如何做成任意透明度的窗体！用VB或VC!

2000-03-20 10:55:00 417 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Unity集成Dlib人脸特征点检测：跨平台高性能实现方案人脸特征点检测是计算机视觉中的基础技术，其核心原理是通过机器学习模型定位人脸关键部位（如眼、鼻、嘴）的坐标。这项技术通过提取面部几何信息，为上层应用提供结构化数据，具有重要的技术价值。在虚拟主播、AR滤镜、表情驱动等实时交互场景中，高精度、低延迟的特征点检测是体验流畅的关键。本文聚焦于将经典的Dlib库及其68点模型深度集成到Unity引擎，通过P/Invoke桥接、多平台原生库编译、以及纹理数据高效传递等工程实践，解决C++与C#环境兼容、移动端性能优化等核心难题，为开发高精度面部应用提供了一套稳定、可控阅读详情

...全文

Allegro模块复用：从原理图到PCB的完整流程与关键细节本文详细介绍了Allegro模块复用从原理图到PCB的完整流程与关键细节，包括DSN和MDD文件的创建、模块调用的实战技巧以及双向同步与版本控制方法。通过标准化处理和高级复用技巧，能显著提升PCB设计效率，减少重复工作时间。适用于智能硬件和工业控制等领域的工程师。阅读详情

town

Windows Server 6,873 成员 177,926 内容

+ 关注 + 加入社区

切换为时间正序

zork 2000-04-04

打赏
举报

找到啦！

//
// BitmapToRegion : Create a region from the "non-transparent" pixels of a bitmap
//
// 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;

ASSERT(hBmp);
if (hBmp)
{
// Create a memory DC inside which we will scan the bitmap content
HDC hMemDC = CreateCompatibleDC(NULL);
ASSERT(hMemDC);
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);
ASSERT(hbm32);
if (hbm32)
{
HBITMAP holdBmp = (HBITMAP)SelectObject(hMemDC, hbm32);

// Create a DC just to copy the bitmap into the memory DC
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 DC
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 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;
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 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);
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 rectangles
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 up
SelectObject(hDC, holdBmp);
DeleteDC(hDC);
}

DeleteObject(SelectObject(hMemDC, holdBmp));
}

DeleteDC(hMemDC);
}
}

return hRgn;
}

kxy 2000-04-02

打赏
举报

我见过一个delphi写的source,使用"欺骗"的方法.
FormCreate之前,把背景copy下来,然后把这个图作处理,画到Form上.
Form移动的时候,Hide,Copy处理,Form.Show.
效果还可以.

Lin 2000-04-02

打赏
举报

也告诉我...

zork 2000-04-02

打赏
举报

基本用一张位图的某一个颜色范围作为Alpha通道，即可实现，
如果需要函数源码请联系！

thriller 2000-04-02

打赏
举报

需要实现这种效果的控件？
Tyche 控件组。
任意形状、透明度（实际上需要实时图象处理）。
即将完成。

kxy 2000-03-21

打赏
举报

SetwindowRgn

zjy 2000-03-21

打赏
举报

关注

Grace 2000-03-21

打赏
举报

SetwindowRgn只能设置镂空的窗体,这样的窗体属于透明度100%的窗体,在Win9x系统下做任意透明度,比如半透明在是一件非常困难的事,做成了效果也不好,因为Win9x并未提供如此接口,如果那位网友知道Windows 2000提供的如此接口,请帮忙告知,谢谢!

如何做成任意透明度的窗体！用VB或VC!

相关推荐