Allow capturing virtual displays at a lower resolution using
-m/--max-size.
In the original implementation in #5370, the virtual display size was
necessarily the same as the capture size. The --max-size value was only
allowed to determine the virtual display size when no explicit size was
provided.
Since the dpi was scaled down accordingly, it is often better to create
a virtual display at the target capture size directly. However, not
everything is rendered according to the virtual display DPI. For
example, a page in Firefox is rendered too big on small virtual
displays. Thus, it makes sense to be able create a virtual display at a
given size, and capture it at a lower resolution with --max-size. This
is now possible using OpenGL filters.
Therefore, change the behavior of --max-size for virtual displays:
- it does not impact --new-display without size argument anymore (the
virtual display size is the main display size);
- it is used to limit the capture size (whether an explicit size is
provided or not).
This new behavior is consistent with main display capture.
Refs #5370 comment <https://github.com/Genymobile/scrcpy/pull/5370#issuecomment-2438944401>
Refs <https://github.com/Genymobile/scrcpy/pull/5370>
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