Determine the memory requirements for reading an image from the screen
unsigned long PgReadScreenSize( PhRect_t *rect );
This function determines how much memory is required to store an image that would be generated by a corresponding call to PgReadScreen(). This function is useful only if you plan to allocate an image storage buffer yourself.
The PhRect_t structure pointed to by rect specifies the target area (in absolute Photon coordinates).
|You must target this function at a specific card by calling PdSetTargetDevice(). PgReadScreenSize() blocks until the operation is complete.|
The number of bytes required to store the image, including palette data (if applicable), or 0 if an error occurred.