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device/kobo/sysfs_light: Explicitly handle warmth/brightness = 0

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For warmth and/or brightness = 0, we need to make sure that the
red/green/white LEDs are actually turned off, regardless of the values
for gain/offset.
This commit is contained in:
David Engster 2018-03-09 23:11:23 +01:00 committed by Frans de Jonge
parent 201370a220
commit effc7135a1
1 changed files with 15 additions and 8 deletions
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23
frontend/device/kobo/sysfs_light.lua
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@ -55,14 +55,21 @@ function KoboSysfsLight:setNaturalBrightness(brightness, warmth)
warmth = self.current_warmth
end
-- On Nickel, the values for white/red/green are roughly linearly dependent
-- on the 4th root of brightness and warmth.
local white = math.min(self.white_gain * math.pow(brightness, 0.25) *
math.pow(100 - warmth, 0.25) + self.white_offset, 255)
local red = math.min(self.red_gain * math.pow(brightness, 0.25) *
math.pow(warmth, 0.25) + self.red_offset, 255)
local green = math.min(self.green_gain * math.pow(brightness, 0.25) *
math.pow(warmth, 0.25) + self.green_offset, 255)
local red = 0
local green = 0
local white = 0
if brightness > 0 then
-- On Nickel, the values for white/red/green are roughly linearly dependent
-- on the 4th root of brightness and warmth.
white = math.min(self.white_gain * math.pow(brightness, 0.25) *
math.pow(100 - warmth, 0.25) + self.white_offset, 255)
end
if warmth > 0 then
red = math.min(self.red_gain * math.pow(brightness, 0.25) *
math.pow(warmth, 0.25) + self.red_offset, 255)
green = math.min(self.green_gain * math.pow(brightness, 0.25) *
math.pow(warmth, 0.25) + self.green_offset, 255)
end
white = math.max(white, 0)
red = math.max(red, 0)