/* Offscreen Windows/Effects * * Offscreen windows can be used to render elements multiple times to achieve * various effects. */ #include #include #define GTK_TYPE_MIRROR_BIN (gtk_mirror_bin_get_type ()) #define GTK_MIRROR_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_MIRROR_BIN, GtkMirrorBin)) #define GTK_MIRROR_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_MIRROR_BIN, GtkMirrorBinClass)) #define GTK_IS_MIRROR_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_MIRROR_BIN)) #define GTK_IS_MIRROR_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_MIRROR_BIN)) #define GTK_MIRROR_BIN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_MIRROR_BIN, GtkMirrorBinClass)) typedef struct _GtkMirrorBin GtkMirrorBin; typedef struct _GtkMirrorBinClass GtkMirrorBinClass; struct _GtkMirrorBin { GtkContainer container; GtkWidget *child; GdkWindow *offscreen_window; }; struct _GtkMirrorBinClass { GtkContainerClass parent_class; }; GType gtk_mirror_bin_get_type (void) G_GNUC_CONST; GtkWidget* gtk_mirror_bin_new (void); /*** implementation ***/ static void gtk_mirror_bin_realize (GtkWidget *widget); static void gtk_mirror_bin_unrealize (GtkWidget *widget); static void gtk_mirror_bin_get_preferred_width (GtkWidget *widget, gint *minimum, gint *natural); static void gtk_mirror_bin_get_preferred_height (GtkWidget *widget, gint *minimum, gint *natural); static void gtk_mirror_bin_size_allocate (GtkWidget *widget, GtkAllocation *allocation); static gboolean gtk_mirror_bin_damage (GtkWidget *widget, GdkEventExpose *event); static gboolean gtk_mirror_bin_draw (GtkWidget *widget, cairo_t *cr); static void gtk_mirror_bin_add (GtkContainer *container, GtkWidget *child); static void gtk_mirror_bin_remove (GtkContainer *container, GtkWidget *widget); static void gtk_mirror_bin_forall (GtkContainer *container, gboolean include_internals, GtkCallback callback, gpointer callback_data); static GType gtk_mirror_bin_child_type (GtkContainer *container); G_DEFINE_TYPE (GtkMirrorBin, gtk_mirror_bin, GTK_TYPE_CONTAINER); static void to_child (GtkMirrorBin *bin, double widget_x, double widget_y, double *x_out, double *y_out) { *x_out = widget_x; *y_out = widget_y; } static void to_parent (GtkMirrorBin *bin, double offscreen_x, double offscreen_y, double *x_out, double *y_out) { *x_out = offscreen_x; *y_out = offscreen_y; } static void gtk_mirror_bin_class_init (GtkMirrorBinClass *klass) { GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass); widget_class->realize = gtk_mirror_bin_realize; widget_class->unrealize = gtk_mirror_bin_unrealize; widget_class->get_preferred_width = gtk_mirror_bin_get_preferred_width; widget_class->get_preferred_height = gtk_mirror_bin_get_preferred_height; widget_class->size_allocate = gtk_mirror_bin_size_allocate; widget_class->draw = gtk_mirror_bin_draw; g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET), GTK_TYPE_MIRROR_BIN, g_cclosure_new (G_CALLBACK (gtk_mirror_bin_damage), NULL, NULL)); container_class->add = gtk_mirror_bin_add; container_class->remove = gtk_mirror_bin_remove; container_class->forall = gtk_mirror_bin_forall; container_class->child_type = gtk_mirror_bin_child_type; } static void gtk_mirror_bin_init (GtkMirrorBin *bin) { gtk_widget_set_has_window (GTK_WIDGET (bin), TRUE); } GtkWidget * gtk_mirror_bin_new (void) { return g_object_new (GTK_TYPE_MIRROR_BIN, NULL); } static GdkWindow * pick_offscreen_child (GdkWindow *offscreen_window, double widget_x, double widget_y, GtkMirrorBin *bin) { GtkAllocation child_area; double x, y; if (bin->child && gtk_widget_get_visible (bin->child)) { to_child (bin, widget_x, widget_y, &x, &y); gtk_widget_get_allocation (bin->child, &child_area); if (x >= 0 && x < child_area.width && y >= 0 && y < child_area.height) return bin->offscreen_window; } return NULL; } static void offscreen_window_to_parent (GdkWindow *offscreen_window, double offscreen_x, double offscreen_y, double *parent_x, double *parent_y, GtkMirrorBin *bin) { to_parent (bin, offscreen_x, offscreen_y, parent_x, parent_y); } static void offscreen_window_from_parent (GdkWindow *window, double parent_x, double parent_y, double *offscreen_x, double *offscreen_y, GtkMirrorBin *bin) { to_child (bin, parent_x, parent_y, offscreen_x, offscreen_y); } static void gtk_mirror_bin_realize (GtkWidget *widget) { GtkMirrorBin *bin = GTK_MIRROR_BIN (widget); GtkAllocation allocation; GtkStyleContext *context; GdkWindow *window; GdkWindowAttr attributes; gint attributes_mask; guint border_width; GtkRequisition child_requisition; gtk_widget_set_realized (widget, TRUE); gtk_widget_get_allocation (widget, &allocation); border_width = gtk_container_get_border_width (GTK_CONTAINER (widget)); attributes.x = allocation.x + border_width; attributes.y = allocation.y + border_width; attributes.width = allocation.width - 2 * border_width; attributes.height = allocation.height - 2 * border_width; attributes.window_type = GDK_WINDOW_CHILD; attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK | GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_SCROLL_MASK | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK; attributes.visual = gtk_widget_get_visual (widget); attributes.wclass = GDK_INPUT_OUTPUT; attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL; window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask); gtk_widget_set_window (widget, window); gdk_window_set_user_data (window, widget); g_signal_connect (window, "pick-embedded-child", G_CALLBACK (pick_offscreen_child), bin); attributes.window_type = GDK_WINDOW_OFFSCREEN; child_requisition.width = child_requisition.height = 0; if (bin->child && gtk_widget_get_visible (bin->child)) { GtkAllocation child_allocation; gtk_widget_get_allocation (bin->child, &child_allocation); attributes.width = child_allocation.width; attributes.height = child_allocation.height; } bin->offscreen_window = gdk_window_new (gtk_widget_get_root_window (widget), &attributes, attributes_mask); gdk_window_set_user_data (bin->offscreen_window, widget); if (bin->child) gtk_widget_set_parent_window (bin->child, bin->offscreen_window); gdk_offscreen_window_set_embedder (bin->offscreen_window, window); g_signal_connect (bin->offscreen_window, "to-embedder", G_CALLBACK (offscreen_window_to_parent), bin); g_signal_connect (bin->offscreen_window, "from-embedder", G_CALLBACK (offscreen_window_from_parent), bin); context = gtk_widget_get_style_context (widget); gtk_style_context_set_background (context, window); gtk_style_context_set_background (context, bin->offscreen_window); gdk_window_show (bin->offscreen_window); } static void gtk_mirror_bin_unrealize (GtkWidget *widget) { GtkMirrorBin *bin = GTK_MIRROR_BIN (widget); gdk_window_set_user_data (bin->offscreen_window, NULL); gdk_window_destroy (bin->offscreen_window); bin->offscreen_window = NULL; GTK_WIDGET_CLASS (gtk_mirror_bin_parent_class)->unrealize (widget); } static GType gtk_mirror_bin_child_type (GtkContainer *container) { GtkMirrorBin *bin = GTK_MIRROR_BIN (container); if (bin->child) return G_TYPE_NONE; return GTK_TYPE_WIDGET; } static void gtk_mirror_bin_add (GtkContainer *container, GtkWidget *widget) { GtkMirrorBin *bin = GTK_MIRROR_BIN (container); if (!bin->child) { gtk_widget_set_parent_window (widget, bin->offscreen_window); gtk_widget_set_parent (widget, GTK_WIDGET (bin)); bin->child = widget; } else g_warning ("GtkMirrorBin cannot have more than one child\n"); } static void gtk_mirror_bin_remove (GtkContainer *container, GtkWidget *widget) { GtkMirrorBin *bin = GTK_MIRROR_BIN (container); gboolean was_visible; was_visible = gtk_widget_get_visible (widget); if (bin->child == widget) { gtk_widget_unparent (widget); bin->child = NULL; if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container))) gtk_widget_queue_resize (GTK_WIDGET (container)); } } static void gtk_mirror_bin_forall (GtkContainer *container, gboolean include_internals, GtkCallback callback, gpointer callback_data) { GtkMirrorBin *bin = GTK_MIRROR_BIN (container); g_return_if_fail (callback != NULL); if (bin->child) (*callback) (bin->child, callback_data); } static void gtk_mirror_bin_size_request (GtkWidget *widget, GtkRequisition *requisition) { GtkMirrorBin *bin = GTK_MIRROR_BIN (widget); GtkRequisition child_requisition; guint border_width; child_requisition.width = 0; child_requisition.height = 0; if (bin->child && gtk_widget_get_visible (bin->child)) gtk_widget_get_preferred_size ( (bin->child), &child_requisition, NULL); border_width = gtk_container_get_border_width (GTK_CONTAINER (widget)); requisition->width = border_width * 2 + child_requisition.width + 10; requisition->height = border_width * 2 + child_requisition.height * 2 + 10; } static void gtk_mirror_bin_get_preferred_width (GtkWidget *widget, gint *minimum, gint *natural) { GtkRequisition requisition; gtk_mirror_bin_size_request (widget, &requisition); *minimum = *natural = requisition.width; } static void gtk_mirror_bin_get_preferred_height (GtkWidget *widget, gint *minimum, gint *natural) { GtkRequisition requisition; gtk_mirror_bin_size_request (widget, &requisition); *minimum = *natural = requisition.width; } static void gtk_mirror_bin_size_allocate (GtkWidget *widget, GtkAllocation *allocation) { GtkMirrorBin *bin = GTK_MIRROR_BIN (widget); gint w, h; guint border_width; gtk_widget_set_allocation (widget, allocation); border_width = gtk_container_get_border_width (GTK_CONTAINER (widget)); w = allocation->width - border_width * 2; h = allocation->height - border_width * 2; if (gtk_widget_get_realized (widget)) gdk_window_move_resize (gtk_widget_get_window (widget), allocation->x + border_width, allocation->y + border_width, w, h); if (bin->child && gtk_widget_get_visible (bin->child)) { GtkRequisition child_requisition; GtkAllocation child_allocation; gtk_widget_get_preferred_size (bin->child, &child_requisition, NULL); child_allocation.x = 0; child_allocation.y = 0; child_allocation.height = child_requisition.height; child_allocation.width = child_requisition.width; if (gtk_widget_get_realized (widget)) gdk_window_move_resize (bin->offscreen_window, allocation->x + border_width, allocation->y + border_width, child_allocation.width, child_allocation.height); gtk_widget_size_allocate (bin->child, &child_allocation); } } static gboolean gtk_mirror_bin_damage (GtkWidget *widget, GdkEventExpose *event) { gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE); return TRUE; } static gboolean gtk_mirror_bin_draw (GtkWidget *widget, cairo_t *cr) { GtkMirrorBin *bin = GTK_MIRROR_BIN (widget); GdkWindow *window; window = gtk_widget_get_window (widget); if (gtk_cairo_should_draw_window (cr, window)) { cairo_surface_t *surface; cairo_matrix_t matrix; cairo_pattern_t *mask; int height; if (bin->child && gtk_widget_get_visible (bin->child)) { surface = gdk_offscreen_window_get_surface (bin->offscreen_window); height = gdk_window_get_height (bin->offscreen_window); /* paint the offscreen child */ cairo_set_source_surface (cr, surface, 0, 0); cairo_paint (cr); cairo_matrix_init (&matrix, 1.0, 0.0, 0.3, 1.0, 0.0, 0.0); cairo_matrix_scale (&matrix, 1.0, -1.0); cairo_matrix_translate (&matrix, -10, - 3 * height - 10); cairo_transform (cr, &matrix); cairo_set_source_surface (cr, surface, 0, height); /* create linear gradient as mask-pattern to fade out the source */ mask = cairo_pattern_create_linear (0.0, height, 0.0, 2*height); cairo_pattern_add_color_stop_rgba (mask, 0.0, 0.0, 0.0, 0.0, 0.0); cairo_pattern_add_color_stop_rgba (mask, 0.25, 0.0, 0.0, 0.0, 0.01); cairo_pattern_add_color_stop_rgba (mask, 0.5, 0.0, 0.0, 0.0, 0.25); cairo_pattern_add_color_stop_rgba (mask, 0.75, 0.0, 0.0, 0.0, 0.5); cairo_pattern_add_color_stop_rgba (mask, 1.0, 0.0, 0.0, 0.0, 1.0); /* paint the reflection */ cairo_mask (cr, mask); cairo_pattern_destroy (mask); } } else if (gtk_cairo_should_draw_window (cr, bin->offscreen_window)) { gtk_render_background (gtk_widget_get_style_context (widget), cr, 0, 0, gdk_window_get_width (bin->offscreen_window), gdk_window_get_height (bin->offscreen_window)); if (bin->child) gtk_container_propagate_draw (GTK_CONTAINER (widget), bin->child, cr); } return FALSE; } /*** ***/ static GtkWidget *window = NULL; GtkWidget * do_offscreen_window2 (GtkWidget *do_widget) { if (!window) { GtkWidget *bin, *vbox; GtkWidget *hbox, *entry, *applybutton, *backbutton; GtkSizeGroup *group; window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_screen (GTK_WINDOW (window), gtk_widget_get_screen (do_widget)); gtk_window_set_title (GTK_WINDOW (window), "Effects"); g_signal_connect (window, "destroy", G_CALLBACK (gtk_widget_destroyed), &window); gtk_container_set_border_width (GTK_CONTAINER (window), 10); vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0); bin = gtk_mirror_bin_new (); group = gtk_size_group_new (GTK_SIZE_GROUP_VERTICAL); hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6); backbutton = gtk_button_new (); gtk_container_add (GTK_CONTAINER (backbutton), gtk_image_new_from_icon_name ("go-previous", 4)); gtk_size_group_add_widget (group, backbutton); entry = gtk_entry_new (); gtk_size_group_add_widget (group, entry); applybutton = gtk_button_new_with_label (_("Apply")); gtk_size_group_add_widget (group, applybutton); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE, 0); gtk_container_add (GTK_CONTAINER (bin), hbox); gtk_box_pack_start (GTK_BOX (hbox), backbutton, FALSE, FALSE, 0); gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0); gtk_box_pack_start (GTK_BOX (hbox), applybutton, FALSE, FALSE, 0); } if (!gtk_widget_get_visible (window)) gtk_widget_show_all (window); else { gtk_widget_destroy (window); window = NULL; } return window; }