static void
create_window (GsdLocatePointerData *data,
GdkScreen *screen)
{
GdkColormap *colormap;
GdkVisual *visual;
GdkWindowAttr attributes;
colormap = gdk_screen_get_rgba_colormap (screen);
visual = gdk_screen_get_rgba_visual (screen);
if (!colormap)
{
colormap = gdk_screen_get_rgb_colormap (screen);
visual = gdk_screen_get_rgb_visual (screen);
}
attributes.window_type = GDK_WINDOW_TEMP;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = visual;
attributes.colormap = colormap;
attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK | GDK_EXPOSURE_MASK;
attributes.width = 1;
attributes.height = 1;
data->window = gdk_window_new (gdk_screen_get_root_window (screen),
&attributes,
GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP);
gdk_window_set_user_data (data->window, data->widget);
}
// Look for an existing Colormap that known to be associated with visual.
static Colormap
LookupColormapForVisual(const Screen* screen, const Visual* visual)
{
// common case
if (visual == DefaultVisualOfScreen(screen))
return DefaultColormapOfScreen(screen);
#ifdef MOZ_WIDGET_GTK2
// I wish there were a gdk_x11_display_lookup_screen.
Display* dpy = DisplayOfScreen(screen);
GdkDisplay* gdkDpy = gdk_x11_lookup_xdisplay(dpy);
if (gdkDpy) {
gint screen_num = 0;
for (int s = 0; s < ScreenCount(dpy); ++s) {
if (ScreenOfDisplay(dpy, s) == screen) {
screen_num = s;
break;
}
}
GdkScreen* gdkScreen = gdk_display_get_screen(gdkDpy, screen_num);
GdkColormap* gdkColormap = NULL;
if (visual ==
GDK_VISUAL_XVISUAL(gdk_screen_get_rgb_visual(gdkScreen))) {
// widget/src/gtk2/mozcontainer.c uses gdk_rgb_get_colormap()
// which is inherited by child widgets, so this is the visual
// expected when drawing directly to widget surfaces or surfaces
// created using cairo_surface_create_similar with
// CAIRO_CONTENT_COLOR.
// gdk_screen_get_rgb_colormap is the generalization of
// gdk_rgb_get_colormap for any screen.
gdkColormap = gdk_screen_get_rgb_colormap(gdkScreen);
}
else if (visual ==
GDK_VISUAL_XVISUAL(gdk_screen_get_rgba_visual(gdkScreen))) {
// This is the visual expected on displays with the Composite
// extension enabled when the surface has been created using
// cairo_surface_create_similar with CAIRO_CONTENT_COLOR_ALPHA,
// as happens with non-unit opacity.
gdkColormap = gdk_screen_get_rgba_colormap(gdkScreen);
}
if (gdkColormap != NULL)
return GDK_COLORMAP_XCOLORMAP(gdkColormap);
}
#endif
return None;
}
GtkWidget *
na_tray_child_new (GdkScreen *screen,
Window icon_window)
{
XWindowAttributes window_attributes;
Display *xdisplay;
NaTrayChild *child;
GdkVisual *visual;
gboolean visual_has_alpha;
GdkColormap *colormap;
gboolean new_colormap;
int red_prec, green_prec, blue_prec, depth;
int result;
g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
g_return_val_if_fail (icon_window != None, NULL);
xdisplay = GDK_SCREEN_XDISPLAY (screen);
/* We need to determine the visual of the window we are embedding and create
* the socket in the same visual.
*/
gdk_error_trap_push ();
result = XGetWindowAttributes (xdisplay, icon_window,
&window_attributes);
gdk_error_trap_pop ();
if (!result) /* Window already gone */
return NULL;
visual = gdk_x11_screen_lookup_visual (screen,
window_attributes.visual->visualid);
if (!visual) /* Icon window is on another screen? */
return NULL;
new_colormap = FALSE;
if (visual == gdk_screen_get_rgb_visual (screen))
colormap = gdk_screen_get_rgb_colormap (screen);
else if (visual == gdk_screen_get_rgba_visual (screen))
colormap = gdk_screen_get_rgba_colormap (screen);
else if (visual == gdk_screen_get_system_visual (screen))
colormap = gdk_screen_get_system_colormap (screen);
else
{
colormap = gdk_colormap_new (visual, FALSE);
new_colormap = TRUE;
}
child = g_object_new (NA_TYPE_TRAY_CHILD, NULL);
child->icon_window = icon_window;
gtk_widget_set_colormap (GTK_WIDGET (child), colormap);
/* We have alpha if the visual has something other than red, green,
* and blue */
gdk_visual_get_red_pixel_details (visual, NULL, NULL, &red_prec);
gdk_visual_get_green_pixel_details (visual, NULL, NULL, &green_prec);
gdk_visual_get_blue_pixel_details (visual, NULL, NULL, &blue_prec);
depth = gdk_visual_get_depth (visual);
visual_has_alpha = red_prec + blue_prec + green_prec < depth;
child->has_alpha = (visual_has_alpha &&
gdk_display_supports_composite (gdk_screen_get_display (screen)));
child->composited = child->has_alpha;
if (new_colormap)
g_object_unref (colormap);
return GTK_WIDGET (child);
}
