DirectX--yuv420p上实现的字符叠加

 1 unsigned char *pTemp;    
 2 BYTE OsdY = 0;
 3 BYTE OsdU = 0;
 4 BYTE OsdV = 0;
 5 
 6 void OSDSetTextColor(BYTE OsdR, BYTE OsdG, BYTE OsdB)
 7 {
 8     OsdY = 0.25*OsdR+0.504*OsdG+0.098*OsdB+16;
 9     OsdU = -0.148*OsdR-0.291*OsdG+0.439*OsdB+128;
10     OsdV = 0.439*OsdR-0.368*OsdG-0.071*OsdB+128;
11 }
12 
13 void CTest0Dlg::setOSD()
14 {
15     FILE *fp=fopen("d:\temp\OSD.bmp", "rb");
16     if (fp == 0)
17         return;
18 
19     HDC hDC = ::GetDC(GetSafeHwnd());
20     HDC hMemDC = CreateCompatibleDC(hDC);
21     fseek(fp, sizeof(BITMAPFILEHEADER), 0);
22     BITMAPINFOHEADER head;
23     fread(&head, sizeof(BITMAPINFOHEADER), 1, fp);
24     int bmpHeight = head.biHeight;
25     int bmpWidth = head.biWidth;
26     int biBitCount = head.biBitCount;
27     int lineByte = (bmpWidth*biBitCount/8+3)/4*4;
28     RGBQUAD *pColorTable;
29     unsigned char *pBmpBuf = new unsigned char[lineByte*bmpHeight];
30     fread(pBmpBuf, 1, lineByte*bmpHeight, fp);
31     memset(pBmpBuf,0, lineByte*bmpHeight);
32     
33     CDC *m_pMemDC;
34     m_pMemDC = new CDC();
35     CDC *pDC;
36     pDC = GetDC();
37     m_pMemDC->CreateCompatibleDC(pDC);
38     CBitmap *m_pOldBmp = NULL;
39     CBitmap *m_pMemBmp = new CBitmap();//根据图片的大小创建一个兼容位图
40     m_pMemBmp->CreateCompatibleBitmap(pDC, bmpWidth, bmpHeight);
41     m_pOldBmp = m_pMemDC->SelectObject(m_pMemBmp);
42     
43     // 把图像的数据绘制到兼容位图上
44     SetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject, 0, bmpHeight, (LPVOID)pBmpBuf, (BITMAPINFO*)&head, DIB_RGB_COLORS);
45     m_pMemDC->SetBkMode(TRANSPARENT);
46     m_pMemDC->SetTextColor(RGB(255, 0, 0));//RGB标记色
47     OSDSetTextColor(0, 0, 0);//OSD显示色
48     
49     //设置字体
50     CFont font;
51     font.CreateFont(20,15,0,0,10,FALSE,FALSE,FALSE,ANSI_CHARSET,OUT_DEFAULT_PRECIS,OUT_DEFAULT_PRECIS,DEFAULT_QUALITY,FF_SWISS,"宋体");
52     SelectObject(hMemDC, font); 
53     ///////////////////////////
54     SYSTEMTIME st;
55     CString strDate,strTime;
56     GetLocalTime(&st);
57     strDate.Format("时间 %04d-%02d-%02d ",st.wYear,st.wMonth,st.wDay);
58     strTime.Format("%02d:%02d:%02d",st.wHour,st.wMinute,st.wSecond);
59     // 添加文字到指定位置
60     m_pMemDC->TextOut(20, 40, strDate+strTime);
61     
62     pTemp = new unsigned char[lineByte*bmpHeight];
63     GetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject, 0, bmpHeight, (LPVOID)pTemp, (BITMAPINFO*)&head, DIB_RGB_COLORS);
64     fclose(fp);
65 
66     delete m_pMemBmp;
67     delete m_pMemDC;
68     delete[] pBmpBuf;
69 
70 
71     //MessageBox("VOER!");
72 }
73 
74 调用部分
75 //////////////////////////////////////////////////////////////////////////////////////
76     setOSD();
77     for (int i=0;i<80;i++)
78     {
79         for (int k=0;k<640;k++)
80         {
81             //dc.SetPixel(k,79-i,RGB(pTemp[(i*640+k)*3+2],pTemp[(i*640+k)*3+1],pTemp[(i*640+k)*3+0]));
82             if (pTemp[(i*640+k)*3+2]!=0)//需要叠加  通过标记色过滤
83             {
84                 pFrameYUV->data[0][(79-i)*720+k]=OsdY;
85                 if ((79-i)%2==0)
86                 {
87                     pFrameYUV->data[1][(79-i)*720/4+k/2]=OsdU;
88                     pFrameYUV->data[2][(79-i)*720/4+k/2]=OsdV;
89                 }            
90             }
91         }
92     }
93 /////////////////////////////////////////////////////////////////////////////////////////
94 
95     //拷贝数据yuv420，也可预先改变指针
96     memcpy(image->pixels[0],    pFrameYUV->data[0],720*576);
97     memcpy(image->pixels[2],    pFrameYUV->data[1],720*576/4);
98     memcpy(image->pixels[1],    pFrameYUV->data[2],720*576/4);
http://blog.csdn.net/mao0514/article/details/41979245