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Dissociate virtual display size and capture size

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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>
This commit is contained in:
Romain Vimont
2024-11-20 13:01:57 +01:00
parent 4608a19a13
commit daba00a819
7 changed files with 35 additions and 24 deletions
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app/scrcpy.1
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@@ -318,14 +318,13 @@ Disable video and audio playback on the computer (equivalent to \fB\-\-no\-video
.TP
\fB\-\-new\-display\fR[=[\fIwidth\fRx\fIheight\fR][/\fIdpi\fR]]
Create a new display with the specified resolution and density. If not provided, they default to the main display dimensions and DPI, and \fB\-\-max\-size\fR is considered.
Create a new display with the specified resolution and density. If not provided, they default to the main display dimensions and DPI.
Examples:
\-\-new\-display=1920x1080
\-\-new\-display=1920x1080/420
\-\-new\-display # main display size and density
\-\-new\-display -m1920 # scaled to fit a max size of 1920
\-\-new\-display=/240 # main display size and 240 dpi
.TP