temperatures: display over temperature notifications

[hnez]

Add warning on the LCD …

… and web interface if the LXA TAC is running hot.

[KarlK90]

Are these infallible calls? Otherwise an error here would bring down tacd?

[hnez]

The embedded_graphics crate propagates the Result returned by the draw_iter() method of a DrawTarget trait implementation.

In our implementation this method call is in fact infallible:

tacd/src/ui/display.rs

Lines 143 to 172 in 24bd697

	fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
	where
	I: IntoIterator<Item = Pixel<Self::Color>>,
	{
	let bpp = self.0.var_screen_info.bits_per_pixel / 8;
	let xres = self.0.var_screen_info.xres;
	let yres = self.0.var_screen_info.yres;
	let line_length = self.0.fix_screen_info.line_length;
	for Pixel(coord, color) in pixels {
	let x = coord.x as u32;
	let y = coord.y as u32;
	if x >= xres || y >= yres {
	continue;
	}
	let offset = line_length * y + bpp * x;
	for b in 0..bpp {
	self.0.frame[(offset + b) as usize] = match color {
	BinaryColor::Off => 0x00,
	BinaryColor::On => 0xff,
	}
	}
	}
	Ok(())
	}
	}

[KarlK90]

Thanks for the explanation, in the future I would like to get rid of all these unwrap() calls but as discussed this is fine for now.

[hnez]

I had to do a manual rebase due to a merge conflict in web/src/TacComponents.tsx, invalidating the previous approvals.
Can I get a new approval? Also feel free to click merge.

[KarlK90]

LGTM now.