1. 根据bitmap位图生成不规则区域
// BitmapToRegion : Create a region from the "non-transparent" pixels of a bitma // Author : Jean-Edouard Lachand-Robert (http://www.geocities.com/Paris/LeftBank/1160/resume.htm), June 1998 // hBmp : Source bitma // cTransparentColor : Color base for the "transparent" pixels (default is black // cTolerance : Color tolerance for the "transparent" pixels // A pixel is assumed to be transparent if the value of each of its 3 components (blue, green and red) is // greater or equal to the corresponding value in cTransparentColor and is lower or equal to the // corresponding value in cTransparentColor + cTolerance HRGN BitmapToRegion (HBITMAP hBmp, COLORREF cTransparentColor = 0, COLORREF cTolerance = 0x101010) { HRGN hRgn = NULL; ASSERT(hBmp); if (hBmp) { // Create a memory DC inside which we will scan the bitmap conten HDC hMemDC = CreateCompatibleDC(NULL); ASSERT(hMemDC); if (hMemDC) { // Get bitmap siz BITMAP bm; GetObject(hBmp, sizeof(bm), &bm); // Create a 32 bits depth bitmap and select it into the memory DC BITMAPINFOHEADER RGB32BITSBITMAPINFO = { sizeof(BITMAPINFOHEADER), // biSize bm.bmWidth, // biWidth; bm.bmHeight, // biHeight; 1, // biPlanes; 32, // biBitCount BI_RGB, // biCompression; 0, // biSizeImage; 0, // biXPelsPerMeter; 0, // biYPelsPerMeter; 0, // biClrUsed; 0 // biClrImportant; }; VOID * pbits32; HBITMAP hbm32 = CreateDIBSection(hMemDC, (BITMAPINFO *)&RGB32BITSBITMAPINFO, DIB_RGB_COLORS, &pbits32, NULL, 0); ASSERT(hbm32); if (hbm32) { HBITMAP holdBmp = (HBITMAP)SelectObject(hMemDC, hbm32); // Create a DC just to copy the bitmap into the memory D HDC hDC = CreateCompatibleDC(hMemDC); ASSERT(hDC); if (hDC) { // Get how many bytes per row we have for the bitmap bits (rounded up to 32 bits BITMAP bm32; VERIFY(GetObject(hbm32, sizeof(bm32), &bm32)); while (bm32.bmWidthBytes % 4) bm32.bmWidthBytes++; // Copy the bitmap into the memory D HBITMAP holdBmp = (HBITMAP)SelectObject(hDC, hBmp); VERIFY(BitBlt(hMemDC, 0, 0, bm.bmWidth, bm.bmHeight, hDC, 0, 0, SRCCOPY)); // For better performances, we will use the ExtCreateRegion() function to create th // region. This function take a RGNDATA structure on entry. We will add rectangles b // amount of ALLOC_UNIT number in this structure #define ALLOC_UNIT 100 DWORD maxRects = ALLOC_UNIT; HANDLE hData = GlobalAlloc(GMEM_MOVEABLE, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects)); RGNDATA *pData = (RGNDATA *)GlobalLock(hData); pData->rdh.dwSize = sizeof(RGNDATAHEADER); pData->rdh.iType = RDH_RECTANGLES; pData->rdh.nCount = pData->rdh.nRgnSize = 0; SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0); // Keep on hand highest and lowest values for the "transparent" pixel BYTE lr = GetRValue(cTransparentColor); BYTE lg = GetGValue(cTransparentColor); BYTE lb = GetBValue(cTransparentColor); BYTE hr = min(0xff, lr + GetRValue(cTolerance)); BYTE hg = min(0xff, lg + GetGValue(cTolerance)); BYTE hb = min(0xff, lb + GetBValue(cTolerance)); // Scan each bitmap row from bottom to top (the bitmap is inverted vertically BYTE *p32 = (BYTE *)bm32.bmBits + (bm32.bmHeight - 1) * bm32.bmWidthBytes; for (int y = 0; y < bm.bmHeight; y++) { // Scan each bitmap pixel from left to righ for (int x = 0; x < bm.bmWidth; x++) { // Search for a continuous range of "non transparent pixels" int x0 = x; LONG *p = (LONG *)p32 + x; while (x < bm.bmWidth) { BYTE b = GetRValue(*p); if (b >= lr && b <= hr) { b = GetGValue(*p); if (b >= lg && b <= hg) { b = GetBValue(*p); if (b >= lb && b <= hb) // This pixel is "transparent" break; } } p++; x++; } if (x > x0) { // Add the pixels (x0, y) to (x, y+1) as a new rectangle in the regio if (pData->rdh.nCount >= maxRects) { GlobalUnlock(hData); maxRects += ALLOC_UNIT; VERIFY(hData = GlobalReAlloc(hData, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), GMEM_MOVEABLE)); pData = (RGNDATA *)GlobalLock(hData); ASSERT(pData); } RECT *pr = (RECT *)&pData->Buffer; SetRect(&pr[pData->rdh.nCount], x0, y, x, y+1); if (x0 < pData->rdh.rcBound.left) pData->rdh.rcBound.left = x0; if (y < pData->rdh.rcBound.top) pData->rdh.rcBound.top = y; if (x > pData->rdh.rcBound.right) pData->rdh.rcBound.right = x; if (y+1 > pData->rdh.rcBound.bottom) pData->rdh.rcBound.bottom = y+1; pData->rdh.nCount++; // On Windows98, ExtCreateRegion() may fail if the number of rectangles is to // large (ie: > 4000). Therefore, we have to create the region by multiple steps if (pData->rdh.nCount == 2000) { HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData); ASSERT(h); if (hRgn) { CombineRgn(hRgn, hRgn, h, RGN_OR); DeleteObject(h); } else hRgn = h; pData->rdh.nCount = 0; SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0); } } } // Go to next row (remember, the bitmap is inverted vertically p32 -= bm32.bmWidthBytes; } // Create or extend the region with the remaining rectangle HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData); ASSERT(h); if (hRgn) { CombineRgn(hRgn, hRgn, h, RGN_OR); DeleteObject(h); } else hRgn = h; // Clean u SelectObject(hDC, holdBmp); DeleteDC(hDC); } DeleteObject(SelectObject(hMemDC, holdBmp)); } DeleteDC(hMemDC); } } return hRgn; }
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