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- Description
The TDx_DrawSurface::PageLock method will prevent a system memory surface from being paged out while a DMA blit is taking place.
The lock count for the surface will be incremented. Use TDx_DrawSurface::PageUnlock() to decrement the lock count. Once the lock count reaches zero the surface is unlocked and can again be paged out by the operating system.
Only non-primary system memory surfaces can be PageLocked. Calling this method on display memory surfaces will do nothing other than return without error.
PageLock must be held before using DMA support, otherwise the blit will use software emulation.
PageLocking excessive amounts of memory can seriously impede operating system performance.
If the method call fails, the OnError event will be triggered with one of the following values:
DDERR_CANTPAGELOCK
DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS
DDERR_SURFACELOST
- Parameters
- See Also
- Top
TDx_Draw_Library v2.00 Component Reference
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[ TDx_DrawSurface::PageLock() ] [ next: PageUnlock() ] [ prev: Lock() ] public:
virtual bool __fastcall PageLock();
TDX_DRAWSURFACE::PAGELOCK()
[ component method ]
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