get("#348") -- rgb and bright

get("#137") -- split

get("#390") -- msinsert

y, w, h = img.height-19, 20, 17

x = img.width-w

if y < 0 or y+h > img.height then return "No Battery Symbol" end

icon = [[

YYYYYYYYYYYYYYYYYYYY

YYYYYYYYYYYYYYYYYYYY

YLCCCCCCCCCCCCCCLYXX

YEEEEEEEEEEEEEEEEYXX

XFFS???????????FFXXX

XGGU???????????GGXXX

XGGT???????????GGDHX

XHHT???????????HHHGX

XIIT???????????IIIIX

WIIT???????????IIINW

WJJT???????????JJXXW

WKKO??????????OKKWWW

WLKHFFFFFFFFFFHKLWVV

VSMLLLLLLLLLLLLMSVVV

VWXXXXXXXXXXXXXXWVVV

VVVVVVVVVVVVVVVVVVVV

VVVVVVVVVVVVVVVVVVVV

]]

icon = split(icon, "\n")

-- count non-question marks

count = 0

for yy=1, h do

  line = icon[yy]

  for xx=1, w do

    c = line:sub(xx, xx)

    if c ~= '?' then

      count=count+1

    end

  end

end

limit = count*25/100

while x >= 0 do

  total, innerPixels = 0, {}

  for yy=y, y+h-1 do

    line = icon[yy-y+1]

    for xx=x, x+w-1 do

      pix = img.getInt(xx, yy)

      c = line:sub(xx-x+1, xx-x+1)

      if c == '?' then

        msinsert(innerPixels, pix)

      else

        b = math.floor(bright(rgb(pix))*25+0.5)

        lb = string.byte(c)-string.byte("A")

        diff = math.abs(b-lb)

        total = total+diff

        if total> limit then goto out end

      end

    end

  end

  sim = math.floor(100*(1-total/(count*25))+0.5)

  print("Similarity at x="..x..": "..sim.."%")

  if sim >= 99 then

    return "Battery Symbol: "..x..", "..y..", "..x+w..", "..y+h

  end

  ::out::

  x = x-1

end

x = nil

return "No Battery Symbol"

-- innerPixels and x, y, w, h are returned for including snippets