J'essaye d'écrire un programme simple, qui redirige toutes les fenêtres vers le backbuffer (comme le fait le gestionnaire de composite), puis écris-les en pixmap et les sauvegarde sur disque. Mais je suis arrivé cette erreur:Qt avec problème XComposite
(.text.startup+0x5e):-1: error: undefined reference to `XCompositeRedirectSubwindows'
(.text.startup+0x171):-1: error: undefined reference to `XCompositeNameWindowPixmap'
:-1: error: collect2: ld returned 1 exit status
Voici le code:
#include <QApplication>
#include <QDebug>
#include <X11/Xlib.h>
#include <QPaintDevice>
#include <QX11Info>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xrender.h>
#include <X11/extensions/Xdamage.h>
#include <QPixmap>
#include <QWidget>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
app.setGraphicsSystem("native");
Picture frontBuffer;
XRenderPictFormat *format;
Window rootWindow;
int depth;
Display *dpy = XOpenDisplay(getenv("DISPLAY"));
rootWindow = XRootWindow(dpy, XDefaultScreen(dpy));
depth = DefaultDepth(dpy, DefaultScreen(dpy));
// Redirect all the windows
XCompositeRedirectSubwindows(dpy, rootWindow, CompositeRedirectManual);
// Get the format
format = XRenderFindVisualFormat(dpy, DefaultVisual(dpy, DefaultScreen(dpy)));
XRenderPictureAttributes pa;
pa.subwindow_mode = IncludeInferiors;
// Creating front buffer
frontBuffer = XRenderCreatePicture(dpy, rootWindow, format, CPSubwindowMode, &pa);
uint nwindows;
Window root_return, parent_return, *windows;
XQueryTree(dpy, rootWindow, &root_return,
&parent_return, &windows, &nwindows);
for (uint i = 0; i < nwindows; i++) {
XWindowAttributes attr;
if (!XGetWindowAttributes(dpy, windows[i], &attr))
continue;
Pixmap pix = XCompositeNameWindowPixmap(dpy, windows[i]);
Picture pic = XRenderCreatePicture(dpy, pix, format, 0, 0);
QPixmap pixmap(540, 900);
XRenderComposite(dpy, PictOpSrc, pic, None, pixmap.x11PictureHandle(),
0, 0, 0, 0, 0 , 0, 540, 900);
pixmap.save(QString::number(i)+".png", "PNG");
}
}
XFree(windows);
return app.exec();
}