Proper way to convert from UTextureRenderTarget2D into UTexture2D?

Development Rendering
, , , , , ,
1

Hello,
I want to convert a captured screen of game into UTexture2D. Here’s what has been done.

I have inherited a custom class AScreenCapture2D from ASceneCapture2D, with member

UPROPERTY()
        UTexture2D* m_photo;

and added these functions.

void AScreenCapture2D::SetRenderedTexture()
{
    USceneCaptureComponent2D* captureComponent = GetCaptureComponent2D();
    UTextureRenderTarget2D* renderTarget = captureComponent->TextureTarget;
    checkf(renderTarget != nullptr, TEXT("renderTarget is null"));

    captureComponent->UpdateContent();

    m_photo = ConvertRenderTargetToTexture2D(renderTarget);
    checkf(m_photo != nullptr, TEXT("photo is null"));
}

UTexture2D* AScreenCapture2D::ConvertRenderTargetToTexture2D(UTextureRenderTarget2D* TextureRenderTarget)
{
    // Creates Texture2D to store TextureRenderTarget content
    UTexture2D *Texture = UTexture2D::CreateTransient(TextureRenderTarget->SizeX, TextureRenderTarget->SizeY);
#if WITH_EDITORONLY_DATA
    Texture->MipGenSettings = TMGS_NoMipmaps;
#endif
    Texture->SRGB = false;
    Texture->CompressionSettings = TextureCompressionSettings::TC_VectorDisplacementmap;

    // Read the pixels from the RenderTarget and store them in a FColor array
    TArray<FColor> SurfData;
    FRenderTarget *RenderTarget = TextureRenderTarget->GameThread_GetRenderTargetResource();
    RenderTarget->ReadPixels(SurfData);

    // Lock and copies the data between the textures
    void* TextureData = Texture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
    const int32 TextureDataSize = SurfData.Num() * 4;
    FMemory::Memcpy(TextureData, SurfData.GetData(), TextureDataSize);
    Texture->PlatformData->Mips[0].BulkData.Unlock();
    // Apply Texture changes to GPU memory
    Texture->UpdateResource();

    return Texture;
}

UTexture2D* AScreenCapture2D::GetRenderedTexture() const
{
    checkf(m_photo != nullptr, TEXT("photo is null"));

    return m_photo;
}

The second function I found from one of answers here, and adapted it a little bit.

Now for testing purposes I made a UMG widget with initial white image and tried to render that UTexture2D photo.

139283-capture0.png
139283-capture0.png883×371 69.9 KB

The code above works for windows with editor, but fails on android. The white colored background image disappears, and I get a transparent image.

This is the changed settings of UTextureRenderTarget2D

139285-capture1.png

So if this method is a correct way to convert UTextureRenderTarget2D into UTexture2D, then how to fix this issue with android rendering?
If not, then what’s the proper way for conversion?

P.S: I know about ConstructTexture2D, but it works only with editor.