图像与文字的合成
2010-07-25 20:46:59 来源:WEB开发网二、关键程序段
CreateMemObject(CDC *pDC, BITMAPINFO *lpbmi, int* pnLineChar)
{
if (NULL == m_pMemDC)
{
m_pMemDC = new CDC();
m_pMemDC->CreateCompatibleDC(pDC);
}
if (m_pMemBmp != NULL)
{
m_pMemDC->SelectObject(m_pOldBmp);
delete m_pMemBmp;
m_pMemBmp = NULL;
}
m_pMemBmp = new CBitmap(); //根据图片的大小创建一个兼容位图
m_pMemBmp->CreateCompatibleBitmap(pDC, m_lpBMPHdr->biWidth, m_lpBMPHdr->biHeight);
m_pOldBmp = m_pMemDC->SelectObject(m_pMemBmp);
m_pMemDC->FillSolidRect(0, 0, m_lpBMPHdr->biWidth, m_lpBMPHdr->biHeight, RGB(255, 255, 255));
//把图像的数据绘制到兼容位图上
SetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject,
0, m_lpBMPHdr->biHeight, (LPVOID)m_lpDIBits, (BITMAPINFO*)m_lpBMPHdr, DIB_RGB_COLORS);
}
SetBmpText(const CString &strText, BOOL bRepaint)
{
//本函数在位图上添加文本
m_strBmpText = strText;
SetDIBits(m_pMemDC->GetSafeHdc(), (HBITMAP)m_pMemBmp->m_hObject,
0, m_lpBMPHdr->biHeight, (LPVOID)m_lpDIBits, (BITMAPINFO*)m_lpBMPHdr, DIB_RGB_COLORS);
if (m_strBmpText.GetLength() > 0)
{
//制造透明和重影效果
m_pMemDC->SetBkMode(TRANSPARENT);
m_pMemDC->SetTextColor(RGB(0, 0, 0));
m_pMemDC->TextOut(10, 10, m_strBmpText);
m_pMemDC->SetTextColor(RGB(255, 255, 255));
m_pMemDC->TextOut(11, 11, m_strBmpText);
}
if (bRepaint)
{
Invalidate();
}
}
SetSaveBmpPath(LPCTSTR pszPath)
{
//从兼容位图中取出合成的数据
BYTE *pTemp = new BYTE[m_dwImageSize];
ZeroMemory(pTemp, m_dwImageSize);
int nCount = GetDIBits(m_pMemDC->GetSafeHdc(),
(HBITMAP)m_pMemBmp->m_hObject, 0, m_lpBMPHdr->biHeight,
(LPVOID)pTemp, (BITMAPINFO*)m_lpBMPHdr, DIB_RGB_COLORS);
}
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