PixMap32Bit
PixMap32Bit Determine if PixMap requires 32-bit addr mode to access its pixels
#include <QDOff screen.h> Graphics Devices
PixMapHandle pm ; Pixel map handle returned from a
returns boolean, 0 if 32-bit addressing not required
PixMap32Bit returns TRUE if the specified pixel map requires 32-bit
addressing mode for access to its pixels.