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how do I copy multible textures to an offscreensurface

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I need to copy multible textures to one offscreensurface I know how to copy one texture to a surface but not two or more textures to a surface. My code might explain it better
hr = g_pd3dDevice->Clear(0,NULL,D3DCLEAR_TARGET| D3DCLEAR_ZBUFFER ,D3DCOLOR_XRGB(0,0,0),1.0f,0);
D3DXMatrixTranslation( &matWorld, 0.0f, 0.0f, 2.5f );
hr = g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );
hr = g_pd3dDevice->SetTextureStageState( 1, D3DTSS_COLOROP, D3DTOP_ADD );
hr = g_pd3dDevice->SetTexture( 0, g_LiveTexture );
hr = g_pd3dDevice->SetTexture( 1, g_Texture[0] );
hr = g_pd3dDevice->SetStreamSource( 0, g_VertexBuffer, 0, (Vertex) );
hr = g_pd3dDevice->SetFVF( Vertex::FVF_Flags );
hr = g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 );
g_pd3dDevice->Present( NULL, NULL, NULL, NULL );

So instead of presenting the two textures g_LiveTexture and g_Texture[0] to the frontbuffer as is in the example I want to copy them to an offscreensurface first so I can use StretchRect(..) so my surfaces fit my window correctly as my window size is not 2 ^ 2

currently i have to use
[font="Consolas"][font="Consolas"]D3DXMatrixPerspectiveFovLH(&matProj,D3DX_PI / 4.0f,aspect,1.0f,100.0f); and change aspect float value to 0.9f but its not an exact fit to my window I guess theres a betterway of doing this if someone could point me into the right direction
thanks[/font][/font] Edited by nchannon

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