4 #include <X11/cursorfont.h>
9 Window findClient(Display *d, Window win)
13 Atom state = XInternAtom(d, "WM_STATE", True);
16 unsigned long ret_items, ret_bytesleft;
17 unsigned long *prop_return;
19 XQueryTree(d, win, &r, &r, &children, &n);
20 for (i = 0; i < n; ++i) {
21 Window w = findClient(d, children[i]);
26 XGetWindowProperty(d, win, state, 0, 1,
27 False, state, &ret_type, &ret_format,
28 &ret_items, &ret_bytesleft,
29 (unsigned char**) &prop_return);
30 if (ret_type == None || ret_items < 1)
32 return win; // found it!
35 int main(int argc, char **argv)
37 Display *d = XOpenDisplay(NULL);
38 int s = DefaultScreen(d);
39 Atom net_wm_icon = XInternAtom(d, "_NET_WM_ICON", True);
41 unsigned int winw = 0, winh = 0;
43 unsigned long ret_items, ret_bytesleft;
44 const int MAX_IMAGES = 10;
45 unsigned long *prop_return[MAX_IMAGES];
46 XImage *i[MAX_IMAGES];
48 unsigned int image = 0;
49 unsigned int j; // loop counter
51 printf("Click on a window with an icon...\n");
53 //int id = strtol(argv[1], NULL, 16);
54 XUngrabPointer(d, CurrentTime);
56 Cursor cur = XCreateFontCursor(d, XC_crosshair);
57 XGrabPointer(d, RootWindow(d, s), False, ButtonPressMask, GrabModeAsync,
58 GrabModeAsync, None, cur, CurrentTime);
62 if (ev.type == ButtonPress) {
63 XUngrabPointer(d, CurrentTime);
64 id = findClient(d, ev.xbutton.subwindow);
69 printf("Using window 0x%lx\n", id);
74 XGetWindowProperty(d, id, net_wm_icon, offset++, 1,
75 False, XA_CARDINAL, &ret_type, &ret_format,
76 &ret_items, &ret_bytesleft,
77 (unsigned char**) &prop_return[image]);
78 if (ret_type == None || ret_items < 1) {
79 printf("No icon found\n");
82 w = prop_return[image][0];
83 XFree(prop_return[image]);
85 XGetWindowProperty(d, id, net_wm_icon, offset++, 1,
86 False, XA_CARDINAL, &ret_type, &ret_format,
87 &ret_items, &ret_bytesleft,
88 (unsigned char**) &prop_return[image]);
89 if (ret_type == None || ret_items < 1) {
90 printf("Failed to get height\n");
93 h = prop_return[image][0];
94 XFree(prop_return[image]);
96 XGetWindowProperty(d, id, net_wm_icon, offset, w*h,
97 False, XA_CARDINAL, &ret_type, &ret_format,
98 &ret_items, &ret_bytesleft,
99 (unsigned char**) &prop_return[image]);
100 if (ret_type == None || ret_items < w*h) {
101 printf("Failed to get image data\n");
106 printf("Found icon with size %dx%d\n", w, h);
108 i[image] = XCreateImage(d, DefaultVisual(d, s), DefaultDepth(d, s),
109 ZPixmap, 0, NULL, w, h, 32, 0);
111 i[image]->byte_order = LSBFirst;
112 i[image]->data = (char*)prop_return[image];
113 for (j = 0; j < w*h; j++) {
114 unsigned char alpha = (unsigned char)i[image]->data[j*4+3];
115 unsigned char r = (unsigned char) i[image]->data[j*4+0];
116 unsigned char g = (unsigned char) i[image]->data[j*4+1];
117 unsigned char b = (unsigned char) i[image]->data[j*4+2];
120 unsigned char bgr = 0;
121 unsigned char bgg = 0;
122 unsigned char bgb = 0;
124 r = bgr + (r - bgr) * alpha / 256;
125 g = bgg + (g - bgg) * alpha / 256;
126 b = bgb + (b - bgb) * alpha / 256;
128 i[image]->data[j*4+0] = (char) r;
129 i[image]->data[j*4+1] = (char) g;
130 i[image]->data[j*4+2] = (char) b;
134 if (h > winh) winh = h;
137 } while (ret_bytesleft > 0 && image < MAX_IMAGES);
139 Window win = XCreateSimpleWindow(d, RootWindow(d, s), 0, 0, winw, winh,
144 Pixmap p = XCreatePixmap(d, win, winw, winh, DefaultDepth(d, s));
145 XFillRectangle(d, p, DefaultGC(d, s), 0, 0, winw, winh);
148 for (j = 0; j < image; ++j) {
149 XPutImage(d, p, DefaultGC(d, s), i[j], 0, 0, x, 0,
150 i[j]->width, i[j]->height);
155 XSetWindowBackgroundPixmap(d, win, p);
156 XClearWindow(d, win);