Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Last revisionBoth sides next revision | ||
| en:docs:os2:api:vio [2021/09/14 09:45] – prokushev | en:docs:os2:api:vio [2021/09/14 09:47] – prokushev | ||
|---|---|---|---|
| Line 28: | Line 28: | ||
| Application calls VioGetAnsi in VIOCALLS | Application calls VioGetAnsi in VIOCALLS | ||
| VioGetAnsi calls VioRoute | VioGetAnsi calls VioRoute | ||
| - | if AVS registered then VioRoute calls AVS VioGetAnsi | + | if AVS registered then |
| - | if AVS VioGetAnsi requires to call BVS then VioRouter сalls BVS VioGetAnsi | + | |
| - | else VioRouter calls BVS VioGetAnsi | + | if AVS VioGetAnsi requires to call BVS then |
| + | | ||
| + | else | ||
| + | | ||
| Return to application | Return to application | ||
| </ | </ | ||
| Line 60: | Line 63: | ||
| </ | </ | ||
| + | In pseudo code it looks like this | ||
| + | |||
| + | < | ||
| + | Application calls VioGetAnsi in VIOCALLS | ||
| + | VioGetAnsi calls VioRoute | ||
| + | if AVS registered then | ||
| + | VioRoute calls AVS VioGetAnsi | ||
| + | if AVS VioGetAnsi requires to call BVS then | ||
| + | VioRouter сalls BVS VioGetAnsi | ||
| + | else | ||
| + | VioRouter calls BVS VioGetAnsi | ||
| + | If GVS registered then | ||
| + | VioRouter calls GVS VioGetAnsi | ||
| + | Return to application | ||
| + | </ | ||
| In OS/2 2.0 and later VIO still 16-bit. In late OS/2 versions (3.x?) actual code of Video subsystem and Base Video Subsysten was moved to DOSCALLS.DLL (see Fig). VIOCALLS and BVSCALLS is a forwarders to DOSCALLS. | In OS/2 2.0 and later VIO still 16-bit. In late OS/2 versions (3.x?) actual code of Video subsystem and Base Video Subsysten was moved to DOSCALLS.DLL (see Fig). VIOCALLS and BVSCALLS is a forwarders to DOSCALLS. | ||