[Wayland-bugs] [Bug 744932] Wrong (ultra tiny/small) cursor size on HiDPI screen

[mutter (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744932

Jonas Ådahl <jadahl at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #307725|0                           |1
        is obsolete|                            |

--- Comment #82 from Jonas Ådahl <jadahl at gmail.com> ---
Created attachment 309538
  --> https://bugzilla.gnome.org/attachment.cgi?id=309538&action=edit
Support scaling of cursor sprites given what output they are on

This commits refactors cursor handling code and plugs in logic so that
cursor sprites changes appearance as it moves across the screen.
Renderers are adapted to handle the necessary functionality.

The logic for changing the cursor sprite appearance is done outside of
MetaCursorSprite, and actually where depends on what type of cursor it
is. In mutter we now have two types of cursors that may have their
appearance changed:

 - Themed cursors (aka root cursors)
 - wl_surface cursors

Themed cursors are created by MetaScreen and when created, when
applicable(*), it will extend the cursor via connecting to a signal
which is emitted everytime the cursor is moved. The signal handler will
calculate the expected scale given the monitor it is on and reload the
theme in a correct size when needed.

wl_surface cursors are created when a wl_surface is assigned the
"cursor" role, i.e. when a client calls wl_pointer.set_cursor. A
cursor role object is created which is connected to the cursor object
by the position signal, and will set a correct texture scale given what
monitor the cursor is on and what scale the wl_surface's active buffer
is in. It will also push new buffers to the same to the cursor object
when new ones are committed to the surface.

This commit also makes texture loading lazy, since the renderer doesn't
calculate a rectangle when the cursor position changes.

* when we are running as a Wayland compositor

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