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).
...but they aren't clipped
gimp_display_shell_profile_can_convert_to_u8(): allow the shortcut of
converting directly to 8-bit for display only for GIMP_COMPONENT_TYPE_U8.
This might be an lcms bug, the code can be enabled again for U16 and
U32 if it's indeed an lcms bug and it gets fixed.
but they aren't clipped
Add gimp_display_shell_profile_can_convert_to_u8() which returns
whether the lcms transform can safely write directly into an u8 buffer
without destroying out-of-gammut pixel values, which we assume is the
case for all integer formats. If the function returns FALSE, always
convert via the R'G'B'A float filter_buffer.
Also connect to the image's "precision-changed" signal and update the
profile transform when it's emitted.
- disable auto-adding of the lcms display filter module
- change profile convert dest formats to be always R'G'B'A, a display
profile transform outputs something that can be displayed directly,
so no additional gamma transform must happen when the pixels are
copied to a cairo-ARGB32 buffer
- add a medium forest of if() branches to gimpdisplayshell-filter.c
which cover all combinations of profile and display filter
transforms
- all of this is still very broken when changing an image to linear,
because the configured RGB profile from prefs will do horrible
nonsense (things work fine though with a per-image profile that is
for linear data)
