From 861de251bf2b7a382733906b7ffd38a035a8f476 Mon Sep 17 00:00:00 2001
From: Iain Patterson <me@iain.cx>
Date: Mon, 9 Mar 2009 16:10:29 +0000
Subject: [PATCH] Stability

Use XGetWindowAttributes() instead of XGetGeometry().
---
 pager.c | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/pager.c b/pager.c
index c351049..e18a3d1 100644
--- a/pager.c
+++ b/pager.c
@@ -16,8 +16,7 @@ static int desktop = -1;
 static Window drag_window;
 static int drag_x, drag_y;
 static int drag_button;
-static int dockapp_x, dockapp_y;
-static unsigned int dockapp_width, dockapp_height, dockapp_border, dockapp_depth;
+static XWindowAttributes dockapp_attr;
 static double aspect, scale;
 
 static int desktop_geometry_supported;
@@ -94,7 +93,7 @@ void check_support() {
 }
 
 void enumerate_clients(client_t ***clients, unsigned long *num_clients, unsigned long *active_desktop, unsigned long *active_window) {
-  Window root, qroot, qparent, dockapp_root, child, *wins, client;
+  Window root, qroot, qparent, child, *wins, client;
   int x, y;
   unsigned int width, height, border, depth;
   unsigned int root_width, root_height;
@@ -115,18 +114,21 @@ void enumerate_clients(client_t ***clients, unsigned long *num_clients, unsigned
     root_height = DisplayWidth(DADisplay, DefaultScreen(DADisplay));
   }
 
-  XGetGeometry(DADisplay, DAWindow, &dockapp_root, &dockapp_x, &dockapp_y, &dockapp_width, &dockapp_height, &dockapp_border, &dockapp_depth);
-  scale = (double) root_width / (double) dockapp_width;
-  aspect = (double) root_height / (double) dockapp_height;
+  *num_clients = 0;
+  *clients = 0;
 
-  *active_window = get_atom_long(active_window_atom, XA_WINDOW, dockapp_root);
+  if (! XGetWindowAttributes(DADisplay, DAWindow, &dockapp_attr)) return;
+  scale = (double) root_width / (double) dockapp_attr.width;
+  aspect = (double) root_height / (double) dockapp_attr.height;
+
+  *active_window = get_atom_long(active_window_atom, XA_WINDOW, dockapp_attr.root);
   *active_desktop = get_atom_long(current_desktop_atom, XA_CARDINAL, DefaultRootWindow(DADisplay));
 
   if (client_list_supported) {
-    get_atom_longs(client_list_atom, XA_WINDOW, dockapp_root, &data, num_clients);
+    get_atom_longs(client_list_atom, XA_WINDOW, dockapp_attr.root, &data, num_clients);
   }
   else {
-    XQueryTree(DADisplay, dockapp_root, &qroot, &qparent, &wins, (unsigned int *) num_clients);
+    XQueryTree(DADisplay, dockapp_attr.root, &qroot, &qparent, &wins, (unsigned int *) num_clients);
   }
 
   *clients = (client_t **) malloc(sizeof(client_t *) * *num_clients);
@@ -190,7 +192,7 @@ void destroy_clients(client_t ***clients, unsigned long num_clients) {
 
   if (! *clients) return;
 
-  for (i = 0; i < num_clients; i++) free((*clients)[i]);
+  for (i = 0; i < num_clients; i++) if ((*clients)[i]) free((*clients)[i]);
   free(*clients);
 }
 
@@ -307,10 +309,10 @@ void page() {
 
   enumerate_clients(&clients, &num_clients, &active_desktop, &active_window);
 
-  pixmap = XCreatePixmap(DADisplay, DAWindow, dockapp_width, dockapp_height, dockapp_depth);
+  pixmap = XCreatePixmap(DADisplay, DAWindow, dockapp_attr.width, dockapp_attr.height, dockapp_attr.depth);
   if (active_desktop == desktop || desktop < 0) gc = active_desktopGC;
   else gc = inactive_desktopGC;
-  draw_relief(pixmap, dockapp_width, dockapp_height, gc);
+  draw_relief(pixmap, dockapp_attr.width, dockapp_attr.height, gc);
 
   for (i = 0; i < num_clients; i++) {
     if (! clients[i]->window) continue;
@@ -350,7 +352,7 @@ void move(int x, int y) {
 
   if (! drag_window) return;
   if (x < 0 || y < 0) return;
-  if (x >= dockapp_width || y >= dockapp_height) return;
+  if (x >= dockapp_attr.width || y >= dockapp_attr.height) return;
 
   dest_x = (long) ((double) (x - drag_x) * scale);
   dest_y = (long) ((double) (y - drag_y) * scale);
@@ -381,17 +383,17 @@ int main(int argc, char **argv) {
   aspect = (double) root_width / (double) root_height;
 
   if (root_width > root_height) {
-    dockapp_width = DOCKAPP_SIZE;
-    dockapp_height = (double) DOCKAPP_SIZE / aspect;
+    dockapp_attr.width = DOCKAPP_SIZE;
+    dockapp_attr.height = (double) DOCKAPP_SIZE / aspect;
   }
   else {
-    dockapp_height = DOCKAPP_SIZE;
-    dockapp_width = (double) DOCKAPP_SIZE / aspect;
+    dockapp_attr.height = DOCKAPP_SIZE;
+    dockapp_attr.width = (double) DOCKAPP_SIZE / aspect;
   }
 
   DAParseArguments(argc, argv, &options, 1, "OPTIONS", "pager");
   DAOpenDisplay(0, argc, argv);
-  DACreateIcon("pager", dockapp_width, dockapp_height, argc, argv);
+  DACreateIcon("pager", dockapp_attr.width, dockapp_attr.height, argc, argv);
 
   DASetCallbacks(&callbacks);
   DASetTimeout(SPEED);
-- 
2.20.1