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The existing iterative *_setup() interface only described
settings not found, quietly accepting usable settings already
present in the til_settings_t.
This worked fine for the existing interactive text setup thing,
but it's especially problematic for providing a GUI setup
frontend.
This commit makes it so the *_setup() methods always describe
undescribed settings they recognize, leaving the setup frontend
loop calling into the *_setup() methods to both apply the
description validation if wanted and actually tie the description
to respective setting returned by the _setup() methods as being
related to the returned description.
A new helper called til_settings_get_and_describe_value() has
been introduced primarily for use of module setup methods to
simplify this nonsense, replacing the til_settings_get_value()
calls and surrounding logic, but retaining the til_setting_desc_t
definitions largely verbatim.
This also results in discarding of some ad-hoc
til_setting_desc_check() calls, now that there's a centralized
place where settings become "described" (setup_interactively in
the case of rototiller).
Now a GUI frontend (like glimmer) would just provide its own
setup_interactively() equivalent for constructing its widgets for
a given *_setup() method's chain of returned descs. Whereas in
the past this wasn't really feasible unless there was never going
to be pre-supplied settings.
I suspect the til_setting_desc_check() integration into
setup_interactively() needs more work, but I think this is good
enough for now and I'm out of spare time for the moment.
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Largely mechanical rename of librototiller -> libtil, but
introducing a til_ prefix to all librototiller (now libtil)
functions and types where a rototiller prefix was absent.
This is just a step towards a more libized librototiller, and til
is just a nicer to type/read prefix than rototiller_.
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This is a first approximation of separating the core modules and
threaded rendering from the cli-centric rototiller program and
its sdl+drm video backends.
Unfortunately this seemed to require switching over to libtool
archives (.la) to permit consolidating the per-lib and
per-module .a files into the librototiller.a and linking just
with librototiller.a to depend on the aggregate of
libs+modules+librototiller-glue in a simple fashion.
If an alternative to .la comes up I will switch over to it,
using libtool really slows down the build process.
Those are implementation/build system details though. What's
important in these changes is establishing something resembling a
librototiller API boundary, enabling creating alternative
frontends which vendor this tree as a submodule and link just to
librototiller.{la,a} for all the modules+threaded rendering of
them, while providing their own fb_ops_t for outputting into, and
their own settings applicators for driving the modules setup.
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These modules are meta modules, and the only place this
information is presented currently is in the rtv module captions
overlaying the visual output of unrelated modules.
So it's rather misleading to put the meta module's author and
license on-screen when what's being shown is arguably just a tiny
fraction of the meta module's contribution.
Rather than bother with constructing license and author lists at
runtime from the modules incorporated by these meta modules,
let's instead adopt a policy of meta modules omit any declaration
of license or authorship outside of the source. This is a simple
solution for now, it can be revisited later if necessary.
Changing the .author member of rototiller_module_t to an
.authors() function pointer wouldn't be difficult. But it does
open up something of a can of worms when considering recursive
dependencies and needing to construct unique authors and licenses
lists from things like nested meta modules. Obviously there
can't be infinite recursion as that would manifest in the
rendering path as well, but what I'm more concerned about is
properly handling potentialy quite long lists. It's already
annoying when rtv has to deal with a long settings string, which
I believe currently is just truncated. The same would have to be
done with long authors/licenses I guess.
In any case, I think it's probably fine to just leave authorship
and license ambiguous when a meta module is shown in rtv. It's
certainly preferable to vcaputo@pengaru.com getting credit for
everything shown in the three meta modules currently implemented,
or more specifically, the two shown in rtv; compose and montage.
Note this required making rtv tolerante of NULL .license and
.author rototiller_module_t members.
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Minor cosmetic consistency fixup
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now: "drizzle:stars:spiro:plato"
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In case some code path creates module contexts and renders without
applying settings, it's important to ensure there are defaults.
As-is this would have crashed compose because compose_layers would
have been NULL, and compose_create_context() assumed compose_layers
always contained something useful.
Montage would have been an example of this, though for other reasons
montage has had compose disabled so I don't think anything currently
would have triggered this.
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--module=compose,layers=first:second:third:...
this draws the named modules in the order listed, overdrawing the
output of the previous layers in a cumulative fashion.
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