Add color component bit count (rBits, gBits, bBits, aBits) and maximum value (rMax, gMax, bMax, aMax) convenience functions to PixelFormat-struct (If someone objects to adding these, holler and/or revert this commit, I can live without 'em but they'd ease some parts of Cine::Palette-code).

svn-id: r39711

1 files changed, 40 insertions, 0 deletions

diff --git a/graphics/pixelformat.h b/graphics/pixelformat.h
index 733499839b..7015f4d66f 100644
--- a/graphics/pixelformat.h
+++ b/graphics/pixelformat.h
@@ -86,6 +86,46 @@ struct PixelFormat {
 		g = ((color >> gShift) << gLoss) & 0xFF;
 		b = ((color >> bShift) << bLoss) & 0xFF;
 	}
+
+	//////////////////////////////////////////////////////////////////////
+	// Convenience functions for getting number of color component bits //
+	//////////////////////////////////////////////////////////////////////
+
+	inline byte rBits() const {
+		return (8 - rLoss);
+	}
+
+	inline byte gBits() const {
+		return (8 - gLoss);
+	}
+
+	inline byte bBits() const {
+		return (8 - bLoss);
+	}
+
+	inline byte aBits() const {
+		return (8 - aLoss);
+	}
+
+	////////////////////////////////////////////////////////////////////////
+	// Convenience functions for getting color components' maximum values //
+	////////////////////////////////////////////////////////////////////////
+
+	inline uint rMax() const {
+		return (1 << rBits()) - 1;
+	}
+
+	inline uint gMax() const {
+		return (1 << gBits()) - 1;
+	}
+
+	inline uint bMax() const {
+		return (1 << bBits()) - 1;
+	}
+
+	inline uint aMax() const {
+		return (1 << aBits()) - 1;
+	}
 };
 
 } // end of namespace Graphics