The zoom focus discussion on IRC suggests that everybody is annoyed
about centering behavior (or lack thereof), so here is a way to
explicitly center the image witout zooming.
... _even at low zoom levels_
Pass GIMP_ZOOM_FOCUS_POINTER to gimp_display_shell_scale() when
wheel-scrolling, and change the scaling code to really honor
GIMP_ZOOM_FOCUS_POINTER and not apply magic image centering.
This keep the same point centered under the mouse for wheel-scrolling
and the zoom tool (== when the zooming is really triggered at a
certain mouse position).
Explaining in the intro that the reference is the code, and where to
find it.
Rather than writing uint32/64 for every offset, use "pointer" as a
proper and well defined basic data type, whose detailed description is
in the "BASIC CONCEPTS" section at the start of the file.
Implement GimpPickable::get_pixel_average(), added in the previous
commit, in GimpDrawable, GimpImage, and GimpProjection, using
gimp_gegl_average_color(), added in the commit before last. This
is significantly faster than the default implementation.
... which calculates the average color of the pickable over a given
area. Use this function in gimp_pickable_pick_color() when
sample_average is TRUE, and provide a default implementation which
calculates the average color using GimpPickable::get_pixel_at(), as
gimp_pickable_pick_color() did before.
The default implementation is rather slow; classes that implement
the GimpPickable interface can provide a faster specialized version
(see the next commit).
... for layer modes.
KDE developers asked me where the code was so that they could reproduce
actual algorithms in their XCF reader. This is obviously interesting
information to have around in our docs.
We have this problem with flatpak that the common directory
("/usr/share/color/icc") is not visible from inside the sandbox. With
proper permissions, it is actually accessible, yet the host's /usr is
mounted at /run/host/usr/.
Since sandbox systems are getting more common, we need to make this path
customizable. I am therefore adding a --with-icc-directory configure
option to change the default color profile folder at build time.
See: https://github.com/flathub/org.gimp.GIMP/issues/15