Our Preferences exposes a concept of "Preferred color profile" (for RGB,
grayscale and CMYK), which is used in some places to be proposed as
default alternative to built-in profiles. But it was not used in the
import color profile dialog (only 2 choices were: keep the image profile
or convert to built-in RGB).
This commit now adds this third choice, which is even made default when
hitting the "Convert" button directly, without tweaking with the dialog.
Because we can assume that if someone made the explicit choice to label
such a profile as "Preferred", this is more likely the one to convert to
(if one even wants to convert from an embedded profile anyway).
As for the `Preferences > Image Import & Export > Color profile policy`,
they now propose 4 choices: Ask, Keep embedded profile, Convert to
built-in or preferred profiles.
These actions raise a GimpViewableDialog. For this to work, I made this
widget work with a list of GimpViewable, not a single viewable anymore
(so maybe the widget class name should change?).
When this list contains only a single GimpViewable, it will display
exactly like before, with a viewable preview. With several viewables,
the preview won't show.
This allows to add masks to all selected layers at once, with the same
basic options for all masks, as set in the dialog.
...doesn't work
Rename the labels to "built-in sRGB color profile" and "built-in
grayscale color profile" because that's what the option does, it never
converted to the preferred profiles from preferences.
Allow to set profiles on grayscale images. Change profile validation
to check for image type and profile type. Actually the patch simply
makes some pieces of code less restrictive. Change user-visible
strings in the profile dialogs accordingly. Change PDB docs
accordingly.
Add gimp_image_import_color_profile(), a GUI vtable entry
query_profile_policy() and a new dialog which returns the profile
policy and the profile to convert to. Get rid of the wrapper that
calls the lcms plug-in for that dialog, the plug-in is now completely
unused.
This commit doesn't add any new features, it's just the former lcms
plug-in dialog implemented in app/ (except the little fix that it is
now aware of linear vs. gamma images).
Jehan