ref: 44cbb293088840d5813a69c6dc850b0444c4e27b
dir: /sys/src/libmemlayer/lhide.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> #include <memlayer.h> /* * Hide puts that portion of screenr now on the screen into the window's save area. * Expose puts that portion of screenr now in the save area onto the screen. * * Hide and Expose both require that the layer structures in the screen * match the geometry they are being asked to update, that is, they update the * save area (hide) or screen (expose) based on what those structures tell them. * This means they must be called at the correct time during window shuffles. */ static void lhideop(Memimage *src, Rectangle screenr, Rectangle clipr, void *etc, int insave) { Rectangle r; Memlayer *l; USED(clipr.min.x); USED(insave); l = etc; if(src != l->save){ /* do nothing if src is already in save area */ r = rectsubpt(screenr, l->delta); memdraw(l->save, r, src, screenr.min, nil, screenr.min, S); } } void memlhide(Memimage *i, Rectangle screenr) { if(i->layer->save == nil) return; if(rectclip(&screenr, i->layer->screen->image->r) == 0) return; _memlayerop(lhideop, i, screenr, screenr, i->layer); } static void lexposeop(Memimage *dst, Rectangle screenr, Rectangle clipr, void *etc, int insave) { Memlayer *l; Rectangle r; USED(clipr.min.x); if(insave) /* if dst is save area, don't bother */ return; l = etc; r = rectsubpt(screenr, l->delta); if(l->save) memdraw(dst, screenr, l->save, r.min, nil, r.min, S); else l->refreshfn(dst, r, l->refreshptr); } void memlexpose(Memimage *i, Rectangle screenr) { if(rectclip(&screenr, i->layer->screen->image->r) == 0) return; _memlayerop(lexposeop, i, screenr, screenr, i->layer); }