convert_artwork.rb

DENSITIES= {
  '-mdpi' => 1.0,
  '-ldpi' => 0.75,
  '-hdpi' => 1.5,
  '-xhdpi' => 2.0,
}

def run_cmd(cmd)
  puts cmd
  system cmd
  raise unless $?.success?
end

# Inc/Dec buttons
if ARGV.include?('incdec')
  DENSITIES.each {|dname, dfactor|
    density= 38*dfactor
    %w[inc dec].each {|name|
      %w[default pressed].each{|state|
        svg= "btn_#{name}_#{state}.svg"
        out= "res/drawable#{dname}/btn_#{name}_#{state}.png"
        run_cmd "convert -background none -density #{density} #{svg} PNG32:#{out}"
      }
    }
  }
end