In DirectX, I can StretchRect between D3DPOOL_DEFAULT, but how can I stretch between managed pool? or from managed pool to default pool? I want to upload a texture into a managed pool, and scale it smaller into another texture, either managed or in video memory. I tried GetDC() of the two texture then StretchBlt(hdcSource, hdcDest), the texture is scaled, but somehow lots of color noise comes out, though the formats of textures are the same.