construct vectorized Zoom Icons

libs/gtkmm2ext/ardour_icon.cc

@@ -414,9 +414,81 @@ Gtkmm2ext::ArdourIcon::render (cairo_t *cr,
 
 	}
 	break;
+	case ZoomIn:
+	case ZoomOut:
+	case ZoomFull:
+	{
+		const double x = width * .5;
+		const double y = height * .5;
+		const double r = std::min (x, y) * .7;
+		const double wh = std::min (x, y) * .45;
+
+		// draw handle first
+#define LINE45DEG(rad) \
+		x + r * (rad) * .707, y + r * (rad) * .707 // sin(45deg) = cos(45deg) = .707
+		cairo_move_to (cr, LINE45DEG(.9));
+		cairo_line_to (cr, LINE45DEG(1.3));
+		cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+		cairo_set_line_width (cr, 3.0);
+		cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
+		cairo_stroke (cr);
+#undef LINE45DEG
+
+		// lens
+		ardour_canvas_set_source_rgba (cr, fg_color);
+		cairo_arc (cr, x, y, r, 0, 2 * M_PI);
+		cairo_fill_preserve (cr);
+
+		// add a lens gradient
+		cairo_pattern_t *lens;
+		lens = cairo_pattern_create_radial (x - r, y - r, r * .5, x - r, y - r, r * 2);
+		cairo_pattern_add_color_stop_rgba (lens, 0, 1, 1, 1, .4);
+		cairo_pattern_add_color_stop_rgba (lens, 1, 0, 0, 0, .4);
+		cairo_set_source (cr, lens);
+		cairo_fill_preserve (cr);
+		cairo_pattern_destroy (lens);
+
+		// outline
+		cairo_set_line_width (cr, 1.5);
+		cairo_set_source_rgba (cr, .0, .0, .0, .8);
+		cairo_stroke (cr);
+
+		// add "+", "-" or "[]"
+		cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+		cairo_set_line_width (cr, 1.5);
+		cairo_set_source_rgba (cr, 0, 0, 0, 1.0);
+
+		if (icon == ZoomIn || icon == ZoomOut) {
+			cairo_move_to (cr, x - wh, y);
+			cairo_line_to (cr, x + wh, y);
+			cairo_stroke (cr);
+		}
+		if (icon == ZoomIn) {
+			cairo_move_to (cr, x, y - wh);
+			cairo_line_to (cr, x, y + wh);
+			cairo_stroke (cr);
+		}
+		if (icon == ZoomFull) {
+			const double br0 = std::min (x, y) * .1;
+			const double br1 = std::min (x, y) * .3;
+			const double bry = std::min (x, y) * .3;
+			cairo_move_to (cr, x - br0, y - bry);
+			cairo_line_to (cr, x - br1, y - bry);
+			cairo_line_to (cr, x - br1, y + bry);
+			cairo_line_to (cr, x - br0, y + bry);
+			cairo_stroke (cr);
+
+			cairo_move_to (cr, x + br0, y - bry);
+			cairo_line_to (cr, x + br1, y - bry);
+			cairo_line_to (cr, x + br1, y + bry);
+			cairo_line_to (cr, x + br0, y + bry);
+			cairo_stroke (cr);
+		}
+	}
+	break;
 	default:
 		return false;
-	} // end case(icon)
+	} // end switch (icon)
 
 #undef VECTORICONSTROKEFILL
 #undef VECTORICONSTROKEOUTLINE

libs/gtkmm2ext/gtkmm2ext/ardour_icon.h

@@ -23,6 +23,9 @@ namespace Gtkmm2ext { namespace ArdourIcon {
 		TransportMetronom,
 		NudgeLeft,
 		NudgeRight,
+		ZoomIn,
+		ZoomOut,
+		ZoomFull,
 	};
 
 	bool render (cairo_t *cr,