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overlay: allow to draw both/either of filled/outlined rectangle

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Filled/outlined rectangles shown as snapping overlay are now enabled/disabled
independently with `snapping.overlay.[region|edge].bg.enabled` and
`snapping.overlay.[region|edge].border.enabled`.

To keep the default behavior, `*.bg.enabled` is yes and `*.border.enabled` is
no for hardware-based renderers, while `*.bg.enabled` is no and
`*.border.enabled` is yes for software-based (pixman) renderer.

Users can now use a filled rectangle as an overlay even with pixman renderer.
However, this may severely impact performance when used with translucent
`snapping.overlay.[region|edge].bg.color`.

This commit includes a refactor to use substruct `theme_snapping_overlay`
inside `theme` in order to pass it to `create_overlay_rect()` in a cleaner way.

Breaking changes is:
- `snapping.overlay.[region|edge].fill` is now removed.
This commit is contained in:
tokyo4j 2024-04-21 02:30:31 +09:00 • committed by Johan Malm
parent 34290ef629
commit b0ba585ff8
9 changed files with 160 additions and 122 deletions
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22
docs/labwc-theme.5.scd
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@ -210,15 +210,25 @@ elements are not listed here, but are supported.
Height of boxes in workspace switcher in pixels. Setting to 0 disables
boxes. Default is 20.
*snapping.overlay.region.fill* [yes|no]
*snapping.overlay.region.bg.enabled* [yes|no]
Show a filled rectangle as an overlay when a window is snapped to a region.
Otherwise, an outlined rectangle is shown instead.
If software rendering is used, an outlined rectangle is always shown.
Default is yes for hardware-based renderers and no for software-based
renderers.
*snapping.overlay.edge.fill* [yes|no]
*snapping.overlay.edge.bg.enabled* [yes|no]
Show a filled rectangle as an overlay when a window is snapped to an edge.
Otherwise, an outlined rectangle is shown instead.
If software rendering is used, an outlined rectangle is always shown.
Default is yes for hardware-based renderer and no for software-based
renderers.
*snapping.overlay.region.border.enabled* [yes|no]
Show an outlined rectangle as an overlay when a window is snapped to a
region. Default is no for hardware-based renderers and yes for software-based
renderers.
*snapping.overlay.edge.border.enabled* [yes|no]
Show an outlined rectangle as an overlay when a window is snapped to an edge.
Default is no for hardware-based renderer and yes for software-based
renderers.
*snapping.overlay.region.bg.color*
Color of a filled rectangle shown as an overlay when a window is snapped to