Don't use the (wrong) global display color managment switch to
determine whether or not to convert the buffer to the image's
profile. Use the image's "is color managed" switch.
to not return a reference that has to be dropped. Also allow NULL to
be returned if the managed cannot have a profile. If it can have one,
get_color_profile() still always returns a profile (either the
assigned one, or a generated built-in one).
gimp_layer_new_convert_profile(): if there is a profile, always use
lcms to copy between the buffers, to avoid the additional gamma
conversion gegl_buffer_copy/get() would do in some cases. This should
fix copying between linear and gamma images.
In gimplayer-new.c, convert new layers to the image's profile if color
management is not disabled in prefs. This should convert pixels from
whatever source if they have a profile attached. If they don't have a
profile, no conversion is done. I'm not entirely sure if this
automatic conversion is always the right thing to do, please test.
and pass them where we know the buffer could be from another image.
Pass "NULL, 0" if we know it's the same image.
Add gimp_layer_new_convert_profile() which takes the newly created
layer and the ICC data/length; call it from both
gimp_layer_new_from_gegl_buffer() and gimp_layer_new_from_pixbuf().
gimp_layer_new_convert_profile() is empty, this is just
infrastructure.
Michael Natterer