42 lines
1021 B
Elixir
42 lines
1021 B
Elixir
defmodule PaintByNumber do
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def palette_bit_size(color_count, pow \\ 1) do
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if color_count <= 2 ** pow do
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pow
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else
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palette_bit_size(color_count, pow + 1)
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end
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end
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def empty_picture() do
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<<>>
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end
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def test_picture() do
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<<0::2, 1::2, 2::2, 3::2>>
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end
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def prepend_pixel(picture, color_count, pixel_color_index) do
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size = palette_bit_size(color_count)
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pixel = <<pixel_color_index::size(size)>>
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<<pixel::bitstring, picture::bitstring>>
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end
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def get_first_pixel(<<>>, _color_count), do: nil
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def get_first_pixel(picture, color_count) do
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size = palette_bit_size(color_count)
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<<value::size(size), _rest::bitstring>> = picture
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value
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end
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def drop_first_pixel(<<>>, _color_count), do: <<>>
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def drop_first_pixel(picture, color_count) do
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size = palette_bit_size(color_count)
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<<_value::size(size), rest::bitstring>> = picture
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rest
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end
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def concat_pictures(picture1, picture2) do
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<<picture1::bitstring, picture2::bitstring>>
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end
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end
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