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--[[ Lua Color functions
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2017 William Wilgus
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
]]
--[[ Exposed Functions
_clr.inc
_clr.set
-- Exposed Constants
IS_COLOR_TARGET
]]
if not rb.lcd_framebuffer then rb.splash(rb.HZ, "No Support!") return nil end
IS_COLOR_TARGET = false
-- Only true when we're on a color target, i.e. when LCD_RGBPACK is available
if rb.lcd_rgbpack ~= _NIL then
IS_COLOR_TARGET = true
end
local _clr = {} do
-- Internal Constants
local _NIL = nil -- _NIL placeholder
local maxstate = (bit.lshift(1, rb.LCD_DEPTH) - 1)
if rb.LCD_DEPTH > 24 then -- no alpha channels
maxstate = (bit.lshift(1, 24) - 1)
end
local function init(v)
return v or 0
end
-- clamps value to >= min and <= max rolls over to opposite
local function clamp_roll(val, min, max)
if min > max then
local swap = min
min, max = max, swap
end
if val < min then
val = max
elseif val > max then
val = min
end
return val
end
-- sets color -- monochrome / greyscale use 'set' -- color targets 'r,b,g'
-- on monochrome/ greyscale targets:
-- '-1' sets the highest 'color' state & 0 is the minimum 'color' state
local function clrset(set, r, g, b)
local color = set or 0
if IS_COLOR_TARGET then
if (r ~= _NIL or g ~= _NIL or b ~= _NIL) then
r, g, b = init(r), init(g), init(b)
color = rb.lcd_rgbpack(r, g, b)
end
end
return clamp_roll(color, 0, maxstate)
end -- clrset
-- de/increments current color by 'inc' -- optionally color targets by 'r,g,b'
local function clrinc(current, inc, r, g, b)
local color = 0
current = current or color
inc = inc or 1
if IS_COLOR_TARGET then
local ru, gu, bu = rb.lcd_rgbunpack(current);
if (r ~= _NIL or g ~= _NIL or b ~= _NIL) then
r, g, b = init(r), init(g), init(b)
ru = ru + r; gu = gu + g; bu = bu + b
color = rb.lcd_rgbpack(ru, gu, bu)
else
ru = ru + inc; gu = gu + inc; bu = bu + inc
color = rb.lcd_rgbpack(ru, gu, bu)
end
else
color = current + inc
end
return clamp_roll(color, 0, maxstate)
end -- clrinc
-- expose functions to the outside through _clr table
_clr.set = clrset
_clr.inc = clrinc
end -- color functions
return _clr
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