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mothra: cache backup bitmap in pl_rtdraw()

--- a/sys/src/cmd/mothra/libpanel/rtext.c

+++ b/sys/src/cmd/mothra/libpanel/rtext.c

@@ -164,14 +164,18 @@

 }

 void pl_rtdraw(Image *b, Rectangle r, Rtext *t, int yoffs){

+	static Image *backup;

 	Point offs, lp;

 	Rectangle dr;

 	Image *bb;

 	bb = b;

-	if((b = allocimage(display, r, bb->chan, 0, DNofill)) == nil)

-		b = bb;

-

+	if(backup==0 || rectinrect(r, backup->r)==0){

+		freeimage(backup);

+		backup=allocimage(display, bb->r, bb->chan, 0, DNofill);

+	}

+	if(backup)

+		b=backup;

 	pl_clr(b, r);

 	lp=ZP;

 	offs=subpt(r.min, Pt(0, yoffs));

@@ -188,7 +192,7 @@

 			else if(t->p){

 				plmove(t->p, subpt(dr.min, t->p->r.min));

 				pldraw(t->p, b);

-				if(b != bb)

+				if(b!=bb)

 					pl_stuffbitmap(t->p, bb);

 			}

 			else{

@@ -208,11 +212,8 @@

 			lp=ZP;

 		}

 	}

-

-	if(b != bb){

-		draw(bb, r, b, 0, b->r.min);

-		freeimage(b);

-	}

+	if(b!=bb)

+		draw(bb, r, b, 0, r.min);

 }

 /*

  * Reposition text already drawn in the window.

-- 

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