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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/>.
*/
#include "config.h"
#ifdef HAVE_X11
#include <gtk/gtk.h>
#include "cheese-flash.h"
/**
* SECTION:cheese-flash
* @short_description: Flash the screen, like a real camera flash
* @stability: Unstable
* @include: cheese/cheese-flash.h
*
* #CheeseFlash is a window that you can create and invoke a method "flash" on
* to temporarily flood the screen with white.
*/
/* How long to hold the flash for, in milliseconds. */
static const guint FLASH_DURATION = 150;
/* The factor which defines how much the flash fades per frame */
static const gdouble FLASH_FADE_FACTOR = 0.95;
/* How many frames per second */
static const guint FLASH_ANIMATION_RATE = 120;
/* When to consider the flash finished so we can stop fading */
static const gdouble FLASH_LOW_THRESHOLD = 0.01;
/*
* CheeseFlashPrivate:
* @flash_timeout_tag: signal ID of the timeout to start fading in the flash
* @fade_timeout_tag: signal ID of the timeout to start fading out the flash
*
* Private data for #CheeseFlash.
*/
typedef struct
{
/*< private >*/
guint flash_timeout_tag;
guint fade_timeout_tag;
gdouble opacity;
} CheeseFlashPrivate;
G_DEFINE_TYPE_WITH_PRIVATE (CheeseFlash, cheese_flash, GTK_TYPE_WINDOW)
static void
cheese_flash_init (CheeseFlash *self)
{
CheeseFlashPrivate *priv = cheese_flash_get_instance_private (self);
cairo_region_t *input_region;
GtkWindow *window = GTK_WINDOW (self);
const GdkRGBA white = { 1.0, 1.0, 1.0, 1.0 };
priv->flash_timeout_tag = 0;
priv->fade_timeout_tag = 0;
priv->opacity = 1.0;
/* 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);
/* Don't take focus */
gtk_window_set_accept_focus (window, FALSE);
gtk_window_set_focus_on_map (window, FALSE);
/* Make it white */
gtk_widget_override_background_color (GTK_WIDGET (window), GTK_STATE_NORMAL,
&white);
/* 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);
}
static void
cheese_flash_class_init (CheeseFlashClass *klass)
{
}
/*
* cheese_flash_opacity_fade:
* @data: the #CheeseFlash
*
* Fade the flash out.
*
* Returns: %TRUE if the fade was completed, %FALSE if the flash must continue
* to fade
*/
static gboolean
cheese_flash_opacity_fade (gpointer data)
{
CheeseFlashPrivate *priv;
GtkWidget *flash_window;
flash_window = GTK_WIDGET (data);
priv = cheese_flash_get_instance_private (CHEESE_FLASH (data));
/* exponentially decrease */
priv->opacity *= FLASH_FADE_FACTOR;
if (priv->opacity <= FLASH_LOW_THRESHOLD)
{
/* the flasher has finished when we reach the quit value */
priv->fade_timeout_tag = 0;
gtk_widget_destroy (flash_window);
return G_SOURCE_REMOVE;
}
else
{
gtk_widget_set_opacity (flash_window, priv->opacity);
}
return G_SOURCE_CONTINUE;
}
/*
* cheese_flash_start_fade:
* @data: the #CheeseFlash
*
* Add a timeout to start the fade animation.
*
* Returns: %FALSE
*/
static gboolean
cheese_flash_start_fade (gpointer data)
{
CheeseFlashPrivate *priv = cheese_flash_get_instance_private (CHEESE_FLASH (data));
GtkWindow *flash_window = GTK_WINDOW (data);
/* If the screen is non-composited, just destroy and finish up */
if (!gdk_screen_is_composited (gtk_window_get_screen (flash_window)))
{
gtk_widget_destroy (GTK_WIDGET (flash_window));
return G_SOURCE_REMOVE;
}
priv->fade_timeout_tag = g_timeout_add (1000.0 / FLASH_ANIMATION_RATE, cheese_flash_opacity_fade, data);
priv->flash_timeout_tag = 0;
return G_SOURCE_REMOVE;
}
/**
* cheese_flash_fire:
* @flash: a #CheeseFlash
* @rect: a #GdkRectangle
*
* Fire the flash.
*/
void
cheese_flash_fire (CheeseFlash *flash,
GdkRectangle *rect)
{
CheeseFlashPrivate *priv;
GtkWindow *flash_window;
g_return_if_fail (CHEESE_IS_FLASH (flash));
g_return_if_fail (rect != NULL);
priv = cheese_flash_get_instance_private (flash);
flash_window = GTK_WINDOW (flash);
if (priv->flash_timeout_tag > 0)
{
g_source_remove (priv->flash_timeout_tag);
priv->flash_timeout_tag = 0;
}
if (priv->fade_timeout_tag > 0)
{
g_source_remove (priv->fade_timeout_tag);
priv->fade_timeout_tag = 0;
}
priv->opacity = 1.0;
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), 1);
gtk_widget_show_all (GTK_WIDGET (flash_window));
priv->flash_timeout_tag = g_timeout_add (FLASH_DURATION, cheese_flash_start_fade, (gpointer) flash);
}
/**
* cheese_flash_new:
*
* Create a new #CheeseFlash.
*
* Returns: a new #CheeseFlash
*/
CheeseFlash *
cheese_flash_new (void)
{
return g_object_new (CHEESE_TYPE_FLASH,
"type", GTK_WINDOW_POPUP,
NULL);
}
#endif
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