Using DirectX 9; Sprite Anti-Aliasing Halo

So I am coding in DirectX 9 and whenever I place a sprite inside of a 2D world. There is a white colored "halo" that appears around the sprite image p. I am using PNGs and the background behind the sprite is transparent. I have also tried using a pink background as well. It seems that the halo only appears on straight lines of pixels but only on some edges. Any help is greatly appreciated!

m_d3d = Direct3DCreate9(D3D_SDK_VERSION); // create the Direct3D interface

D3DPRESENT_PARAMETERS d3dpp; // create a struct to hold various device information

ZeroMemory(&d3dpp, sizeof(d3dpp)); // clear out the struct for use
d3dpp.Windowed = windowed; // is program fullscreen, not windowed?
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;    // discard old frames
d3dpp.hDeviceWindow = hWnd;    // set the window to be used by Direct3D
d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;    // set the back buffer format to 32-bit
d3dpp.BackBufferWidth = screenWidth;    // set the width of the buffer
d3dpp.BackBufferHeight = screenHeight;    // set the height of the buffer
d3dpp.Enabl开发者_如何学PythoneAutoDepthStencil = TRUE;       // automatically run the z-buffer for us
d3dpp.AutoDepthStencilFormat = D3DFMT_D16; // 16-bit pixel format for the z-buffer

// create a device class using this information and the info from the d3dpp stuct
m_d3d->CreateDevice(D3DADAPTER_DEFAULT,
                  D3DDEVTYPE_HAL,
                  hWnd,
                  D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                  &d3dpp,
                  &m_d3ddev);

D3DXCreateSprite(m_d3ddev, &m_d3dspt);    // create the Direct3D Sprite object

LPDIRECT3DTEXTURE9 texture;
D3DXCreateTextureFromFileEx(m_d3ddev, "DC.png", D3DX_DEFAULT, D3DX_DEFAULT,
D3DX_DEFAULT, NULL, D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, D3DX_DEFAULT, 
D3DX_DEFAULT, D3DCOLOR_XRGB(255, 0, 255), NULL, NULL, &texture);

m_d3ddev->BeginScene();

m_d3dspt->Begin(D3DXSPRITE_ALPHABLEND);    // begin sprite drawing with transparency

D3DXVECTOR3 center(0.0f, 0.0f, 0.0f), position((appropriate x), (appropriate y), 1);
m_d3dspt->Draw(texture, NULL, &center, &position, D3DCOLOR_ARGB(255, 255, 255, 255));

m_d3dspt->End();    // end sprite drawing

m_d3ddev->EndScene();

m_d3ddev->Present(NULL, NULL, NULL, NULL);

Thanks Peter

This occurs when you screw up your texture co-ordinates from sprite atlasing and you accidentally run off the texture or on to another texture.

Most commonly, anyway, AFAIK.