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local disp_common = require("disp_common")
-- a vlorb consists of six gromlings[A
-- 1 2
-- 4 8
-- 16 Q
-- these are characters 0x80 through 0x9f in the cc charset
-- which is only 2^5 characters though. for the sixth bit you flip the colours
-- of that vlorb.
-- on colour, off colour, gromlings 1 through 6 (bools)
-- returns text colour, bg color, and vlorbchar
local function vlorb(onc,offc, g1,g2,g3,g4,g5,g6)
local textc,bgc = onc,offc
if g6 then textc,bgc=bgc,textc end
local vlorbchar = 0x80
-- ~= on booleans is xor
-- if g6 set then flip all the other bits
if g1 ~= g6 then vlorbchar=vlorbchar+1 end
if g2 ~= g6 then vlorbchar=vlorbchar+2 end
if g3 ~= g6 then vlorbchar=vlorbchar+4 end
if g4 ~= g6 then vlorbchar=vlorbchar+8 end
if g5 ~= g6 then vlorbchar=vlorbchar+16 end
return textc,bgc,string.char(vlorbchar)
end
local function all_palette_distances(R)
local out = {}
for a=0,15 do
local ia=2^a
out[ia] = {}
for b = 0,15 do
local ib=2^b
local ca = {R.getPaletteColor(ia)}
local cb = {R.getPaletteColor(ib)}
local dist = disp_common.color_dist(ca,cb)
out[ia][ib] = dist
end
end
return out
end
local function list_contains(list,val)
for _,v in ipairs(list) do
if v == val then return true end
end
return false
end
-- R, lPx_gromlings, l_pdists -> lCx_gromlings
local function adjust_to_2_colors(R,gromlings,pdists)
-- gromlings goes 1 2 3 4 5 6
-- compress the 6 pixels to just 2 colors
-- return the list of cidxs
local gromling_colors = {}
for i,c in ipairs(gromlings) do
local cx = disp_common.closest_palette_color(R,c)
gromling_colors[i] = cx
end
local all_current_colors = {}
local ncolors = 0
for _,cidx in ipairs(gromling_colors) do
if not all_current_colors[cidx] then ncolors = ncolors + 1 end
all_current_colors[cidx] = true
end
while ncolors > 2 do
-- print("- ncolors is "..ncolors)
-- io.write("all_current_colors: ")
-- for k in pairs(all_current_colors) do io.write(k," ") end
-- io.write("\ngromling_colors: ")
-- for k,v in pairs(gromling_colors) do print(k,v) end
--print()
-- merge closest two colors until there are only 2 distinct ones left
local best_dist = 9999
local best_a = nil
local best_b = nil
for a in pairs(all_current_colors) do
for b in pairs(all_current_colors) do
if a ~= b then
local dist = pdists[a][b]
assert(dist)
if dist < best_dist then
best_dist = dist
best_a = a
best_b = b
end
end
end
end
-- todo: be cleverer when deciding whether to merge a into b, or b into a
-- currently just merge b into a
assert(best_a,"no best_a")
assert(best_b,"no best_b")
assert(best_a ~= best_b,"best a and b are the same")
--print("mergng "..best_b.." into "..best_a)
all_current_colors[best_b] = nil
ncolors=ncolors-1
for gidx,col in ipairs(gromling_colors) do
if col == best_b then gromling_colors[gidx] = best_a end
end
end
--print("-#-- ncolors is "..ncolors)
--io.write("all_current_colors: ")
--for k in pairs(all_current_colors) do io.write(k," ") end
--io.write("\ngromling_colors: ")
--for k,v in pairs(gromling_colors) do print(k,v) end
--print()
return gromling_colors
end
local function gromling_list_to_vlorb(gromling_colors)
-- takes list of cidxs
local ca = nil
local cb = nil
local gs = {}
for i,col in ipairs(gromling_colors) do
if col == ca then
gs[i] = true
elseif col == cb then
gs[i] = false
else
if not ca then
ca = col
gs[i] = true
elseif not cb then
cb = col
gs[i] = false
else
error("third gromling color in vlorb")
end
end
end
return ca,cb or colors.black,table.unpack(gs)
end
-- todo: refactor common stuff into a common file
local function disp(R,img,scrx,scry,w,h,imgx,imgy)
-- w and h are image coords
scrx = scrx or 1
scry = scry or 1
w = w or img.width
h = h or img.width
imgx = imgx or 1
imgy = imgy or 1
disp_common.improve_palette(R,img,w,h,imgx,imgy)
local pdists=all_palette_distances(R)
local sw = math.ceil(w/2)
local sh = math.ceil(h/3)
for soffx=0,sw do
for soffy=0,sh do
local ioffx=soffx*2
local ioffy=soffy*3
R.setCursorPos(scrx+soffx,scry+soffy)
local lPx_gromlings = {}
for goffy=0,2 do
for goffx=0,1 do
local px = img[imgy+ioffy+goffy][imgx+ioffx+goffx] or {0,0,0}
table.insert(lPx_gromlings,px)
end
end
local lCx_gromlings = adjust_to_2_colors(R,lPx_gromlings,pdists)
-- for k,v in ipairs(lCx_gromlings) do print("thethe",k,v) end
local vlorbdf = {gromling_list_to_vlorb(lCx_gromlings)}
-- for k,v in ipairs(vlorbdf) do print("ehteht",k,v) end
local textc,bgc,vlorbchar = vlorb(table.unpack(vlorbdf))
R.setTextColor(textc)
R.setBackgroundColor(bgc)
R.write(vlorbchar)
end
end
end
return {vlorb=vlorb,disp=disp}
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