Implement cout support for Color4, and some other minor utility.

include/Color4.hpp

@@ -23,7 +23,8 @@ void print_builtin_color_list();
 /// A type representing a color with alpha.
 /// Our default format is RGBA with 8 bits-per-channel.
 /// Conversions to other color formats are provided.
-class Color4 {
+class Color4
+{
 public:
     u8 r;
     u8 g;
@@ -83,6 +84,7 @@ public:
     static Color4 FromLCH(float l, float c, float h, float alpha = 1.f);
 public:
 
+    /// Performs the interpolation in normalized color space (0-1) and converts it back.
     [[nodiscard]] Color4 Lerp(const Color4& rhs, float t) const;
     static Color4 Lerp(const Color4& lhs, const Color4& rhs, float t);
 
@@ -136,4 +138,12 @@ public:
     [[nodiscard]] std::string BGEscapeCode(bool bold = false);
 
 
+    bool operator==(const Color4& rhs) const;
+
+    bool operator!=(const Color4& rhs) const;
 };
+
+inline std::ostream& operator << (std::ostream& os, const Color4& c) {
+    os << "Color4(" << c.r << "," << c.g << "," << c.b << "," << c.a << ") AKA " << c.ToHex();
+    return os;
+}

src/Color4.cpp

@@ -182,7 +182,7 @@ Color4 Color4::FromNormalized(float red, float green, float blue, float alpha) {
 
 Color4 Color4::Lerp(const Color4 &rhs, float t) const {
 
-    /// Performs the interpolation in normalized color space (0-1) and converts it back.
+
 
 
 
@@ -342,6 +342,19 @@ std::string Color4::BGEscapeCode(bool bold) {
     return EscapeCode(true, bold);
 }
 
+bool Color4::operator==(const Color4& rhs) const
+{
+    return r == rhs.r
+        && g == rhs.g
+        && b == rhs.b
+        && a == rhs.a;
+}
+
+bool Color4::operator!=(const Color4& rhs) const
+{
+    return !(*this == rhs);
+}
+
 static std::string decimal_to_hex(int dec)
 {
     if (dec < 1) return "00";