Previously we were hiding the extrema bin, now we display it "half" on
each side which sort of maps better to the concept of circular spectrum
At the same time we move the zoom spec to {center,span} rather than
{start,stop} since it makes more sense and matches the channel specs
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
These are purely display things that allow to highligh chunks of spectrum
of interest. (like currently selected channel)
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
There is a lot of parameters that have no influence on the internal
computations but solely affect the rendering call. The height / width
are the only two that were supported previously.
This commit re-structures the drawing code and introduces a lot more
of those parameters. Instead of just passing them all as arguments, a
'struct fosphor_render' is introduced to hold them.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
- It's not longer hardcoded / computed in the kernel, but computed
once and read from constant memory
- By default it uses a periodic Hamming window
- But you can load any window as a simple array of float
- Different types of window is deemed out-of-scope here. The default
is provided just for convenience to have something valid.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Although this is not actually used anywhere yet, but will be used in the
drawing routines to draw a proper scale.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
The CL code keeps its own copy since those values are tweaked to be
applied in the kernel. We may also need the callback in the future if
instead of storing them we reconfigure the kernel at that point.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Sylvain Munaut