WM_CAP_SET_OVERLAY
The
WM_CAP_SET_OVERLAY message enables or disables overlay mode. In overlay mode,
video is displayed using hardware overlay. You can send this message explicitly
or by using the capOverlay
macro.
WM_CAP_SET_OVERLAY
wParam = (WPARAM) (BOOL) (f);
lParam = 0L;
Parameters
f
Overlay flag.
Specify TRUE for this parameter to enable overlay mode or FALSE to disable it.
Return Values
Returns TRUE
if successful or FALSE otherwise.
Remarks
Using an overlay
does not require CPU resources.
The fHasOverlay
member of the CAPDRIVERCAPS
structure indicates whether the device is capable of overlay. The fOverlayWindow
member of the CAPSTATUS
structure indicates whether overlay mode is currently enabled.
Enabling
overlay mode automatically disables preview mode.
See Also