Merge lp:~3v1n0/unity/fix-windowbuttons-crash into lp:unity

[Marco Trevisan (Treviño)]

Fix crash on missing dash WindowButton files

Improved the PanelStyle code to support the Maximize window button and to draw the cairo fallback version.
WindowButtons now uses less code duplication.

Testcase
1) remove your $prefix/share/unity/5/unmaximize_dash* $prefix/share/unity/5/maximize_dash* and so
2) restart unity, but it will always crash.

[Tim Penhey (thumper)]

Looks fine.

review: Approve

=== modified file 'plugins/unityshell/src/PanelStyle.cpp'
--- plugins/unityshell/src/PanelStyle.cpp	2012-02-08 21:44:50 +0000
+++ plugins/unityshell/src/PanelStyle.cpp	2012-02-17 04:18:18 +0000
@@ -207,12 +207,12 @@
   }
 
   if (!texture)
-    texture = GetWindowButtonForTheme(type, state);
+    texture = GetFallbackWindowButton(type, state);
 
   return texture;
 }
 
-nux::BaseTexture* Style::GetWindowButtonForTheme(WindowButtonType type,
+nux::BaseTexture* Style::GetFallbackWindowButton(WindowButtonType type,
                                                  WindowState state)
 {
   int width = 18, height = 18;
@@ -231,6 +231,8 @@
     main = main * 1.2f;
   else if (state == WindowState::PRESSED)
     main = main * 0.8f;
+  else if (state == WindowState::DISABLED)
+    main = main * 0.5f;
 
   cr  = cairo_graphics.GetContext();
   cairo_translate(cr, 0.5, 0.5);
@@ -258,7 +260,15 @@
     cairo_move_to(cr, w, height / 2.0f);
     cairo_line_to(cr, width - w, height / 2.0f);
   }
-  else
+  else if (type == WindowButtonType::UNMAXIMIZE)
+  {
+    cairo_move_to(cr, w, h + h/5.0f);
+    cairo_line_to(cr, width - w, h + h/5.0f);
+    cairo_line_to(cr, width - w, height - h - h/5.0f);
+    cairo_line_to(cr, w, height - h - h/5.0f);
+    cairo_close_path(cr);
+  }
+  else // if (type == WindowButtonType::MAXIMIZE)
   {
     cairo_move_to(cr, w, h);
     cairo_line_to(cr, width - w, h);
 
=== modified file 'plugins/unityshell/src/PanelStyle.h'
--- plugins/unityshell/src/PanelStyle.h	2012-02-12 15:48:12 +0000
+++ plugins/unityshell/src/PanelStyle.h	2012-02-17 04:18:18 +0000
@@ -35,7 +35,8 @@
 {
   CLOSE,
   MINIMIZE,
-  UNMAXIMIZE
+  UNMAXIMIZE,
+  MAXIMIZE
 };
 
 enum class WindowState
@@ -59,6 +60,7 @@
   nux::NBitmapData* GetBackground(int width, int height, float opacity);
 
   nux::BaseTexture* GetWindowButton(WindowButtonType type, WindowState state);
+  nux::BaseTexture* GetFallbackWindowButton(WindowButtonType type, WindowState state);
 
   GdkPixbuf* GetHomeButton();
 
@@ -74,9 +76,6 @@
   static void OnGtkThemeChanged(GObject*    gobject,
                                 GParamSpec* pspec,
                                 gpointer    data);
-
-  nux::BaseTexture* GetWindowButtonForTheme(WindowButtonType type,
-                                            WindowState state);
 private:
   GtkStyleContext*   _style_context;
   char*              _theme_name;
 
=== modified file 'plugins/unityshell/src/WindowButtons.cpp'
--- plugins/unityshell/src/WindowButtons.cpp	2012-02-12 15:48:12 +0000
+++ plugins/unityshell/src/WindowButtons.cpp	2012-02-17 04:18:18 +0000
@@ -190,6 +190,13 @@
     if (_type != panel::WindowButtonType::UNMAXIMIZE)
       return;
 
+    panel::WindowButtonType real_type = panel::WindowButtonType::UNMAXIMIZE;
+
+    if (dash::Settings::Instance().GetFormFactor() == dash::FormFactor::DESKTOP)
+    {
+      real_type = panel::WindowButtonType::MAXIMIZE;
+    }
+
     if (_normal_dash_tex)
       _normal_dash_tex->UnReference();
     if (_prelight_dash_tex)
@@ -198,22 +205,11 @@
       _pressed_dash_tex->UnReference();
 
     //!!FIXME!! - don't have disabled instances of the (un)maximize buttons
-    if (dash::Settings::Instance().GetFormFactor() == dash::FormFactor::DESKTOP)
-    {
-      // get maximize buttons
-      _normal_dash_tex = GetDashMaximizeWindowButton(panel::WindowState::NORMAL);
-      _prelight_dash_tex = GetDashMaximizeWindowButton(panel::WindowState::PRELIGHT);
-      _pressed_dash_tex = GetDashMaximizeWindowButton(panel::WindowState::PRESSED);
-      _disabled_dash_tex = GetDashMaximizeWindowButton(panel::WindowState::DISABLED); 
-    }
-    else
-    {
-      // get unmaximize buttons
-      _normal_dash_tex = GetDashWindowButton(_type, panel::WindowState::NORMAL);
-      _prelight_dash_tex = GetDashWindowButton(_type, panel::WindowState::PRELIGHT);
-      _pressed_dash_tex = GetDashWindowButton(_type, panel::WindowState::PRESSED);
-      _disabled_dash_tex = GetDashWindowButton(_type, panel::WindowState::DISABLED);
-    }
+    // get (un)maximize buttons
+    _normal_dash_tex = GetDashWindowButton(real_type, panel::WindowState::NORMAL);
+    _prelight_dash_tex = GetDashWindowButton(real_type, panel::WindowState::PRELIGHT);
+    _pressed_dash_tex = GetDashWindowButton(real_type, panel::WindowState::PRESSED);
+    _disabled_dash_tex = GetDashWindowButton(real_type, panel::WindowState::DISABLED);
 
     // still check if the dash is really opened,
     // someone could change the form factor through dconf
@@ -292,7 +288,8 @@
   nux::BaseTexture* GetDashWindowButton(panel::WindowButtonType type,
                                         panel::WindowState state)
   {
-    const char* names[] = { "close_dash", "minimize_dash", "unmaximize_dash" };
+    nux::BaseTexture* texture = nullptr;
+    const char* names[] = { "close_dash", "minimize_dash", "unmaximize_dash", "maximize_dash" };
     const char* states[] = { "", "_prelight", "_pressed", "_disabled" };
 
     std::ostringstream subpath;
@@ -302,26 +299,15 @@
     glib::String filename(g_build_filename(PKGDATADIR, subpath.str().c_str(), NULL));
 
     glib::Error error;
-    glib::Object<GdkPixbuf> pixbuf(gdk_pixbuf_new_from_file(filename.Value(), &error));
-
-    // not handling broken texture or missing files
-    return nux::CreateTexture2DFromPixbuf(pixbuf, true);
-  }
-
-  nux::BaseTexture* GetDashMaximizeWindowButton(panel::WindowState state)
-  {
-    const char* states[] = { "", "_prelight", "_pressed", "_disabled" };
-
-    std::ostringstream subpath;
-    subpath << "maximize_dash" << states[static_cast<int>(state)] << ".png";
-
-    glib::String filename(g_build_filename(PKGDATADIR, subpath.str().c_str(), NULL));
-
-    glib::Error error;
-    glib::Object<GdkPixbuf> pixbuf(gdk_pixbuf_new_from_file(filename.Value(), &error));
-
-    // not handling broken texture or missing files
-    return nux::CreateTexture2DFromPixbuf(pixbuf, true);
+    glib::Object<GdkPixbuf> pixbuf(gdk_pixbuf_new_from_file(filename, &error));
+
+    if (pixbuf && !error)
+      texture = nux::CreateTexture2DFromPixbuf(pixbuf, true);
+
+    if (!texture)
+      texture = panel::Style::Instance().GetFallbackWindowButton(type, state);
+
+    return texture;
   }
 };