The scroll bar always spans the content area of the screen: the
position and height depend only on the theme and not on who is
drawing it.
Note that the coordinates passed were wrong in most cases, so this
commit fixes the scroll bar positioning for several dialogs.
Initialize in constructor and clean up in destructor instead of having separate init() and deinit() methods.
Don't close file descriptor if open failed (ts_fd == -1).
Renamed initialized() to available(), since it tests whether the touch screen was found, not whether an initialization was attempted.
Improved code layout and minor other cleanups.
There was a lot of gp2x-specific code which was built for
all platform. For instance, the code was compiled for all
the platforms with the constant "TARGET_GP2X" defined.
This obviously had to be fixed.
Instead of having the copy constructor convert to display format, the new
copy constructor preserves the pixel format and a separate method was
introduced to convert surfaces to display format.
The code was made more robust as well: it should no longer crash if the
wallpaper cannot be loaded.
