Utility/PixelFormat: Add experimental IdentifyFormat method

Only supports RGBA8 for now


Former-commit-id: 8661dc7cab767de5d66efebe5e7038807ba712f7

include/Nazara/Utility/PixelFormat.hpp

@@ -8,6 +8,7 @@
 #define NAZARA_PIXELFORMAT_HPP
 
 #include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/Bitset.hpp>
 #include <Nazara/Core/String.hpp>
 #include <Nazara/Utility/Config.hpp>
 #include <Nazara/Utility/Enums.hpp>
@@ -20,6 +21,34 @@
 
 namespace Nz
 {
+	struct PixelFormatInfo
+	{
+		PixelFormatInfo() :
+		bitsPerPixel(0)
+		{
+		}
+
+		PixelFormatInfo(UInt8 bpp, PixelFormatSubType subType) :
+		bitsPerPixel(bpp),
+		redType(subType),
+		greenType(subType),
+		blueType(subType),
+		alphaType(subType)
+		{
+		}
+
+		// Warning: Bit Endian
+		Bitset<> redMask;
+		Bitset<> greenMask;
+		Bitset<> blueMask;
+		Bitset<> alphaMask;
+		PixelFormatSubType redType;
+		PixelFormatSubType greenType;
+		PixelFormatSubType blueType;
+		PixelFormatSubType alphaType;
+		UInt8 bitsPerPixel;
+	};
+
 	class PixelFormat
 	{
 		friend class Utility;
@@ -41,6 +70,8 @@ namespace Nz
 
 			static bool HasAlpha(PixelFormatType format);
 
+			static PixelFormatType IdentifyFormat(const PixelFormatInfo& info);
+
 			static bool IsCompressed(PixelFormatType format);
 			static bool IsConversionSupported(PixelFormatType srcFormat, PixelFormatType dstFormat);
 			static bool IsValid(PixelFormatType format);

src/Nazara/Utility/PixelFormat.cpp

@@ -1268,6 +1268,22 @@ namespace Nz
 		}
 	}
 
+	PixelFormatType PixelFormat::IdentifyFormat(const PixelFormatInfo& info)
+	{
+		switch (info.bitsPerPixel)
+		{
+			case 32:
+				if (info.redMask   == Bitset<>(0xFF000000) &&
+					info.greenMask == Bitset<>(0x00FF0000) &&
+					info.blueMask  == Bitset<>(0x0000FF00) &&
+					info.alphaMask == Bitset<>(0x000000FF))
+					return PixelFormatType_RGBA8;
+				break;
+		}
+
+		return PixelFormatType_Undefined;
+	}
+
 	bool PixelFormat::Initialize()
 	{
 		// Réinitialisation