From d85e3b72d24998e52030b602b86b2b0a09138a9b Mon Sep 17 00:00:00 2001
From: Kari Salminen
Date: Fri, 27 Mar 2009 20:56:15 +0000
Subject: 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
---
 graphics/pixelformat.h | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'graphics/pixelformat.h')

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
-- 
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