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function tablelength(T)
local count = 0
for _ in pairs(T) do count = count + 1 end
return count
end
w, h, g = img.width, img.height, img.getInt
x1, y1, x2, y2 = 0, 0, w, h
-- left side
colors = {}
while x1 < x2 do
for y=y1, y2-1 do
colors[g(x1, y)] = 1
end
if tablelength(colors) > 1 then break end
x1=x1+1
end
-- top side
colors = {}
while y1 < y2 do
for x=x1, x2-1 do
colors[g(x, y1)] = 1
end
if tablelength(colors) > 1 then break end
y1=y1+1
end
-- right side
colors = {}
while x2 > x1 do
for y=y1, y2-1 do
colors[g(x2-1, y)] = 1
end
if tablelength(colors) > 1 then break end
x2=x2-1
end
-- bottom side
colors = {}
while y2 > y1 do
for x=x1, x2-1 do
colors[g(x, y2-1)] = 1
end
if tablelength(colors) > 1 then break end
y2=y2-1
end
if x2 <= x1 or y2 <= y1 then -- weird result? return full image
x1, y1, x2, y2 = 0, 0, w, h
end
return "Crop: "..x1..", "..y1..", "..x2..", "..y2