The symbol CGColorSpaceCopyICCData() is only available on macOS 10.12
and higher. We want GIMP to run from 10.9 onwards, so use the older
symbol CGColorSpaceCopyICCProfile() even though this one is deprecated.
Quartz/macOS implementation for the color picker.
This is untested but I am trying to advance our 2.10 blockers by
implementing the base code for this feature. Please anyone with macOS
machine access, review and fix if needed!
Though forward declarations of the implementations are ok, it is cleaner
to have proper header files for each variant (default, kwin, quartz
right now). Of course these new header files are not installed and must
be kept private for build only.
The common code relies on X11 pointer grabbing semantics, which does
not work well on OS X. An attempt using event taps also proved
problematic, in particular with regard to setting the mouse cursor.
This patch implements a fully separate code for use on OS X platforms.
It works by simply overlaying the desktop with big transparent windows
on which the mouse cursor is set and motion events are captured. Evil,
but it works.
