[Patch by Mike Sliczniak]
I was testing some other SS patches and I noticed that when I ran an X11
build of SS there were not all the video modes I expected in the the
control strip. Mac OS X 10.5 changed the form of the DISPLAY environment
variable. The reason for this is that the DISPLAY variable looks like
this in Leopard:

/tmp/launch-XXXXXX/:0

The Xs are like in mktemp.

Use semaphores to suspend the redraw thread while switching video mode.

NQD dirty boxes, generic code
+ while we are at it, also rename a few NQD related NativeOps.

Direct Color visual is OK for fbdev dga.

Include <sys/mman.h> for fbdev dga without VOSF acceleration.

Better lock and zero VOSF data, especially for DGA mode. Also make sure
that we really update the whole screen when sub-8bpp modes are used

Handle "screen fbdev/WIDTH/HEIGHT" to force use of FBDev DGA instead of XF86
DGA mode. In other words, root user can now use FBDev DGA though it's always
recommended to run SheepShaver with a normal user. Increase "ramsize" bounds
in the GUI and fully migrate to new "screen" modes. Remove "windowmodes" and
"screenmodes" defaults.

Implement screen win/WIDTH/HEIGHT prefs item that overrides any other value
for windowmodes and screenmodes. Necessary for arbitrary full screen mode
sizes.

Happy New Year 2005!

Implement Direct Addressing mode similarly to Basilisk II. This is to get
SheepShaver working on OSes that don't support maipping of Low Memory globals
at 0x00000000, e.g. Windows.

Better hardware cursor mapping from SDL code.

Force use of MacX mappings on MacOS X with Apple's X server.

Merge event2keycode() from Basilisk II, aka. make Option key mapped to
Mode_Switch work as real option key. Merge caps_on handling from B2 too.

When no fullscreen mode requested nor available, always try to pick the
first windowed mode matching current depth.

Use memmove() in NQD_bitblt() in order to avoid possible overlaps

Disable MacOS -> X11 copying of cursor in windowed mode too. You can
recompile with "mac_cursor_enabled" constant set to true. Disabling it
causes a better looking cursor that is not "disappearing" sometimes with
e.g. Microsoft Internet Explorer.

NQD: use ReadMacInt*() and WriteMacInt*() accessors, i.e. code should now
be little-endian and 64-bit safe.

Constrain NQD to powerpc (32-bit big endian) at this time

Fix DGA mode for emulated PPC targets. It currently doesn't work in native
mode as the stack is corrupted and we are jumping to garbage when moving
the mouse. Also add 1152x768 resolution from PBG4, but make timing match
the 1152x870 version.

Cleanups, further merges from Basilisk II tree.

Merge run-time depth switching code from Basilisk II.

Happy New Year! :)

Handle copy-paste between X11 and MacOS. X11 events handling code has to
be improved in copy mode (when we own the selection to service other clients).
Also note that older klipper has a tendency to request clipboard data
several times per second.

We do need <pthread.h> in any case, especially native Linux/PPC

fix shm screen image allocation.

Import VOSF from Basilisk II for faster and more accurate video refresh.
There may be some bugs left though. Rework sigsegv_handler() a little to
accomodate VOSF way of life.

TODO: merge video drivers infrastructure from B2.

Imported sources