91 lines
1.7 KiB
Ruby
Executable File
91 lines
1.7 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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require 'rmagick'
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# [ ] load the image
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# [ ] map each pixel to a 12 bit color, with pixels less than 25% transparent as mask
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# [ ] sort the color counts
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# [ ] transparent pixels become the mask
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# [ ] turn the big color counts into three bitplames worth of data
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# [ ] turn the little color counts into up to 8 sprites worth of data strips & color changes
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image = Magick::Image.read('topaz.png').first
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rows = []
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class MaskPixel
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def initialize; end
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def color? = false
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end
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class Color
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attr_reader :red, :green, :blue
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def initialize(red:, green:, blue:)
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@red = red
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@green = green
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@blue = blue
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end
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def ==(other)
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red == other.red && green == other.green && blue == other.blue
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end
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alias eql? ==
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def hash
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red * 256 + green * 16 + blue
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end
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end
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class BitplanePixel
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attr_reader :color
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def initialize(color:)
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@color = color
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end
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def color? = true
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end
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MAX_ALPHA = Magick::QuantumRange * 0.25
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BIT_SHIFT = Math.log2(Magick::QuantumRange + 1) - 4
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class PixelRow
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def initialize
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@row = []
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end
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def add(pixel:, x:)
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@row[x] = pixel
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end
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def colors_with_usage
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@row.find_all(&:color?).each_with_object({}) do |pixel, obj|
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obj[pixel.color] ||= 0
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obj[pixel.color] += 1
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end
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end
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end
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image.each_pixel do |px, x, y|
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rows[y] ||= PixelRow.new
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pixel = if px.alpha < MAX_ALPHA
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MaskPixel.new
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else
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BitplanePixel.new(
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color: Color.new(
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red: px.red >> BIT_SHIFT,
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green: px.green >> BIT_SHIFT,
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blue: px.blue >> BIT_SHIFT
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)
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)
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end
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rows[y].add(pixel:, x:)
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end
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pp rows[50].colors_with_usage
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