本文所述为一个由CISBitmap派生的VC++位图透明类，可以方便实现BMP图像的透明处理，主要包含两个文件，使用时主需要将其引入到你的C++工程中即可，具体的类代码如下：
CISBitmap.cpp文件代码如下：
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#include <stdafx.h>#include "CISBitmap.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endifCCISBitmap::CCISBitmap(){ m_crBlack = 0; m_crWhite = RGB(255,255,255);}CCISBitmap::~CCISBitmap(){}int CCISBitmap::Width(){ BITMAP bm; GetBitmap(&bm); return bm.bmWidth;}int CCISBitmap::Height(){ BITMAP bm; GetBitmap(&bm); return bm.bmHeight;}void CCISBitmap::DrawTransparent(CDC * pDC, int x, int y, COLORREF crColour){ COLORREF crOldBack = pDC->SetBkColor(m_crWhite); COLORREF crOldText = pDC->SetTextColor(m_crBlack); CDC dcImage, dcTrans; dcImage.CreateCompatibleDC(pDC); dcTrans.CreateCompatibleDC(pDC); CBitmap* pOldBitmapImage = dcImage.SelectObject(this); CBitmap bitmapTrans; int nWidth = Width(); int nHeight = Height(); bitmapTrans.CreateBitmap(nWidth, nHeight, 1, 1, NULL); CBitmap* pOldBitmapTrans = dcTrans.SelectObject(&bitmapTrans); dcImage.SetBkColor(crColour); dcTrans.BitBlt(0, 0, nWidth, nHeight, &dcImage, 0, 0, SRCCOPY); pDC->BitBlt(x, y, nWidth, nHeight, &dcImage, 0, 0, SRCINVERT); pDC->BitBlt(x, y, nWidth, nHeight, &dcTrans, 0, 0, SRCAND); pDC->BitBlt(x, y, nWidth, nHeight, &dcImage, 0, 0, SRCINVERT); dcImage.SelectObject(pOldBitmapImage); dcTrans.SelectObject(pOldBitmapTrans); pDC->SetBkColor(crOldBack); pDC->SetTextColor(crOldText);} |
CISBitmap.h文件代码如下：
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//请保存为文件名：CISBitmap.h#if !defined(AFX_CISBITMAP_H__08BA6EB3_DB4C_11D1_8A89_0040052E2D91__INCLUDED_)#define AFX_CISBITMAP_H__08BA6EB3_DB4C_11D1_8A89_0040052E2D91__INCLUDED_#if _MSC_VER >= 1000#pragma once#endif // _MSC_VER >= 1000class CCISBitmap : public CBitmap {public: CCISBitmap(); virtual ~CCISBitmap(); int Height(); int Width(); virtual void DrawTransparent(CDC* pDC, int x, int y, COLORREF crColour); private: COLORREF m_crBlack; COLORREF m_crWhite;};#endif // !defined(AFX_CISBITMAP_H__08BA6EB3_DB4C_11D1_8A89_0040052E2D91__INCLUDED_) |
感兴趣的朋友可以将本文所述代码放到自己的VC++工程文件中测试一下运行效果，相信会对大家的VC++项目开发起到一定的帮助作用。
