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255 lines
7.0 KiB
C
255 lines
7.0 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2000 Red Hat, Inc.
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* 2005 Imendio AB
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkproperty.h"
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#include "gdkprivate.h"
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/**
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* SECTION:properties
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* @Short_description: Functions to manipulate properties on windows
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* @Title: Properties and Atoms
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*
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* Each window under X can have any number of associated
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* “properties” attached to it.
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* Properties are arbitrary chunks of data identified by
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* “atom”s. (An “atom”
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* is a numeric index into a string table on the X server. They are used
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* to transfer strings efficiently between clients without
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* having to transfer the entire string.) A property
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* has an associated type, which is also identified
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* using an atom.
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*
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* A property has an associated “format”,
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* an integer describing how many bits are in each unit
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* of data inside the property. It must be 8, 16, or 32.
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* When data is transferred between the server and client,
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* if they are of different endianesses it will be byteswapped
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* as necessary according to the format of the property.
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* Note that on the client side, properties of format 32
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* will be stored with one unit per long,
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* even if a long integer has more than 32 bits on the platform.
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* (This decision was apparently made for Xlib to maintain
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* compatibility with programs that assumed longs were 32
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* bits, at the expense of programs that knew better.)
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*
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* The functions in this section are used to add, remove
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* and change properties on windows, to convert atoms
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* to and from strings and to manipulate some types of
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* data commonly stored in X window properties.
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*/
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static GHashTable *names_to_atoms;
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static GPtrArray *atoms_to_names;
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static const gchar xatoms_string[] =
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/* These are all the standard predefined X atoms */
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"NONE\0"
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"PRIMARY\0"
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"SECONDARY\0"
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"ARC\0"
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"ATOM\0"
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"BITMAP\0"
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"CARDINAL\0"
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"COLORMAP\0"
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"CURSOR\0"
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"CUT_BUFFER0\0"
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"CUT_BUFFER1\0"
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"CUT_BUFFER2\0"
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"CUT_BUFFER3\0"
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"CUT_BUFFER4\0"
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"CUT_BUFFER5\0"
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"CUT_BUFFER6\0"
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"CUT_BUFFER7\0"
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"DRAWABLE\0"
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"FONT\0"
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"INTEGER\0"
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"PIXMAP\0"
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"POINT\0"
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"RECTANGLE\0"
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"RESOURCE_MANAGER\0"
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"RGB_COLOR_MAP\0"
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"RGB_BEST_MAP\0"
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"RGB_BLUE_MAP\0"
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"RGB_DEFAULT_MAP\0"
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"RGB_GRAY_MAP\0"
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"RGB_GREEN_MAP\0"
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"RGB_RED_MAP\0"
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"STRING\0"
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"VISUALID\0"
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"WINDOW\0"
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"WM_COMMAND\0"
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"WM_HINTS\0"
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"WM_CLIENT_MACHINE\0"
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"WM_ICON_NAME\0"
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"WM_ICON_SIZE\0"
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"WM_NAME\0"
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"WM_NORMAL_HINTS\0"
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"WM_SIZE_HINTS\0"
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"WM_ZOOM_HINTS\0"
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"MIN_SPACE\0"
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"NORM_SPACE\0"
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"MAX_SPACE\0"
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"END_SPACE\0"
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"SUPERSCRIPT_X\0"
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"SUPERSCRIPT_Y\0"
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"SUBSCRIPT_X\0"
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"SUBSCRIPT_Y\0"
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"UNDERLINE_POSITION\0"
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"UNDERLINE_THICKNESS\0"
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"STRIKEOUT_ASCENT\0"
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"STRIKEOUT_DESCENT\0"
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"ITALIC_ANGLE\0"
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"X_HEIGHT\0"
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"QUAD_WIDTH\0"
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"WEIGHT\0"
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"POINT_SIZE\0"
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"RESOLUTION\0"
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"COPYRIGHT\0"
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"NOTICE\0"
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"FONT_NAME\0"
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"FAMILY_NAME\0"
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"FULL_NAME\0"
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"CAP_HEIGHT\0"
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"WM_CLASS\0"
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"WM_TRANSIENT_FOR\0"
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"CLIPBOARD\0" /* = 69 */;
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static const gint xatoms_offset[] = {
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0, 5, 13, 23, 27, 32, 39, 48, 57, 64, 76, 88,
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100, 112, 124, 136, 148, 160, 169, 174, 182, 189, 195, 205,
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222, 236, 249, 262, 278, 291, 305, 317, 324, 333, 340, 351,
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360, 378, 391, 404, 412, 428, 442, 456, 466, 477, 487, 497,
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511, 525, 537, 549, 568, 588, 605, 623, 636, 645, 656, 663,
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674, 685, 695, 702, 712, 724, 734, 745, 754, 771
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};
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static void
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ensure_atom_tables (void)
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{
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int i;
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if (names_to_atoms)
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return;
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names_to_atoms = g_hash_table_new (g_str_hash, g_str_equal);
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atoms_to_names = g_ptr_array_sized_new (G_N_ELEMENTS (xatoms_offset));
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for (i = 0; i < G_N_ELEMENTS (xatoms_offset); i++)
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{
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g_hash_table_insert(names_to_atoms, (gchar *)xatoms_string + xatoms_offset[i], GINT_TO_POINTER (i));
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g_ptr_array_add(atoms_to_names, (gchar *)xatoms_string + xatoms_offset[i]);
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}
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}
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static GdkAtom
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intern_atom_internal (const gchar *atom_name, gboolean allocate)
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{
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gpointer result;
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gchar *name;
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ensure_atom_tables ();
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if (g_hash_table_lookup_extended (names_to_atoms, atom_name, NULL, &result))
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return result;
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result = GINT_TO_POINTER (atoms_to_names->len);
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name = allocate ? g_strdup (atom_name) : (gchar *)atom_name;
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g_hash_table_insert(names_to_atoms, name, result);
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g_ptr_array_add(atoms_to_names, name);
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return result;
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}
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/**
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* gdk_atom_intern:
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* @atom_name: a string.
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* @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
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* just return %GDK_NONE if the requested atom doesn’t already
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* exists. Currently, the flag is ignored, since checking the
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* existance of an atom is as expensive as creating it.
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*
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* Finds or creates an atom corresponding to a given string.
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*
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* Returns: (transfer none): the atom corresponding to @atom_name.
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*/
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GdkAtom
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gdk_atom_intern (const gchar *atom_name,
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gboolean only_if_exists)
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{
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g_return_val_if_fail (atom_name != NULL, GDK_NONE);
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return intern_atom_internal (atom_name, TRUE);
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}
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/**
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* gdk_atom_intern_static_string:
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* @atom_name: a static string
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*
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* Finds or creates an atom corresponding to a given string.
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*
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* Note that this function is identical to gdk_atom_intern() except
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* that if a new #GdkAtom is created the string itself is used rather
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* than a copy. This saves memory, but can only be used if the string
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* will always exist. It can be used with statically
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* allocated strings in the main program, but not with statically
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* allocated memory in dynamically loaded modules, if you expect to
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* ever unload the module again (e.g. do not use this function in
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* GTK+ theme engines).
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*
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* Returns: (transfer none): the atom corresponding to @atom_name
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*
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* Since: 2.10
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*/
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GdkAtom
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gdk_atom_intern_static_string (const gchar *atom_name)
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{
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g_return_val_if_fail (atom_name != NULL, GDK_NONE);
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return intern_atom_internal (atom_name, FALSE);
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}
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/**
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* gdk_atom_name:
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* @atom: a #GdkAtom.
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*
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* Determines the string corresponding to an atom.
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*
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* Returns: a newly-allocated string containing the string
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* corresponding to @atom. When you are done with the
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* return value, you should free it using g_free().
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*/
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gchar *
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gdk_atom_name (GdkAtom atom)
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{
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return g_strdup (_gdk_atom_name_const (atom));
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}
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const gchar *
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_gdk_atom_name_const (GdkAtom atom)
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{
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ensure_atom_tables ();
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if (GPOINTER_TO_INT (atom) >= atoms_to_names->len)
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return NULL;
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return g_ptr_array_index (atoms_to_names, GPOINTER_TO_INT (atom));
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}
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