We want the Qt backing store to be in the device color
space by default. This will avoid colour space conversions
when blitting it to screen, at the cost of a potential
loss in color accuracy.
As it turns out, CGColorSpaceCreateDeviceRGB no longer
crates a device color space but rather a generic color
space. (Since 10.4). Create the color space with a system
profile instead.
Accurate color representation needs to be supported
at some point, but this fast path should be the
default.
Change-Id: I7ebb77b36f81f66119d8c2ef464723401ec1d1e8
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
9650a5aa25