NewScreenBuffer

Allocate an offscreen PixMap and an offscreen buffer

#include <QDOff screen.h> Graphics Devices

QDErr NewScreenBuffer( globalRect, purgeable, gdh, off screenPixMap);

Rect * globalRect ; intersection rectangle

Boolean purgeable ; make offscreen buffer purgeable?

GDHandle *gdh ; receives handle to deepest GDevice

PixMapHandle *off screenPixMap ; receives new offscreen PixMap

NewScreenBuffer allocates an offscreen PixMap and an offscreen buffer,

using the depth and color table of the deepest device intersecting with the global

rectangle in screen space. A handle to that device is returned in gdh, and a

handle to the offscreen pixel map is returned in off screenPixMap. If purgeable

is TRUE, the offscreen buffer is made purgeable.

Returns: an Error Code. It is one of:

noErr (0) No error

paramErr (-50) Illegal parameter

cNoMemErr (-152) Failed to allocate memory for structures

Referenced by (3):