moving from https://github.com/perberos/mate-desktop-environment

author: Perberos <[email protected]> 2011-12-01 22:07:25 -0300
committer: Perberos <[email protected]> 2011-12-01 22:07:25 -0300
commit: d00aab12b6ace2c3dda3efbc2aaa2646d78a9099 (patch)
tree: 8b0ca776e9234f7eabf3446f12df9a81abd466d0 /libmate-desktop/mate-bg-crossfade.c
download: mate-desktop-d00aab12b6ace2c3dda3efbc2aaa2646d78a9099.tar.bz2
mate-desktop-d00aab12b6ace2c3dda3efbc2aaa2646d78a9099.tar.xz
1 files changed, 542 insertions, 0 deletions
diff --git a/libmate-desktop/mate-bg-crossfade.c b/libmate-desktop/mate-bg-crossfade.c
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+++ b/libmate-desktop/mate-bg-crossfade.c
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+/* mate-bg-crossfade.h - fade window background between two pixmaps
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Author: Ray Strode <[email protected]>
+*/
+
+#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 MATE_DESKTOP_USE_UNSTABLE_API
+#include <libmateui/mate-bg.h>
+#include "libmateui/mate-bg-crossfade.h"
+
+struct _MateBGCrossfadePrivate
+{
+ GdkWindow *window;
+ int width;
+ int height;
+ GdkPixmap *fading_pixmap;
+ GdkPixmap *end_pixmap;
+ 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 (MateBGCrossfade, mate_bg_crossfade, G_TYPE_OBJECT)
+#define MATE_BG_CROSSFADE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o),\
+ MATE_TYPE_BG_CROSSFADE,\
+ MateBGCrossfadePrivate))
+
+static void
+mate_bg_crossfade_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ MateBGCrossfade *fade;
+
+ g_assert (MATE_IS_BG_CROSSFADE (object));
+
+ fade = MATE_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
+mate_bg_crossfade_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ MateBGCrossfade *fade;
+
+ g_assert (MATE_IS_BG_CROSSFADE (object));
+
+ fade = MATE_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
+mate_bg_crossfade_finalize (GObject *object)
+{
+ MateBGCrossfade *fade;
+
+ fade = MATE_BG_CROSSFADE (object);
+
+ mate_bg_crossfade_stop (fade);
+
+ if (fade->priv->fading_pixmap != NULL) {
+ g_object_unref (fade->priv->fading_pixmap);
+ fade->priv->fading_pixmap = NULL;
+ }
+
+ if (fade->priv->end_pixmap != NULL) {
+ g_object_unref (fade->priv->end_pixmap);
+ fade->priv->end_pixmap = NULL;
+ }
+}
+
+static void
+mate_bg_crossfade_class_init (MateBGCrossfadeClass *fade_class)
+{
+ GObjectClass *gobject_class;
+
+ gobject_class = G_OBJECT_CLASS (fade_class);
+
+ gobject_class->get_property = mate_bg_crossfade_get_property;
+ gobject_class->set_property = mate_bg_crossfade_set_property;
+ gobject_class->finalize = mate_bg_crossfade_finalize;
+
+ /**
+ * MateBGCrossfade:width:
+ *
+ * When a crossfade is running, this is width of the fading
+ * pixmap.
+ */
+ 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));
+
+ /**
+ * MateBGCrossfade:height:
+ *
+ * When a crossfade is running, this is height of the fading
+ * pixmap.
+ */
+ 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));
+
+ /**
+ * MateBGCrossfade::finished:
+ * @fade: the #MateBGCrossfade that received the signal
+ * @window: the #GdkWindow the crossfade happend on.
+ *
+ * When a crossfade finishes, @window will have a copy
+ * of the end pixmap 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 (MateBGCrossfadePrivate));
+}
+
+static void
+mate_bg_crossfade_init (MateBGCrossfade *fade)
+{
+ fade->priv = MATE_BG_CROSSFADE_GET_PRIVATE (fade);
+
+ fade->priv->fading_pixmap = NULL;
+ fade->priv->end_pixmap = NULL;
+ fade->priv->timeout_id = 0;
+}
+
+/**
+ * mate_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 #GdkPixmap drawables.
+ *
+ * Return value: the new #MateBGCrossfade
+ **/
+MateBGCrossfade *
+mate_bg_crossfade_new (int width,
+ int height)
+{
+ GObject *object;
+
+ object = g_object_new (MATE_TYPE_BG_CROSSFADE,
+ "width", width,
+ "height", height, NULL);
+
+ return (MateBGCrossfade *) object;
+}
+
+static GdkPixmap *
+tile_pixmap (GdkPixmap *pixmap,
+ int width,
+ int height)
+{
+ GdkPixmap *copy;
+ cairo_t *cr;
+
+ copy = gdk_pixmap_new (pixmap, width, height, pixmap == NULL? 24 : -1);
+
+ cr = gdk_cairo_create (copy);
+
+ if (pixmap != NULL) {
+ cairo_pattern_t *pattern;
+ gdk_cairo_set_source_pixmap (cr, pixmap, 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) {
+ g_object_unref (copy);
+ copy = NULL;
+ }
+ cairo_destroy (cr);
+
+ return copy;
+}
+
+/**
+ * mate_bg_crossfade_set_start_pixmap:
+ * @fade: a #MateBGCrossfade
+ * @pixmap: The #GdkPixmap to fade from
+ *
+ * Before initiating a crossfade with mate_bg_crossfade_start()
+ * a start and end pixmap have to be set. This function sets
+ * the pixmap shown at the beginning of the crossfade effect.
+ *
+ * Return value: %TRUE if successful, or %FALSE if the pixmap
+ * could not be copied.
+ **/
+gboolean
+mate_bg_crossfade_set_start_pixmap (MateBGCrossfade *fade,
+ GdkPixmap *pixmap)
+{
+ g_return_val_if_fail (MATE_IS_BG_CROSSFADE (fade), FALSE);
+
+ if (fade->priv->fading_pixmap != NULL) {
+ g_object_unref (fade->priv->fading_pixmap);
+ fade->priv->fading_pixmap = NULL;
+ }
+
+ fade->priv->fading_pixmap = tile_pixmap (pixmap,
+ fade->priv->width,
+ fade->priv->height);
+
+ return fade->priv->fading_pixmap != 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;
+}
+
+/**
+ * mate_bg_crossfade_set_end_pixmap:
+ * @fade: a #MateBGCrossfade
+ * @pixmap: The #GdkPixmap to fade to
+ *
+ * Before initiating a crossfade with mate_bg_crossfade_start()
+ * a start and end pixmap have to be set. This function sets
+ * the pixmap shown at the end of the crossfade effect.
+ *
+ * Return value: %TRUE if successful, or %FALSE if the pixmap
+ * could not be copied.
+ **/
+gboolean
+mate_bg_crossfade_set_end_pixmap (MateBGCrossfade *fade,
+ GdkPixmap *pixmap)
+{
+ g_return_val_if_fail (MATE_IS_BG_CROSSFADE (fade), FALSE);
+
+ if (fade->priv->end_pixmap != NULL) {
+ g_object_unref (fade->priv->end_pixmap);
+ fade->priv->end_pixmap = NULL;
+ }
+
+ fade->priv->end_pixmap = tile_pixmap (pixmap,
+ 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_pixmap != NULL;
+}
+
+static gboolean
+animations_are_disabled (MateBGCrossfade *fade)
+{
+ GtkSettings *settings;
+ GdkScreen *screen;
+ gboolean are_enabled;
+
+ g_assert (fade->priv->window != NULL);
+
+ screen = gdk_drawable_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
+draw_background (MateBGCrossfade *fade)
+{
+ if (GDK_WINDOW_TYPE (fade->priv->window) == GDK_WINDOW_ROOT) {
+ GdkDisplay *display;
+ display = gdk_drawable_get_display (fade->priv->window);
+ gdk_window_clear (fade->priv->window);
+ gdk_flush ();
+ } else {
+ gdk_window_invalidate_rect (fade->priv->window, NULL, FALSE);
+ gdk_window_process_updates (fade->priv->window, FALSE);
+ }
+}
+
+static gboolean
+on_tick (MateBGCrossfade *fade)
+{
+ gdouble now, percent_done;
+ cairo_t *cr;
+ cairo_status_t status;
+
+ g_return_val_if_fail (MATE_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_pixmap == 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 = gdk_cairo_create (fade->priv->fading_pixmap);
+
+ gdk_cairo_set_source_pixmap (cr, fade->priv->end_pixmap,
+ 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 (MateBGCrossfade *fade)
+{
+ if (fade->priv->timeout_id == 0)
+ return;
+
+ g_assert (fade->priv->end_pixmap != NULL);
+
+ gdk_window_set_back_pixmap (fade->priv->window,
+ fade->priv->end_pixmap,
+ FALSE);
+ draw_background (fade);
+
+ g_object_unref (fade->priv->end_pixmap);
+ fade->priv->end_pixmap = NULL;
+
+ g_assert (fade->priv->fading_pixmap != NULL);
+
+ g_object_unref (fade->priv->fading_pixmap);
+ fade->priv->fading_pixmap = NULL;
+
+ fade->priv->timeout_id = 0;
+ g_signal_emit (fade, signals[FINISHED], 0, fade->priv->window);
+}
+
+/**
+ * mate_bg_crossfade_start:
+ * @fade: a #MateBGCrossfade
+ * @window: The #GdkWindow to draw crossfade on
+ *
+ * This function initiates a quick crossfade between two pixmaps on
+ * the background of @window. Before initiating the crossfade both
+ * mate_bg_crossfade_start() and mate_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 pixmap.
+ **/
+void
+mate_bg_crossfade_start (MateBGCrossfade *fade,
+ GdkWindow *window)
+{
+ GSource *source;
+ GMainContext *context;
+
+ g_return_if_fail (MATE_IS_BG_CROSSFADE (fade));
+ g_return_if_fail (window != NULL);
+ g_return_if_fail (fade->priv->fading_pixmap != NULL);
+ g_return_if_fail (fade->priv->end_pixmap != NULL);
+ g_return_if_fail (!mate_bg_crossfade_is_started (fade));
+ g_return_if_fail (GDK_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;
+ gdk_window_set_back_pixmap (fade->priv->window,
+ fade->priv->fading_pixmap,
+ FALSE);
+ draw_background (fade);
+
+ fade->priv->is_first_frame = TRUE;
+ fade->priv->total_duration = .75;
+ fade->priv->start_time = get_current_time ();
+}
+
+
+/**
+ * mate_bg_crossfade_is_started:
+ * @fade: a #MateBGCrossfade
+ *
+ * This function reveals whether or not @fade is currently
+ * running on a window. See mate_bg_crossfade_start() for
+ * information on how to initiate a crossfade.
+ *
+ * Return value: %TRUE if fading, or %FALSE if not fading
+ **/
+gboolean
+mate_bg_crossfade_is_started (MateBGCrossfade *fade)
+{
+ g_return_val_if_fail (MATE_IS_BG_CROSSFADE (fade), FALSE);
+
+ return fade->priv->timeout_id != 0;
+}
+
+/**
+ * mate_bg_crossfade_stop:
+ * @fade: a #MateBGCrossfade
+ *
+ * This function stops any in progress crossfades that may be
+ * happening. It's harmless to call this function if @fade is
+ * already stopped.
+ **/
+void
+mate_bg_crossfade_stop (MateBGCrossfade *fade)
+{
+ g_return_if_fail (MATE_IS_BG_CROSSFADE (fade));
+
+ if (!mate_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;
+}
author	Perberos <[email protected]>	2011-12-01 22:07:25 -0300
committer	Perberos <[email protected]>	2011-12-01 22:07:25 -0300
commit	d00aab12b6ace2c3dda3efbc2aaa2646d78a9099 (patch)
tree	8b0ca776e9234f7eabf3446f12df9a81abd466d0 /libmate-desktop/mate-bg-crossfade.c
download	mate-desktop-d00aab12b6ace2c3dda3efbc2aaa2646d78a9099.tar.bz2 mate-desktop-d00aab12b6ace2c3dda3efbc2aaa2646d78a9099.tar.xz