Igor, I'm a huge fan of the lib- and to answer your question, I believe there is an updated version of the bitmap function, however it is not in the version of the lib (5.91 with audio) that's there for download... I think the "current" beta revision for R6.0 (or whatever) can be compiled from the code repository.
It's got some really great improvements on an already AWESOME lib, I personally can't wait for the next Rev to hit the distro... the next rev also fixes some issues like incompatability with serial I/O which has been pesky for me and a couple of things I've wanted to do with the lib. Since I post my projects, I'm (painfully) avoiding using any of the new code or features until the new rev is officially out there. Coding from a modified lib... begs for problems.
New toys to play with coming... c'mon Santa, bring me a fresh lib to diddle with, and bring it early...
ALSO:
In another thread, I was discussing image processing from NTSC video input, and it ocurred to me that the reverse of this library ought to be possible- without even a sync separator chip, with two digital lines using set-point resistors (two step resistor ladder), you should be able to do monochrome video digitization- average luma level below logic threshold yields zero, above yields one. If using a high-contrast background to foreground, it's all just a matter of voltage level timing since the vsync pulse. One digital input is set for the sync pulse level, and the other for the black to white threshold level. Got any thoughts on this?