`screen_id`; `monitor_id` element was added. Made use of
`screen_id` and `monitor_id` where it's appropriate.
* Removed `screen` parameter from methods which contains it in name.
Methods were renamed to remove `Screen` and `FromScreen`.
* Source/x11/XGServerWindow.m (screenList): change with assumption
that Xlib screen is one per application.
Failback code to RandR-related always creates arrays with one element
(no enumeration needed). Create `monitor` structure in failback (non-RandR)
code. Use `screen_id` MonitorDevice structure element to hold Xlib screen
ID.
(windowDepthForScreen:): assume that `screen` parameter is a Xlib screen ID,
simplify code - `screen` will be used with RandR or not.
(availableDepthsForScreen:): changed with assumption that `screen` is a index
of element in `monitors` structure.
* Source/x11/XGServer.m (_initXContext): initialize `monitors` array
early here before first use (calls to XGServerWindow methods).
- Added support for 32 bit surfaces when it's possible (use of Xrender extension..).
- Modified the Cairo backend to take advantage of that: we can now draw windows with partial transparency.
- Fixed a bug in the Cairo backend (copy of a surface to itself) using the cairo "groups". Scrolling is still wrong, but we're closer to something good ;-)
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@25441 72102866-910b-0410-8b05-ffd578937521
