GetPixBaseAddr

GetPixBaseAddr Get a pointer to the beginning of the pixel map's pixels

#include <QDOff screen.h> Graphics Devices

PixMapHandle pm ; Pixel map handle returned from a

returns 32-bit pointer to offscreen pixel map pixels

GetPixBaseAddr returns a 32-bit pointer to the beginning of the pixel

map's pixels. Your application should always call GetPixBaseAddr before

accessing the pixels of an offscreen pixel map directly. Then your application

should switch to 32-bit mode, access the pixels, and switch back to 24-bit

mode (if that's the mode you were in). Your application should never access the

baseAddr field of the pixel map directly.

If the offscreen buffer has been purged, GetPixBaseAddr returns NULL.

If QuickDraw is called after GetPixBaseAddr, the contents of the off screen

buffer are not guaranteed to be accurate.

Referenced by (7):