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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 4c1f4011fd
commit 471570705d
6 changed files with 37 additions and 35 deletions
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2
gtk2_ardour/editor_group_tabs.cc
View file

@ -114,7 +114,7 @@ EditorGroupTabs::draw_tab (cairo_t* cr, Tab const & tab) const
cairo_text_extents_t ext;
cairo_text_extents (cr, tab.group->name().c_str(), &ext);
ArdourCanvas::Color c = contrasting_text_color (ArdourCanvas::rgba_to_color (r, g, b, a));
ArdourCanvas::Color c = ArdourCanvas::contrasting_text_color (ArdourCanvas::rgba_to_color (r, g, b, a));
ArdourCanvas::color_to_rgba (c, r, g, b, a);
cairo_set_source_rgb (cr, r, g, b);

2
gtk2_ardour/mixer_group_tabs.cc
View file

@ -121,7 +121,7 @@ MixerGroupTabs::draw_tab (cairo_t* cr, Tab const & tab) const
cairo_text_extents_t ext;
cairo_text_extents (cr, tab.group->name().c_str(), &ext);
ArdourCanvas::Color c = contrasting_text_color (ArdourCanvas::rgba_to_color (r, g, b, a));
ArdourCanvas::Color c = ArdourCanvas::contrasting_text_color (ArdourCanvas::rgba_to_color (r, g, b, a));
ArdourCanvas::color_to_rgba (c, r, g, b, a);
cairo_set_source_rgb (cr, r, g, b);

2
gtk2_ardour/time_axis_view_item.cc
View file

@ -699,7 +699,7 @@ TimeAxisViewItem::set_name_text_color ()
f = get_fill_color ();
}
name_text->set_color (contrasting_text_color (f));
name_text->set_color (ArdourCanvas::contrasting_text_color (f));
}
uint32_t

32
gtk2_ardour/utils.cc
View file

@ -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)

2
libs/canvas/canvas/utils.h
View file

@ -31,5 +31,7 @@ namespace ArdourCanvas {
extern LIBCANVAS_API void set_source_rgba (Cairo::RefPtr<Cairo::Context>, Color);
Distance LIBCANVAS_API distance_to_segment_squared (Duple const & p, Duple const & p1, Duple const & p2, double& t, Duple& at);
uint32_t LIBCANVAS_API contrasting_text_color (uint32_t c);
}

32
libs/canvas/utils.cc
View file

@ -220,3 +220,35 @@ ArdourCanvas::distance_to_segment_squared (Duple const & p, Duple const & p1, Du
return ((dpqx * dpqx) + (dpqy * dpqy));
}
uint32_t
ArdourCanvas::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);
}
}