2024年2月21日发(作者:)
){
if (nWidthDest < 1) return false; if (nWidthSrc < 1) return false; if (nHeightDest < 1) return false; if (nHeightSrc < 1) return false; HDC dc = CreateCompatibleDC(NULL); HBITMAP bitmap = CreateBitmap(nWidthSrc, nHeightSrc, 1, GetDeviceCaps(dc, BITSPIXEL), NULL); if (bitmap == NULL) { DeleteDC(dc);
return false; }
HBITMAP oldBitmap = (HBITMAP)SelectObject(dc, bitmap); if (!BitBlt(dc, 0, 0, nWidthSrc, nHeightSrc, dcSrc, nXOriginSrc, nYOriginSrc, SRCCOPY)) { SelectObject(dc, oldBitmap); DeleteObject(bitmap);
DeleteDC(dc);
return false; }
HDC maskDC = CreateCompatibleDC(NULL); HBITMAP maskBitmap = CreateBitmap(nWidthSrc, nHeightSrc, 1, 1, NULL);if (maskBitmap == NULL) { SelectObject(dc, oldBitmap); DeleteObject(bitmap);
DeleteDC(dc);
DeleteDC(maskDC);
return false; } HBITMAP oldMask = (HBITMAP)SelectObject(maskDC, maskBitmap); SetBkColor(maskDC, RGB(0,0,0)); SetTextColor(maskDC, RGB(255,255,255)); if (!BitBlt(maskDC, 0,0,nWidthSrc,nHeightSrc,NULL,0,0,BLACKNESS)) { SelectObject(maskDC, oldMask); DeleteObject(maskBitmap);
DeleteDC(maskDC);
SelectObject(dc, oldBitmap);
DeleteObject(bitmap);
DeleteDC(dc);
return false; } SetBkColor(dc, crTransparent); BitBlt(maskDC, 0,0,nWidthSrc,nHeightSrc,dc,0,0,SRCINVERT); SetBkColor(dc, RGB(0,0,0)); SetTextColor(dc, RGB(255,255,255)); BitBlt(dc, 0,0,nWidthSrc,nHeightSrc,maskDC,0,0,SRCAND); HDC newMaskDC = CreateCompatibleDC(NULL); HBITMAP newMask; newMask = CreateBitmap(nWidthDest, nHeightDest, 1, GetDeviceCaps(newMaskDC, BITSPIXEL), NULL); if (newMask == NULL) { SelectObject(dc, oldBitmap); DeleteDC(dc); SelectObject(maskDC, oldMask); DeleteDC(maskDC); DeleteDC(newMaskDC); DeleteObject(bitmap);
DeleteObject(maskBitmap); return false; } SetStretchBltMode(newMaskDC, COLORONCOLOR); HBITMAP oldNewMask = (HBITMAP) SelectObject(newMaskDC, newMask); StretchBlt(newMaskDC, 0, 0, nWidthDest, nHeightDest, maskDC, 0, 0, nWidthSrc, nHeightSrc, SRCCOPY); SelectObject(maskDC, oldMask); DeleteDC(maskDC); DeleteObject(maskBitmap); HDC newImageDC = CreateCompatibleDC(NULL); HBITMAP newImage = CreateBitmap(nWidthDest, nHeightDest, 1, GetDeviceCaps(newMaskDC, BITSPIXEL), NULL); if (newImage == NULL) { SelectObject(dc, oldBitmap); DeleteDC(dc); DeleteDC(newMaskDC);
发布评论