Abstract: Systems and methods for mapping, decompressing, and compositing graphical image in preparation for displaying an image on a display screen. Graphical image data is received by a graphics engine, which maps portions of the data to pixel positions on the display screen. If the data is compressed, it is decompressed after being mapped to pixel locations. The data is then composited in a scanline buffer, which stored display parameters that specify the colors and other properties of pixel in a single scanline on the display screen. Mapping the data prior to decompression reduces the random access memory resources otherwise required. In particular, the entire volume of compressed graphical image data received by the graphics engine does not need to be decompressed and stored in a random access memory device before being mapped to pixels on the display screen.