii, per-edge borders, border styles and layered shadows.
Fluent styles support bg_gradient(angle, stops), bg_fill(brush),
rounded_corners(Corners), border_edges(Insets), border_style(BorderStyle)
and shadows(...). Angles use clockwise radians. Gradient endpoints scale with
the allocated box; pattern brush spacing is expressed in logical pixels.
These compose with hover/focus/reactive styles and ordinary view children.
bg(color) clears a previously selected gradient/pattern; rounded(radius)
clears per-corner overrides; border(width) clears independent edge widths;
shadow and shadow_none clear the multiple-shadow override. Corners normalize
when their adjacent radii would exceed the box size. Borders paint inside their
allocation. Shadows contribute to damage and retained-layer extents.
Ordinary rounded rectangles keep the existing GPU shader path. Detailed backgrounds/borders use the bounded device-scale canvas raster cache; unchanged style and geometry reuse both paths and pixels. Shadows remain analytic GPU quads, with per-corner radii and at most 32 shadows per panel. The software reference follows the same geometry. Gradients and dashed borders are validated by the renderer; malformed values return a GPU rendering error.
The paint styles example shows asymmetric corners and borders, two shadows, a resizable gradient, and a dashed patterned card. GPU tests compare partial and fresh full frames through style changes and shadow removal, including isolated layers and cache release.
cursor(Cursor::Grab) and the other platform-independent cursor variants work on
any view, including passive and disabled regions. Explicit cursor styles inherit
through visual ancestors and override the host’s automatic control cursor.
Cursor changes update input geometry without layout or paint damage. The native
host caches the geometric query between pointer/geometry changes; ordinary scenes
without custom cursors avoid that query entirely.