+
+ double r, g, b, a;
+
+ const double black_r = 0.0;
+ const double black_g = 0.0;
+ const double black_b = 0.0;
+
+ const double white_r = 1.0;
+ const double white_g = 1.0;
+ const double white_b = 1.0;
+
+ uint32_t f;
+
+ if (Config->get_show_name_highlight()) {
+ /* name text will always be on top of name highlight, which
+ will always use our fill color.
+ */
+ f = fill_color;
+ } else {
+ /* name text will be on top of the item, whose color
+ may vary depending on various conditions.
+ */
+ f = get_fill_color ();
+ }
+
+ ArdourCanvas::color_to_rgba (f, r, g, b, a);
+
+ /* Use W3C contrast guideline calculation */
+
+ double white_contrast = (max (r, white_r) - min (r, white_r)) +
+ (max (g, white_g) - min (g, white_g)) +
+ (max (b, white_b) - min (b, white_b));
+
+ double black_contrast = (max (r, black_r) - min (r, black_r)) +
+ (max (g, black_g) - min (g, black_g)) +
+ (max (b, black_b) - min (b, black_b));
+
+ if (white_contrast > black_contrast) {
+ /* use white */
+ name_text->set_color (ArdourCanvas::rgba_to_color (1.0, 1.0, 1.0, 1.0));
+ } else {
+ /* use black */
+ name_text->set_color (ArdourCanvas::rgba_to_color (0.0, 0.0, 0.0, 1.0));
+ }
+}
+
+uint32_t
+TimeAxisViewItem::get_fill_color () const
+{
+ uint32_t f;
+ uint32_t o;