There are no plug-ins which uses GimpRGB for procedure argument, nor is there
any base PDB procedure. We don't pass this type anymore through from/to
core/plug-ins. So let's clean the whole code out as a next step to get rid of
GimpRGB from our codebase!
Allow (script-fu-use-v3) in script, or in SF Console.
Definitive description is in script-fu/docs/using-v3-binding.md
Makes SF interpret v3 of SF dialect.
- marshals single return value from PDB without wrapping in list
- marshals boolean return value from PDB as #t #f instead of integers
- marshals boolean to PDB from #t and #f or TRUE and FALSE
- marshals void return from PDB as () instead of (#t), but that is moot.
The version of SF dialect is distinct from the version of the PDB API.
Dialect v3 is opt-in: the initial dialect of all SF tools remains v2.
Commit also allows #t,#f for defaults of SF-TOGGLE instead of TRUE, FALSE
but that is an independent enhancement (but closely related.)
Affects interpreter state of the current process.
Not an attribute per se of a plugin.
While in this state, a plugin should not call PDB procedures
which are themselves v2 script plugins,
or a few utility scripts in script-fu-util.scm,
but that is rarely needed.
Does not remove symbols TRUE and FALSE from dialect.
A script can also call (script-fu-use-v2) to revert.
That is also discouraged but useful e.g. for testing.
Extract methods related to color into new file.
So method names document what is being done.
So related code is together.
Ditto for resource.
No functional change.
Preparing for changes to reset/default and changes to representation of pixels
in lists of differing lengths rgb vs rgba.
Right now, I just transform any GeglColor return value into a RGB u8 triplet,
because that's also how we were supporting GimpRGB anyway, though it's seriously
limited.
Ideally we'd add some real concept of generic color abstraction in Script-fu
too, which could support any color model, space and precision.
This commit and the ones prior are simple refactoring,
with no intended functional changes.
In anticipation of enhancements 9608 and 8404
which make returned values more scheme like.
Also makes code more readable.
