- factor out native_byte_order determination
- fix ExpandMap[] when client X image byte order is different than host's
  e.g. { mips, ppc } -> x86 in 8 bpp mode

Much improved responsiveness on NetBSD systems.

On those systems, it's really hard to get high resolution timings and the
system oftens fails to honour a timeout in less than 20 ms. The idea here
is to have an average m68k instruction count (countdown quantum) that
triggers real interrupt checks. The quantum is calibrated every 10 ticks
and has a 1000 Hz resolution on average.

Enable multiple depths in fullscreen DGA modes, i.e. add 1-bit to 16/32-bit
blitters, rewrite update_display_dga_vosf() to actually work with sub byte
pixels. Factor out update_display_window_vosf() since it's long time that
it is no longer checking for first column and last column that have changed.

Happy New Year!

lock X11 display better around update_display_window_vosf()

Enable 33-bit memory addressing on 64-bit JIT capable platforms (e.g. x86-64).
This is useful to get rid of address offset sign extensions. It uses POSIX
shared memory to create aliased regions, fallback to usual sign-extension
way if shm_open et al. don't work (e.g. no /dev/shm mounted)

Happy New Year! :)

- Let fullscreen DGA mode work again, even with a DirectColor visual. In
  that case, we do need add it when creating the window otherwise we
  result int a nice BadMatch for X_CreateWindow request. FIXME?
- Fix typo and do enable VOSF in DGA mode, if necessary.

- added infrastructure for multi-monitor support; only video_x.cpp is
  converted for the new scheme; not actually tested with a mult-monitor
  setup yet but at least single-monitor display doesn't seem to be broken
  (UAE banked addressing would definitely require some extensions to handle
  multiple frame buffers)
- struct video_mode has an extra field that is free for use by platform-
  specific code

cleaned up pthread attributes [Brian Johnson]

- video_x.cpp: the_buffer shall always be mapped through vm_alloc() so
  that it can be vm_protect()'ed at will afterwards
- video_x.cpp: let driver_base free() the_buffer_copy and the_host_buffer,
  if necessary
- video_vosf.h: reverted to use malloc() for mainBuffer.dirtyPages and
  mainBuffer.pageInfo
- vm_alloc.cpp: small cleanups
- fixed typos

fixed a couple of compiler warnings

- background_pixel, border_pixel and colormap attributes of window are now
  always set as this seems to be required for non-default visuals

- added video_vosf_init()/video_vosf_exit() for initialization and destruction
  of the internal structures used for the VOSF system
- use vm_acquire()/vm_release() for VOSF buffers and hope the_buffer is
  allocated above RAM address space (temporary workaround for 64-bit
  addressing systems)
- don't free() screen buffers in driver_base dtor
- don't free() memory mapped buffers in driver_base dtor

added support for 2/4-bit modes on 8-bit visuals

- improved compatibility of multiple depth/resolution handling with versions
  of MacOS before 7.6:
   - Apple mode IDs are now allocated contiguously from 0x80 (the video_*.cpp
     module must call video_init_depth_list() after adding all modes)
   - if the video driver didn't receive a GetVideoParameters call, it patches
     ScrnBase and the main GDevice upon a video mode switch (otherwise MacOS
     will continue to use the old frame buffer base)
   - the rowBytes values in the video parameters slot resources are correct
     for all bit depths

- video_set_palette() gets passed the number of used palette entries
- video_x.cpp supports 2- and 4-bit modes on truecolor screens

- sony.cpp/disk.cpp/cdrom.cpp use vector<> of drive_info objects instead of
  linked list
- color depth switching updates slot ROM
- video_x.cpp always supports 1-bit window modes
- timer_create()/clock_gettime() are pulled from librt if present

gamma tables work with X11

- experimental gamma table support
- restructured video_x.cpp: uses classes for display types

video_x.cpp supports resolution switching in windowed mode: the available
resolutions are 512x384, 640x480, 800x600, 1024x768 and 1280x1024 (the prefs
editor has to be updated to reflect this). The resolution selected in the
prefs editor is used as the default, but it can be changed in the Monitors
control panel. So far only tested with direct addressing.

added infrastructure for resolution/depth switching (currently, all video
drivers only support one mode, the one selected by the user)

- new and updated SIGSEGV support functions:
  + configure script cleanups
  + possible support for Direct Addressing / VOSF on other platforms

Mainly changes to the VOSF code:
- improved blitters selection
- improved blitters performance if UNALIGNED_PROFITABLE is set
- cleaned up 8 bpp blitters

- Cleaned up the process for determining the ranges of pages touched
  that have to be blitted onto the screen (find_next_page_set() and
  find_next_page_clear() functions)
- Cleaned up some comments
Changes from Brian J. Johnson
- Fixed mainBuffer.dirtyPages[] array overrun in VOSF code
- Fixed calculation of the frames-per-second value

- removed the INT16 prefs item type; use INT32 instead
- AmigaOS/Unix: it's now possible to specify preferences items on the
  command line
- Unix: command line options now take "--"-prefix, e.g. "--rominfo"

window close widget now maps to Mac "power" key

removed unnecessary window attributes

video_x.cpp: window asks for input focus with XSetWMHints()

- added a few more emulated privileged instructions to NetBSD/m68k
- tried to make VOSF run under NetBSD/m68k, little success (shows stripes and
  sometimes crashes)

added SA_SIGINFO to sa_flags when sa_sigaction is used

- cleaned up Expose event handling with VOSF

- improved timing of periodic threads

- DGA and SHM are only tried on local X11 displays
- re-integrated old window update method (better performance over a networked
  display connection), frameskip=0 selects new method, other values select
  old method
- fixed compilation errors

- updated copyright info: 1999->2000

*** empty log message ***

- added mouse wheel support

- added fbdev DGA preferences to GTK prefs editor

- disabled X backing store

- improved configuration and installation

- renamed basilisk_ii_keycodes to keycodes
- default location of keycodes file is now $(sharedir)/keycodes
  (depends on install prefix)
- improved the install target