This fixes all our GObject Introspection issues with GimpUnit which was
both an enum and an int-derived type of user-defined units *completing*
the enum values. GIR clearly didn't like this!
Now GimpUnit is a proper class and units are unique objects, allowing to
compare them with an identity test (i.e. `unit == gimp_unit_pixel ()`
tells us if unit is the pixel unit or not), which makes it easy to use,
just like with int, yet adding also methods, making for nicer
introspected API.
As an aside, this also fixes#10738, by having all the built-in units
retrievable even if libgimpbase had not been properly initialized with
gimp_base_init().
I haven't checked in details how GIR works to introspect, but it looks
like it loads the library to inspect and runs functions, hence
triggering some CRITICALS because virtual methods (supposed to be
initialized with gimp_base_init() run by libgimp) are not set. This new
code won't trigger any critical because the vtable method are now not
necessary, at least for all built-in units.
Note that GimpUnit is still in libgimpbase. It could have been moved to
libgimp in order to avoid any virtual method table (since we need to
keep core and libgimp side's units in sync, PDB is required), but too
many libgimpwidgets widgets were already using GimpUnit. And technically
most of GimpUnit logic doesn't require PDB (only the creation/sync
part). This is one of the reasons why user-created GimpUnit list is
handled and stored differently from other types of objects.
Globally this simplifies the code a lot too and we don't need separate
implementations of various utils for core and libgimp, which means less
prone to errors.
There is really nothing specific to the core application, it is quite a
generic widget, so it would be nice for plug-ins to be able to use this
widget.
Add a "Unified interaction" option to the 3D Transform tool, and a
corresponding "unified" property to GimpToolTransform3DGrid. When
active, all three interaction modes of the grid (camera, move, and
rotate) are available simultaneously, regardless of the active
dialog page. In this mode, the inner and outer regions of the item
are used for moving and rotation, respectively, and the vanishing-
point is controlled through through a handle.
Add a new 3D Transform tool, based on GimpToolTransform3DGrid,
added in the previous commit. The tool UI provides a notbook with
three tabs, corresponding to the three GimpToolTransform3DGrid
modes:
Camera - allows setting the primary vanishing point, as well as
the camera's focal length, expressed either directly, or as the
camera's angle of view, relative to the whole image or the
transformed item. By default, the vanishing point is aligned
with the item's center, and the angle of view is fixed relative
to the item; this essentially means that each item is transformed
using a local perspective, independent of its position and size
relative to the image. A global perspective can be achieved by
using a common vanishing point and focal length (or an image-
relative angle of view).
Move - allows moving the item using X, Y, and Z offsets.
Rotate - allows rotating the item using X, Y, and Z Euler angles.
The order of rotation of the different axes can be controlled by
a set of numbered buttons next to the sliders, and the rotation's
pivot can be controlled using a pivot selector.
