Everyone else seems to get by with using 0600, so let's do the same.

It's not enough that we detach from the shared memory, we must also
tell the X server to do so for it to be freed properly.

This will allow us to render more things than just the framebuffer.

The complex logic waiting for events didn't result in any added
performance, so use the simpler approach.

We need to make sure the display server has finished reading our
previous update before we overwrite the buffer with the next update.

The damage tracking region needs to be protected from multiple
threads accessing it at once. The rest should be fine though.

This avoid a lot of unnecessary middle men. This also pushes the
responsibility for pixel format conversion into the encoders and
decoders. The new bufferFromBuffer() is used for direct conversion,
rather than PixelTransformer/TransImageGetter.

It was confusing and not properly used everywhere.
Callers should use the stride they get when they get
the buffer pointer.

This allows us to gracefully fall back to the FLTK code in case the
platform specific code cannot be used.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@589 3789f03b-4d11-0410-bbf8-ca57d06f2519

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/branches/merge-with-vnc-4.1.1@522 3789f03b-4d11-0410-bbf8-ca57d06f2519

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519