get("#388") -- rect functions
get("#428") -- findContents
get("#430") -- makeIcon
get("#433") -- iconDiff

-- fw/fh: 8/17

cursor_unfocused = [[
RRRRRRRRRR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RAAAAAAAAR
RRRRRRRRRR]]

cursor_focused = "AAAAAAAAAA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.IRRRRRRRRA.ERRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.ARRRRRRRRA.AAAAAAAAAA"

cursor_unfocused = cursor_unfocused:gsub("\n", ".")

problem = findContents()
if problem then return problem end

fw, fh = 8, 17 -- font width/height
tw = math.floor((contents_x2-contents_x1)/fw+0.5)
th = math.floor((contents_y2-contents_y1)/fh+0.5)

tolerance = 0.05

for y = 0, th-1 do
  for x = 0, tw-1 do
    xx, yy = contents_x1+x*fw, contents_y1+y*fh-1
    cropped = {width=fw+2, height=fh+2,
      getInt = function(x, y) return img.getInt(xx+x, yy+y) end}
  
    icon = makeIcon(cropped)
    diff = iconDiffWithLimit(icon, cursor_unfocused, tolerance, fw+2, fh+2)
    if diff ~= nil and diff <= tolerance then
      return "Cursor: "..xx..", "..yy..", "..
        xx+cropped.width..", "..yy+cropped.height..
        ". Cursor position: "..(x+1).."/"..(y+1)..
        ". Window not focused."
    end
    diff2 = iconDiffWithLimit(icon, cursor_focused, tolerance, fw+2, fh+2)
    --[[if y == 23 then
      print(x, y, diff, diff2)
      if x == 37 or x == 38 then
        print(icon)
      end
    end]]
    if diff2 ~= nil and diff2 <= tolerance then
      return "Cursor: "..xx..", "..yy..", "..xx+cropped.width..", "..yy+cropped.height..". Cursor position: "..(x+1).."/"..(y+1)..". Window focused."
    end
  end
end

return "Cursor not found"

Began life as a copy of #412