Hey guys, I'm pretty new to Direct3D and I try to generate a png image file to disk from a already loaded initialized image from `LPDIRECT3DTEXTURE9` object.

Basically I'm creating a function that get's an std::string for the file destination path and get the pixels from the existing LPDIRECT3DTEXTURE9 object and save them to disk.

Any help would be much appreciated!

Thanks in advance!

EDIT:

I though I should add a sample code of how I do it with BitMap format to get the idea of what I'm trying to do.

Note that this code works, but I try to do something similar with PNG format.

int Width = 128;
int Height = 128;
LPDIRECT3DTEXTURE9 m_lpTexture;
LPDIRECT3DDEVICE9 s_lpD3DDev = NULL;
bool SaveToBitmapFile(const std::string & szPath)
{
	LPDIRECT3DSURFACE9 lpSurfSrc = NULL;
	LPDIRECT3DSURFACE9 lpSurfDst = NULL;

	m_lpTexture->GetSurfaceLevel(0, &lpSurfSrc);
	s_lpD3DDev->CreateOffscreenPlainSurface(Width, 
		Height, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &lpSurfDst, NULL);

	if (D3D_OK != 
		D3DXLoadSurfaceFromSurface(lpSurfDst, NULL, NULL, lpSurfSrc,
			NULL, NULL, D3DX_FILTER_TRIANGLE, 0))
	{
		lpSurfDst->Release(); lpSurfDst = NULL;
		lpSurfSrc->Release(); lpSurfSrc = NULL;
	}

	CBitMapFile myBmp;
	myBmp.Create(Width, Height);

	D3DLOCKED_RECT LR;
	lpSurfDst->LockRect(&LR, NULL, 0);
	for (int y = 0; y < Height; y++)
	{
		BYTE* pPixelsSrc = ((BYTE*)LR.pBits) + y * LR.Pitch;
		BYTE* pPixelsDst = (BYTE*)(myBmp.Pixels(0, y));
		for (int x = 0; x < Width; x++)
		{
			pPixelsDst[0] = pPixelsSrc[0];
			pPixelsDst[1] = pPixelsSrc[1];
			pPixelsDst[2] = pPixelsSrc[2];

			pPixelsSrc += 4;
			pPixelsDst += 3;
		}
	}
	lpSurfDst->UnlockRect();

	lpSurfDst->Release(); lpSurfDst = NULL;
	lpSurfSrc->Release(); lpSurfSrc = NULL;

	HANDLE hFile = ::CreateFile(szPath.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

	DWORD dwRWC = 0;

	WriteFile(hFile, &myBmp.m_Header, sizeof(myBmp.m_Header), &dwRWC, NULL);
	WriteFile(hFile, &myBmp.m_InfoHeader, sizeof(myBmp.m_InfoHeader), &dwRWC, NULL);

	int iWidth = myBmp.Pitch();
	for (int y = myBmp.m_InfoHeader.biHeight - 1; y >= 0; y--)
	 	WriteFile(hFile, (BYTE*)myBmp.m_pPixels + y * iWidth, iWidth, &dwRWC, NULL);
	 
	CloseHandle(hFile);
}