1.1 --- a/src/cwin.cc	Fri Jan 29 10:23:08 2016 +0200
     1.2 +++ b/src/cwin.cc	Sat Jan 30 07:48:51 2016 +0200
     1.3 @@ -1,9 +1,13 @@
     1.4  #include <string.h>
     1.5  #include <vector>
     1.6  #include <algorithm>
     1.7 +#include <X11/Xlib.h>
     1.8 +#include <X11/extensions/Xdamage.h>
     1.9  #include "cwin.h"
    1.10  #include "logger.h"
    1.11  
    1.12 +extern Display *dpy;
    1.13 +
    1.14  static std::vector<CompWindow*> cwinlist;
    1.15  
    1.16  CompWindow::CompWindow(Window xid)
    1.17 @@ -12,6 +16,17 @@
    1.18  	xpixmap = 0;
    1.19  	memset(&attr, 0, sizeof attr);
    1.20  	mapped = false;
    1.21 +	damage = 0;
    1.22 +}
    1.23 +
    1.24 +CompWindow::~CompWindow()
    1.25 +{
    1.26 +	if(xpixmap) {
    1.27 +		XFreePixmap(dpy, xpixmap);
    1.28 +	}
    1.29 +	if(damage) {
    1.30 +		XDamageDestroy(dpy, damage);
    1.31 +	}
    1.32  }
    1.33  
    1.34  void add_window(CompWindow *cwin)
    1.35 @@ -21,6 +36,11 @@
    1.36  		return;
    1.37  	}
    1.38  
    1.39 +	// create the damage structure to track dirty regions in this window
    1.40 +	if(!cwin->damage) {
    1.41 +		cwin->damage = XDamageCreate(dpy, cwin->xwin, XDamageReportNonEmpty);
    1.42 +	}
    1.43 +
    1.44  	cwinlist.push_back(cwin);
    1.45  }
    1.46  

     2.1 --- a/src/cwin.h	Fri Jan 29 10:23:08 2016 +0200
     2.2 +++ b/src/cwin.h	Sat Jan 30 07:48:51 2016 +0200
     2.3 @@ -2,6 +2,7 @@
     2.4  #define COMP_WIN_H_
     2.5  
     2.6  #include <X11/Xlib.h>
     2.7 +#include <X11/extensions/Xdamage.h>
     2.8  #include "texture.h"
     2.9  
    2.10  class CompWindow {
    2.11 @@ -12,9 +13,13 @@
    2.12  	XWindowAttributes attr;
    2.13  	bool mapped;
    2.14  
    2.15 +	Damage damage;
    2.16 +	XRectangle damage_rect;
    2.17 +
    2.18  	Texture tex;
    2.19  
    2.20  	CompWindow(Window xid = 0);
    2.21 +	~CompWindow();
    2.22  };
    2.23  
    2.24  void add_window(CompWindow *cwin);

     3.1 --- a/src/main.cc	Fri Jan 29 10:23:08 2016 +0200
     3.2 +++ b/src/main.cc	Sat Jan 30 07:48:51 2016 +0200
     3.3 @@ -16,6 +16,7 @@
     3.4  static void start_comp();
     3.5  static void manage_window(Window xwin);
     3.6  static void unmanage_window(Window xwin);
     3.7 +static void damage_window(XDamageNotifyEvent *ev);
     3.8  static void redraw();
     3.9  static void draw_window(CompWindow *cwin);
    3.10  static void reshape(int x, int y);
    3.11 @@ -108,6 +109,7 @@
    3.12  
    3.13  		default:
    3.14  			if(ev.type == xdmg_ev_base + XDamageNotify) {
    3.15 +				damage_window((XDamageNotifyEvent*)&ev);
    3.16  			}
    3.17  		}
    3.18  
    3.19 @@ -217,14 +219,20 @@
    3.20  	CompWindow *cwin = find_window_xid(xwin);
    3.21  	if(!cwin) return;
    3.22  
    3.23 -	if(cwin->xpixmap) {
    3.24 -		XFreePixmap(dpy, cwin->xpixmap);
    3.25 -	}
    3.26 -
    3.27  	remove_window(cwin);
    3.28  	delete cwin;
    3.29  }
    3.30  
    3.31 +static void damage_window(XDamageNotifyEvent *ev)
    3.32 +{
    3.33 +	XserverRegion region;
    3.34 +	CompWindow *cwin = find_window_xid(ev->drawable);
    3.35 +	if(!cwin) return;
    3.36 +
    3.37 +	region = XFixesCreateRegion(dpy, 0, 0);
    3.38 +	XDamageSubtract(dpy, cwin->damage, None, region);
    3.39 +}
    3.40 +
    3.41  static void redraw()
    3.42  {
    3.43  	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);