What this commit does is keep the same code logic while moving to
GeglColor. Yet it's not **really** space-invaded yet. What we need to do
now:
1. Take into account the image space, and this is what we must navigate
through, in particular for various representations of RGB or HSV.
I.e. that if the active image is in anyRGB, the RGB values shown must
be within anyRGB. Right now, everything is still shown/used as sRGB
(even though it's properly retrieved and transformed to the target
space thanks to GeglColor).
2. Show space info to make things clear and explicit, by adding some
label somewhere.
3. Allow to switch between image and softproof spaces, regarding
out-of-gamut display. I.e. that while RGB/HSV must be shown within
the image space (assuming it's anyRGB), we may want to show
out-of-gamut area (pink areas) within the softproof space. This may
mean adding a checkbox. Or maybe simply taking into account whether
we are in softproof mode or not?
4. We can likely move off gimp_widget_get_color_transform() into using
gimp_widget_get_render_space() for display drawing. We don't need any
soft-proofing or black point compensation for any of these widgets so
pure babl is fine. Indeed we want to show any in-gamut color
correctly (and not transformed according to specific intents or
through soft-proofing). We will take care of the proofing case with
out-of-gamut area showing only.
5. In the various drawing functions, we should move to
CAIRO_FORMAT_RGBA128F. The color selection area might be wide enough
that it makes sense to be more accurate, especially as we are
essentially showing color gradients in 1 or 2 directions in these
various widgets.
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