ddraw Yuv 显示问题，拖动屏幕图像晃动！
(1)yuv overlay 时，显示在mfc的picture控件上，然后我拖动对话框，发现yuv overlay的表面有时会拖出picture控件，即图像出现晃动现象；
(2)还有一个问题就是当我将MFC对话框拖出屏幕范围，yuv overlay的表面还是在屏幕的范围内；即当MFC对话框部分拖出屏幕范围时，overlay的图像不会跟踪只显示部分图像；
(3)还有就是当切换到另一个页面的时候，此时对话框看不到，但是yuv overlay的表面还是显示在屏幕上；
我用的函数是UpdateOverlay函数；源码如下：
//初始化表面函数
HRESULT CDirectDrawSurface::DirectDrawInit(HWND hWnd, int width, int height)
{
HRESULT hr=S_FALSE;
hr=CoInitialize(0);
DDSURFACEDESC2 ddsd;
//store width, height
m_width = width;
m_height = height;
hr = CoCreateInstance(CLSID_DirectDraw,
NULL, CLSCTX_ALL, IID_IDirectDraw7, (LPVOID *)&m_lpDD);
if(!FAILED(hr))
hr = IDirectDraw7_Initialize(m_lpDD, NULL);
if (hr!=DD_OK)
{
printf("create directdraw object failed\n");
}
if(m_lpDD->SetCooperativeLevel(m_hWnd,DDSCL_NORMAL)!=DD_OK)
return S_FALSE;
memset( &ddsd, 0, sizeof(DDSURFACEDESC2) );
ddsd.dwSize = sizeof(DDSURFACEDESC2);
ddsd.dwFlags = DDSD_CAPS;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
// The primary surface is not a page flipping surface this time
hr = m_lpDD->CreateSurface( &ddsd, &m_lpDDSPrimary, NULL );
if (hr!=DD_OK)
{
printf("create directdraw surface failed\n");
}
else
{
DDCAPS capsDrv;
memset(&capsDrv,0,sizeof(capsDrv));
capsDrv.dwSize=sizeof(DDCAPS);
hr=m_lpDD-> GetCaps(&capsDrv,NULL);
if(hr==DD_OK && (capsDrv.dwCaps & DDCAPS_OVERLAY))
{ // determine Overlay support.
DDPIXELFORMAT PixelFormat[] = {
//{ sizeof(DDPIXELFORMAT), DDPF_FOURCC, FOURCC_YV12, 0, 0, 0, 0, 0 }, // YV12
//{ sizeof(DDPIXELFORMAT), DDPF_FOURCC, FOURCC_Y411, 0, 0, 0, 0, 0 }, // Y411
{ sizeof(DDPIXELFORMAT), DDPF_FOURCC, FOURCC_YUY2, 0, 0, 0, 0, 0 }, // YUY2
{ sizeof(DDPIXELFORMAT), DDPF_FOURCC, FOURCC_UYVY, 0, 0, 0, 0, 0 } // UYVY
};
int i, nPixelFormat=sizeof(PixelFormat)/sizeof(DDPIXELFORMAT);
//创建覆盖表面
ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
ddsd.ddsCaps.dwCaps = DDSCAPS_OVERLAY|DDSCAPS_VIDEOMEMORY; // Overlay related APIs will fail without hardware support.
ddsd.dwWidth=1628;
ddsd.dwHeight=1236;
for(i=0;i <nPixelFormat;i++)
{
memcpy(&ddsd.ddpfPixelFormat,&PixelFormat[i],sizeof(DDPIXELFORMAT));
hr=m_lpDD-> CreateSurface(&ddsd,&m_lpDDSOverlay,NULL);
if(hr==DD_OK) {
char tmpBuf[256];
sprintf(tmpBuf, "创建第%d种OVERLAY表面成功 ! ",i);
::MessageBox(NULL,tmpBuf, "DirectDraw初始化 ",MB_ICONINFORMATION);
break;
}
}
}
}
if ((hr = m_lpDD->CreateClipper(0, &m_lpClipper, NULL)) != DD_OK ||
(hr = m_lpClipper->SetHWnd(0, hWnd) ) != DD_OK ||
(hr = m_lpDDSPrimary->SetClipper(m_lpClipper) ) != DD_OK)
{
if (m_lpDDSPrimary != NULL)
{
m_lpDDSPrimary->Release();
m_lpDDSPrimary = NULL;
}
m_hWnd = hWnd;
return DD_OK;
}
m_hWnd = hWnd;
return hr;
}
//UpdateOverlay更新刷新表面函数：
RECT PicRect,ScreenRect;//图像区域与屏幕显示区域;
HRESULT CDirectDrawSurface::DrawYuvToOverlaySurface(RECT ScreenRect,BYTE *YuvBuf,int width,int height)
{
BYTE *pSurf;
DDSURFACEDESC2 ddsd;
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize=sizeof(ddsd);
POINT p = {0, 0};
TRACE("lpitch%d\n",ddsd.lPitch);
GetClientRect(m_hWnd, &ScreenRect);
ClientToScreen(m_hWnd, &p);
OffsetRect(&ScreenRect, p.x, p.y);
if(FAILED(m_lpDDSOverlay->Lock(NULL,&ddsd,DDLOCK_SURFACEMEMORYPTR|DDLOCK_WAIT,NULL)))
return S_FALSE; //锁定DirectDraw表面;
pSurf=(LPBYTE)ddsd.lpSurface;//获得Overlay表面被锁区域左上角的地址;
if (pSurf)
{
int i;
for (i=0;i<height;i++)
{
memcpy(pSurf,YuvBuf,ddsd.dwWidth*2);
YuvBuf+=ddsd.dwWidth*2;
pSurf+=ddsd.lPitch;
}
}
//如何填充YUV2的数据
m_lpDDSOverlay->Unlock(NULL);//解锁对DirectDraw表面的锁定;
PicRect.bottom=1236;
PicRect.right=1628;
PicRect.left=0;
PicRect.top=0;
/*
GetClientRect(&ScreenRect);//获得屏幕绘图区域的客户坐标;
ClientToScreen((LPPOINT)&ScreenRect.left);
ClientToScreen((LPPOINT)&ScreenRect.right);//转换客户坐标为屏幕坐标;
*/
m_lpDDSOverlay->UpdateOverlay(&PicRect,m_lpDDSPrimary,&ScreenRect,DDOVER_SHOW,NULL); //实现图像更新 DDOVER_KEYDESTOVERRIDE
return DD_OK;
};
请路过的高手指点下；
[解决办法]
你尝试不要用m_lpDDSOverlay->UpdateOverlay，当窗口大小发生改变的时候重新创建离屏表面试试吧。我觉得应该没问题。
[解决办法]
Yuv overlay 本来就是在最上一层的，无论你怎样切换页面都是这样，且一般只能有一个overlay，如果你要解决这个问题，必须采用离屏表面，呵呵！
