VC++ BMP 到 RGN区域图的转换方法

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  • 2022-06-15 10:54
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摘要:VC/C++源码,图形处理,GDI 运行环境:Windows/Visual C/C++
A033839411-25277.rar
  • okbase.net
  • bmp_to_rgn
  • winnt256.bmp
    153.4KB
  • win32.dsw
    516B
  • main.cpp
    8.1KB
  • win32.aps
    183.2KB
  • win32.dsp
    3.6KB
  • resource.h
    454B
  • win32.001
    3.7KB
  • win32.rc
    1.6KB
内容介绍
// Windows Header Files: #include <windows.h> #include "resource.h" TCHAR szClassName[] = "WIN32TEST"; HBITMAP hBmp; LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; switch (message) { case WM_NCHITTEST: return HTCAPTION; case WM_LBUTTONDOWN: break; case WM_PAINT: hdc = BeginPaint (hWnd, &ps); if (hBmp) { BITMAP bm; GetObject(hBmp, sizeof(bm), &bm); HDC memdc = CreateCompatibleDC(NULL); HBITMAP h = (HBITMAP)SelectObject(memdc, hBmp); BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, memdc, 0, 0, SRCCOPY); SelectObject(memdc, h); } EndPaint (hWnd, &ps); break; case WM_KEYDOWN: if (wParam != VK_ESCAPE) break; // Fall thru case WM_DESTROY: PostQuitMessage(0); break; default: return (DefWindowProc(hWnd, message, wParam, lParam)); } return (0); } // // BitmapToRegion : Create a region from the "non-transparent" pixels of a bitmap // Author : Jean-Edouard Lachand-Robert (http://www.geocities.com/Paris/LeftBank/1160/resume.htm), June 1998. // // hBmp : Source bitmap // 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; if (hBmp) { // Create a memory DC inside which we will scan the bitmap content HDC hMemDC = CreateCompatibleDC(NULL); if (hMemDC) { // Get bitmap size 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); if (hbm32) { HBITMAP holdBmp = (HBITMAP)SelectObject(hMemDC, hbm32); // Create a DC just to copy the bitmap into the memory DC HDC hDC = CreateCompatibleDC(hMemDC); if (hDC) { // Get how many bytes per row we have for the bitmap bits (rounded up to 32 bits) BITMAP bm32; GetObject(hbm32, sizeof(bm32), &bm32); while (bm32.bmWidthBytes % 4) bm32.bmWidthBytes++; // Copy the bitmap into the memory DC HBITMAP holdBmp = (HBITMAP)SelectObject(hDC, hBmp); BitBlt(hMemDC, 0, 0, bm.bmWidth, bm.bmHeight, hDC, 0, 0, SRCCOPY); // For better performances, we will use the ExtCreateRegion() function to create the // region. This function take a RGNDATA structure on entry. We will add rectangles by // 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" pixels 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 right 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 region if (pData->rdh.nCount >= maxRects) { GlobalUnlock(hData); maxRects += ALLOC_UNIT; hData = GlobalReAlloc(hData, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), GMEM_MOVEABLE); pData = (RGNDATA *)GlobalLock(hData); } 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 too // 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); 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 rectangles HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData); if (hRgn) { CombineRgn(hRgn, hRgn, h, RGN_OR); DeleteObject(h); } else hRgn = h; // Clean up SelectObject(hDC, holdBmp); DeleteDC(hDC); } DeleteObject(SelectObject(hMemDC, holdBmp)); } DeleteDC(hMemDC); } } return hRgn; } int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { WNDCLASS wc; HWND hWnd; MSG msg; hBmp = (HBITMAP)LoadImage(hInstance, MAKEINTRESOURCE(IDB_BITMAP1), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION); if (hBmp) { ZeroMemory(&wc, sizeof(wc)); wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpszClassName = szClassName; wc.lpfnWndProc = (WNDPROC)WndProc; wc.hInstance = hInstance; if (RegisterClass(&wc)) { BITMAP bm; GetObject(hBmp, sizeof(bm), &bm); hWnd = CreateWindow(szClassName, NULL, WS_POPUP, 0, 0, bm.bmWidth, bm.bmHeight, NULL, NULL, hInstance, NULL); if (hWnd) { HRGN h = BitmapToRegion(hBmp); if (h) SetWindowRgn(hW
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