overlay: Wrap the colour index around the rgba array

And stop assigning colours beyond the end of the array. Still needs a
better method for colour assignment, big list of good colours & ida?

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/overlay/overlay.c b/overlay/overlay.c
index 070cd04..fbec7e8 100644 (file)
--- a/overlay/overlay.c
+++ b/overlay/overlay.c
@@ -263,7 +263,7 @@ static void show_gpu_perf(struct overlay_context *ctx, struct overlay_gpu_perf *
                                              rgba[last_color][1],
                                              rgba[last_color][2],
                                              rgba[last_color][3]);
-                       last_color++;
+                       last_color = (last_color + 1) % 4;
                        chart_set_stroke_width(comm->user_data, 1);
                }