require "../src/stumpy_png"
include StumpyPNG

canvas = Canvas.new(256, 256)

(0..255).each do |x|
  (0..255).each do |y|
    # RGBA.from_rgb_n(values, bit_depth) is an internal helper method
    # that creates an RGBA object from a rgb triplet with a given bit depth
    color = RGBA.from_rgb_n(x, y, 255, 8)
    canvas[x, y] = color
  end
end

StumpyPNG.write(canvas, "rainbow.png")

require "../src/stumpy_png"
include StumpyPNG

canvas = Canvas.new(256 * 2, 256 * 2)

(1..2).each do |i|
  puts i
  (0..(255 * i)).each do |x|
    (0..(255 * i)).each do |y|
      puts "X: #{x}, Y: #{y}"
      color = RGBA.from_rgb_n(x | 3, y & 0b10010010, 255, 8)
      canvas[x, y] = color
    end
  end
end

1000.times do
  canvas[rand(512).to_i, rand(512).to_i] = RGBA.from_rgb_n(rand, rand, 255, 8)
end

StumpyPNG.write(canvas, "rainbow.png")

start = start || list.firstIndex
end = end || list.lastIndex

# 减去循环次数是跳过最后一项，最后一项之前对比过，已经是最小的了
for i = start to end
  for j = start to end - iteration
    if isBiggerThan(list[j + 1], list[j])
      swapWithNext(list, j)