ref: c6d4cd09a395a24ee993c1edf1031e5b01adddde
dir: /sys/src/libmemlayer/ltorear.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> #include <memlayer.h> void _memltorear(Memimage *i, Memimage *rear) { Memlayer *l; Memscreen *s; Memimage *f, *r, *rr; Rectangle x; int overlap; l = i->layer; s = l->screen; while(l->rear != rear){ r = l->rear; x = l->screenr; overlap = rectclip(&x, r->layer->screenr); if(overlap){ memlhide(i, x); l->clear = 0; } /* swap l and r in screen's list */ rr = r->layer->rear; f = l->front; if(rr == nil) s->rearmost = i; else rr->layer->front = i; if(f == nil) s->frontmost = r; else f->layer->rear = r; l->rear = rr; l->front = r; r->layer->rear = i; r->layer->front = f; if(overlap) memlexpose(r, x); } } void memltorear(Memimage *i) { _memltorear(i, nil); _memlsetclear(i->layer->screen); } void memltorearn(Memimage **ip, int n) { Memimage *i, *rear; Memscreen *s; if(n == 0) return; rear = nil; while(--n >= 0){ i = *ip++; _memltorear(i, rear); rear = i; } s = rear->layer->screen; _memlsetclear(s); }