| 摘要 |
A graphics processor renders pixel data for a first render surface or frame, the pixel data being organized in a plurality of regions. A mapping 16 between each region and a reference to the memory segment of frame buffer is stored. Data representing a second render surface comprises memory segments storing only regions of pixel data of the second render surface determined to be different to corresponding regions of the first or previous render surface, and a mapping comprises references to the memory segments for regions of the first render surface having the same pixel data as respective corresponding regions of the second render surface, and references to the memory segments storing the pixel data for regions of the second render surface having different pixel data than respective corresponding regions of the first render surface. A counter can be maintained for each memory segment to track how many surfaces use pixel data stored therein and a pool of free memory segments can be maintained. |
