graphics/nxbe/nxbe_bitmap.c: Fix another coordinate system problem.
graphics/: Review use of device coordinate system with window frambebuffer and make fixes accordingly.
graphics/nxbe/nxbe_fill.c: Fix a coordinate system bug. Was trying to update the window fraembuffer using the device coordinate system. Need to use the relative coordinate system.
graphics/: Use DEBUGASSERT instead of return an error since the is no user to handle the errors within the NX server. Use CONFIG_DEBUG_GRAPHICS instead of CONFIG_DEBUG_FEATURES in most cases.
graphics/: Nothing under graphics/ should set the errno.
Squashed commit of the following:
Update TODO list
graphics/nxbe: The moverectangle renderer now supports updates to the per-window framebuffer (unclipped) as well as the graphics device memory (clipped).
graphics/nxbe: The filltrapezond renderer now supports updates to the per-window framebuffer (unclipped) as well as the graphics device memory (clipped).
graphics/nxbe: The getrectangle method now returns data from the per-window framebuffer if available.
graphics/nxbe: The fillrectangle renderer now supports updates to the per-window framebuffer (unclipped) as well as the graphics device memory (clipped).
graphics/nxmu: If a window supports a per-window framebuffer, then redraw callbacks are suppressed and the device content is updated from the shadow, per-window framebuffer. graphics/nxbe: The copyrectangle renderer now supports updates to the per-window framebuffer (unclipped) as well as the graphics device memory (clipped).
graphics/nxbe/nxbe_setsize.c: Reallocate the per-window framebuffer when the window size changes.
Gregory Nutt