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Add screen magnifier

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This adds a screen magnifier which can be controlled with the
`ZoomIn` / `ZoomOut` and `ToggleMagnify` actions.

It scales up part of the rendered framebuffer so the magnification
may end up looking blurry depending on the magnification scale.

PR #1774
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Simon Long 2024-05-15 23:07:23 +01:00 • committed by GitHub
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docs/labwc-config.5.scd
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@ -909,6 +909,39 @@ situation.
option has been exposed for unusual use-cases. It is equivalent to
Openbox's `<hideDelay>`. Default is 250 ms.
## MAGNIFIER
```
<magnifier>
<width>400</width>
<height>400</height>
<initScale>2</initScale>
<increment>0.2</increment>
<useFilter>true</useFilter>
</magnifier>
```
*<magnifier><width>*
Width of magnifier window in pixels. Default is 400.
Set to -1 to use fullscreen magnifier.
*<magnifier><height>*
Height of magnifier window in pixels. Default is 400.
Set to -1 to use fullscreen magnifier.
*<magnifier><initScale>*
Initial number of times by which magnified image is scaled. Value
is the default at boot; can be modified at run-time in a keyboard
or mouse binding by calling 'ZoomIn' or 'ZoomOut'. Default is x2.0.
*<magnifier><increment>*
Step by which magnification changes on each call to 'ZoomIn' or
'ZoomOut'. Default is 0.2.
*<magnifier><useFilter>* [yes|no|default]
Whether to apply a bilinear filter to the magnified image, or
just to use nearest-neighbour. Default is true - bilinear filtered.
## ENVIRONMENT VARIABLES
*XCURSOR_THEME* and *XCURSOR_SIZE* are supported to set cursor theme