Syntax
INT is_LockDDOverlayMem(HIDS hf, void** ppMem, INT* pPitch)
Description
In DirectDraw mode is_LockDDOverlayMem() gives access to the image memory and returns the address pointer to the beginning of the image memory. And thus the overlay buffer can be directly written to, without having to use the Windows GDI functions. pPitch returns the line offset in bytes from the beginning of one line to the beginning of the following line. Access must be disabled as soon as possible with the is_UnlockDDOverlayMem() function. Within a LockDDMem – UnlockDDMem block there are no updates of the back buffer on the display.
Parameters
hf |
Frame grabber handle |
ppMem |
Pointer to variable, which will contain address pointer |
pPitch |
Pointer to variable, which will contain the pitch value |
Return value
IS_SUCCESS, IS_NO_SUCCESS
