ref: 44cbb293088840d5813a69c6dc850b0444c4e27b
dir: /sys/src/libmemlayer/lsetrefresh.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> #include <memlayer.h> int memlsetrefresh(Memimage *i, Refreshfn fn, void *ptr) { Memlayer *l; l = i->layer; if(l->refreshfn!=nil && fn!=nil){ /* just change functions */ l->refreshfn = fn; l->refreshptr = ptr; return 1; } if(l->refreshfn == nil){ /* is using backup image; just free it */ freememimage(l->save); l->save = nil; l->refreshfn = fn; l->refreshptr = ptr; return 1; } l->save = allocmemimage(i->r, i->chan); if(l->save == nil) return 0; /* easiest way is just to update the entire save area */ l->refreshfn(i, i->r, l->refreshptr); l->refreshfn = nil; l->refreshptr = nil; return 1; }