directx - How do I stretch a sub-region of a ID3D11Texture2D? -

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my component given source id3d11texture2d buffer that, of time, copy staging id3d11texture2d buffer using id3d11devicecontext::copyresource. these 2 buffers same size.

sometimes, want copy rectangular sub-region of source buffer staging buffer , stretch staging buffer still same size. rectangular sub-region has same aspect ratio source.

the staging buffer never used rendering. it's saved media file.


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