ref: efc7a9a729b075aab06bc24ae778304ad98c3ab6
dir: /sys/src/libmemlayer/ltofront.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> #include <memlayer.h> /* * Pull i towards top of screen, just behind front */ static void _memltofront(Memimage *i, Memimage *front, int fill) { Memlayer *l; Memscreen *s; Memimage *f, *ff, *rr; Rectangle x; int overlap; l = i->layer; s = l->screen; while(l->front != front){ f = l->front; x = l->screenr; overlap = rectclip(&x, f->layer->screenr); if(overlap){ memlhide(f, x); f->layer->clear = 0; } /* swap l and f in screen's list */ ff = f->layer->front; rr = l->rear; if(ff == nil) s->frontmost = i; else ff->layer->rear = i; if(rr == nil) s->rearmost = f; else rr->layer->front = f; l->front = ff; l->rear = f; f->layer->front = i; f->layer->rear = rr; if(overlap && fill) memlexpose(i, x); } } void _memltofrontfill(Memimage *i, int fill) { _memltofront(i, nil, fill); _memlsetclear(i->layer->screen); } void memltofront(Memimage *i) { _memltofront(i, nil, 1); _memlsetclear(i->layer->screen); } void memltofrontn(Memimage **ip, int n) { Memimage *i, *front; Memscreen *s; if(n == 0) return; front = nil; while(--n >= 0){ i = *ip++; _memltofront(i, front, 1); front = i; } s = front->layer->screen; _memlsetclear(s); }