fix bars in process graph without -F (#11)

Filtered-out processes were still painted if they had no parent. This
resulted in process graph being trimmed too much.

Also, fix height of the whole graph canvas (the process graph was still
sometimes trimmed too much at the bottom; the reason seems to be
off-by-one error when counting CPU graphs).

Author: akavel

src/svg.c

@@ -90,7 +90,7 @@ static void svg_header(FILE *of, struct list_sample_data *head, double graph_sta
         /* height is variable based on pss, psize, ksize */
         h = 400.0 + (arg_scale_y * 30.0) /* base graphs and title */
             + (arg_pss ? (100.0 * arg_scale_y) + (arg_scale_y * 7.0) : 0.0) /* pss estimate */
-            + psize + ksize + esize + (n_cpus * 15 * arg_scale_y);
+            + psize + ksize + esize + ((n_cpus+1) * 15 * arg_scale_y);
 
         fprintf(of, "<?xml version=\"1.0\" standalone=\"no\"?>\n");
         fprintf(of, "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" ");
@@ -1056,6 +1056,8 @@ static void svg_ps_bars(FILE *of,
                                         ps->parent->pos_x,
                                         ps->parent->pos_y);
                         continue;
+                } else {
+                        continue;
                 }
 
                 endtime = ps->last->sampledata->sampletime;