108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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#include <memlayer.h>
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/*
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* Place i so i->r.min = log, i->layer->screenr.min == scr.
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*/
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int
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memlorigin(Memimage *i, Point log, Point scr)
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{
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Memlayer *l;
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Memscreen *s;
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Memimage *t, *shad, *nsave;
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Rectangle x, newr, oldr;
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Point delta;
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int overlap, eqlog, eqscr, wasclear;
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l = i->layer;
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s = l->screen;
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oldr = l->screenr;
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newr = Rect(scr.x, scr.y, scr.x+Dx(oldr), scr.y+Dy(oldr));
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eqscr = eqpt(scr, oldr.min);
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eqlog = eqpt(log, i->r.min);
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if(eqscr && eqlog)
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return 0;
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nsave = nil;
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if(eqlog==0 && l->save!=nil){
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nsave = allocmemimage(Rect(log.x, log.y, log.x+Dx(oldr), log.y+Dy(oldr)), i->chan);
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if(nsave == nil)
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return -1;
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}
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/*
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* Bring it to front and move logical coordinate system.
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*/
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memltofront(i);
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wasclear = l->clear;
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if(nsave){
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if(!wasclear)
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memimagedraw(nsave, nsave->r, l->save, l->save->r.min, nil, Pt(0,0), S);
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freememimage(l->save);
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l->save = nsave;
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}
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delta = subpt(log, i->r.min);
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i->r = rectaddpt(i->r, delta);
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i->clipr = rectaddpt(i->clipr, delta);
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l->delta = subpt(l->screenr.min, i->r.min);
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if(eqscr)
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return 0;
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/*
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* To clean up old position, make a shadow window there, don't paint it,
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* push it behind this one, and (later) delete it. Because the refresh function
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* for this fake window is a no-op, this will cause no graphics action except
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* to restore the background and expose the windows previously hidden.
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*/
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shad = memlalloc(s, oldr, memlnorefresh, nil, DNofill);
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if(shad == nil)
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return -1;
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s->frontmost = i;
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if(s->rearmost == i)
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s->rearmost = shad;
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else
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l->rear->layer->front = shad;
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shad->layer->front = i;
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shad->layer->rear = l->rear;
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l->rear = shad;
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l->front = nil;
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shad->layer->clear = 0;
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/*
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* Shadow is now holding down the fort at the old position.
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* Move the window and hide things obscured by new position.
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*/
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for(t=l->rear->layer->rear; t!=nil; t=t->layer->rear){
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x = newr;
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overlap = rectclip(&x, t->layer->screenr);
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if(overlap){
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memlhide(t, x);
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t->layer->clear = 0;
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}
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}
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l->screenr = newr;
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l->delta = subpt(scr, i->r.min);
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l->clear = rectinrect(newr, l->screen->image->clipr);
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/*
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* Everything's covered. Copy to new position and delete shadow window.
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*/
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if(wasclear)
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memdraw(s->image, newr, s->image, oldr.min, nil, Pt(0,0), S);
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else
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memlexpose(i, newr);
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memldelete(shad);
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return 1;
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}
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void
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memlnorefresh(Memimage *l, Rectangle r, void *v)
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{
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USED(l);
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USED(r.min.x);
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USED(v);
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}
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