Add: A 32 bpp blitter that uses the animation buffer from the video backend to speed up palette animation.

src/blitter/32bpp_base.hpp

@@ -124,6 +124,18 @@ public:
 		return ((r * 13063) + (g * 25647) + (b * 4981)) / 65536;
 	}
 
+	/**
+	 * Make a colour dark grey, for specialized 32bpp remapping.
+	 * @param colour the colour to make dark.
+	 * @return the new colour, now darker.
+	 */
+	static inline Colour MakeDark(Colour colour)
+	{
+		uint8 d = MakeDark(colour.r, colour.g, colour.b);
+
+		return Colour(d, d, d);
+	}
+
 	/**
 	 * Make a colour grey - based.
 	 * @param colour the colour to make grey.
@@ -154,6 +166,16 @@ public:
 
 		return ReallyAdjustBrightness(colour, brightness);
 	}
+
+	static inline uint8 GetColourBrightness(Colour colour)
+	{
+		uint8 rgb_max = std::max(colour.r, std::max(colour.g, colour.b));
+
+		/* Black pixel (8bpp or old 32bpp image), so use default value */
+		if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
+
+		return rgb_max;
+	}
 };
 
 #endif /* BLITTER_32BPP_BASE_HPP */