Directx11 scale image after AcquireNextFrame()

Question

Directx11 scale image after AcquireNextFrame()

Saloni Jaiswal 1

Suppose desktop resolution is 1366*768, So when we use AcquireNextFrame API it captures frame with dimension 1366*768 but we want to change frame dimension like 800*600 or 1920*1080. Can scaleup and can scaledown. Is there any way to do this. I am trying this is C++.
Please help me in this, Struggling from long time. let me know if more information required.

Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2021-10-25T02:16:56.427+00:00

Have you seen the question? Is It mean to resize?
Saloni Jaiswal 1 Reputation point

2021-10-28T20:01:46.69+00:00

I am not sure the this will work. As We want to capture , resize then send it over network and there it will render.
Saloni Jaiswal 1 Reputation point

2021-10-28T20:06:55.067+00:00

Is there something we can do?
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2021-10-29T07:50:29.243+00:00

I haven‘t seen anything else so far. Perhaps you should have a try.

1 answer

Your answer

Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2021-10-25T02:16:56.427+00:00

Have you seen the question? Is It mean to resize?
Saloni Jaiswal 1 Reputation point

2021-10-28T20:01:46.69+00:00

I am not sure the this will work. As We want to capture , resize then send it over network and there it will render.
Saloni Jaiswal 1 Reputation point

2021-10-28T20:06:55.067+00:00

Is there something we can do?
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2021-10-29T07:50:29.243+00:00

I haven‘t seen anything else so far. Perhaps you should have a try.

Answer 1

Castorix31 91,876

You can create a HBITMAP with CreateDIBSection and copy the bits from the final
D3D11_MAPPED_SUBRESOURCE.pData (from the end as bits are inverted (from image size - RowPitch))
Then you can resize the HBITMAP with StretchBlt

For example, I did a test by dividing the size by 3 from the screencopy with StretchBlt on the main window DC :

Saloni Jaiswal 1 Reputation point

2021-10-28T20:00:03.6+00:00

StretchBlt uses CPU. Is there something we can do with Dxd11. We need to capture, resize and send over network and then render
Castorix31 91,876 Reputation points

2021-10-29T14:20:48.037+00:00

With GPU, I tested with Direct2D, by creating a ID2D1Bitmap from D3D11_MAPPED_SUBRESOURCE.pData
from CreateHwndRenderTarget, then ID2D1RenderTarget::CreateCompatibleRenderTarget
then I get ID2D1DeviceContext to apply a CLSID_D2D1Scale effect with ID2D1DeviceContext::CreateEffect
then I draw with DrawImage(ID2D1Effect)
and I get the final scaled ID2D1Bitmap with ID2D1BitmapRenderTarget::GetBitmap

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Directx11 scale image after AcquireNextFrame()

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