mothra: delayed screen updates to reduce flicker

sys/src/cmd/mothra/getpix.c

@@ -36,16 +36,16 @@ void getimage(Rtext *t, Www *w){
 	for(p=w->pix;p!=nil; p=p->next)
 		if(strcmp(ap->image, p->name)==0 && ap->width==p->width && ap->height==p->height){
 			t->b = p->b;
-			update(w);
+			w->changed=1;
 			return;
 		}
 	fd=urlget(&url, -1);
 	if(fd==-1){
 	Err:
-		snprint(err, sizeof(err), "[%s: %r]", url.fullname);
+		snprint(err, sizeof(err), "[img: %s: %r]", url.reltext);
 		free(t->text);
 		t->text=strdup(err);
-		update(w);
+		w->changed=1;
 		close(fd);
 		return;
 	}
@@ -83,7 +83,7 @@ void getimage(Rtext *t, Www *w){
 	p->next=w->pix;
 	w->pix=p;
 	t->b=b;
-	update(w);
+	w->changed=1;
 }
 
 void getpix(Rtext *t, Www *w){

sys/src/cmd/mothra/mothra.c

@@ -241,7 +241,7 @@ extern char *mtpt; /* url */
 
 void main(int argc, char *argv[]){
 	Event e;
-	enum { Eplumb = 128 };
+	enum { Eplumb = 128, Ekick = 256 };
 	Plumbmsg *pm;
 	Www *new;
 	Action *a;
@@ -298,7 +298,7 @@ void main(int argc, char *argv[]){
 	eplumb(Eplumb, "web");
 	if(pipe(kickpipe) < 0)
 		sysfatal("pipe: %r");
-	estart(0, kickpipe[0], 256);
+	estart(Ekick, kickpipe[0], 256);
 	plinit(screen->depth);
 	if(debug) notify(dienow);
 	getfonts();
@@ -333,10 +333,6 @@ void main(int argc, char *argv[]){
 				message(mothra);
 				donecurs();
 			}
-			else if(current->changed){
-				updtext(current);
-				current->changed=0;
-			}
 		}
 
 		flushimage(display, 1);
@@ -345,6 +341,13 @@ void main(int argc, char *argv[]){
 		lockdisplay(display);
 
 		switch(i){
+		case Ekick:
+			if(mouse.buttons==0 && current && current->changed){
+				if(!current->finished)
+					updtext(current);
+				current->changed=0;
+			}
+			break;
 		case Ekeyboard:
 			switch(e.kbdc){
 			default:
@@ -906,6 +909,16 @@ void geturl(char *urlname, int post, int plumb, int map){
 			w->finished = 0;
 			w->alldone = 0;
 			gettext(w, fd, typ);
+			if(rfork(RFPROC|RFMEM|RFNOWAIT) == 0){
+				for(;;){
+					sleep(1000);
+					if(w->finished || w->alldone)
+						break;
+					if(w->changed)
+						write(kickpipe[1], "C", 1);
+				}
+				_exits(0);
+			}
 			plinitlist(list, PACKN|FILLX, genwww, 8, doprev);
 			if(defdisplay) pldraw(list, screen);
 			setcurrent(i, selection->tag);
@@ -940,10 +953,7 @@ void updtext(Www *w){
 	plsetpostextview(text, w->yoffs);
 	pldraw(root, screen);
 }
-void update(Www *w){
+
-	w->changed = 1;
-	write(kickpipe[1], "C", 1);
-}
 void finish(Www *w){
 	w->finished = 1;
 	write(kickpipe[1], "F", 1);

sys/src/cmd/mothra/mothra.h

@@ -77,7 +77,6 @@ enum{
 	POST,
 };
 
-void update(Www *w);
 void finish(Www *w);
 void plrdhtml(char *, int, Www *);
 void plrdplain(char *, int, Www *);

sys/src/cmd/mothra/rdhtml.c

@@ -98,7 +98,7 @@ void pl_htmloutput(Hglob *g, int nsp, char *s, Field *field){
 			if(g->tp!=g->text && g->tp!=g->etext && g->tp[-1]!=' ')
 				*g->tp++=' ';
 			while(g->tp!=g->etext && *s) *g->tp++=*s++;
-			if(g->state->tag==Tag_title) update(g->dst);
+			if(g->state->tag==Tag_title) g->dst->changed=1;
 			*g->tp='\0';
 		}
 		return;
@@ -149,7 +149,7 @@ void pl_htmloutput(Hglob *g, int nsp, char *s, Field *field){
 		g->state->link[0] || g->state->image[0], ap);
 	g->para=0;
 	g->linebrk=0;
-	update(g->dst);
+	g->dst->changed=1;
 }
 
 /*
@@ -760,10 +760,11 @@ void plrdhtml(char *name, int fd, Www *dst){
 			if((str=strchr(str, '='))==0)
 				break;
 			str++;
+			pl_htmloutput(&g, 0, "[refresh: ", 0);
 			str=unquot(g.state->link, str, sizeof(g.state->link));
-			pl_htmloutput(&g, 0, "refresh: ", 0);
 			pl_htmloutput(&g, 0, str, 0);
 			g.state->link[0]=0;
+			pl_htmloutput(&g, 0, "]", 0);
 			g.linebrk=1;
 			g.spacc=0;
 			break;
@@ -773,17 +774,18 @@ void plrdhtml(char *name, int fd, Www *dst){
 		case Tag_embed:
 		case Tag_frame:
 		case Tag_iframe:
+			snprint(buf, sizeof(buf), "[%s: ", tag[g.tag].name);
+			pl_htmloutput(&g, 0, buf, 0);
 			if(str=pl_getattr(g.attr, "src"))
 				nstrcpy(g.state->link, str, sizeof(g.state->link));
 			if(str=pl_getattr(g.attr, "name"))
 				nstrcpy(g.state->name, str, sizeof(g.state->name));
 			else
 				str = g.state->link;
-			pl_htmloutput(&g, 0, tag[g.tag].name, 0);
-			pl_htmloutput(&g, 0, ": ", 0);
 			pl_htmloutput(&g, 0, str, 0);
 			g.state->link[0]=0;
 			g.state->name[0]=0;
+			pl_htmloutput(&g, 0, "]", 0);
 			g.linebrk=1;
 			g.spacc=0;
 			break;
@@ -1092,7 +1094,6 @@ void plrdhtml(char *name, int fd, Www *dst){
 				htmlerror(g.name, g.lineno,
 					"missing </%s> at EOF", tag[g.state->tag].name);
 		*g.tp='\0';
-		update(dst);
 		getpix(dst->text, dst);
 		finish(dst);
 		return;