用MASK方法传送不规则位图 (转)

最新推荐文章于 2024-07-19 11:57:16 发布

转载最新推荐文章于 2024-07-19 11:57:16 发布 · 117 阅读

本文介绍了一种使用MASK方法来传送不规则位图的技术。通过定义特定的宏指令和ROP操作，该方法能够在源位图和目标位图之间进行精确的像素级融合。文章详细解释了如何创建和应用遮罩位图，以及如何结合背景和前景位图来完成最终的绘制过程。

用MASK方法传送不规则位图 (转)[@more@]#define FORE_ROP3(ROP4) (0x00FFFFFF&(ROP4))
#define BACK_ROP3(ROP4) (ROP3FromIndex(S wapROP3_SrcDst(BYTE((ROP4)>>24))))
#define DSTCOPY 0x00AA0029
#define DSTERASE 0x00220326 // dest = dest & (~src) : DSna

BOOL WIN api MyMaskBlt(HDC hdcDest, int nXDest, int nYDest, int nWidth, int nHeight,
HDC hdcSrc, int nXSrc, int nYSrc,
HBITMAP hbmMask, int xMask, int yMask,
D word dwRop
)
{
if ( hbmMask == NULL )
return BitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hdcSrc,
nXSrc, nYSrc, FORE_ROP3(dwRop));

// 1. make mask bitmap's dc
HDC hDCMask = ::CreateCompatibleDC(hdcDest);
HBITMAP hOldMaskBitmap = (HBITMAP):: select object(hDCMask, hbmMask);
ASSERT ( hOldMaskBitmap );

// 2. make masked Background bitmap

// 2.1 make bitmap
HDC hDC1 = ::CreateCompatibleDC(hdcDest);
ASSERT ( hDC1 );
HBITMAP hBitmap2 = ::CreateCompatibleBitmap(hdcDest, nWidth, nHeight);
HBITMAP hOl dbitmap2 = (HBITMAP)::SelectObject(hDC1, hBitmap2);
ASSERT ( hOldBitmap2 );

// 2.2 draw dest bitmap and mask
DWORD dwRop3 = BACK_ROP3(dwRop);
::BitBlt(hDC1, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, SRCCOPY);
::BitBlt(hDC1, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, dwRop3);
::BitBlt(hDC1, 0, 0, nWidth, nHeight, hDCMask, xMask, yMask, DSTERASE);

// 3. make masked Foreground bitmap

// 3.1 make bitmap
HDC hDC2 = ::CreateCompatibleDC(hdcDest);
ASSERT ( hDC2 );
HBITMAP hBitmap3 = ::CreateCompatibleBitmap(hdcDest, nWidth, nHeight);
HBITMAP hOldBitmap3 = (HBITMAP)::SelectObject(hDC2, hBitmap3);
ASSERT ( hOldBitmap3 );

// 3.2 draw src bitmap and mask
dwRop3 = FORE_ROP3(dwRop);
::BitBlt(hDC2, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, SRCCOPY);
::BitBlt(hDC2, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, dwRop3);
::BitBlt(hDC2, 0, 0, nWidth, nHeight, hDCMask, xMask, yMask, SRCAND);

// 4. combine two bitmap and copy it to hdcDest
::BitBlt(hDC1, 0, 0, nWidth, nHeight, hDC2, 0, 0, SRCPAINT);
::BitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hDC1, 0, 0, SRCCOPY);

// 5. restore all object
::SelectObject(hDCMask, hOldMaskBitmap);
::SelectObject(hDC1, hOldBitmap2);
::SelectObject(hDC2, hOldBitmap3);

// 6. delete all temp object
DeleteObject(hBitmap2);
DeleteObject(hBitmap3);

DeleteDC(hDC1);
DeleteDC(hDC2);
DeleteDC(hDCMask);

return TRUE;
}

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