Tile-Based Window Compositing for Reduced Power

The patent divides the window buffer into multiple tiles and processes them individually. By comparing each tile with the corresponding region in the frame buffer, the system identifies only the changed tiles that need to be written, rather than writing the entire window buffer. This segmentation enables selective updating of only the necessary portions, reducing memory bandwidth usage and power consumption while maintaining complete and accurate display updates.

The patent extracts and processes window buffer data in discrete tile units rather than as a complete window buffer. By comparing each tile with its corresponding frame buffer region and identifying only the changed tiles, the system extracts and writes only the necessary data portions to the frame buffer. This extraction approach maintains display accuracy by ensuring all changed regions are captured while significantly reducing the quantity of memory bandwidth required.

The patent segments the window compositing process into tile-level operations. Instead of performing blending and compositing on entire windows, the system processes individual tiles independently. This segmentation allows the graphics processor to efficiently handle only the changed tiles, reducing processing overhead and improving productivity while maintaining correct GUI rendering through systematic comparison and selective writing of tile data.