Handle endianness conversion when reading pfm files

openVulkanoCpp/IO/Files/Pfm.hpp

@@ -73,22 +73,34 @@ namespace openVulkanoCpp
 			return inStream;
 		}
 
-		constexpr size_t GetImageSize() const
+		constexpr size_t GetElementCount() const
 		{
-			size_t size = height * width * sizeof(float);
+			size_t size = height * width;
 			if (color) size *= 3;
 			return size;
 		}
 
+		constexpr size_t GetImageSize() const
+		{
+			return GetElementCount() * sizeof(float);
+		}
+
 		static std::pair<PfmHeader, std::unique_ptr<float[]>> ReadImage(std::istream& inStream)
 		{
 			std::pair<PfmHeader, std::unique_ptr<float[]>> image;
 			inStream >> image.first;
+			size_t size = image.first.GetElementCount();
 
 			if (Utils::IsLittleEndian() != image.first.littleEndian)
-				throw std::runtime_error("Conversion support for endianness not implemented");
+			{
+				char* data = reinterpret_cast<char*>(image.second.get());
+				for(size_t i = 0; i < size; i++)
+				{
+					size_t idx = i * sizeof(float);
+					std::reverse(&data[idx], &data[idx + sizeof(float)]);
+				}
+			}
 
-			size_t size = image.first.height * image.first.width;
 			image.second = std::make_unique<float[]>(size);
 			inStream.read(reinterpret_cast<char*>(image.second.get()), size);
 			return image;