Add API to render a reflection

This is to be used sparingly because the pattern is dynamically
created every time. Mainly for the benefit of some Mixbus
widgets -- compared to ArdourButton::convex_pattern

2 files changed, 15 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/gtkmm2ext/utils.h b/libs/gtkmm2ext/gtkmm2ext/utils.h
index 188da0862d..7e5cc005e0 100644
--- a/libs/gtkmm2ext/gtkmm2ext/utils.h
+++ b/libs/gtkmm2ext/gtkmm2ext/utils.h
@@ -158,6 +158,8 @@ namespace Gtkmm2ext {
 	LIBGTKMM2EXT_API void rounded_right_half_rectangle (cairo_t*, double x, double y, double w, double h, double r=10);
 	LIBGTKMM2EXT_API void rounded_left_half_rectangle (cairo_t* cr, double x, double y, double w, double h, double r=10);
 
+	LIBGTKMM2EXT_API void add_reflection (cairo_t* cr, double w, double h);
+
 	LIBGTKMM2EXT_API Gtk::Label* left_aligned_label (std::string const &);
 	LIBGTKMM2EXT_API Gtk::Label* right_aligned_label (std::string const &);
 
diff --git a/libs/gtkmm2ext/utils.cc b/libs/gtkmm2ext/utils.cc
index bdb44090c3..f97177de9b 100644
--- a/libs/gtkmm2ext/utils.cc
+++ b/libs/gtkmm2ext/utils.cc
@@ -800,6 +800,19 @@ Gtkmm2ext::rounded_top_right_rectangle (cairo_t* cr, double x, double y, double
 	cairo_line_to (cr, x,y); // Line to A
 }
 
+void
+Gtkmm2ext::add_reflection (cairo_t* cr, double w, double h)
+{
+	cairo_pattern_t* convex_pattern = cairo_pattern_create_linear (0.0, 0, 0.3, h * 0.7);
+	cairo_pattern_add_color_stop_rgba (convex_pattern, 0.0,  1, 1, 1, 0.10);
+	cairo_pattern_add_color_stop_rgba (convex_pattern, 0.79, 1, 1, 1, 0.03);
+	cairo_pattern_add_color_stop_rgba (convex_pattern, 1.0,  1, 1, 1, 0.0);
+	cairo_set_source (cr, convex_pattern);
+	Gtkmm2ext::rounded_rectangle (cr, 2, 2, w - 4, h - 4, 4);
+	cairo_fill (cr);
+	cairo_pattern_destroy(convex_pattern);
+}
+
 Glib::RefPtr<Gdk::Window>
 Gtkmm2ext::window_to_draw_on (Gtk::Widget& w, Gtk::Widget** parent)
 {