srcRect
OpenCPicParams structure
#include <Quickdraw.h>
typedef struct OpenCPicParams {Size Offset Description
Rect srcRect; 8 0 source rectangle for best display at
hRes, vRes resolution
Fixed hRes; 4 8 best horizontal resolution
Fixed vRes; 4 12 best vertical resolution
short version; 2 16 set to -2
short reserved1; 2 18 reserved for future use
long reserved2; 2 20 reserved for future use

Notes: Note that in the header to a version 2 picture the information is re ordered,
and appears in the format described by the PictureHeader structure.