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# File 'lib/img2zpl/image.rb', line 7
def to_zpl(black_threshold: 0.5, invert: false, compress: true)
bytes_per_row = (width % 8).positive? ? (width / 8) + 1 : (width / 8)
byte_count = bytes_per_row * height
data, line, previous_line, byte = Array.new(4) { +"" }
get_pixels.each do |row|
row.each_with_index do |column, i|
r, g, b = column.map(&:to_i)
b_dot, w_dot = invert ? %w[1 0] : %w[0 1]
byte << (((r + g + b) > (black_threshold * 765)) ? b_dot : w_dot)
if ((i + 1) % 8).zero? || i == (width - 1)
line_str = byte.ljust(8, "0").to_i(2).to_s(16).upcase.rjust(2, "0")
line << line_str
byte = +""
end
end
data << if compress
((line == previous_line) ? ":" : line.gsub(/0+$/, ",").gsub(/F+$/, "!"))
else
line
end
previous_line = line
line = +""
end
_compress(data) if compress
"^GFA,#{byte_count},#{byte_count},#{bytes_per_row},#{data}^FS"
end
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