diff options
Diffstat (limited to 'libgnome-desktop/gnome-bg-crossfade.c')
| -rw-r--r-- | libgnome-desktop/gnome-bg-crossfade.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/libgnome-desktop/gnome-bg-crossfade.c b/libgnome-desktop/gnome-bg-crossfade.c deleted file mode 100644 index 2c112d0a..00000000 --- a/libgnome-desktop/gnome-bg-crossfade.c +++ /dev/null @@ -1,575 +0,0 @@ -/* gnome-bg-crossfade.h - fade window background between two surfaces - * - * Copyright (C) 2008 Red Hat, Inc. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library 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 - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * Author: Ray Strode <rstrode@redhat.com> -*/ - -#include <string.h> -#include <math.h> -#include <stdarg.h> - -#include <gio/gio.h> - -#include <gdk/gdk.h> -#include <gdk/gdkx.h> -#include <X11/Xlib.h> -#include <X11/Xatom.h> -#include <gtk/gtk.h> - -#include <cairo.h> -#include <cairo-xlib.h> - -#define GNOME_DESKTOP_USE_UNSTABLE_API -#include "gnome-bg.h" -#include "gnome-bg-crossfade.h" - -struct _GnomeBGCrossfadePrivate -{ - GdkWindow *window; - int width; - int height; - cairo_surface_t *fading_surface; - cairo_surface_t *end_surface; - gdouble start_time; - gdouble total_duration; - guint timeout_id; - guint is_first_frame : 1; -}; - -enum { - PROP_0, - PROP_WIDTH, - PROP_HEIGHT, -}; - -enum { - FINISHED, - NUMBER_OF_SIGNALS -}; - -static guint signals[NUMBER_OF_SIGNALS] = { 0 }; - -G_DEFINE_TYPE (GnomeBGCrossfade, gnome_bg_crossfade, G_TYPE_OBJECT) -#define GNOME_BG_CROSSFADE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o),\ - GNOME_TYPE_BG_CROSSFADE,\ - GnomeBGCrossfadePrivate)) - -static void -gnome_bg_crossfade_set_property (GObject *object, - guint property_id, - const GValue *value, - GParamSpec *pspec) -{ - GnomeBGCrossfade *fade; - - g_assert (GNOME_IS_BG_CROSSFADE (object)); - - fade = GNOME_BG_CROSSFADE (object); - - switch (property_id) - { - case PROP_WIDTH: - fade->priv->width = g_value_get_int (value); - break; - case PROP_HEIGHT: - fade->priv->height = g_value_get_int (value); - break; - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); - break; - } -} - -static void -gnome_bg_crossfade_get_property (GObject *object, - guint property_id, - GValue *value, - GParamSpec *pspec) -{ - GnomeBGCrossfade *fade; - - g_assert (GNOME_IS_BG_CROSSFADE (object)); - - fade = GNOME_BG_CROSSFADE (object); - - switch (property_id) - { - case PROP_WIDTH: - g_value_set_int (value, fade->priv->width); - break; - case PROP_HEIGHT: - g_value_set_int (value, fade->priv->height); - break; - - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); - break; - } -} - -static void -gnome_bg_crossfade_finalize (GObject *object) -{ - GnomeBGCrossfade *fade; - - fade = GNOME_BG_CROSSFADE (object); - - gnome_bg_crossfade_stop (fade); - - if (fade->priv->fading_surface != NULL) { - cairo_surface_destroy (fade->priv->fading_surface); - fade->priv->fading_surface = NULL; - } - - if (fade->priv->end_surface != NULL) { - g_object_unref (fade->priv->end_surface); - fade->priv->end_surface = NULL; - } -} - -static void -gnome_bg_crossfade_class_init (GnomeBGCrossfadeClass *fade_class) -{ - GObjectClass *gobject_class; - - gobject_class = G_OBJECT_CLASS (fade_class); - - gobject_class->get_property = gnome_bg_crossfade_get_property; - gobject_class->set_property = gnome_bg_crossfade_set_property; - gobject_class->finalize = gnome_bg_crossfade_finalize; - - /** - * GnomeBGCrossfade:width: - * - * When a crossfade is running, this is width of the fading - * surface. - */ - g_object_class_install_property (gobject_class, - PROP_WIDTH, - g_param_spec_int ("width", - "Window Width", - "Width of window to fade", - 0, G_MAXINT, 0, - G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE)); - - /** - * GnomeBGCrossfade:height: - * - * When a crossfade is running, this is height of the fading - * surface. - */ - g_object_class_install_property (gobject_class, - PROP_HEIGHT, - g_param_spec_int ("height", "Window Height", - "Height of window to fade on", - 0, G_MAXINT, 0, - G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE)); - - /** - * GnomeBGCrossfade::finished: - * @fade: the #GnomeBGCrossfade that received the signal - * @window: the #GdkWindow the crossfade happend on. - * - * When a crossfade finishes, @window will have a copy - * of the end surface as its background, and this signal will - * get emitted. - */ - signals[FINISHED] = g_signal_new ("finished", - G_OBJECT_CLASS_TYPE (gobject_class), - G_SIGNAL_RUN_LAST, 0, NULL, NULL, - g_cclosure_marshal_VOID__OBJECT, - G_TYPE_NONE, 1, G_TYPE_OBJECT); - - g_type_class_add_private (gobject_class, sizeof (GnomeBGCrossfadePrivate)); -} - -static void -gnome_bg_crossfade_init (GnomeBGCrossfade *fade) -{ - fade->priv = GNOME_BG_CROSSFADE_GET_PRIVATE (fade); - - fade->priv->fading_surface = NULL; - fade->priv->end_surface = NULL; - fade->priv->timeout_id = 0; -} - -/** - * gnome_bg_crossfade_new: - * @width: The width of the crossfading window - * @height: The height of the crossfading window - * - * Creates a new object to manage crossfading a - * window background between two #cairo_surface_ts. - * - * Return value: the new #GnomeBGCrossfade - **/ -GnomeBGCrossfade * -gnome_bg_crossfade_new (int width, - int height) -{ - GObject *object; - - object = g_object_new (GNOME_TYPE_BG_CROSSFADE, - "width", width, - "height", height, NULL); - - return (GnomeBGCrossfade *) object; -} - -static cairo_surface_t * -tile_surface (cairo_surface_t *surface, - int width, - int height) -{ - cairo_surface_t *copy; - cairo_t *cr; - - if (surface == NULL) { - copy = gdk_window_create_similar_surface (gdk_get_default_root_window (), - CAIRO_CONTENT_COLOR, - width, height); - } else { - copy = cairo_surface_create_similar (surface, - cairo_surface_get_content (surface), - width, height); - } - - cr = cairo_create (copy); - - if (surface != NULL) { - cairo_pattern_t *pattern; - cairo_set_source_surface (cr, surface, 0.0, 0.0); - pattern = cairo_get_source (cr); - cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT); - } else { - GtkStyle *style; - style = gtk_widget_get_default_style (); - gdk_cairo_set_source_color (cr, &style->bg[GTK_STATE_NORMAL]); - } - - cairo_paint (cr); - - if (cairo_status (cr) != CAIRO_STATUS_SUCCESS) { - cairo_surface_destroy (copy); - copy = NULL; - } - cairo_destroy (cr); - - return copy; -} - -/** - * gnome_bg_crossfade_set_start_surface: - * @fade: a #GnomeBGCrossfade - * @surface: The cairo surface to fade from - * - * Before initiating a crossfade with gnome_bg_crossfade_start() - * a start and end surface have to be set. This function sets - * the surface shown at the beginning of the crossfade effect. - * - * Return value: %TRUE if successful, or %FALSE if the surface - * could not be copied. - **/ -gboolean -gnome_bg_crossfade_set_start_surface (GnomeBGCrossfade *fade, - cairo_surface_t *surface) -{ - g_return_val_if_fail (GNOME_IS_BG_CROSSFADE (fade), FALSE); - - if (fade->priv->fading_surface != NULL) { - cairo_surface_destroy (fade->priv->fading_surface); - fade->priv->fading_surface = NULL; - } - - fade->priv->fading_surface = tile_surface (surface, - fade->priv->width, - fade->priv->height); - - return fade->priv->fading_surface != NULL; -} - -static gdouble -get_current_time (void) -{ - const double microseconds_per_second = (double) G_USEC_PER_SEC; - double timestamp; - GTimeVal now; - - g_get_current_time (&now); - - timestamp = ((microseconds_per_second * now.tv_sec) + now.tv_usec) / - microseconds_per_second; - - return timestamp; -} - -/** - * gnome_bg_crossfade_set_end_surface: - * @fade: a #GnomeBGCrossfade - * @surface: The cairo surface to fade to - * - * Before initiating a crossfade with gnome_bg_crossfade_start() - * a start and end surface have to be set. This function sets - * the surface shown at the end of the crossfade effect. - * - * Return value: %TRUE if successful, or %FALSE if the surface - * could not be copied. - **/ -gboolean -gnome_bg_crossfade_set_end_surface (GnomeBGCrossfade *fade, - cairo_surface_t *surface) -{ - g_return_val_if_fail (GNOME_IS_BG_CROSSFADE (fade), FALSE); - - if (fade->priv->end_surface != NULL) { - cairo_surface_destroy (fade->priv->end_surface); - fade->priv->end_surface = NULL; - } - - fade->priv->end_surface = tile_surface (surface, - fade->priv->width, - fade->priv->height); - - /* Reset timer in case we're called while animating - */ - fade->priv->start_time = get_current_time (); - return fade->priv->end_surface != NULL; -} - -static gboolean -animations_are_disabled (GnomeBGCrossfade *fade) -{ - GtkSettings *settings; - GdkScreen *screen; - gboolean are_enabled; - - g_assert (fade->priv->window != NULL); - - screen = gdk_window_get_screen (fade->priv->window); - - settings = gtk_settings_get_for_screen (screen); - - g_object_get (settings, "gtk-enable-animations", &are_enabled, NULL); - - return !are_enabled; -} - -static void -send_root_property_change_notification (GnomeBGCrossfade *fade) -{ - long zero_length_pixmap; - - /* We do a zero length append to force a change notification, - * without changing the value */ - XChangeProperty (GDK_WINDOW_XDISPLAY (fade->priv->window), - GDK_WINDOW_XID (fade->priv->window), - gdk_x11_get_xatom_by_name ("_XROOTPMAP_ID"), - XA_PIXMAP, 32, PropModeAppend, - (guchar *) &zero_length_pixmap, 0); -} - -static void -draw_background (GnomeBGCrossfade *fade) -{ - if (gdk_window_get_window_type (fade->priv->window) == GDK_WINDOW_ROOT) { - XClearArea (GDK_WINDOW_XDISPLAY (fade->priv->window), - GDK_WINDOW_XID (fade->priv->window), - 0, 0, - gdk_window_get_width (fade->priv->window), - gdk_window_get_height (fade->priv->window), - False); - - send_root_property_change_notification (fade); - - gdk_flush (); - } else { - gdk_window_invalidate_rect (fade->priv->window, NULL, FALSE); - gdk_window_process_updates (fade->priv->window, FALSE); - } -} - -static gboolean -on_tick (GnomeBGCrossfade *fade) -{ - gdouble now, percent_done; - cairo_t *cr; - cairo_status_t status; - - g_return_val_if_fail (GNOME_IS_BG_CROSSFADE (fade), FALSE); - - now = get_current_time (); - - percent_done = (now - fade->priv->start_time) / fade->priv->total_duration; - percent_done = CLAMP (percent_done, 0.0, 1.0); - - /* If it's taking a long time to get to the first frame, - * then lengthen the duration, so the user will get to see - * the effect. - */ - if (fade->priv->is_first_frame && percent_done > .33) { - fade->priv->is_first_frame = FALSE; - fade->priv->total_duration *= 1.5; - return on_tick (fade); - } - - if (fade->priv->fading_surface == NULL) { - return FALSE; - } - - if (animations_are_disabled (fade)) { - return FALSE; - } - - /* We accumulate the results in place for performance reasons. - * - * This means 1) The fade is exponential, not linear (looks good!) - * 2) The rate of fade is not independent of frame rate. Slower machines - * will get a slower fade (but never longer than .75 seconds), and - * even the fastest machines will get *some* fade because the framerate - * is capped. - */ - cr = cairo_create (fade->priv->fading_surface); - - cairo_set_source_surface (cr, fade->priv->end_surface, - 0.0, 0.0); - cairo_paint_with_alpha (cr, percent_done); - - status = cairo_status (cr); - cairo_destroy (cr); - - if (status == CAIRO_STATUS_SUCCESS) { - draw_background (fade); - } - return percent_done <= .99; -} - -static void -on_finished (GnomeBGCrossfade *fade) -{ - cairo_pattern_t *pattern; - - if (fade->priv->timeout_id == 0) - return; - - g_assert (fade->priv->end_surface != NULL); - - pattern = cairo_pattern_create_for_surface (fade->priv->end_surface); - gdk_window_set_background_pattern (fade->priv->window, pattern); - cairo_pattern_destroy (pattern); - - draw_background (fade); - - cairo_surface_destroy (fade->priv->end_surface); - fade->priv->end_surface = NULL; - - g_assert (fade->priv->fading_surface != NULL); - - cairo_surface_destroy (fade->priv->fading_surface); - fade->priv->fading_surface = NULL; - - fade->priv->timeout_id = 0; - g_signal_emit (fade, signals[FINISHED], 0, fade->priv->window); -} - -/** - * gnome_bg_crossfade_start: - * @fade: a #GnomeBGCrossfade - * @window: The #GdkWindow to draw crossfade on - * - * This function initiates a quick crossfade between two surfaces on - * the background of @window. Before initiating the crossfade both - * gnome_bg_crossfade_start() and gnome_bg_crossfade_end() need to - * be called. If animations are disabled, the crossfade is skipped, - * and the window background is set immediately to the end surface. - **/ -void -gnome_bg_crossfade_start (GnomeBGCrossfade *fade, - GdkWindow *window) -{ - GSource *source; - GMainContext *context; - cairo_pattern_t *pattern; - - g_return_if_fail (GNOME_IS_BG_CROSSFADE (fade)); - g_return_if_fail (window != NULL); - g_return_if_fail (fade->priv->fading_surface != NULL); - g_return_if_fail (fade->priv->end_surface != NULL); - g_return_if_fail (!gnome_bg_crossfade_is_started (fade)); - g_return_if_fail (gdk_window_get_window_type (window) != GDK_WINDOW_FOREIGN); - - source = g_timeout_source_new (1000 / 60.0); - g_source_set_callback (source, - (GSourceFunc) on_tick, - fade, - (GDestroyNotify) on_finished); - context = g_main_context_default (); - fade->priv->timeout_id = g_source_attach (source, context); - g_source_unref (source); - - fade->priv->window = window; - pattern = cairo_pattern_create_for_surface (fade->priv->fading_surface); - gdk_window_set_background_pattern (fade->priv->window, pattern); - cairo_pattern_destroy (pattern); - - draw_background (fade); - - fade->priv->is_first_frame = TRUE; - fade->priv->total_duration = .75; - fade->priv->start_time = get_current_time (); -} - - -/** - * gnome_bg_crossfade_is_started: - * @fade: a #GnomeBGCrossfade - * - * This function reveals whether or not @fade is currently - * running on a window. See gnome_bg_crossfade_start() for - * information on how to initiate a crossfade. - * - * Return value: %TRUE if fading, or %FALSE if not fading - **/ -gboolean -gnome_bg_crossfade_is_started (GnomeBGCrossfade *fade) -{ - g_return_val_if_fail (GNOME_IS_BG_CROSSFADE (fade), FALSE); - - return fade->priv->timeout_id != 0; -} - -/** - * gnome_bg_crossfade_stop: - * @fade: a #GnomeBGCrossfade - * - * This function stops any in progress crossfades that may be - * happening. It's harmless to call this function if @fade is - * already stopped. - **/ -void -gnome_bg_crossfade_stop (GnomeBGCrossfade *fade) -{ - g_return_if_fail (GNOME_IS_BG_CROSSFADE (fade)); - - if (!gnome_bg_crossfade_is_started (fade)) - return; - - g_assert (fade->priv->timeout_id != 0); - g_source_remove (fade->priv->timeout_id); - fade->priv->timeout_id = 0; -} |