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move contrasting_text_color() into ArdourCanvas

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This commit is contained in:
Paul Davis 2014-06-30 10:38:45 -04:00
parent 46d565e7ed
commit b4aba271f4
6 changed files with 37 additions and 35 deletions
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32
gtk2_ardour/utils.cc
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@ -402,38 +402,6 @@ ARDOUR_UI_UTILS::gdk_color_to_rgba (Gdk::Color const& c)
return RGBA_TO_UINT (r,g,b,a);
}
uint32_t
ARDOUR_UI_UTILS::contrasting_text_color (uint32_t c)
{
double r, g, b, a;
ArdourCanvas::color_to_rgba (c, 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;
/* 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 */
return ArdourCanvas::rgba_to_color (1.0, 1.0, 1.0, 1.0);
} else {
/* use black */
return ArdourCanvas::rgba_to_color (0.0, 0.0, 0.0, 1.0);
}
}
bool
ARDOUR_UI_UTILS::relay_key_press (GdkEventKey* ev, Gtk::Window* win)