Xwindow父窗口中的透明窗口 [英] Transparent window in Xwindow parent

问题描述

我正在尝试在另一个正在运行的应用程序上方创建一个覆盖窗口. 假设是Firefox.我通过使用实现 Xcreatewindow

I am trying to create an overlay window above another running application. Let's say firefox. I implemented by using Xcreatewindow

win = XCreateWindow( display, *firefoxwindow,
                   50, 300, 400, 400,
                   0,
                   visualinfo.depth,
                   InputOutput,
                   visualinfo.visual,
                   CWColormap|CWEventMask|CWBackPixmap|CWBorderPixel,
                   &attr
                   ) ;

我使用XQueryTree()搜索了* firefoxwindow

I searched *firefoxwindow by using XQueryTree()

，然后遵循此代码 https://gist.github.com/903479

当我将XRoot用作父级时，结果是透明窗口. 但是，当我尝试使用firefoxwindow或其他应用程序窗口作为父窗口时，它变得毫无根据.

The result is the transparent window when I use the XRoot as parent. But, when I try to use firefoxwindow or other application window as parent, it became optique.

推荐答案

在您的情况下，您需要手动将窗口像素图与背景窗口合成.当您创建以root为父级的窗口时，通过合成窗口管理器来处理透明度

In your case you need to composite window pixmap with background window manually. When you create window with root as parent transparency is handled by compositing window manager

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