Windowed mode presentation is changed to use a series of blits clipped to
each top level window to work around performance issues when a clipper uses
a clip list instead of a window. Otherwise DirectDraw uses StretchBlt rather
than the driver Present call even if the clip list is a single rectangle
matching the window client area.
Fixes a performance issue reported in issue #24.
8/16 bit display mode emulation is now implemented internally instead of
relying on the builtin Windows shims, as those are sometimes unreliable
(not triggering for some games on some systems when they should).
External DirectDraw hooks (such as the DWM8And16BitMitigation shim)
are disabled to avoid interference.
Fixes issues reported in #8, #9, #15.
DirectDraw does not properly update the clip lists of IDirectDrawClipper
objects that are using window handles. (Probably it only tracks child window
changes and not other overlapping windows when composition is enabled).
Clip lists are now manually calculated and updated on window position
changes instead.
Fixes "invisible" GDI windows in O2Jam (issue #9).
On recent drivers, double buffered DirectDraw flips no longer wait for the
vertical sync before returning and instead just insert the flip into the
flip queue for later execution. This effectively results in triple buffered
behavior (in the render-ahead sense) and causes up to an extra frame of
latency even if the flip queue size is set to 1.
To restore the legacy double buffered behavior, each flip waits for the
presented frame to leave the flip queue before returning.
To restore the legacy triple buffered behavior, the flip queue size is
forced to 1. This causes the flip to wait if the previous flip is still
pending.
