A problem about directX texture.

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LPDIRECT3DSURFACE9 g_pSurface;
LPVOID pBits// a pointer point to a HBITMAP;
LPDIRECT3DTEXTURE9 g_pTexture=NULL;//The size of the texture is equal to the surface;

C++

g_pd3dDevice->GetFrontBufferData(0, g_pSurface);
D3DLOCKED_RECT	lockedRect;
D3DLOCKED_RECT	lockedTexRect;
if(FAILED(g_pSurface>LockRect(&lockedRect,NULL,
D3DLOCK_NO_DIRTY_UPDATE|D3DLOCK_NOSYSLOCK|D3DLOCK_READONLY)))
				{
					ErrorMessage("LockRect Failed!");	break;
				}
for(int i=0;i<g_ScreenRect.bottom;i++)
{
memcpy((BYTE*)pBits+(g_ScreenRect.bottom-i-1)*g_ScreenRect.right*BITSPERPIXEL/8,						(BYTE*)lockedRect.pBits+i*lockedRect.Pitch,g_ScreenRect.right*BITSPERPIXEL/8);
}
if(FAILED(hr=g_pTexture->LockRect(0,&lockedTexRect,
NULL,0)))
				{break;}
memcpy(lockedTexRect.pBits,lockedRect.pBits,lockedTexRect.Pitch*g_ScreenRect.Bottom);

pSurface->UnlockRect();
g_pTexture->UnlockRect(0);

I can draw the HBITMAP success,but the texture is worse.
Is there any wrong with the memcpy function to texture?

Posted 30-Mar-13 19:49pm

liaoyuandeyehuo

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Maxim Kartavenkov · Answer 1 · 2013-03-30T22:05:00

1. GetFrontBufferData does not recommended to use as it slow.
2. You are getting screen into system memory and what for you copy it back to the texture?
3. You copy via Locking which is not good.

To solve your issues see:
This API D3DXLoadSurfaceFromSurface usd to copy from one surface to another at any surface loacation and colorspace conversion due that it maybe slow. In case if the surfaces are both on GPU memory used StretchRect method - but see the remarks to that method they are important. If you need update surface on texture from system memory and the texture on GPU used UpdateSurface. To get surface of the texture used GetSurfaceLevel method of the texture.

Related to the screen capture see my answer here: Taking Screenshot using DirectX9[^]

Regards,
Maxim.