GetDIBits 遍历位图 获取像素的颜色值(RGB)

GetDIBits 遍历位图 获取像素的颜色值(RGB)




CBitmap m_bmp;
//根据位图资源导入之后的ID来获得位图
m_bmp.LoadBitmap(IDB_BITMAP_ORIGIN);</pre>

 1     BITMAP bm;
 2     m_bmp.GetBitmap(&bm);
 3 
 4     int nbyte = bm.bmBitsPixel / 8;
 5 
 6     BITMAPINFO bi;  
 7     bi.bmiHeader.biSize = sizeof(bi.bmiHeader);  
 8     bi.bmiHeader.biWidth = bm.bmWidth;  
 9     bi.bmiHeader.biHeight = -bm.bmHeight;  
10     bi.bmiHeader.biPlanes = 1;  
11     bi.bmiHeader.biBitCount = bm.bmBitsPixel;   
12     bi.bmiHeader.biCompression = BI_RGB;   
13     bi.bmiHeader.biSizeImage = bm.bmWidth * bm.bmHeight * nbyte; 
14     bi.bmiHeader.biClrUsed = 0;  
15     bi.bmiHeader.biClrImportant = 0;  
16 
17     // 获取位图数据  
18     HDC hdc = ::GetDC(NULL);  
19     BYTE* pBits = (BYTE*)new BYTE[bm.bmWidth * bm.bmHeight * nbyte];  
20     ::ZeroMemory(pBits, bm.bmWidth * bm.bmHeight * nbyte);  
21     if (!::GetDIBits(hdc, m_bmp, 0, bm.bmHeight, pBits, &bi, DIB_RGB_COLORS))  
22     {  
23         delete pBits;  
24         pBits = NULL;  
25     } 
26     for (int i = 0;i < bm.bmWidth;++i)
27     {
28         for (int j = 0;j < bm.bmHeight;++j)
29         {
30             BYTE r = pBits[i * nbyte + j * bm.bmWidthBytes + 2];
31             BYTE g = pBits[i * nbyte + j * bm.bmWidthBytes + 1];
32             BYTE b = pBits[i * nbyte + j * bm.bmWidthBytes+ 0];
33             //这里就可以做我们处理了
34         }
35     }
36 
37     delete pBits;  
38     pBits = NULL; 
View Code

 


接下来就是通过GetDIBits函数来对位图的像素进行遍历,获取RGB

posted @ 2013-10-29 10:47  陳さん様  阅读(647)  评论(0编辑  收藏  举报