Odtnhj

I'm pretty new to Direct3D and I try to generate a png image file to disk from a already loaded initialized image using LPDIRECT3DTEXTURE9 interface. Note that I want to keep the transparency of the loaded image.

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.

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);

From my understanding, I'll need to use

D3DSURFACE_DESC sd;
m_lpTexture->GetLevelDesc(0, &sd);

And generate the headers of the png myself?

Any help would be much appreciated!

Thanks in advance!