title: General algorithm for rastering vector image
body: <p>What is the general algorithm of rasterizing vector image? I've found a lot of algorithms of rasterizing primitives such as lines, circles, Bezier curves etc. But for general, what should I do? Simply, go foreach vector figure in vector picture, get its pixels and put them into raster image? Or something else?</p>
  
  <p>And another question, how can I improve the time of processing using concurrency? I can, for example, separate vector figures and concurrently get their pixels. But maybe there are other methods to do this?</p>