| 1 | /* |
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| 2 | * panel-background-monitor.c: |
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| 3 | * |
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| 4 | * Copyright (C) 2001, 2002 Ian McKellar <yakk@yakk.net> |
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| 5 | * 2002 Sun Microsystems, Inc. |
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| 6 | * |
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| 7 | * This library is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Library General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * This library is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Library General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Library General Public |
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| 18 | * License along with this library; if not, write to the |
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| 19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 20 | * Boston, MA 02111-1307, USA. |
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| 21 | * |
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| 22 | * Authors: |
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| 23 | * Ian McKellar <yakk@yakk.net> |
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| 24 | * Mark McLoughlin <mark@skynet.ie> |
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| 25 | */ |
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| 26 | |
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| 27 | #include <glib.h> |
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| 28 | #include <glib-object.h> |
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| 29 | #include <gdk/gdk.h> |
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| 30 | #include <gdk/gdkx.h> |
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| 31 | #include <X11/Xlib.h> |
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| 32 | #include <X11/Xatom.h> |
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| 33 | |
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| 34 | #include "panel-background-monitor.h" |
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| 35 | #include "panel-util.h" |
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| 36 | |
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| 37 | enum { |
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| 38 | CHANGED, |
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| 39 | LAST_SIGNAL |
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| 40 | }; |
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| 41 | |
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| 42 | static void panel_background_monitor_changed (PanelBackgroundMonitor *monitor); |
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| 43 | |
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| 44 | static GdkFilterReturn panel_background_monitor_xevent_filter (GdkXEvent *xevent, |
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| 45 | GdkEvent *event, |
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| 46 | gpointer data); |
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| 47 | |
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| 48 | struct _PanelBackgroundMonitorClass { |
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| 49 | GObjectClass parent_class; |
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| 50 | void (*changed) (PanelBackgroundMonitor *monitor); |
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| 51 | }; |
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| 52 | |
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| 53 | struct _PanelBackgroundMonitor { |
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| 54 | GObject parent_instance; |
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| 55 | |
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| 56 | GdkScreen *screen; |
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| 57 | |
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| 58 | Window xwindow; |
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| 59 | GdkWindow *gdkwindow; |
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| 60 | |
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| 61 | Atom xatom; |
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| 62 | GdkAtom gdkatom; |
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| 63 | |
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| 64 | GdkPixmap *gdkpixmap; |
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| 65 | GdkPixbuf *gdkpixbuf; |
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| 66 | |
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| 67 | int width; |
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| 68 | int height; |
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| 69 | |
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| 70 | gboolean display_grabbed; |
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| 71 | }; |
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| 72 | |
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| 73 | static GObjectClass *parent_class; |
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| 74 | |
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| 75 | static PanelBackgroundMonitor **global_background_monitors = NULL; |
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| 76 | |
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| 77 | static guint signals [LAST_SIGNAL] = { 0 }; |
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| 78 | |
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| 79 | static void |
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| 80 | panel_background_monitor_finalize (GObject *object) |
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| 81 | { |
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| 82 | PanelBackgroundMonitor *monitor; |
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| 83 | |
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| 84 | monitor = PANEL_BACKGROUND_MONITOR (object); |
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| 85 | |
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| 86 | gdk_window_remove_filter ( |
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| 87 | monitor->gdkwindow, panel_background_monitor_xevent_filter, monitor); |
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| 88 | g_signal_handlers_disconnect_by_func (monitor->screen, |
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| 89 | panel_background_monitor_changed, monitor); |
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| 90 | |
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| 91 | if (monitor->gdkpixmap) |
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| 92 | g_object_unref (monitor->gdkpixmap); |
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| 93 | monitor->gdkpixmap = NULL; |
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| 94 | |
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| 95 | if (monitor->gdkpixbuf) |
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| 96 | g_object_unref (monitor->gdkpixbuf); |
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| 97 | monitor->gdkpixbuf = NULL; |
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| 98 | |
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| 99 | parent_class->finalize (object); |
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| 100 | } |
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| 101 | |
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| 102 | static void |
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| 103 | panel_background_monitor_class_init (PanelBackgroundMonitorClass *klass) |
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| 104 | { |
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| 105 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
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| 106 | |
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| 107 | parent_class = g_type_class_peek_parent (klass); |
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| 108 | |
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| 109 | signals [CHANGED] = |
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| 110 | g_signal_new ("changed", |
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| 111 | G_OBJECT_CLASS_TYPE (object_class), |
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| 112 | G_SIGNAL_RUN_LAST, |
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| 113 | G_STRUCT_OFFSET (PanelBackgroundMonitorClass, changed), |
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| 114 | NULL, NULL, |
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| 115 | g_cclosure_marshal_VOID__VOID, |
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| 116 | G_TYPE_NONE, 0); |
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| 117 | |
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| 118 | object_class->finalize = panel_background_monitor_finalize; |
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| 119 | } |
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| 120 | |
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| 121 | static void |
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| 122 | panel_background_monitor_init (PanelBackgroundMonitor *monitor) |
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| 123 | { |
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| 124 | monitor->screen = NULL; |
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| 125 | |
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| 126 | monitor->gdkwindow = NULL; |
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| 127 | monitor->xwindow = None; |
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| 128 | |
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| 129 | monitor->gdkatom = gdk_atom_intern ("_XROOTPMAP_ID", FALSE); |
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| 130 | monitor->xatom = gdk_x11_atom_to_xatom (monitor->gdkatom); |
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| 131 | |
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| 132 | monitor->gdkpixmap = NULL; |
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| 133 | monitor->gdkpixbuf = NULL; |
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| 134 | |
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| 135 | monitor->display_grabbed = FALSE; |
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| 136 | } |
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| 137 | |
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| 138 | GType |
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| 139 | panel_background_monitor_get_type (void) |
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| 140 | { |
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| 141 | static GType object_type = 0; |
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| 142 | |
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| 143 | if (!object_type) { |
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| 144 | static const GTypeInfo object_info = { |
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| 145 | sizeof (PanelBackgroundMonitorClass), |
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| 146 | (GBaseInitFunc) NULL, |
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| 147 | (GBaseFinalizeFunc) NULL, |
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| 148 | (GClassInitFunc) panel_background_monitor_class_init, |
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| 149 | NULL, /* class_finalize */ |
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| 150 | NULL, /* class_data */ |
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| 151 | sizeof (PanelBackgroundMonitor), |
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| 152 | 0, /* n_preallocs */ |
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| 153 | (GInstanceInitFunc) panel_background_monitor_init, |
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| 154 | }; |
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| 155 | |
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| 156 | object_type = g_type_register_static ( |
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| 157 | G_TYPE_OBJECT, "PanelBackgroundMonitor", &object_info, 0); |
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| 158 | } |
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| 159 | |
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| 160 | return object_type; |
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| 161 | } |
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| 162 | |
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| 163 | static void |
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| 164 | panel_background_monitor_connect_to_screen (PanelBackgroundMonitor *monitor, |
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| 165 | GdkScreen *screen) |
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| 166 | { |
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| 167 | if (monitor->screen != NULL && monitor->gdkwindow != NULL) { |
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| 168 | gdk_window_remove_filter (monitor->gdkwindow, |
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| 169 | panel_background_monitor_xevent_filter, |
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| 170 | monitor); |
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| 171 | } |
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| 172 | |
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| 173 | monitor->screen = screen; |
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| 174 | g_signal_connect_swapped (screen, "size-changed", |
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| 175 | G_CALLBACK (panel_background_monitor_changed), monitor); |
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| 176 | |
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| 177 | monitor->gdkwindow = gdk_screen_get_root_window (screen); |
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| 178 | monitor->xwindow = gdk_x11_drawable_get_xid (monitor->gdkwindow); |
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| 179 | |
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| 180 | gdk_window_add_filter ( |
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| 181 | monitor->gdkwindow, panel_background_monitor_xevent_filter, monitor); |
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| 182 | |
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| 183 | gdk_window_set_events ( |
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| 184 | monitor->gdkwindow, |
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| 185 | gdk_window_get_events (monitor->gdkwindow) | GDK_PROPERTY_CHANGE_MASK); |
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| 186 | } |
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| 187 | |
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| 188 | static PanelBackgroundMonitor * |
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| 189 | panel_background_monitor_new (GdkScreen *screen) |
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| 190 | { |
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| 191 | PanelBackgroundMonitor *monitor; |
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| 192 | |
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| 193 | monitor = g_object_new (PANEL_TYPE_BACKGROUND_MONITOR, NULL); |
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| 194 | |
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| 195 | panel_background_monitor_connect_to_screen (monitor, screen); |
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| 196 | |
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| 197 | return monitor; |
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| 198 | } |
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| 199 | |
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| 200 | PanelBackgroundMonitor * |
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| 201 | panel_background_monitor_get_for_screen (GdkScreen *screen) |
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| 202 | { |
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| 203 | int screen_number; |
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| 204 | |
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| 205 | screen_number = gdk_screen_get_number (screen); |
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| 206 | |
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| 207 | if (!global_background_monitors) { |
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| 208 | int n_screens; |
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| 209 | |
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| 210 | n_screens = gdk_display_get_n_screens (gdk_display_get_default ()); |
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| 211 | |
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| 212 | global_background_monitors = g_new0 (PanelBackgroundMonitor *, n_screens); |
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| 213 | } |
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| 214 | |
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| 215 | if (!global_background_monitors [screen_number]) { |
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| 216 | global_background_monitors [screen_number] = |
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| 217 | panel_background_monitor_new (screen); |
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| 218 | |
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| 219 | g_object_add_weak_pointer ( |
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| 220 | G_OBJECT (global_background_monitors [screen_number]), |
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| 221 | (void **) &global_background_monitors [screen_number]); |
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| 222 | |
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| 223 | return global_background_monitors [screen_number]; |
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| 224 | } |
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| 225 | |
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| 226 | return g_object_ref (global_background_monitors [screen_number]); |
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| 227 | } |
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| 228 | |
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| 229 | static void |
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| 230 | panel_background_monitor_changed (PanelBackgroundMonitor *monitor) |
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| 231 | { |
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| 232 | if (monitor->gdkpixmap) |
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| 233 | g_object_unref (monitor->gdkpixmap); |
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| 234 | monitor->gdkpixmap = NULL; |
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| 235 | |
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| 236 | if (monitor->gdkpixbuf) |
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| 237 | g_object_unref (monitor->gdkpixbuf); |
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| 238 | monitor->gdkpixbuf = NULL; |
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| 239 | |
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| 240 | g_signal_emit (monitor, signals [CHANGED], 0); |
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| 241 | } |
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| 242 | |
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| 243 | static GdkFilterReturn |
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| 244 | panel_background_monitor_xevent_filter (GdkXEvent *xevent, |
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| 245 | GdkEvent *event, |
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| 246 | gpointer data) |
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| 247 | { |
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| 248 | PanelBackgroundMonitor *monitor; |
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| 249 | XEvent *xev; |
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| 250 | |
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| 251 | g_return_val_if_fail (PANEL_IS_BACKGROUND_MONITOR (data), GDK_FILTER_CONTINUE); |
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| 252 | |
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| 253 | monitor = PANEL_BACKGROUND_MONITOR (data); |
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| 254 | xev = (XEvent *) xevent; |
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| 255 | |
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| 256 | if (xev->type == PropertyNotify && |
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| 257 | xev->xproperty.atom == monitor->xatom && |
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| 258 | xev->xproperty.window == monitor->xwindow) |
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| 259 | panel_background_monitor_changed (monitor); |
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| 260 | |
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| 261 | return GDK_FILTER_CONTINUE; |
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| 262 | } |
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| 263 | |
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| 264 | static void |
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| 265 | panel_background_monitor_setup_pixmap (PanelBackgroundMonitor *monitor) |
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| 266 | { |
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| 267 | Pixmap *prop_data = NULL; |
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| 268 | GdkAtom prop_type; |
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| 269 | |
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| 270 | g_assert (monitor->display_grabbed); |
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| 271 | |
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| 272 | if (!gdk_property_get ( |
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| 273 | monitor->gdkwindow, monitor->gdkatom, |
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| 274 | gdk_x11_xatom_to_atom (XA_PIXMAP), 0, 10, |
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| 275 | FALSE, &prop_type, NULL, NULL, (gpointer) &prop_data)) |
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| 276 | return; |
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| 277 | |
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| 278 | if ((prop_type == GDK_TARGET_PIXMAP) && prop_data && prop_data [0]) { |
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| 279 | GdkDisplay *display; |
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| 280 | |
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| 281 | g_assert (monitor->gdkpixmap == NULL); |
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| 282 | |
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| 283 | display = gdk_screen_get_display (monitor->screen); |
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| 284 | |
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| 285 | monitor->gdkpixmap = gdk_pixmap_foreign_new_for_display (display, |
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| 286 | prop_data [0]); |
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| 287 | |
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| 288 | if (!monitor->gdkpixmap) |
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| 289 | g_warning ("couldn't get background pixmap\n"); |
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| 290 | } |
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| 291 | |
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| 292 | g_free (prop_data); |
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| 293 | } |
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| 294 | |
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| 295 | static GdkPixbuf * |
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| 296 | panel_background_monitor_tile_background (PanelBackgroundMonitor *monitor, |
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| 297 | int width, |
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| 298 | int height) |
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| 299 | { |
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| 300 | GdkPixbuf *retval; |
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| 301 | int tilewidth, tileheight; |
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| 302 | |
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| 303 | retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height); |
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| 304 | |
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| 305 | tilewidth = gdk_pixbuf_get_width (monitor->gdkpixbuf); |
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| 306 | tileheight = gdk_pixbuf_get_height (monitor->gdkpixbuf); |
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| 307 | |
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| 308 | if (tilewidth == 1 && tileheight == 1) { |
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| 309 | guchar *pixels; |
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| 310 | int n_channels; |
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| 311 | guint32 pixel = 0; |
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| 312 | |
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| 313 | n_channels = gdk_pixbuf_get_n_channels (monitor->gdkpixbuf); |
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| 314 | pixels = gdk_pixbuf_get_pixels (monitor->gdkpixbuf); |
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| 315 | |
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| 316 | if (pixels) { |
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| 317 | if (n_channels == 4) |
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| 318 | pixel = ((guint32 *) pixels) [0]; |
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| 319 | else if (n_channels == 3) |
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| 320 | pixel = pixels [0] << 24 | pixels [1] << 16 | pixels [2] << 8; |
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| 321 | } |
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| 322 | |
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| 323 | gdk_pixbuf_fill (retval, pixel); |
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| 324 | } else { |
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| 325 | unsigned char *data; |
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| 326 | cairo_t *cr; |
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| 327 | cairo_surface_t *surface; |
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| 328 | cairo_pattern_t *pattern; |
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| 329 | |
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| 330 | data = g_malloc (width * height * 4); |
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| 331 | if (!data) |
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| 332 | return NULL; |
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| 333 | |
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| 334 | surface = cairo_image_surface_create_for_data (data, |
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| 335 | CAIRO_FORMAT_RGB24, |
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| 336 | width, height, |
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| 337 | width * 4); |
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| 338 | cr = cairo_create (surface); |
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| 339 | cairo_set_source_rgb (cr, 1, 1, 1); |
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| 340 | cairo_paint (cr); |
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| 341 | |
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| 342 | gdk_cairo_set_source_pixbuf (cr, monitor->gdkpixbuf, 0, 0); |
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| 343 | pattern = cairo_get_source (cr); |
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| 344 | cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT); |
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| 345 | cairo_rectangle (cr, 0, 0, width, height); |
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| 346 | cairo_fill (cr); |
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| 347 | |
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| 348 | cairo_destroy (cr); |
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| 349 | cairo_surface_destroy (surface); |
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| 350 | |
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| 351 | retval = panel_util_cairo_rgbdata_to_pixbuf (data, |
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| 352 | width, height); |
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| 353 | |
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| 354 | g_free (data); |
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| 355 | } |
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| 356 | |
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| 357 | return retval; |
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| 358 | } |
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| 359 | |
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| 360 | static void |
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| 361 | panel_background_monitor_setup_pixbuf (PanelBackgroundMonitor *monitor) |
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| 362 | { |
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| 363 | GdkColormap *colormap = NULL; |
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| 364 | GdkDisplay *display; |
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| 365 | int rwidth, rheight; |
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| 366 | int pwidth, pheight; |
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| 367 | |
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| 368 | display = gdk_screen_get_display (monitor->screen); |
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| 369 | |
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| 370 | gdk_x11_display_grab (display); |
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| 371 | monitor->display_grabbed = TRUE; |
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| 372 | |
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| 373 | if (!monitor->gdkpixmap) |
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| 374 | panel_background_monitor_setup_pixmap (monitor); |
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| 375 | |
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| 376 | if (!monitor->gdkpixmap) { |
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| 377 | gdk_x11_display_ungrab (display); |
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| 378 | monitor->display_grabbed = FALSE; |
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| 379 | return; |
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| 380 | } |
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| 381 | |
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| 382 | gdk_drawable_get_size ( |
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| 383 | GDK_DRAWABLE (monitor->gdkpixmap), &pwidth, &pheight); |
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| 384 | |
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| 385 | gdk_window_get_geometry (monitor->gdkwindow, |
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| 386 | NULL, NULL, &rwidth, &rheight, NULL); |
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| 387 | |
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| 388 | monitor->width = MIN (pwidth, rwidth); |
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| 389 | monitor->height = MIN (pheight, rheight); |
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| 390 | |
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| 391 | colormap = gdk_drawable_get_colormap (monitor->gdkwindow); |
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| 392 | |
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| 393 | g_assert (monitor->gdkpixbuf == NULL); |
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| 394 | monitor->gdkpixbuf = gdk_pixbuf_get_from_drawable ( |
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| 395 | NULL, monitor->gdkpixmap, colormap, |
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| 396 | 0, 0, 0, 0, |
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| 397 | monitor->width, monitor->height); |
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| 398 | |
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| 399 | gdk_x11_display_ungrab (display); |
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| 400 | monitor->display_grabbed = FALSE; |
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| 401 | |
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| 402 | if (monitor->gdkpixbuf == NULL) |
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| 403 | return; |
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| 404 | |
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| 405 | if ((monitor->width < rwidth || monitor->height < rheight)) { |
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| 406 | GdkPixbuf *tiled; |
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| 407 | |
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| 408 | tiled = panel_background_monitor_tile_background ( |
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| 409 | monitor, rwidth, rheight); |
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| 410 | g_object_unref (monitor->gdkpixbuf); |
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| 411 | monitor->gdkpixbuf = tiled; |
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| 412 | |
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| 413 | monitor->width = rwidth; |
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| 414 | monitor->height = rheight; |
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| 415 | } |
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| 416 | } |
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| 417 | |
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| 418 | GdkPixbuf * |
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| 419 | panel_background_monitor_get_region (PanelBackgroundMonitor *monitor, |
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| 420 | int x, |
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| 421 | int y, |
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| 422 | int width, |
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| 423 | int height) |
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| 424 | { |
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| 425 | GdkPixbuf *pixbuf, *tmpbuf; |
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| 426 | int subwidth, subheight; |
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| 427 | int subx, suby; |
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| 428 | |
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| 429 | if (!monitor->gdkpixbuf) |
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| 430 | panel_background_monitor_setup_pixbuf (monitor); |
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| 431 | |
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| 432 | if (!monitor->gdkpixbuf) |
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| 433 | return NULL; |
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| 434 | |
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| 435 | subwidth = MIN (width, monitor->width - x); |
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| 436 | subheight = MIN (height, monitor->height - y); |
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| 437 | /* if x or y are negative numbers */ |
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| 438 | subwidth = MIN (subwidth, width + x); |
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| 439 | subheight = MIN (subheight, height + y); |
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| 440 | |
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| 441 | subx = MAX (x, 0); |
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| 442 | suby = MAX (y, 0); |
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| 443 | |
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| 444 | if ((subwidth <= 0) || (subheight <= 0) || |
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| 445 | (monitor->width-x < 0) || (monitor->height-y < 0) ) |
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| 446 | /* region is completely offscreen */ |
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| 447 | return gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, |
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| 448 | width, height); |
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| 449 | |
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| 450 | pixbuf = gdk_pixbuf_new_subpixbuf ( |
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| 451 | monitor->gdkpixbuf, subx, suby, subwidth, subheight); |
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| 452 | |
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| 453 | if ((subwidth < width) || (subheight < height)) { |
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| 454 | tmpbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, |
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| 455 | width, height); |
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| 456 | gdk_pixbuf_copy_area (pixbuf, 0, 0, subwidth, subheight, |
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| 457 | tmpbuf, (x < 0) ? -x : 0, (y < 0) ? -y : 0); |
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| 458 | g_object_unref (pixbuf); |
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| 459 | pixbuf = tmpbuf; |
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| 460 | } |
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| 461 | |
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| 462 | return pixbuf; |
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| 463 | } |
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