METHOD AND APPARATUS FOR GENERATING AN OUTPUT SURFACE FROM ONE OR MORE INPUT SURFACES IN DATA PROCESSING SYSTEMS

摘要

In a data processing system, an output surface, such as frame to be displayed, is generated as a plurality of respective regions with each respective region of the output surface being generated from a respective region or regions of one or more input surfaces. When a new version of the output surface is to be generated 80, for each region of the output surface it is determined which region or regions of the input surface or surfaces contribute to the region of the output surface 84 and then checked whether the contributing region or regions of the input surface or surfaces have changed since the previous version of the output surface region was generated 85. If there has been a change in the contributing region or regions of the input surface or surfaces since the previous version of the region in the output surface was generated 86, the region of the output surface is regenerated 87.

主权项

1. A method of generating an output surface from one or more input surfaces in a data processing system, the method comprising:
generating the output surface as a plurality of respective regions that together form the output surface, each respective region of the output surface being generated from a respective region or regions of one or more input surfaces; and when a new version of the output surface is to be generated, for at least one region of the output surface: (i) determining which region or regions of the input surface or surfaces contribute to the region of the output surface; (ii) checking whether the contributing region or regions of the input surface or surfaces have changed since the previous version of the output surface region was generated; and (iii) if there has been a change in the contributing region or regions of the input surface or surfaces since the previous version of the region in the output surface was generated, regenerating the region of the output surface.