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/*
* Copyright © 2008 Alexander “weej” Jones <alex@weej.com>
* Copyright © 2008 Thomas Perl <thp@thpinfo.com>
* Copyright © 2009 daniel g. siegel <dgsiegel@gnome.org>
*
* Licensed under the GNU General Public License Version 2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* This is a "flash" object that you can create and invoke a method "flash" on to
* flood the screen with white temporarily */
#include <gtk/gtk.h>
#include "cheese-flash.h"
#ifdef GDK_WINDOWING_X11
#include <X11/Xproto.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <gdk/gdkx.h>
#endif /* GDK_WINDOWING_X11 */
/* How long to hold the flash for */
#define FLASH_DURATION 150
/* The factor which defines how much the flash fades per frame */
#define FLASH_FADE_FACTOR 0.95
/* How many frames per second */
#define FLASH_ANIMATION_RATE 120
/* When to consider the flash finished so we can stop fading */
#define FLASH_LOW_THRESHOLD 0.01
G_DEFINE_TYPE (CheeseFlash, cheese_flash, G_TYPE_OBJECT);
#define CHEESE_FLASH_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), CHEESE_TYPE_FLASH, CheeseFlashPrivate))
typedef struct
{
GtkWindow *window;
guint flash_timeout_tag;
guint fade_timeout_tag;
} CheeseFlashPrivate;
static gboolean
cheese_flash_window_draw_event_cb (GtkWidget *widget, cairo_t *cr, gpointer user_data)
{
cairo_fill (cr);
return TRUE;
}
static void
cheese_flash_init (CheeseFlash *self)
{
CheeseFlashPrivate *priv = CHEESE_FLASH_GET_PRIVATE (self);
cairo_region_t *input_region;
GtkWindow *window;
GdkScreen *screen;
GdkVisual *visual;
priv->flash_timeout_tag = 0;
priv->fade_timeout_tag = 0;
window = GTK_WINDOW (gtk_window_new (GTK_WINDOW_POPUP));
/* make it so it doesn't look like a window on the desktop (+fullscreen) */
gtk_window_set_decorated (window, FALSE);
gtk_window_set_skip_taskbar_hint (window, TRUE);
gtk_window_set_skip_pager_hint (window, TRUE);
gtk_window_set_keep_above (window, TRUE);
gtk_window_set_type_hint (window, GDK_WINDOW_TYPE_HINT_NOTIFICATION);
/* Don't take focus */
gtk_window_set_accept_focus (window, FALSE);
gtk_window_set_focus_on_map (window, FALSE);
/* no shadow */
screen = gtk_widget_get_screen (GTK_WIDGET (window));
visual = gdk_screen_get_rgba_visual (screen);
if (visual == NULL)
visual = gdk_screen_get_system_visual (screen);
gtk_widget_set_visual (GTK_WIDGET (window), visual);
/* Don't consume input */
gtk_widget_realize (GTK_WIDGET (window));
input_region = cairo_region_create ();
gdk_window_input_shape_combine_region (gtk_widget_get_window (GTK_WIDGET (window)), input_region, 0, 0);
cairo_region_destroy (input_region);
g_signal_connect (G_OBJECT (window), "draw", G_CALLBACK (cheese_flash_window_draw_event_cb), NULL);
priv->window = window;
}
static void
cheese_flash_dispose (GObject *object)
{
CheeseFlashPrivate *priv = CHEESE_FLASH_GET_PRIVATE (object);
if (priv->window != NULL)
{
gtk_widget_destroy (GTK_WIDGET (priv->window));
priv->window = NULL;
}
if (G_OBJECT_CLASS (cheese_flash_parent_class)->dispose)
G_OBJECT_CLASS (cheese_flash_parent_class)->dispose (object);
}
static void
cheese_flash_finalize (GObject *object)
{
if (G_OBJECT_CLASS (cheese_flash_parent_class)->finalize)
G_OBJECT_CLASS (cheese_flash_parent_class)->finalize (object);
}
static void
cheese_flash_class_init (CheeseFlashClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (CheeseFlashPrivate));
object_class->dispose = cheese_flash_dispose;
object_class->finalize = cheese_flash_finalize;
}
static gboolean
cheese_flash_opacity_fade (gpointer data)
{
CheeseFlash *flash = data;
CheeseFlashPrivate *flash_priv = CHEESE_FLASH_GET_PRIVATE (flash);
GtkWidget *flash_window = GTK_WIDGET (flash_priv->window);
double opacity = gtk_widget_get_opacity (flash_window);
/* exponentially decrease */
gtk_widget_set_opacity (flash_window, opacity * FLASH_FADE_FACTOR);
if (opacity <= FLASH_LOW_THRESHOLD)
{
/* the flasher has finished when we reach the quit value */
gtk_widget_hide (flash_window);
return FALSE;
}
return TRUE;
}
static gboolean
cheese_flash_start_fade (gpointer data)
{
CheeseFlash *self = data;
CheeseFlashPrivate *flash_priv = CHEESE_FLASH_GET_PRIVATE (self);
GtkWindow *flash_window = flash_priv->window;
/* If the screen is non-composited, just hide and finish up */
if (!gdk_screen_is_composited (gtk_window_get_screen (flash_window)))
{
gtk_widget_hide (GTK_WIDGET (flash_window));
return FALSE;
}
flash_priv->fade_timeout_tag =
g_timeout_add_full (G_PRIORITY_DEFAULT,
1000.0 / FLASH_ANIMATION_RATE,
cheese_flash_opacity_fade,
g_object_ref (self), g_object_unref);
return FALSE;
}
void
cheese_flash_fire (CheeseFlash *flash,
GdkRectangle *rect)
{
CheeseFlashPrivate *flash_priv = CHEESE_FLASH_GET_PRIVATE (flash);
GtkWindow *flash_window = flash_priv->window;
if (flash_priv->flash_timeout_tag > 0)
g_source_remove (flash_priv->flash_timeout_tag);
if (flash_priv->fade_timeout_tag > 0)
g_source_remove (flash_priv->fade_timeout_tag);
gtk_window_resize (flash_window, rect->width, rect->height);
gtk_window_move (flash_window, rect->x, rect->y);
gtk_widget_set_opacity (GTK_WIDGET (flash_window), 0.99);
gtk_widget_show_all (GTK_WIDGET (flash_window));
flash_priv->flash_timeout_tag =
g_timeout_add_full (G_PRIORITY_DEFAULT,
FLASH_DURATION,
cheese_flash_start_fade,
g_object_ref (flash), g_object_unref);
}
CheeseFlash *
cheese_flash_new (void)
{
return g_object_new (CHEESE_TYPE_FLASH, NULL);
}
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