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# png_to_lua.rb - Convert a PNG image to Lua source
require 'chunky_png'
if ARGV.length < 2
puts "Usage: #{$0} <input.png> <output.lua>"
exit 1
end
input_filename = ARGV[0]
output_filename = ARGV[1]
image = ChunkyPNG::Image.from_file(input_filename)
image_name = File.basename(input_filename, File.extname(input_filename))
File.open(output_filename, 'w') do |f|
f.write("IMAGES = IMAGES or {}\n")
f.write("IMAGES['#{image_name}'] = {\n")
f.write(" width = #{image.width},\n")
f.write(" height = #{image.height},\n")
f.write(" pixels = {\n")
(0...image.height).each do |y|
row = '{'
x = 0
while x < image.width do
length = 1
rgba = ChunkyPNG::Color.to_truecolor_alpha_bytes(image[x, y])
while x + length < image.width do
if rgba == ChunkyPNG::Color.to_truecolor_alpha_bytes(image[x + length, y]) then
length += 1
else
break
end
end
row << "#{length},#{rgba[0]},#{rgba[1]},#{rgba[2]},#{rgba[3]},"
x += length
end
row << '}'
f.write(" #{row},\n")
end
f.write(" },\n")
f.write(" bytes = table.concat({\n")
image.to_blob.bytes.each_slice(100) do |slice|
f.write("string.char(#{slice.join(",")}),\n")
end
f.write(" })\n")
f.write("}\n")
end
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