With GTK+3, high or low density is taken care by the screen scale
factor. Having a separate preferences for this is redundant, and likely
even wrong.
It may be interesting though to have a new preference later, which would
allow smaller scale icon sizing since some people like their icon
slightly smaller or bigger, and also when you are using screens whose
density is at a limit scale factor. Right now, this can be done through
themes, but a GUI settings may be interesting. If I add such feature,
let's just do it from scratch later.
Current code only guess resolution for a single monitor. Ideally
the widget sizes could be different depending on the window where a
given widget is on. But that's a start.
Allow overriding icon sizes set in themes from the preferences.
This initial commit updates only toolbox icons. More to come.
4 options are available: small, medium, large and huge (the later would
likely be useful for HiDPI screens).
Uses a new widget GimpIconSizeScale.
In order to make a clear separation between the core modules and the
UI modules, move the necessary enums from display-enums.h and
widgets-enums.h to config-enums.h and the files
gimpdisplayoptions.[ch] from the display to the config module. This
removes the config -> display dependency.
This change has three main benefits
* It lets us remove includes of display files from the config module
* We don't have to link gimp-console and test-config with a subset of
object files from the display module
* It is reflected in devel-docs/gimp-module-dependencies.svg that the
application is made up of core modules and UI modules and that no
core module depends on any UI module
Richard McLean