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Allow more flexibility for NaTrayChild compositing

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na-tray-child.[ch]: Add na_tray_child_set_composited() to allow the
 application to modify the behavior where gdk_window_set_composited(TRUE)
 is called for icons with alpha. Rename na_tray_child_is_composited() to
 na_tray_child_has_alpha() to better reflect the meaning and fix things
 so that it can be called at any time and not only after the icon is
 realized.
na-tray.c: Adapt to na_tray_child_is_composited() rename.

http://bugzilla.gnome.org/show_bug.cgi?id=579454
This commit is contained in:
Owen W. Taylor 2009-04-18 17:05:14 -04:00
parent bb92791bd3
commit 58e718ac0c
2 changed files with 60 additions and 21 deletions
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66
src/tray/na-tray-child.c
View File

@ -42,15 +42,10 @@ na_tray_child_realize (GtkWidget *widget)
{
NaTrayChild *child = NA_TRAY_CHILD (widget);
GdkVisual *visual = gtk_widget_get_visual (widget);
gboolean visual_has_alpha;
GTK_WIDGET_CLASS (na_tray_child_parent_class)->realize (widget);
/* We have alpha if the visual has something other than red, green,
* and blue */
visual_has_alpha = visual->red_prec + visual->blue_prec + visual->green_prec < visual->depth;
if (visual_has_alpha && gdk_display_supports_composite (gtk_widget_get_display (widget)))
if (child->has_alpha)
{
/* We have real transparency with an ARGB visual and the Composite
* extension. */
@ -60,7 +55,6 @@ na_tray_child_realize (GtkWidget *widget)
gdk_window_set_background (widget->window, &transparent);
gdk_window_set_composited (widget->window, TRUE);
child->is_composited = TRUE;
child->parent_relative_bg = FALSE;
}
else if (visual == gdk_drawable_get_visual (GDK_DRAWABLE (gdk_window_get_parent (widget->window))))
@ -69,18 +63,18 @@ na_tray_child_realize (GtkWidget *widget)
* can use a parent-relative background and fake transparency. */
gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
child->is_composited = FALSE;
child->parent_relative_bg = TRUE;
}
else
{
/* Nothing to do; the icon will sit on top of an ugly gray box */
child->is_composited = FALSE;
child->parent_relative_bg = FALSE;
}
gdk_window_set_composited (widget->window, child->composited);
gtk_widget_set_app_paintable (GTK_WIDGET (child),
child->parent_relative_bg || child->is_composited);
child->parent_relative_bg || child->has_alpha);
/* Double-buffering will interfere with the parent-relative-background fake
* transparency, since the double-buffer code doesn't know how to fill in the
@ -152,7 +146,7 @@ na_tray_child_size_allocate (GtkWidget *widget,
*/
if ((moved || resized) && GTK_WIDGET_MAPPED (widget))
{
if (na_tray_child_is_composited (child))
if (na_tray_child_has_alpha (child))
gdk_window_invalidate_rect (gdk_window_get_parent (widget->window),
&widget->allocation, FALSE);
}
@ -162,7 +156,7 @@ na_tray_child_size_allocate (GtkWidget *widget,
if ((moved || resized) && GTK_WIDGET_MAPPED (widget))
{
if (na_tray_child_is_composited (NA_TRAY_CHILD (widget)))
if (na_tray_child_has_alpha (NA_TRAY_CHILD (widget)))
gdk_window_invalidate_rect (gdk_window_get_parent (widget->window),
&widget->allocation, FALSE);
else if (moved && child->parent_relative_bg)
@ -180,7 +174,7 @@ na_tray_child_expose_event (GtkWidget *widget,
{
NaTrayChild *child = NA_TRAY_CHILD (widget);
if (na_tray_child_is_composited (child))
if (na_tray_child_has_alpha (child))
{
/* Clear to transparent */
cairo_t *cr = gdk_cairo_create (widget->window);
@ -230,6 +224,7 @@ na_tray_child_new (GdkScreen *screen,
Display *xdisplay;
NaTrayChild *child;
GdkVisual *visual;
gboolean visual_has_alpha;
GdkColormap *colormap;
gboolean new_colormap;
int result;
@ -275,6 +270,14 @@ na_tray_child_new (GdkScreen *screen,
gtk_widget_set_colormap (GTK_WIDGET (child), colormap);
/* We have alpha if the visual has something other than red, green,
* and blue */
visual_has_alpha = visual->red_prec + visual->blue_prec + visual->green_prec < visual->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);
@ -335,12 +338,45 @@ na_tray_child_get_title (NaTrayChild *child)
return retval;
}
/**
* na_tray_child_has_alpha;
* @child: a #NaTrayChild
*
* Checks if the child has an ARGB visual and real alpha transparence.
* (as opposed to faked alpha transparency with an parent-relative
* background)
*
* Return value: %TRUE if the child has an alpha transparency
*/
gboolean
na_tray_child_is_composited (NaTrayChild *child)
na_tray_child_has_alpha (NaTrayChild *child)
{
g_return_val_if_fail (NA_IS_TRAY_CHILD (child), FALSE);
return child->is_composited;
return child->has_alpha;
}
/**
* na_tray_child_set_composited;
* @child: a #NaTrayChild
* @composited: %TRUE if the child's window should be redirected
*
* Sets whether the #GdkWindow of the child should be set redirected
* using gdk_window_set_composited(). By default this is based off of
* na_tray_child_has_alpha(), but it may be useful to override it in
* certain circumstances; for example, if the #NaTrayChild is added
* to a parent window and that parent window is composited against the
* background.
*/
void
na_tray_child_set_composited (NaTrayChild *child,
gboolean composited)
{
g_return_if_fail (NA_IS_TRAY_CHILD (child));
child->composited = composited;
if (GTK_WIDGET_REALIZED (child))
gdk_window_set_composited (GTK_WIDGET (child)->window, composited);
}
/* If we are faking transparency with a window-relative background, force a

7
src/tray/na-tray-child.h
View File

@ -43,7 +43,8 @@ struct _NaTrayChild
{
GtkSocket parent_instance;
Window icon_window;
guint is_composited : 1;
guint has_alpha : 1;
guint composited : 1;
guint parent_relative_bg : 1;
};
@ -57,7 +58,9 @@ GType na_tray_child_get_type (void);
GtkWidget *na_tray_child_new (GdkScreen *screen,
Window icon_window);
char *na_tray_child_get_title (NaTrayChild *child);
gboolean na_tray_child_is_composited (NaTrayChild *child);
gboolean na_tray_child_has_alpha (NaTrayChild *child);
void na_tray_child_set_composited (NaTrayChild *child,
gboolean composited);
void na_tray_child_force_redraw (NaTrayChild *child);
G_END_DECLS