From b0fd3562cfd94abd9f2a0eb560d6fa72819e76df Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sat, 28 May 2022 20:07:21 +0300
Subject: [PATCH] Add color hex output

---
 libs/gfx/include/psemek/gfx/color.hpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/libs/gfx/include/psemek/gfx/color.hpp b/libs/gfx/include/psemek/gfx/color.hpp
index 8f66532a..b00ea315 100644
--- a/libs/gfx/include/psemek/gfx/color.hpp
+++ b/libs/gfx/include/psemek/gfx/color.hpp
@@ -163,6 +163,33 @@ namespace psemek::gfx
 		};
 	}
 
+	template <std::size_t N>
+	struct as_hex
+	{
+		geom::vector<std::uint8_t, N> color;
+
+		as_hex(geom::vector<std::uint8_t, N> const & color)
+			: color{color}
+		{}
+	};
+
+	template <typename OStream, std::size_t N>
+	OStream & operator << (OStream & os, as_hex<N> const & c)
+	{
+		static auto const hex_v = [](std::uint8_t value) -> char
+		{
+			if (value < 10)
+				return '0' + value;
+			else
+				return 'a' + (value - 10);
+		};
+
+		for (auto v : c.color.coords)
+			os << hex_v(v >> 4) << hex_v(v & 15);
+
+		return os;
+	}
+
 	struct generic_color
 	{
 		color_4f c;