Microsoft Windows CE 3.0  

Typical Scenarios for DMA

This is retired content. This content is outdated and is no longer being maintained. It is provided as a courtesy for individuals who are still using these technologies. This content may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.

System memory to video memory transfers that use the SRCCOPY raster operation are the most common type of hardware-supported blit operation. (The SRCCOPY raster operation, which is documented in the Platform SDK, causes the data within the source rectangle to be copied directly to the destination rectangle.) The most typical use for such an operation is to move textures from a large collection of system memory surfaces to a surface in video memory in preparation for subsequent operations. System-to-video DMA transfers are about as fast as processor-controlled transfers (for example, HEL blits), but are of great utility since they can operate in parallel with the host processor.

 Last updated on Tuesday, May 18, 2004

© 2004 Microsoft Corporation. All rights reserved.