- if (name_text) {
- 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;
-
- ArdourCanvas::color_to_rgba (fill_color, 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));
- }
-
-#if 0
- double h, s, v;
-
- ArdourCanvas::color_to_hsv (fill_color, h, s, v);
-
- if (v == 0.0) {
- /* fill is black, set text to white */
- name_text->set_color (ArdourCanvas::rgba_to_color (1.0, 1.0, 1.0, 1.0));
- } else if (v == 1.0) {
- /* fill is white, set text to black */
- name_text->set_color (ArdourCanvas::rgba_to_color (0.0, 0.0, 0.0, 1.0));
- } else {
-
- h = fabs (fmod ((h - 180), 360.0)); /* complementary color */
- s = 1.0; /* fully saturate */
- v = 0.9; /* increase lightness/brightness/value */
-
- name_text->set_color (ArdourCanvas::hsv_to_color (h, s, v, 1.0));
- }
-#endif
-
- }