在哪里可以找到 /usr/include/X11/extensions/Xcomposite.h

Question

我需要将我的应用程序放在全屏视频上并将其捕获以放入我的 python tkinter 应用程序中的“画中画”帧中。我已经查看了常见的嫌疑人（ImageGrab、mss 等），但它们似乎都只是抓取了监视器上可见的内容。似乎没有人能够抓住一个不可见的窗口。

我在 Stack Overflow 上发现了这个看起来很有希望的 C 程序：

• Get a screenshot of a window that is cover or not visible or minimized with Xcomposite extension for X11

#include <stdlib.h>
#include <stdio.h>

#include <X11/Xlib.h>
#include <X11/X.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xrender.h>

int
main ()
{
  Display *display = XOpenDisplay (NULL);
  XID xid = 90177543; // xdotool search --name "World of Warcraft" | head -1

  // Check if Composite extension is enabled
  int event_base_return;
  int error_base_return;
  if (XCompositeQueryExtension (display, &event_base_return, &error_base_return))
    printf ("COMPOSITE IS ENABLED!\n");

  // Requests the X server to direct the hierarchy starting at window to off-screen storage
  XCompositeRedirectWindow (display, xid, CompositeRedirectAutomatic);
  // Preventing the backing pixmap from being freed when the window is hidden/destroyed
  // If you want the window contents to still be available after the window has been destroyed,
  // or after the window has been resized (but not yet redrawn), you can increment the backing
  // pixmaps ref count to prevent it from being deallocated.
  Pixmap pixmap = XCompositeNameWindowPixmap (display, xid);

  // Get window attributes
  XWindowAttributes attr;
  Status s = XGetWindowAttributes (display, xid, &attr);
  if (s == 0)
    printf ("Fail to get window attributes!\n");

  // Extract the data
  XRenderPictFormat *format = XRenderFindVisualFormat (display, attr.visual);
  int width = attr.width;
  int height = attr.height;
  int depth = attr.depth;

  // What we need to do now is to create an XRender Picture for the window,
  // which we'll need to draw it with the Render extension.
  // A picture is a basically a handle to a server side struct with some
  // additional information about a drawable (in this case a window),
  // such as its format, which clipping region should be used when
  // drawing it (if any), whether it should be tiled etc.
  XRenderPictureAttributes pa;
  pa.subwindow_mode = IncludeInferiors;
  Picture picture = XRenderCreatePicture (display, xid, format, CPSubwindowMode, &pa);

  // We now have all the information we need in order to be able to draw the window
  // using the Xrender extension, and we've created and prepared a source picture
  // for the window for this purpose.
  // The Xrender function we'll use to draw the window is XRenderComposite().

  //XRenderComposite (display, PictOpSrc, picture, None, ???destination???, 0,0, 0,0, 0,0, width, height);

  XFreePixmap (display, pixmap);
  XCompositeUnredirectWindow (display, xid, CompositeRedirectAutomatic);

  return 0;
}

---

现在真正的问题...

我的问题是这部分：

#include <X11/Xlib.h>
#include <X11/X.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xrender.h>

所有这些文件都存在于/usr/include/X11 下，<X11/extensions/Xcomposite.h> 除外。我在哪里可以找到它？

Ubuntu 16.04 LTS (ESM)，内核 4.14.216-0414216-generic。忙着学习新东西要打破，嗯，错误，升级到新版本。

FWIW 这是一个已经在运行的音乐播放器应用程序，单击按钮可降低电视音量并恢复音乐。我只是增强它以移动到电视上，拍摄全屏视频并将其放入专辑插图通常旋转的 tkinter 框架中。计时器完成后，电视恢复播放，音乐播放器移回它来自的其他显示器。因此，我认为我找到的这个 C 程序是唯一的解决方案，但我欢迎罐装解决方案。

Answer 1

如果你search packages.ubuntu.com，你会发现它存在于libxcomposite-dev 包中，所以你需要安装它。

为了找到这个，我去了 packages.ubuntu.com，然后在“搜索包的内容”下输入“Xcomposite.h”，为“分发”选择“xenial”，以及“包含名称以结尾的文件的包”用关键字”像这样：