first commit

1 files changed, 1256 insertions, 0 deletions

diff --git a/savers/floaters.c.orig b/savers/floaters.c.orig
new file mode 100644
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--- /dev/null
+++ b/savers/floaters.c.orig
@@ -0,0 +1,1256 @@
+/*
+ * Copyright (C) 2005 Ray Strode <[email protected]>,
+ *                    Matthias Clasen <[email protected]>,
+ *                    Søren Sandmann <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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.
+ *
+ * Originally written by: Ray Strode <[email protected]>
+ *
+ * Later contributions by: Matthias Clasen <[email protected]>
+ *                         Søren Sandmann <[email protected]>
+ */
+
+#include "config.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <time.h>
+
+#include <glib.h>
+#include <glib/gi18n.h>
+
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+
+#include <gtk/gtk.h>
+
+#include "gs-theme-window.h"
+
+#ifndef trunc
+#define trunc(x) (((x) > 0.0) ? floor((x)) : -floor(-(x)))
+#endif
+
+#ifndef OPTIMAL_FRAME_RATE
+#define OPTIMAL_FRAME_RATE (25.0)
+#endif
+
+#ifndef STAT_PRINT_FREQUENCY
+#define STAT_PRINT_FREQUENCY (2000)
+#endif
+
+#ifndef FLOATER_MAX_SIZE
+#define FLOATER_MAX_SIZE (128.0)
+#endif
+
+#ifndef FLOATER_MIN_SIZE
+#define FLOATER_MIN_SIZE (16.0)
+#endif
+#ifndef FLOATER_DEFAULT_COUNT
+#define FLOATER_DEFAULT_COUNT (5)
+#endif
+
+#ifndef SMALL_ANGLE
+#define SMALL_ANGLE (0.025 * G_PI)
+#endif
+
+#ifndef BIG_ANGLE
+#define BIG_ANGLE (0.125 * G_PI)
+#endif
+
+#ifndef GAMMA
+#define GAMMA 2.2
+#endif
+
+static gboolean should_show_paths = FALSE;
+static gboolean should_do_rotations = FALSE;
+static gboolean should_print_stats = FALSE;
+static gint max_floater_count = FLOATER_DEFAULT_COUNT;
+static gchar *geometry = NULL;
+static gchar **filenames = NULL;
+
+static GOptionEntry options[] = {
+       {"show-paths", 'p', 0, G_OPTION_ARG_NONE, &should_show_paths,
+            N_("Show paths that images follow"), NULL},
+
+       {"do-rotations", 'r', 0, G_OPTION_ARG_NONE, &should_do_rotations,
+            N_("Occasionally rotate images as they move"), NULL},
+
+       {"print-stats", 's', 0, G_OPTION_ARG_NONE, &should_print_stats,
+            N_("Print out frame rate and other statistics"), NULL},
+
+       {"number-of-images", 'n', 0, G_OPTION_ARG_INT, &max_floater_count,
+             N_("The maximum number of images to keep on screen"), N_("MAX_IMAGES")},
+
+       {"geometry", 0, 0, G_OPTION_ARG_STRING, &geometry,
+             N_("The initial size and position of window"), N_("WIDTHxHEIGHT+X+Y")},
+
+       {G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &filenames,
+            N_("The source image to use"), NULL},
+
+       {NULL}
+};
+
+
+typedef struct _Point Point;
+typedef struct _Path Path;
+typedef struct _Rectangle Rectangle;
+typedef struct _ScreenSaverFloater ScreenSaverFloater;
+typedef struct _CachedSource CachedSource;
+typedef struct _ScreenSaver ScreenSaver;
+
+struct _Point
+{
+  gdouble x, y;
+};
+
+struct _Path
+{
+  Point start_point;
+  Point start_control_point;
+  Point end_control_point;
+  Point end_point;
+
+  gdouble x_linear_coefficient,
+          y_linear_coefficient;
+
+  gdouble x_quadratic_coefficient,
+          y_quadratic_coefficient;
+
+  gdouble x_cubic_coefficient,
+          y_cubic_coefficient;
+
+  gdouble duration;
+};
+
+struct _CachedSource
+{
+  cairo_pattern_t *pattern;
+  gint width, height;
+};
+
+struct _Rectangle
+{
+  Point top_left_point;
+  Point bottom_right_point;
+};
+
+struct _ScreenSaverFloater
+{
+  GdkRectangle bounds;
+
+  Point start_position;
+  Point position;
+
+  gdouble scale;
+  gdouble opacity;
+
+  Path *path;
+  gdouble path_start_time;
+  gdouble path_start_scale;
+  gdouble path_end_scale;
+
+  gdouble angle;
+  gdouble angle_increment;
+};
+
+struct _ScreenSaver
+{
+  GtkWidget  *drawing_area;
+  Rectangle canvas_rectangle;
+  GHashTable *cached_sources;
+
+  char *filename;
+
+  gdouble first_update_time;
+
+  gdouble last_calculated_stats_time,
+          current_calculated_stats_time;
+  gint update_count, frame_count;
+
+  gdouble updates_per_second;
+  gdouble frames_per_second;
+
+  guint state_update_timeout_id;
+  guint stats_update_timeout_id;
+
+  GList *floaters;
+  gint max_floater_count;
+
+  guint should_do_rotations: 1;
+  guint should_show_paths : 1;
+  guint draw_ops_pending : 1;
+};
+
+static Path *path_new (Point *start_point,
+                       Point *start_control_point,
+                       Point *end_control_point,
+                       Point *end_point,
+                       gdouble duration);
+static void path_free (Path *path);
+
+static ScreenSaverFloater *screen_saver_floater_new (ScreenSaver *screen_saver,
+                                                     Point       *position,
+                                                     gdouble      scale);
+static void screen_saver_floater_free (ScreenSaver        *screen_saver,
+                                       ScreenSaverFloater *floater);
+static gboolean screen_saver_floater_is_off_canvas (ScreenSaver        *screen_saver,
+                                                    ScreenSaverFloater *floater);
+static gboolean screen_saver_floater_should_bubble_up (ScreenSaver        *screen_saver,
+                                                       ScreenSaverFloater *floater,
+                                                       gdouble             performance_ratio,
+                                                       gdouble            *duration);
+static gboolean screen_saver_floater_should_come_on_screen (ScreenSaver   *screen_saver,
+                                                            ScreenSaverFloater *floater,
+                                                            gdouble             performance_ratio,
+                                                            gdouble            *duration);
+static Point screen_saver_floater_get_position_from_time (ScreenSaver        *screen_saver,
+                                                          ScreenSaverFloater *floater,
+                                                          gdouble             time);
+static gdouble screen_saver_floater_get_scale_from_time (ScreenSaver        *screen_saver,
+                                                         ScreenSaverFloater *floater,
+                                                         gdouble             time);
+static gdouble screen_saver_floater_get_angle_from_time (ScreenSaver        *screen_saver,
+                                                         ScreenSaverFloater *floater,
+                                                         gdouble             time);
+
+static Path *screen_saver_floater_create_path_to_on_screen (ScreenSaver        *screen_saver,
+                                                            ScreenSaverFloater *floater,
+                                                            gdouble             duration);
+static Path *screen_saver_floater_create_path_to_bubble_up (ScreenSaver        *screen_saver,
+                                                            ScreenSaverFloater *floater,
+                                                            gdouble             duration);
+static Path *screen_saver_floater_create_path_to_random_point (ScreenSaver        *screen_saver,
+                                                               ScreenSaverFloater *floater,
+                                                               gdouble             duration);
+static Path *screen_saver_floater_create_path (ScreenSaver        *screen_saver,
+                                               ScreenSaverFloater *floater);
+static void screen_saver_floater_update_state (ScreenSaver        *screen_saver,
+                                               ScreenSaverFloater *floater,
+                                               gdouble             time);
+
+static gboolean screen_saver_floater_do_draw (ScreenSaver        *screen_saver,
+                                              ScreenSaverFloater *floater,
+                                              cairo_t            *context);
+
+static CachedSource *cached_source_new (cairo_pattern_t *pattern,
+                                        gint             width,
+                                        gint             height);
+static void cached_source_free (CachedSource *source);
+
+static ScreenSaver *screen_saver_new (GtkDrawingArea  *drawing_area,
+                                      const gchar     *filename,
+                                      gint             max_floater_count,
+                                      gboolean         should_do_rotations,
+                                      gboolean         should_show_paths);
+static void screen_saver_free (ScreenSaver *screen_saver);
+static gdouble screen_saver_get_timestamp (ScreenSaver *screen_saver);
+static void screen_saver_get_initial_state (ScreenSaver *screen_saver);
+static void screen_saver_update_state (ScreenSaver *screen_saver,
+                                       gdouble      time);
+static gboolean screen_saver_do_update_state (ScreenSaver *screen_saver);
+static gboolean screen_saver_do_update_stats (ScreenSaver *screen_saver);
+static gdouble screen_saver_get_updates_per_second (ScreenSaver *screen_saver);
+static gdouble screen_saver_get_frames_per_second (ScreenSaver *screen_saver);
+static gdouble screen_saver_get_image_cache_usage (ScreenSaver *screen_saver);
+static void screen_saver_create_floaters (ScreenSaver *screen_saver);
+static void screen_saver_destroy_floaters (ScreenSaver *screen_saver);
+static void screen_saver_on_size_allocate (ScreenSaver   *screen_saver,
+                                           GtkAllocation *allocation);
+static void screen_saver_on_expose_event (ScreenSaver    *screen_saver,
+                                          GdkEventExpose *event);
+static gboolean do_print_screen_saver_stats (ScreenSaver *screen_saver);
+static GdkPixbuf *gamma_correct (const GdkPixbuf *input_pixbuf);
+
+static CachedSource*
+cached_source_new (cairo_pattern_t *pattern,
+                   gint              width,
+                   gint             height)
+{
+  CachedSource *source;
+
+  source = g_new (CachedSource, 1);
+  source->pattern = cairo_pattern_reference (pattern);
+  source->width = width;
+  source->height = height;
+
+  return source;
+}
+
+static void
+cached_source_free (CachedSource *source)
+{
+  if (source == NULL)
+    return;
+
+  cairo_pattern_destroy (source->pattern);
+
+  g_free (source);
+}
+
+static Path *
+path_new (Point *start_point,
+          Point *start_control_point,
+          Point *end_control_point,
+          Point *end_point,
+          gdouble duration)
+{
+  Path *path;
+
+  path = g_new (Path, 1);
+  path->start_point = *start_point;
+  path->start_control_point = *start_control_point;
+  path->end_control_point = *end_control_point;
+  path->end_point = *end_point;
+  path->duration = duration;
+
+  /* we precompute the coefficients to the cubic bezier curve here
+   * so that we don't have to do it repeatedly later The equation is:
+   *
+   * B(t) = A * t^3 + B * t^2 + C * t + start_point
+   */
+  path->x_linear_coefficient = 3 * (start_control_point->x - start_point->x);
+  path->x_quadratic_coefficient = 3 * (end_control_point->x -
+                                       start_control_point->x) -
+                                  path->x_linear_coefficient;
+  path->x_cubic_coefficient = end_point->x - start_point->x -
+                              path->x_linear_coefficient -
+                              path->x_quadratic_coefficient;
+
+  path->y_linear_coefficient = 3 * (start_control_point->y - start_point->y);
+  path->y_quadratic_coefficient = 3 * (end_control_point->y -
+                                       start_control_point->y) -
+                                  path->y_linear_coefficient;
+  path->y_cubic_coefficient = end_point->y - start_point->y -
+                              path->y_linear_coefficient -
+                              path->y_quadratic_coefficient;
+  return path;
+}
+
+static void
+path_free (Path *path)
+{
+  g_free (path);
+}
+
+static ScreenSaverFloater*
+screen_saver_floater_new (ScreenSaver *screen_saver,
+                          Point       *position,
+                          gdouble      scale)
+{
+  ScreenSaverFloater *floater;
+
+  floater = g_new (ScreenSaverFloater, 1);
+  floater->bounds.width = 0;
+  floater->start_position = *position;
+  floater->position = *position;
+  floater->scale = scale;
+  floater->opacity = pow (scale, 1.0 / GAMMA);
+  floater->path = NULL;
+  floater->path_start_time = 0.0;
+  floater->path_start_scale = 1.0;
+  floater->path_end_scale = 0.0;
+
+  floater->angle = 0.0;
+  floater->angle_increment = 0.0;
+
+  return floater;
+}
+
+void
+screen_saver_floater_free (ScreenSaver        *screen_saver,
+                           ScreenSaverFloater *floater)
+{
+  if (floater == NULL)
+    return;
+
+  path_free (floater->path);
+
+  g_free (floater);
+}
+
+static gboolean
+screen_saver_floater_is_off_canvas (ScreenSaver        *screen_saver,
+                                    ScreenSaverFloater *floater)
+{
+  if ((floater->position.x < screen_saver->canvas_rectangle.top_left_point.x) ||
+      (floater->position.x > screen_saver->canvas_rectangle.bottom_right_point.x) ||
+      (floater->position.y < screen_saver->canvas_rectangle.top_left_point.y) ||
+      (floater->position.y > screen_saver->canvas_rectangle.bottom_right_point.y))
+    return TRUE;
+
+  return FALSE;
+}
+
+static gboolean
+screen_saver_floater_should_come_on_screen (ScreenSaver        *screen_saver,
+                                            ScreenSaverFloater *floater,
+                                            gdouble             performance_ratio,
+                                            gdouble            *duration)
+{
+
+  if (!screen_saver_floater_is_off_canvas (screen_saver, floater))
+    return FALSE;
+
+  if ((abs (performance_ratio - .5) >= G_MINDOUBLE) &&
+      (g_random_double () > .5))
+    {
+      if (duration)
+        *duration = g_random_double_range (3.0, 7.0);
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static gboolean
+screen_saver_floater_should_bubble_up (ScreenSaver        *screen_saver,
+                                       ScreenSaverFloater *floater,
+                                       gdouble             performance_ratio,
+                                       gdouble            *duration)
+{
+
+  if ((performance_ratio < .5) && (g_random_double () > .5))
+    {
+      if (duration)
+        *duration = performance_ratio * 30.0;
+
+      return TRUE;
+    }
+
+  if ((floater->scale < .3) && (g_random_double () > .6))
+    {
+      if (duration)
+        *duration = 30.0;
+
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static Point
+screen_saver_floater_get_position_from_time (ScreenSaver        *screen_saver,
+                                             ScreenSaverFloater *floater,
+                                             gdouble             time)
+{
+  Point point;
+
+  time = time / floater->path->duration;
+
+  point.x = floater->path->x_cubic_coefficient * (time * time * time) +
+            floater->path->x_quadratic_coefficient * (time * time) +
+            floater->path->x_linear_coefficient * (time) +
+            floater->path->start_point.x;
+  point.y = floater->path->y_cubic_coefficient * (time * time * time) +
+            floater->path->y_quadratic_coefficient * (time * time) +
+            floater->path->y_linear_coefficient * (time) +
+            floater->path->start_point.y;
+
+  return point;
+}
+
+static gdouble
+screen_saver_floater_get_scale_from_time (ScreenSaver        *screen_saver,
+                                          ScreenSaverFloater *floater,
+                                          gdouble             time)
+{
+  gdouble completion_ratio, total_scale_growth, new_scale;
+
+  completion_ratio = time / floater->path->duration;
+  total_scale_growth = (floater->path_end_scale - floater->path_start_scale);
+  new_scale = floater->path_start_scale + total_scale_growth * completion_ratio;
+
+  return CLAMP (new_scale, 0.0, 1.0);
+}
+
+static gdouble
+screen_saver_floater_get_angle_from_time (ScreenSaver        *screen_saver,
+                                          ScreenSaverFloater *floater,
+                                          gdouble             time)
+{
+  gdouble completion_ratio;
+  gdouble total_rotation;
+
+  completion_ratio = time / floater->path->duration;
+  total_rotation = floater->angle_increment * floater->path->duration;
+
+  return floater->angle + total_rotation * completion_ratio;
+}
+
+static Path *
+screen_saver_floater_create_path_to_on_screen (ScreenSaver        *screen_saver,
+                                               ScreenSaverFloater *floater,
+                                               gdouble             duration)
+{
+  Point start_position, end_position, start_control_point, end_control_point;
+  start_position = floater->position;
+
+  end_position.x = g_random_double_range (.25, .75) *
+      (screen_saver->canvas_rectangle.top_left_point.x +
+       screen_saver->canvas_rectangle.bottom_right_point.x);
+  end_position.y = g_random_double_range (.25, .75) *
+      (screen_saver->canvas_rectangle.top_left_point.y +
+       screen_saver->canvas_rectangle.bottom_right_point.y);
+
+  start_control_point.x = start_position.x + .9 * (end_position.x - start_position.x);
+  start_control_point.y = start_position.y + .9 * (end_position.y - start_position.y);
+
+  end_control_point.x = start_position.x + 1.0 * (end_position.x - start_position.x);
+  end_control_point.y = start_position.y + 1.0 * (end_position.y - start_position.y);
+
+  return path_new (&start_position, &start_control_point, &end_control_point,
+                   &end_position, duration);
+}
+
+static Path *
+screen_saver_floater_create_path_to_bubble_up (ScreenSaver        *screen_saver,
+                                               ScreenSaverFloater *floater,
+                                               gdouble             duration)
+{
+  Point start_position, end_position, start_control_point, end_control_point;
+
+  start_position = floater->position;
+  end_position.x = start_position.x;
+  end_position.y = screen_saver->canvas_rectangle.top_left_point.y - FLOATER_MAX_SIZE;
+  start_control_point.x = .5 * start_position.x;
+  start_control_point.y = .5 * start_position.y;
+  end_control_point.x = 1.5 * end_position.x;
+  end_control_point.y = .5 * end_position.y;
+
+  return path_new (&start_position, &start_control_point, &end_control_point,
+                   &end_position, duration);
+}
+
+static Path *
+screen_saver_floater_create_path_to_random_point (ScreenSaver        *screen_saver,
+                                                  ScreenSaverFloater *floater,
+                                                  gdouble             duration)
+{
+  Point start_position, end_position, start_control_point, end_control_point;
+
+  start_position = floater->position;
+
+  end_position.x = start_position.x +
+      (g_random_double_range (-.5, .5) * 4 * FLOATER_MAX_SIZE);
+  end_position.y = start_position.y +
+      (g_random_double_range (-.5, .5) * 4 * FLOATER_MAX_SIZE);
+
+  start_control_point.x = start_position.x + .95 * (end_position.x - start_position.x);
+  start_control_point.y = start_position.y + .95 * (end_position.y - start_position.y);
+
+  end_control_point.x = start_position.x + 1.0 * (end_position.x - start_position.x);
+  end_control_point.y = start_position.y + 1.0 * (end_position.y - start_position.y);
+
+  return path_new (&start_position, &start_control_point, &end_control_point,
+                   &end_position, duration);
+}
+
+static Path *
+screen_saver_floater_create_path (ScreenSaver        *screen_saver,
+                                  ScreenSaverFloater *floater)
+{
+  gdouble performance_ratio;
+  gdouble duration;
+
+  performance_ratio =
+    screen_saver_get_frames_per_second (screen_saver) / OPTIMAL_FRAME_RATE;
+
+  if (abs (performance_ratio) <= G_MINDOUBLE)
+    performance_ratio = 1.0;
+
+  if (screen_saver_floater_should_bubble_up (screen_saver, floater, performance_ratio, &duration))
+    return screen_saver_floater_create_path_to_bubble_up (screen_saver, floater, duration);
+
+  if (screen_saver_floater_should_come_on_screen (screen_saver, floater, performance_ratio, &duration))
+    return screen_saver_floater_create_path_to_on_screen (screen_saver, floater, duration);
+
+  return screen_saver_floater_create_path_to_random_point (screen_saver, floater,
+                                                           g_random_double_range (3.0, 7.0));
+}
+
+static void
+screen_saver_floater_update_state (ScreenSaver        *screen_saver,
+                                   ScreenSaverFloater *floater,
+                                   gdouble             time)
+{
+  gdouble performance_ratio;
+
+  performance_ratio =
+    screen_saver_get_frames_per_second (screen_saver) / OPTIMAL_FRAME_RATE;
+
+  if (floater->path == NULL)
+    {
+      floater->path = screen_saver_floater_create_path (screen_saver, floater);
+      floater->path_start_time = time;
+
+      floater->path_start_scale = floater->scale;
+
+      if (g_random_double () > .5)
+        floater->path_end_scale = g_random_double_range (0.10, performance_ratio);
+
+      /* poor man's distribution */
+      if (screen_saver->should_do_rotations &&
+          (g_random_double () < .75 * performance_ratio))
+        {
+          gint r;
+
+          r = g_random_int_range (0, 100);
+          if (r < 80)
+            floater->angle_increment = 0.0;
+          else if (r < 95)
+            floater->angle_increment = g_random_double_range (-SMALL_ANGLE, SMALL_ANGLE);
+          else
+            floater->angle_increment = g_random_double_range (-BIG_ANGLE, BIG_ANGLE);
+        }
+    }
+
+  if (time < (floater->path_start_time + floater->path->duration))
+    {
+      gdouble path_time;
+
+      path_time = time - floater->path_start_time;
+
+      floater->position =
+          screen_saver_floater_get_position_from_time (screen_saver, floater,
+                                                       path_time);
+      floater->scale =
+          screen_saver_floater_get_scale_from_time (screen_saver, floater, path_time);
+
+      floater->angle =
+          screen_saver_floater_get_angle_from_time (screen_saver, floater, path_time);
+
+      floater->opacity = pow (floater->scale, 1.0 / GAMMA);
+    }
+  else
+    {
+      path_free (floater->path);
+
+      floater->path = NULL;
+      floater->path_start_time = 0.0;
+    }
+}
+
+static GdkPixbuf *
+gamma_correct (const GdkPixbuf *input_pixbuf)
+{
+    gint x, y, width, height, rowstride;
+    GdkPixbuf *output_pixbuf;
+    guchar *pixels;
+
+    output_pixbuf = gdk_pixbuf_copy (input_pixbuf);
+    pixels = gdk_pixbuf_get_pixels (output_pixbuf);
+
+    width = gdk_pixbuf_get_width (output_pixbuf);
+    height = gdk_pixbuf_get_height (output_pixbuf);
+    rowstride = gdk_pixbuf_get_rowstride (output_pixbuf);
+
+    for (y = 0; y < height; y++)
+      for (x = 0; x < width; x++)
+        {
+          guchar *alpha_channel;
+          guchar opacity;
+
+          alpha_channel = pixels + y * (rowstride / 4) + x + 3;
+          opacity = (guchar) (255 * pow ((*alpha_channel / 255.0), 1.0 / GAMMA));
+
+          *alpha_channel = opacity;
+        }
+
+    return output_pixbuf;
+}
+
+static gboolean
+screen_saver_floater_do_draw (ScreenSaver        *screen_saver,
+                              ScreenSaverFloater *floater,
+                              cairo_t            *context)
+{
+  gint size;
+  CachedSource *source;
+
+  size = CLAMP ((int) (FLOATER_MAX_SIZE * floater->scale),
+                FLOATER_MIN_SIZE, FLOATER_MAX_SIZE);
+
+  source = g_hash_table_lookup (screen_saver->cached_sources, GINT_TO_POINTER (size));
+
+  if (source == NULL)
+    {
+      GdkPixbuf *pixbuf;
+      GError *error;
+
+      pixbuf = NULL;
+      error = NULL;
+
+      pixbuf = gdk_pixbuf_new_from_file_at_size (screen_saver->filename, size, -1,
+                                                 &error);
+      if (pixbuf == NULL)
+        {
+          g_assert (error != NULL);
+          g_printerr ("%s", _(error->message));
+          g_error_free (error);
+          return FALSE;
+        }
+
+      if (gdk_pixbuf_get_has_alpha (pixbuf))
+          gamma_correct (pixbuf);
+
+      gdk_cairo_set_source_pixbuf (context, pixbuf, 0.0, 0.0);
+
+      source = cached_source_new (cairo_get_source (context),
+                                  gdk_pixbuf_get_width (pixbuf),
+                                  gdk_pixbuf_get_height (pixbuf));
+      g_object_unref (pixbuf);
+      g_hash_table_insert (screen_saver->cached_sources, GINT_TO_POINTER (size),
+                           source);
+    }
+
+  cairo_save (context);
+
+  if (screen_saver->should_do_rotations && (abs (floater->angle) > G_MINDOUBLE))
+    {
+      floater->bounds.width = G_SQRT2 * source->width + 2;
+      floater->bounds.height = G_SQRT2 * source->height + 2;
+      floater->bounds.x = (int) (floater->position.x - .5 * G_SQRT2 * source->width) - 1;
+      floater->bounds.y = (int) (floater->position.y - .5 * G_SQRT2 * source->height) - 1;
+
+      cairo_translate (context,
+                       trunc (floater->position.x),
+                       trunc (floater->position.y));
+      cairo_rotate (context, floater->angle);
+      cairo_translate (context,
+                       -trunc (floater->position.x),
+                       -trunc (floater->position.y));
+    }
+  else
+    {
+      floater->bounds.width = source->width + 2;
+      floater->bounds.height = source->height + 2;
+      floater->bounds.x = (int) (floater->position.x - .5 * source->width) - 1;
+      floater->bounds.y = (int) (floater->position.y - .5 * source->height) - 1;
+    }
+
+  cairo_translate (context,
+                   trunc (floater->position.x - .5 * source->width),
+                   trunc (floater->position.y - .5 * source->height));
+
+  cairo_set_source (context, source->pattern);
+
+  cairo_rectangle (context,
+                   trunc (.5 * (source->width - floater->bounds.width)),
+                   trunc (.5 * (source->height - floater->bounds.height)),
+                   floater->bounds.width, floater->bounds.height);
+
+  cairo_clip (context);
+  cairo_paint_with_alpha (context, floater->opacity);
+  cairo_restore (context);
+
+  if (screen_saver->should_show_paths && (floater->path != NULL))
+    {
+      gdouble dash_pattern[] = { 5.0 };
+      gint size;
+
+      size = CLAMP ((int) (FLOATER_MAX_SIZE * floater->path_start_scale),
+                    FLOATER_MIN_SIZE, FLOATER_MAX_SIZE);
+
+      cairo_save (context);
+      cairo_set_source_rgba (context, 1.0, 1.0, 1.0, .2 * floater->opacity);
+      cairo_move_to (context,
+                     floater->path->start_point.x,
+                     floater->path->start_point.y);
+      cairo_curve_to (context,
+                      floater->path->start_control_point.x,
+                      floater->path->start_control_point.y,
+                      floater->path->end_control_point.x,
+                      floater->path->end_control_point.y,
+                      floater->path->end_point.x,
+                      floater->path->end_point.y);
+      cairo_set_line_cap (context, CAIRO_LINE_CAP_ROUND);
+      cairo_stroke (context);
+      cairo_set_source_rgba (context, 1.0, 0.0, 0.0, .5 * floater->opacity);
+      cairo_rectangle (context,
+                       floater->path->start_point.x - 3,
+                       floater->path->start_point.y - 3,
+                       6, 6);
+      cairo_fill (context);
+      cairo_set_source_rgba (context, 0.0, 0.5, 0.0, .5 * floater->opacity);
+      cairo_arc (context,
+                 floater->path->start_control_point.x,
+                 floater->path->start_control_point.y,
+                 3, 0.0, 2.0 * G_PI);
+      cairo_stroke (context);
+      cairo_set_source_rgba (context, 0.5, 0.0, 0.5, .5 * floater->opacity);
+      cairo_arc (context,
+                 floater->path->end_control_point.x,
+                 floater->path->end_control_point.y,
+                 3, 0.0, 2.0 * G_PI);
+      cairo_stroke (context);
+      cairo_set_source_rgba (context, 0.0, 0.0, 1.0, .5 * floater->opacity);
+      cairo_rectangle (context,
+                       floater->path->end_point.x - 3,
+                       floater->path->end_point.y - 3,
+                       6, 6);
+      cairo_fill (context);
+
+      cairo_set_dash (context, dash_pattern, G_N_ELEMENTS (dash_pattern), 0);
+      cairo_set_source_rgba (context, .5, .5, .5, .2 * floater->scale);
+      cairo_move_to (context, floater->path->start_point.x,
+                     floater->path->start_point.y);
+      cairo_line_to (context, floater->path->start_control_point.x,
+                     floater->path->start_control_point.y);
+      cairo_stroke (context);
+
+      cairo_move_to (context, floater->path->end_point.x,
+                     floater->path->end_point.y);
+      cairo_line_to (context, floater->path->end_control_point.x,
+                     floater->path->end_control_point.y);
+      cairo_stroke (context);
+
+      cairo_restore (context);
+    }
+
+  return TRUE;
+}
+
+static ScreenSaver *
+screen_saver_new (GtkDrawingArea  *drawing_area,
+                  const gchar     *filename,
+                  gint             max_floater_count,
+                  gboolean         should_do_rotations,
+                  gboolean         should_show_paths)
+{
+  ScreenSaver *screen_saver;
+
+  screen_saver = g_new (ScreenSaver, 1);
+  screen_saver->filename = g_strdup (filename);
+  screen_saver->drawing_area = GTK_WIDGET (drawing_area);
+  screen_saver->cached_sources =
+      g_hash_table_new_full (NULL, NULL, NULL,
+                             (GDestroyNotify) cached_source_free);
+
+  g_signal_connect_swapped (G_OBJECT (drawing_area), "size-allocate",
+                            G_CALLBACK (screen_saver_on_size_allocate),
+                            screen_saver);
+
+  g_signal_connect_swapped (G_OBJECT (drawing_area), "expose-event",
+                            G_CALLBACK (screen_saver_on_expose_event),
+                            screen_saver);
+
+  screen_saver->first_update_time = 0.0;
+  screen_saver->current_calculated_stats_time = 0.0;
+  screen_saver->last_calculated_stats_time = 0.0;
+  screen_saver->update_count = 0;
+  screen_saver->frame_count = 0;
+  screen_saver->updates_per_second = 0.0;
+  screen_saver->frames_per_second = 0.0;
+  screen_saver->floaters = NULL;
+  screen_saver->max_floater_count = max_floater_count;
+
+  screen_saver->should_show_paths = should_show_paths;
+  screen_saver->should_do_rotations = should_do_rotations;
+
+  screen_saver_get_initial_state (screen_saver);
+
+  screen_saver->state_update_timeout_id =
+      g_timeout_add (1000 / (2.0 * OPTIMAL_FRAME_RATE),
+                     (GSourceFunc) screen_saver_do_update_state, screen_saver);
+
+  screen_saver->stats_update_timeout_id =
+      g_timeout_add (1000, (GSourceFunc) screen_saver_do_update_stats,
+                     screen_saver);
+
+  return screen_saver;
+}
+
+static void
+screen_saver_free (ScreenSaver *screen_saver)
+{
+  if (screen_saver == NULL)
+    return;
+
+  g_free (screen_saver->filename);
+
+  g_hash_table_destroy (screen_saver->cached_sources);
+
+  if (screen_saver->state_update_timeout_id != 0)
+    g_source_remove (screen_saver->state_update_timeout_id);
+
+  if (screen_saver->stats_update_timeout_id != 0)
+    g_source_remove (screen_saver->stats_update_timeout_id);
+
+  screen_saver_destroy_floaters (screen_saver);
+
+  g_free (screen_saver);
+}
+
+static gdouble
+screen_saver_get_timestamp (ScreenSaver *screen_saver)
+{
+  const gdouble microseconds_per_second = (gdouble ) G_USEC_PER_SEC;
+  gdouble timestamp;
+  GTimeVal now = { 0L, /* zero-filled */ };
+
+  g_get_current_time (&now);
+  timestamp = ((microseconds_per_second * now.tv_sec) + now.tv_usec) /
+              microseconds_per_second;
+
+  return timestamp;
+}
+
+static void
+screen_saver_create_floaters (ScreenSaver *screen_saver)
+{
+  gint i;
+
+  for (i = 0; i < screen_saver->max_floater_count; i++)
+    {
+      ScreenSaverFloater *floater;
+      Point position;
+      gdouble scale;
+
+      position.x = g_random_double_range (screen_saver->canvas_rectangle.top_left_point.x,
+                                          screen_saver->canvas_rectangle.bottom_right_point.x);
+      position.y = g_random_double_range (screen_saver->canvas_rectangle.top_left_point.y,
+                                          screen_saver->canvas_rectangle.bottom_right_point.y);
+
+      scale = g_random_double ();
+
+      floater = screen_saver_floater_new (screen_saver, &position, scale);
+
+      screen_saver->floaters = g_list_prepend (screen_saver->floaters,
+                                               floater);
+    }
+}
+
+static gdouble
+screen_saver_get_updates_per_second (ScreenSaver *screen_saver)
+{
+  return screen_saver->updates_per_second;
+}
+
+static gdouble
+screen_saver_get_frames_per_second (ScreenSaver *screen_saver)
+{
+  return screen_saver->frames_per_second;
+}
+
+static gdouble
+screen_saver_get_image_cache_usage (ScreenSaver *screen_saver)
+{
+  static const gdouble cache_capacity = (FLOATER_MAX_SIZE - FLOATER_MIN_SIZE + 1);
+
+  return g_hash_table_size (screen_saver->cached_sources) / cache_capacity;
+}
+
+static void
+screen_saver_destroy_floaters (ScreenSaver *screen_saver)
+{
+  if (screen_saver->floaters == NULL)
+    return;
+
+  g_list_foreach (screen_saver->floaters, (GFunc) screen_saver_floater_free,
+                  NULL);
+  g_list_free (screen_saver->floaters);
+
+  screen_saver->floaters = NULL;
+}
+
+static void
+screen_saver_on_size_allocate (ScreenSaver   *screen_saver,
+                               GtkAllocation *allocation)
+{
+  Rectangle canvas_rectangle;
+
+  canvas_rectangle.top_left_point.x = allocation->x - .1 * allocation->width;
+  canvas_rectangle.top_left_point.y = allocation->y - .1 * allocation->height;
+
+  canvas_rectangle.bottom_right_point.x = allocation->x + (1.1 * allocation->width);
+  canvas_rectangle.bottom_right_point.y = allocation->y + (1.1 * allocation->height);
+
+  screen_saver->canvas_rectangle = canvas_rectangle;
+}
+
+static gint
+compare_floaters (ScreenSaverFloater *a,
+                  ScreenSaverFloater *b)
+{
+  if (a->scale > b->scale)
+    return 1;
+  else if (abs (a->scale - b->scale) <= G_MINDOUBLE)
+    return 0;
+  else
+    return -1;
+}
+
+static void
+screen_saver_on_expose_event (ScreenSaver    *screen_saver,
+                              GdkEventExpose *event)
+{
+  GList *tmp;
+  cairo_t *context;
+
+  if (screen_saver->floaters == NULL)
+    screen_saver_create_floaters (screen_saver);
+
+  context = gdk_cairo_create (screen_saver->drawing_area->window);
+
+  cairo_rectangle (context,
+                   (double) event->area.x,
+                   (double) event->area.y,
+                   (double) event->area.width,
+                   (double) event->area.height);
+  cairo_clip (context);
+
+  screen_saver->floaters = g_list_sort (screen_saver->floaters,
+                                        (GCompareFunc)compare_floaters);
+
+  for (tmp = screen_saver->floaters; tmp != NULL; tmp = tmp->next)
+    {
+      ScreenSaverFloater *floater;
+      GdkRectangle rect;
+      gint size;
+
+      floater = (ScreenSaverFloater *) tmp->data;
+
+      size = CLAMP ((int) (FLOATER_MAX_SIZE * floater->scale),
+		    FLOATER_MIN_SIZE, FLOATER_MAX_SIZE);
+
+      rect.x = (int) (floater->position.x - .5 * G_SQRT2 * size);
+      rect.y = (int) (floater->position.y - .5 * G_SQRT2 * size);
+      rect.width = G_SQRT2 * size;
+      rect.height = G_SQRT2 * size;
+
+      if (!gdk_region_rect_in (event->region, &rect))
+        continue;
+
+      if (!screen_saver_floater_do_draw (screen_saver, floater, context))
+        {
+          gtk_main_quit ();
+          break;
+        }
+    }
+
+  cairo_destroy (context);
+
+  screen_saver->draw_ops_pending = TRUE;
+  screen_saver->frame_count++;
+}
+
+static void
+screen_saver_update_state (ScreenSaver *screen_saver,
+                           gdouble      time)
+{
+  GList *tmp;
+
+  tmp = screen_saver->floaters;
+  while (tmp != NULL)
+    {
+      ScreenSaverFloater *floater;
+      floater = (ScreenSaverFloater *) tmp->data;
+
+      screen_saver_floater_update_state (screen_saver, floater, time);
+
+      if (GTK_WIDGET_REALIZED (screen_saver->drawing_area)
+          && (floater->bounds.width > 0) && (floater->bounds.height > 0))
+        {
+          gint size;
+          size = CLAMP ((int) (FLOATER_MAX_SIZE * floater->scale),
+                        FLOATER_MIN_SIZE, FLOATER_MAX_SIZE);
+
+          gtk_widget_queue_draw_area (screen_saver->drawing_area,
+                                      floater->bounds.x,
+                                      floater->bounds.y,
+                                      floater->bounds.width,
+                                      floater->bounds.height);
+
+          /* the edges could concievably be spread across two
+           * pixels so we add +2 to invalidated region
+           */
+          if (screen_saver->should_do_rotations)
+            gtk_widget_queue_draw_area (screen_saver->drawing_area,
+                                        (int) (floater->position.x -
+                                               .5 * G_SQRT2 * size),
+                                        (int) (floater->position.y -
+                                               .5 * G_SQRT2 * size),
+                                        G_SQRT2 * size + 2,
+                                        G_SQRT2 * size + 2);
+          else
+            gtk_widget_queue_draw_area (screen_saver->drawing_area,
+                                        (int) (floater->position.x -
+                                               .5 * size),
+                                        (int) (floater->position.y -
+                                               .5 * size),
+                                        size + 2, size + 2);
+
+          if  (screen_saver->should_show_paths)
+            gtk_widget_queue_draw (screen_saver->drawing_area);
+        }
+
+      tmp = tmp->next;
+    }
+}
+
+static void
+screen_saver_get_initial_state (ScreenSaver *screen_saver)
+{
+  screen_saver->first_update_time = screen_saver_get_timestamp (screen_saver);
+  screen_saver_update_state (screen_saver, 0.0);
+}
+
+static gboolean
+screen_saver_do_update_state (ScreenSaver *screen_saver)
+{
+  gdouble current_update_time;
+
+  /* flush pending requests to the X server and block for
+   * replies before proceeding to help prevent the X server from
+   * getting overrun with requests
+   */
+  if (screen_saver->draw_ops_pending)
+    {
+      gdk_flush ();
+      screen_saver->draw_ops_pending = FALSE;
+    }
+
+  current_update_time = screen_saver_get_timestamp (screen_saver);
+  screen_saver_update_state (screen_saver, current_update_time -
+                                           screen_saver->first_update_time);
+  screen_saver->update_count++;
+  return TRUE;
+}
+
+static gboolean
+screen_saver_do_update_stats (ScreenSaver *screen_saver)
+{
+  gdouble last_calculated_stats_time, seconds_since_last_stats_update;
+
+  last_calculated_stats_time = screen_saver->current_calculated_stats_time;
+  screen_saver->current_calculated_stats_time =
+      screen_saver_get_timestamp (screen_saver);
+  screen_saver->last_calculated_stats_time = last_calculated_stats_time;
+
+  if (abs (last_calculated_stats_time) <= G_MINDOUBLE)
+    return TRUE;
+
+  seconds_since_last_stats_update =
+      screen_saver->current_calculated_stats_time - last_calculated_stats_time;
+
+  screen_saver->updates_per_second =
+      screen_saver->update_count / seconds_since_last_stats_update;
+  screen_saver->frames_per_second =
+      screen_saver->frame_count / seconds_since_last_stats_update;
+
+  screen_saver->update_count = 0;
+  screen_saver->frame_count = 0;
+
+  return TRUE;
+}
+
+static gboolean
+do_print_screen_saver_stats (ScreenSaver *screen_saver)
+{
+
+  g_print ("updates per second: %.2f, frames per second: %.2f, "
+           "image cache %.0f%% full\n",
+           screen_saver_get_updates_per_second (screen_saver),
+           screen_saver_get_frames_per_second (screen_saver),
+           screen_saver_get_image_cache_usage (screen_saver) * 100.0);
+
+  return TRUE;
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  ScreenSaver *screen_saver;
+  GtkWidget *window;
+  GtkWidget *drawing_area;
+
+  GtkStateType state;
+
+  GError *error;
+
+  error = NULL;
+
+  bindtextdomain (GETTEXT_PACKAGE, MATELOCALEDIR);
+  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+  textdomain (GETTEXT_PACKAGE);
+
+  gtk_init_with_args (&argc, &argv,
+                      /* translators: the word "image" here
+                       * represents a command line argument
+                       */
+                      _("image - floats images around the screen"),
+                      options, GETTEXT_PACKAGE, &error);
+
+
+  if (error != NULL)
+    {
+      g_printerr (_("%s. See --help for usage information.\n"),
+                  _(error->message));
+      g_error_free (error);
+      return EX_SOFTWARE;
+    }
+
+  if ((filenames == NULL) || (filenames[0] == NULL) ||
+      (filenames[1] != NULL))
+    {
+      g_printerr (_("You must specify one image.  See --help for usage "
+                    "information.\n"));
+      return EX_USAGE;
+    }
+
+  window = gs_theme_window_new ();
+
+  g_signal_connect (G_OBJECT (window), "delete-event",
+                    G_CALLBACK (gtk_main_quit), NULL);
+
+  drawing_area = gtk_drawing_area_new ();
+
+  state = (GtkStateType) 0;
+  while (state < (GtkStateType) G_N_ELEMENTS (drawing_area->style->bg))
+    {
+      gtk_widget_modify_bg (drawing_area, state, &drawing_area->style->mid[state]);
+      state++;
+    }
+
+  gtk_widget_show (drawing_area);
+  gtk_container_add (GTK_CONTAINER (window), drawing_area);
+
+  screen_saver = screen_saver_new (GTK_DRAWING_AREA (drawing_area),
+                                   filenames[0], max_floater_count,
+                                   should_do_rotations, should_show_paths);
+  g_strfreev (filenames);
+
+  if (should_print_stats)
+    g_timeout_add (STAT_PRINT_FREQUENCY,
+                   (GSourceFunc) do_print_screen_saver_stats,
+                   screen_saver);
+
+  if ((geometry == NULL)
+      || !gtk_window_parse_geometry (GTK_WINDOW (window), geometry))
+    gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
+
+  gtk_widget_show (window);
+
+  gtk_main ();
+
+  screen_saver_free (screen_saver);
+
+  return EX_OK;
+}