An image is stored as data representing the values of non-transparent pixels, and stored instructions corresponding to some pixels, resulting in a data structure. The image may be displayed by executing two types of instructions. A first type of instruction includes a command to skip pixels in a destination...http://www.google.ca/patents/US6262746?utm_source=gb-gplus-sharePatent US6262746 - Displaying and storing an image having transparent and non-transparent pixels
