Optimize pixel calculations.

src/conio/x_events.c

@@ -456,6 +456,7 @@ static void local_draw_rect(struct rectlist *rect)
 	int ctop = rect->rect.height;
 	int cbottom = -1;
 	int idx;
+	uint32_t last_pixel = 0x55555555;
 
 	if (bitmap_width != cleft || bitmap_height != ctop)
 		return;
@@ -487,8 +488,8 @@ static void local_draw_rect(struct rectlist *rect)
 					continue;
 				}
 			}
-			for(yscale=0; yscale<x_cvstat.scaling*x_cvstat.vmultiplier; yscale++) {
-				for(xscale=0; xscale<x_cvstat.scaling; xscale++) {
+			if (last_pixel != rect->data[idx]) {
+				last_pixel = rect->data[idx];
 				r = rect->data[idx] >> 16 & 0xff;
 				g = rect->data[idx] >> 8 & 0xff;
 				b = rect->data[idx] & 0xff;
@@ -508,6 +509,9 @@ static void local_draw_rect(struct rectlist *rect)
 					pixel |= (b << b_shift) & visual.blue_mask;
 				else
 					pixel |= (b >> (0-b_shift)) & visual.blue_mask;
+			}
+			for(yscale=0; yscale<x_cvstat.scaling*x_cvstat.vmultiplier; yscale++) {
+				for(xscale=0; xscale<x_cvstat.scaling; xscale++) {
 #ifdef XPutPixel
 					XPutPixel(xim,(x+rect->rect.x)*x_cvstat.scaling+xscale,(y+rect->rect.y)*x_cvstat.scaling*x_cvstat.vmultiplier+yscale,pixel);
 #else