ref: 8ecb188c11f19d97aaac2a731b8b7039f703a468
dir: /sys/src/cmd/image/fns.h/
void initworkrects(Rectangle*, int, Rectangle*); void *emalloc(ulong); void *erealloc(void*, ulong); Memimage *eallocmemimage(Rectangle, ulong); Memimage *ereadmemimage(int); int ewritememimage(int, Memimage*);