IDirect3DSurface9

// Assume _surface is a pointer to an IDirect3DSurface9 interface.
// Assumes a 32-bit pixel format for each pixel.
// Get the surface description.
D3DSURFACE_DESC surfaceDesc;
_surface->GetDesc(&surfaceDesc);
// Get a pointer to the surface pixel data.
D3DLOCKED_RECT lockedRect;
_surface->LockRect(
&lockedRect,// pointer to receive locked data
0, // lock entire surface
0); // no lock flags specified
// Iterate through each pixel in the surface and set it to red.
DWORD* imageData = (DWORD*)lockedRect.pBits;
for(int i = 0; i < surfaceDesc.Height; i++)
{
for(int j = 0; j < surfaceDesc.Width; j++)
{
// index into texture, note we use the pitch and divide by
// four since the pitch is given in bytes and there are
// 4 bytes per DWORD.
int index = i * lockedRect.Pitch / 4 + j;
imageData[index] = 0xffff0000; // red
}
}
_surface->UnlockRect();

typedef struct _D3DLOCKED_RECT {
INT Pitch; // the surface pitch
void *pBits; // pointer to the start of the surface memory
} D3DLOCKED_RECT;