Image to Texture on UE4

AddToYourCppFile.cpp

static EImageFormat::Type GetJoyImageFormat(EJoyImageFormats JoyFormat)
{
	switch (JoyFormat) {
	case EJoyImageFormats::JPG: return EImageFormat::JPEG;
	case EJoyImageFormats::PNG: return EImageFormat::PNG;
	case EJoyImageFormats::BMP: return EImageFormat::BMP;
	case EJoyImageFormats::ICO: return EImageFormat::ICO;
	case EJoyImageFormats::EXR: return EImageFormat::EXR;
	case EJoyImageFormats::ICNS: return EImageFormat::ICNS;
	}

	return EImageFormat::JPEG;
}

static FString GetJoyImageExtension(EJoyImageFormats JoyFormat)
{
	switch (JoyFormat) {
	case EJoyImageFormats::JPG: return ".jpg";
	case EJoyImageFormats::PNG: return ".png";
	case EJoyImageFormats::BMP: return ".bmp";
	case EJoyImageFormats::ICO: return ".ico";
	case EJoyImageFormats::EXR: return ".exr";
	case EJoyImageFormats::ICNS: return ".icns";
	}
	return ".png";
}

UTexture2D* UHitMeSingleton::LoadTexture2DFromFile(const FString& FileName, EJoyImageFormats ImageFormat, bool& IsValid, int32& Width, int32& Height)
{
	IsValid = false;
	UTexture2D* LoadedT2D = NULL;

	bool isOK = UWebImageDownloader::CreateWebImageFolder();
	if (!isOK) return LoadedT2D;

	IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked<IImageWrapperModule>(FName("ImageWrapper"));
	IImageWrapperPtr ImageWrapper = ImageWrapperModule.CreateImageWrapper(GetJoyImageFormat(ImageFormat));

	//Load From File
	FString FullFilePath = UWebImageDownloader::WebImageFolder() + "/" + FileName + GetJoyImageExtension(ImageFormat);
	TArray<uint8> RawFileData;
	if (!FFileHelper::LoadFileToArray(RawFileData, *FullFilePath)) return NULL;

	//Create T2D!
	if (ImageWrapper.IsValid() && ImageWrapper->SetCompressed(RawFileData.GetData(), RawFileData.Num()))
	{
		const TArray<uint8>* UncompressedBGRA = NULL;
		if (ImageWrapper->GetRaw(ERGBFormat::BGRA, 8, UncompressedBGRA))
		{
			LoadedT2D = UTexture2D::CreateTransient(ImageWrapper->GetWidth(), ImageWrapper->GetHeight(), PF_B8G8R8A8);

			//Valid?
			if (!LoadedT2D) return NULL;
			//~~~~~~~~~~~~~~

			//Out!
			Width = ImageWrapper->GetWidth();
			Height = ImageWrapper->GetHeight();

			//Copy!
			void* TextureData = LoadedT2D->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
			FMemory::Memcpy(TextureData, UncompressedBGRA->GetData(), UncompressedBGRA->Num());
			LoadedT2D->PlatformData->Mips[0].BulkData.Unlock();

			//Update!
			LoadedT2D->UpdateResource();
		}
	}

	// Success!
	IsValid = true;
	return LoadedT2D;
}

AddToYourHeaderFile.h

UENUM(BlueprintType)
enum class EJoyImageFormats : uint8
{
	JPG		UMETA(DisplayName = "JPG"),
	PNG		UMETA(DisplayName = "PNG"),
	BMP		UMETA(DisplayName = "BMP"),
	ICO		UMETA(DisplayName = "ICO"),
	EXR		UMETA(DisplayName = "EXR"),
	ICNS	UMETA(DisplayName = "ICNS")
};