如何在98下做异形窗体和半透明窗体？

Win98下面不能使用SetLayeredWindowAttributes()，只能自己做，有一种做法大致是这样的：获取当前窗体后面的背景的图片内容，然后以SRCAND方式贴到当前窗体上

CRgn m_rgnWnd;// 创建RoundRect区域m_rgnWnd
m_rgnWnd.CreateRoundRectRgn(0, 0, 300, 300, 30, 30);
// 将m_rgnWnd设置为窗口区域
SetWindowRgn((HRGN)m_rgnWnd, TRUE);

我要的是去掉位图背景的区域在转成RGN要怎么做呢？楼上几位的回答未免也太易了。

早就想写一篇我这方面的心得, 一直特忙没有空, 不过这次点名找我, 就
不好再缩头缩脑了.
其实我也还有很多问题没有解决, 在这里也向高手请教.
此篇在V-Galaxy BBS发表, 如要转贴请和作者联系
[email protected]
1. Windows 2000 的GDI+扩充集
Windows 2000内部扩充了原有的GDI指令集, 将直接提供高效的图像处理指
令如Alpha Blending等. 在Win2000里有一个专门
的窗口风格WS_EX_LAYERED提供透明窗口的可能. Win2000还提供如
AnimateWindow(...)一类的API, 直接支持窗口动画.
有关连接
http://www.microsoft.com/hwdev/video/GDInext.htm
http://x.wonder.ca/stevex/nthack/
2. Win95/NT下的实现方法
既然Windows不提供现成的, 就只好自己做了. 原则上是这么过程:
a. 获取桌面的DC, 生成一个兼容的Bitmap, 送一个WM_PAINT消息, 把桌面
取到Bitmap里. (就像一个Screen Capture)
b. 把自己要开的窗口画到另一幅Bitmap
c. 用这两幅图片做Alpha Blending, 或者其他效果, 生成第三幅图.
d. 最后再把图片BitBlt出来
说起来并不难, 但技术上有几个问题.
1. 如何把hidden的窗口拷贝到图像里?
原则上说, 是做不到的. 但在自己程序里可以做一些手脚. 我在
SafeClean Utilities2里用的Wizard窗口, 就需要在显示之前
获取图像, 再做处理. 我用的是WM_PRINT消息, 平时用的很少, 但可以把
Z-Order低的窗口也拦截下来(hidden的还不行). 比如
我要从第1页(p1)翻到第二页(p2), 我就得在显示新窗口之前, 把p1移到最
上面, 再显示p2(被p1遮挡着), 向p2送WM_PRINT消息
拦截图片, 再做动画, 关闭p1.
2. WM_PRINT的问题
WM_PRINT其实和WM_PAINT差不多, 但可以拦截被其他窗口遮住的部分. 但
不是所有窗口都支持WM_PRINT, 比如Static control,
只能自己在Bitmap里把他们画上.
3. 如何把程序下面的窗口储存在Bitmap里?
要想实现真正的象Win2000的Transparent Window, 就必须得把自己程序下
面的窗口存在图片里. 能否实现我也不清楚.
我用的技术其实只适合做Splash Window和象金山词霸那样静态的透明窗
口.我用的代码列在下面, 因为涉及到一些其他类, 分布在不同地方, 所以并
不完整. 仅供参考. 关于使用Alpha Blending, 可以参看
www.codeguru.com的Bitmap部分, 有很好的代码. 这段时间实在很忙, 学
校又要开始考试, 只是粗略介绍, 请大家谅解.int CFadeWindow::FadeAndSwitchWindow(CWnd* pWndFrom, CWnd*
pWndTo)
{
CWnd* pDesktop = CWnd::GetDesktopWindow();
CWnd* pMain = AfxGetMainWnd();
CClientDC dc(pMain);
CRect rc;
pWndFrom->GetWindowRect(rc);
pMain->ScreenToClient(rc);
CDC *pDCFrom;
pDCFrom=pWndFrom->GetDC ();
m_dib1.PasteDC ( pDCFrom, 0, 0, rc.Width(), rc.Height());
m_dib3.PasteDC ( pDCFrom, 0, 0, rc.Width(), rc.Height());
pWndFrom->ReleaseDC ( pDCFrom );
CClientDC dcWndTo(pWndTo);
CDC dcTo;
dcTo.CreateCompatibleDC(&dcWndTo);
CBitmap bmpTo;
bmpTo.CreateCompatibleBitmap(&dcWndTo, rc.Width(), rc.Height());
CBitmap * pOldbmp = dcTo.SelectObject(&bmpTo);
SetWindowPos(pWndFrom->GetSafeHwnd(), HWND_TOP,
0,0,0,0,SWP_NOSIZE|SWP_NOMOVE);
pWndTo->ShowWindow(SW_SHOW);
pWndTo->SendMessage(WM_PRINT, (WPARAM) dcTo.GetSafeHdc(),
(LPARAM) PRF_CLIENT|PRF_CHILDREN|PRF_OWNED);
m_dib2.PasteDC ( &dcTo, 0, 0, rc.Width(), rc.Height());
dcTo.SelectObject(pOldbmp);
SetWindowPos(pWndTo->GetSafeHwnd(), HWND_TOP,
0,0,0,0,SWP_NOSIZE|SWP_NOMOVE|SWP_NOREDRAW|SWP_SHOWWINDOW);
SetWindowPos(pWndFrom->GetSafeHwnd(), NULL,
0,0,0,0,SWP_NOSIZE|SWP_NOMOVE|SWP_NOREDRAW|SWP_NOZORDER|SWP_HIDEW
INDOW);
int index = 5;
for (int i=0; i {
m_dib3.Paste(&m_dib1);
m_dib3.Blend(&m_dib2, i*256/index);
m_draw.DrawDib ( &m_dib3, dc.GetSafeHdc(), rc.left, rc.top,
rc.Width(), rc.Height(), DDF_HALFTONE );
Sleep(10);
}
m_draw.DrawDib ( &m_dib2, dc.GetSafeHdc(), rc.left, rc.top,
rc.Width(), rc.Height(), DDF_HALFTONE );
return 1;
}（摘自《程序员大本营》）

HRGN GetBmpRgn(HBITMAP hBitmap)
{
    int  x1,x2;
    int  nBit;
    HRGN hRgn0;
    HRGN hRgn1;
    HRGN hRgn2;
    BYTE *Data;
    BITMAP Bmp;    if (GetObject(hBitmap,sizeof(
        Bmp),&Bmp)==0)
        return NULL;
    if (Bmp.bmBitsPixel != 1) {
        return NULL; //不是单色的位图
    }    hRgn0 = NULL;
    for(int h=0; h<Bmp.bmHeight; h++) {
        Data = (BYTE*)Bmp.bmBits+(Bmp.bmHeight
            -1-h)*Bmp.bmWidthBytes;
        for(nBit=7,x1=0; x1<Bmp.bmWidth; ) {
            //首先查找白点
            for(; x1<Bmp.bmWidth; x1++,nBit--) {
                if (nBit < 0) {
                    nBit = 7;  Data++;
                }
                if ((*Data>>nBit) & 1)
                    break; //找到白点
            }
            //然后查找黑点
            for(x2=x1+1,nBit--; x2<Bmp.bmWidth;
                x2++,nBit--) {
                if (nBit < 0) {
                    nBit = 7;  Data++;
                }
                if (((*Data>>nBit)&1)==0)
                    break; //找到黑点
            }
            if (x1 < Bmp.bmWidth) {
                hRgn1 = CreateRectRgn(x1, h,
                    x2, h+1);
                if (hRgn0 == NULL)
                    hRgn0 = hRgn1;
                else {
                    CombineRgn(hRgn0, hRgn0,
                        hRgn1, RGN_OR);
                    DeleteObject(hRgn1);
                }
                x1 = x2+1;  nBit--;
            }
        }
    }
    return hRgn0;
}

针对各种颜色的HBITMAP转化为region。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
GlobalFree(hData);
SelectObject(hDC, holdBmp);
DeleteDC(hDC);
} DeleteObject(SelectObject(hMemDC, holdBmp));
} DeleteDC(hMemDC);
}
} return hRgn;
}

用photoshop转化成2色位图很快就出来了

半透明的混色方法？？？？？
kkkkkkkk

调试易

如何在98下做异形窗体和半透明窗体？

解决方案 »