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Now that the WindowServer's menu is the primary way to start apps,
it is especially noticable that it leaks the /dev/fb0 fd to the apps
that it spawns. Fix that by opening it with O_CLOEXEC.
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The code was already trying to do this, but it was centering inside the
screen rect before we had a screen rect. :^)
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The main changes are twofold:
* Buffer flipping is now controlled by the m_screen_can_set_buffer flag
in WSCompositor. This flag, in turn, is impacted by m_can_set_buffer
flag, in WSScreen. m_can_set_buffer is set in the WSScreen constructor
by checking the return value of fb_set_buffer. If the framebuffer
supports this operation, it will succeed, and we record this fact. This
information is then used by WSCompositor to set its own
m_screen_can_set_buffer flag.
* WSScreen now only requests a resolution change of the framebuffer. The
driver itself is ultimately responsible for what resolution or mode is
actually set, so WSScreen has to read the response from that request,
and has no choice but to accept the answer. This allows the driver to
choose a "close enough" value to what was requested, or simply ignore
it.
The result of this is that there is no special configuration necessary
for WindowServer to work with reduced-capability framebuffer devices.
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This is to prepare for other framebuffer implementations, for which it
would be inappropriate to use the /dev/bxvga device name.
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The only reason for the inheritance was to add FDs to the select set.
Since CNotifier is available (and now also quite useful), we can make use of it
instead, and remove the inheritance.
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This is far from finished and the two classes are awkwardly grabbing at each
other's innards, but here's a first step in the right direction.
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The wheel events will end up in GWidget::mousewheel_event(GMouseEvent&)
on the client-side. This patch also implements basic wheel scrolling in
GScrollableWidget via this mechanism. :^)
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This was needed back when pressing the left button would cause the cursor
to switch colors.
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Since I'm on a roll here, I'll just rename WSMessageFoo to WSEventFoo now
that these inherit from CEventFoo anyway.
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This was pretty straightforward thanks to the work I did separating out
LibCore from LibGUI already. :^)
- WSMessageLoop now inherits from CEventLoop.
- WSMessage now inherits from CEvent.
- WSMessageReceiver goes away.
Now there is only one event loop in Serenity. Very nice!
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