[LyX/master] Rename RGBColor to ARGBColor

[Koji Yokota]

commit 79eb823b816562e98b5b0c4b723fe1442a54b0a5
Author: Koji Yokota <yokota at lyx.org>
Date:   Fri May 29 13:55:57 2026 +0900

    Rename RGBColor to ARGBColor
---
 src/Color.cpp   |  6 +++---
 src/ColorCode.h | 10 +++++-----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/Color.cpp b/src/Color.cpp
index 2d77e7b7fb..6c3387fe41 100644
--- a/src/Color.cpp
+++ b/src/Color.cpp
@@ -69,8 +69,8 @@ string const X11hexname(RGBColor const & col)
 
 	ostr << '#' << setbase(16) << setfill('0');
 
-	if (typeid(col) == typeid(RGBAColor))
-		ostr << setw(2) << ((RGBAColor const &)col).a;
+	if (typeid(col) == typeid(ARGBColor))
+		ostr << setw(2) << ((ARGBColor const &)col).a;
 
 	ostr << setw(2) << col.r
 	     << setw(2) << col.g
@@ -91,7 +91,7 @@ RGBColor rgbFromHexName(string const & x11hexname)
 		c.b = hexstrToInt(x11hexname.substr(5, 2));
 		return c;
 	} else {
-		RGBAColor c;
+		ARGBColor c;
 		c.a = hexstrToInt(x11hexname.substr(1, 2));
 		c.r = hexstrToInt(x11hexname.substr(3, 2));
 		c.g = hexstrToInt(x11hexname.substr(5, 2));
diff --git a/src/ColorCode.h b/src/ColorCode.h
index 5c5b9cd039..3492498746 100644
--- a/src/ColorCode.h
+++ b/src/ColorCode.h
@@ -272,10 +272,10 @@ struct RGBColor {
 		: r(red), g(green), b(blue) {}
 };
 
-struct RGBAColor : public RGBColor {
+struct ARGBColor : public RGBColor {
 	unsigned int a;
-	RGBAColor() : RGBColor(), a(255) {}
-	RGBAColor(unsigned int red, unsigned int green, unsigned int blue,
+	ARGBColor() : RGBColor(), a(255) {}
+	ARGBColor(unsigned int red, unsigned int green, unsigned int blue,
 	          unsigned int alpha = 255)
 		: RGBColor(red, green, blue), a(alpha) {}
 };
@@ -292,13 +292,13 @@ inline bool operator!=(RGBColor const & c1, RGBColor const & c2)
 }
 
 
-inline bool operator==(RGBAColor const & c1, RGBAColor const & c2)
+inline bool operator==(ARGBColor const & c1, ARGBColor const & c2)
 {
 	return (c1.r == c2.r && c1.g == c2.g && c1.b == c2.b && c1.a == c2.a);
 }
 
 
-inline bool operator!=(RGBAColor const & c1, RGBAColor const & c2)
+inline bool operator!=(ARGBColor const & c1, ARGBColor const & c2)
 {
 	return !(c1 == c2);
 }