gdk: Make atoms handled generically

This is another step towards making GdkDisplayManager backend-agnostic.

Most of the backends profit from this as their atom implementations
where generic anyway - x11 needed that to allow multiple X displays and
broadway, quartz and wayland don't have the concept of displays.

The X11 backend still did things, so I only #if 0'd some code but did
not actually update anything.

1 files changed, 220 insertions, 0 deletions

diff --git a/gdk/gdkproperty.c b/gdk/gdkproperty.c
new file mode 100644
index 0000000000..7ba0f83bc4
--- /dev/null
+++ b/gdk/gdkproperty.c
@@ -0,0 +1,220 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2000 Red Hat, Inc.
+ *               2005 Imendio AB
+ *
+ * This library 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 library 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 library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gdkproperty.h"
+
+#include "gdkprivate.h"
+
+static GHashTable *names_to_atoms;
+static GPtrArray *atoms_to_names;
+
+static const gchar xatoms_string[] = 
+  /* These are all the standard predefined X atoms */
+  "NONE\0"
+  "PRIMARY\0"
+  "SECONDARY\0"
+  "ARC\0"
+  "ATOM\0"
+  "BITMAP\0"
+  "CARDINAL\0"
+  "COLORMAP\0"
+  "CURSOR\0"
+  "CUT_BUFFER0\0"
+  "CUT_BUFFER1\0"
+  "CUT_BUFFER2\0"
+  "CUT_BUFFER3\0"
+  "CUT_BUFFER4\0"
+  "CUT_BUFFER5\0"
+  "CUT_BUFFER6\0"
+  "CUT_BUFFER7\0"
+  "DRAWABLE\0"
+  "FONT\0"
+  "INTEGER\0"
+  "PIXMAP\0"
+  "POINT\0"
+  "RECTANGLE\0"
+  "RESOURCE_MANAGER\0"
+  "RGB_COLOR_MAP\0"
+  "RGB_BEST_MAP\0"
+  "RGB_BLUE_MAP\0"
+  "RGB_DEFAULT_MAP\0"
+  "RGB_GRAY_MAP\0"
+  "RGB_GREEN_MAP\0"
+  "RGB_RED_MAP\0"
+  "STRING\0"
+  "VISUALID\0"
+  "WINDOW\0"
+  "WM_COMMAND\0"
+  "WM_HINTS\0"
+  "WM_CLIENT_MACHINE\0"
+  "WM_ICON_NAME\0"
+  "WM_ICON_SIZE\0"
+  "WM_NAME\0"
+  "WM_NORMAL_HINTS\0"
+  "WM_SIZE_HINTS\0"
+  "WM_ZOOM_HINTS\0"
+  "MIN_SPACE\0"
+  "NORM_SPACE\0"
+  "MAX_SPACE\0"
+  "END_SPACE\0"
+  "SUPERSCRIPT_X\0"
+  "SUPERSCRIPT_Y\0"
+  "SUBSCRIPT_X\0"
+  "SUBSCRIPT_Y\0"
+  "UNDERLINE_POSITION\0"
+  "UNDERLINE_THICKNESS\0"
+  "STRIKEOUT_ASCENT\0"
+  "STRIKEOUT_DESCENT\0"
+  "ITALIC_ANGLE\0"
+  "X_HEIGHT\0"
+  "QUAD_WIDTH\0"
+  "WEIGHT\0"
+  "POINT_SIZE\0"
+  "RESOLUTION\0"
+  "COPYRIGHT\0"
+  "NOTICE\0"
+  "FONT_NAME\0"
+  "FAMILY_NAME\0"
+  "FULL_NAME\0"
+  "CAP_HEIGHT\0"
+  "WM_CLASS\0"
+  "WM_TRANSIENT_FOR\0"
+  "CLIPBOARD\0"			/* = 69 */;
+
+static const gint xatoms_offset[] = {
+    0,   5,  13,  23,  27,  32,  39,  48,  57,  64,  76,  88, 
+  100, 112, 124, 136, 148, 160, 169, 174, 182, 189, 195, 205, 
+  222, 236, 249, 262, 278, 291, 305, 317, 324, 333, 340, 351, 
+  360, 378, 391, 404, 412, 428, 442, 456, 466, 477, 487, 497, 
+  511, 525, 537, 549, 568, 588, 605, 623, 636, 645, 656, 663, 
+  674, 685, 695, 702, 712, 724, 734, 745, 754, 771
+};
+
+static void
+ensure_atom_tables (void)
+{
+  int i;
+  
+  if (names_to_atoms)
+    return;
+
+  names_to_atoms = g_hash_table_new (g_str_hash, g_str_equal);
+  atoms_to_names = g_ptr_array_sized_new (G_N_ELEMENTS (xatoms_offset));
+
+  for (i = 0; i < G_N_ELEMENTS (xatoms_offset); i++)
+    {
+      g_hash_table_insert(names_to_atoms, (gchar *)xatoms_string + xatoms_offset[i], GINT_TO_POINTER (i));
+      g_ptr_array_add(atoms_to_names, (gchar *)xatoms_string + xatoms_offset[i]);
+    }
+}
+
+static GdkAtom
+intern_atom_internal (const gchar *atom_name, gboolean allocate)
+{
+  gpointer result;
+  gchar *name;
+
+  ensure_atom_tables ();
+  
+  if (g_hash_table_lookup_extended (names_to_atoms, atom_name, NULL, &result))
+    return result;
+  
+  result = GINT_TO_POINTER (atoms_to_names->len);
+  name = allocate ? g_strdup (atom_name) : (gchar *)atom_name;
+  g_hash_table_insert(names_to_atoms, name, result);
+  g_ptr_array_add(atoms_to_names, name);
+  
+  return result;  
+}
+
+/**
+ * gdk_atom_intern:
+ * @atom_name: a string.
+ * @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
+ *   just return %GDK_NONE if the requested atom doesn't already
+ *   exists. Currently, the flag is ignored, since checking the
+ *   existance of an atom is as expensive as creating it.
+ *
+ * Finds or creates an atom corresponding to a given string.
+ *
+ * Returns: (transfer none): the atom corresponding to @atom_name.
+ */
+GdkAtom
+gdk_atom_intern (const gchar *atom_name,
+                 gboolean     only_if_exists)
+{
+  g_return_val_if_fail (atom_name != NULL, GDK_NONE);
+
+  return intern_atom_internal (atom_name, TRUE);
+}
+
+/**
+ * gdk_atom_intern_static_string:
+ * @atom_name: a static string
+ *
+ * Finds or creates an atom corresponding to a given string.
+ *
+ * Note that this function is identical to gdk_atom_intern() except
+ * that if a new #GdkAtom is created the string itself is used rather
+ * than a copy. This saves memory, but can only be used if the string
+ * will <emphasis>always</emphasis> exist. It can be used with statically
+ * allocated strings in the main program, but not with statically
+ * allocated memory in dynamically loaded modules, if you expect to
+ * ever unload the module again (e.g. do not use this function in
+ * GTK+ theme engines).
+ *
+ * Returns: (transfer none): the atom corresponding to @atom_name
+ *
+ * Since: 2.10
+ */
+GdkAtom
+gdk_atom_intern_static_string (const gchar *atom_name)
+{
+  g_return_val_if_fail (atom_name != NULL, GDK_NONE);
+
+  return intern_atom_internal (atom_name, FALSE);
+}
+
+/**
+ * gdk_atom_name:
+ * @atom: a #GdkAtom.
+ *
+ * Determines the string corresponding to an atom.
+ *
+ * Returns: a newly-allocated string containing the string
+ *   corresponding to @atom. When you are done with the
+ *   return value, you should free it using g_free().
+ */
+gchar *
+gdk_atom_name (GdkAtom atom)
+{
+  return g_strdup (_gdk_atom_name_const (atom));
+}
+
+const gchar *
+_gdk_atom_name_const (GdkAtom atom)
+{
+  ensure_atom_tables ();
+
+  if (GPOINTER_TO_INT (atom) >= atoms_to_names->len)
+    return NULL;
+
+  return g_ptr_array_index (atoms_to_names, GPOINTER_TO_INT (atom));
+}