![]() |
![]() |
![]() |
GTK+ Reference Manual | ![]() |
---|---|---|---|---|
#include <gtk/gtk.h> GtkSettings; GtkSettingsValue; GtkSettings* gtk_settings_get_default (void); GtkSettings* gtk_settings_get_for_screen (GdkScreen *screen); void gtk_settings_install_property (GParamSpec *pspec); void gtk_settings_install_property_parser (GParamSpec *pspec, GtkRcPropertyParser parser); gboolean gtk_rc_property_parse_color (const GParamSpec *pspec, const GString *gstring, GValue *property_value); gboolean gtk_rc_property_parse_enum (const GParamSpec *pspec, const GString *gstring, GValue *property_value); gboolean gtk_rc_property_parse_flags (const GParamSpec *pspec, const GString *gstring, GValue *property_value); gboolean gtk_rc_property_parse_requisition (const GParamSpec *pspec, const GString *gstring, GValue *property_value); gboolean gtk_rc_property_parse_border (const GParamSpec *pspec, const GString *gstring, GValue *property_value); void gtk_settings_set_property_value (GtkSettings *settings, const gchar *name, const GtkSettingsValue *svalue); void gtk_settings_set_string_property (GtkSettings *settings, const gchar *name, const gchar *v_string, const gchar *origin); void gtk_settings_set_long_property (GtkSettings *settings, const gchar *name, glong v_long, const gchar *origin); void gtk_settings_set_double_property (GtkSettings *settings, const gchar *name, gdouble v_double, const gchar *origin);
"color-hash" GHashTable* : Read "gtk-alternative-button-order" gboolean : Read / Write "gtk-alternative-sort-arrows" gboolean : Read / Write "gtk-button-images" gboolean : Read / Write "gtk-can-change-accels" gboolean : Read / Write "gtk-color-palette" gchar* : Read / Write "gtk-color-scheme" gchar* : Read / Write "gtk-cursor-blink" gboolean : Read / Write "gtk-cursor-blink-time" gint : Read / Write "gtk-cursor-blink-timeout" gint : Read / Write "gtk-cursor-theme-name" gchar* : Read / Write "gtk-cursor-theme-size" gint : Read / Write "gtk-dnd-drag-threshold" gint : Read / Write "gtk-double-click-distance" gint : Read / Write "gtk-double-click-time" gint : Read / Write "gtk-enable-accels" gboolean : Read / Write "gtk-enable-animations" gboolean : Read / Write "gtk-enable-event-sounds" gboolean : Read / Write "gtk-enable-input-feedback-sounds" gboolean : Read / Write "gtk-enable-mnemonics" gboolean : Read / Write "gtk-enable-tooltips" gboolean : Read / Write "gtk-entry-password-hint-timeout" guint : Read / Write "gtk-entry-select-on-focus" gboolean : Read / Write "gtk-error-bell" gboolean : Read / Write "gtk-fallback-icon-theme" gchar* : Read / Write "gtk-file-chooser-backend" gchar* : Read / Write "gtk-font-name" gchar* : Read / Write "gtk-fontconfig-timestamp" gint : Read / Write "gtk-icon-sizes" gchar* : Read / Write "gtk-icon-theme-name" gchar* : Read / Write "gtk-im-module" gchar* : Read / Write "gtk-key-theme-name" gchar* : Read / Write "gtk-keynav-cursor-only" gboolean : Read / Write "gtk-keynav-wrap-around" gboolean : Read / Write "gtk-label-select-on-focus" gboolean : Read / Write "gtk-menu-bar-accel" gchar* : Read / Write "gtk-menu-bar-popup-delay" gint : Read / Write "gtk-menu-images" gboolean : Read / Write "gtk-menu-popdown-delay" gint : Read / Write "gtk-menu-popup-click-time" gint : Read / Write "gtk-menu-popup-delay" gint : Read / Write "gtk-modules" gchar* : Read / Write "gtk-print-backends" gchar* : Read / Write "gtk-print-preview-command" gchar* : Read / Write "gtk-recent-files-limit" gint : Read / Write "gtk-recent-files-max-age" gint : Read / Write "gtk-scrolled-window-placement" GtkCornerType : Read / Write "gtk-show-input-method-menu" gboolean : Read / Write "gtk-show-unicode-menu" gboolean : Read / Write "gtk-sound-theme-name" gchar* : Read / Write "gtk-split-cursor" gboolean : Read / Write "gtk-theme-name" gchar* : Read / Write "gtk-timeout-expand" gint : Read / Write "gtk-timeout-initial" gint : Read / Write "gtk-timeout-repeat" gint : Read / Write "gtk-toolbar-icon-size" GtkIconSize : Read / Write "gtk-toolbar-style" GtkToolbarStyle : Read / Write "gtk-tooltip-browse-mode-timeout" gint : Read / Write "gtk-tooltip-browse-timeout" gint : Read / Write "gtk-tooltip-timeout" gint : Read / Write "gtk-touchscreen-mode" gboolean : Read / Write "gtk-xft-antialias" gint : Read / Write "gtk-xft-dpi" gint : Read / Write "gtk-xft-hinting" gint : Read / Write "gtk-xft-hintstyle" gchar* : Read / Write "gtk-xft-rgba" gchar* : Read / Write
typedef struct { /* origin should be something like "filename:linenumber" for rc files, * or e.g. "XProperty" for other sources */ gchar *origin; /* valid types are LONG, DOUBLE and STRING corresponding to the token parsed, * or a GSTRING holding an unparsed statement */ GValue value; } GtkSettingsValue;
GtkSettings* gtk_settings_get_default (void);
Gets the GtkSettings object for the default GDK screen, creating
it if necessary. See gtk_settings_get_for_screen()
.
Returns : | a GtkSettings object. If there is no default
screen, then returns NULL .
|
GtkSettings* gtk_settings_get_for_screen (GdkScreen *screen);
Gets the GtkSettings object for screen
, creating it if necessary.
screen : |
a GdkScreen. |
Returns : | a GtkSettings object. |
Since 2.2
void gtk_settings_install_property_parser (GParamSpec *pspec, GtkRcPropertyParser parser);
pspec : |
|
parser : |
gboolean gtk_rc_property_parse_color (const GParamSpec *pspec, const GString *gstring, GValue *property_value);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses a
color given either by its name or in the form
{ red, green, blue }
where red
, green
and
blue
are integers between 0 and 65535 or floating-point numbers
between 0 and 1.
pspec : |
a GParamSpec |
gstring : |
the GString to be parsed |
property_value : |
a GValue which must hold GdkColor values. |
Returns : | TRUE if gstring could be parsed and property_value
has been set to the resulting GdkColor.
|
gboolean gtk_rc_property_parse_enum (const GParamSpec *pspec, const GString *gstring, GValue *property_value);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses a single
enumeration value.
The enumeration value can be specified by its name, its nickname or its numeric value. For consistency with flags parsing, the value may be surrounded by parentheses.
pspec : |
a GParamSpec |
gstring : |
the GString to be parsed |
property_value : |
a GValue which must hold enum values. |
Returns : | TRUE if gstring could be parsed and property_value
has been set to the resulting GEnumValue.
|
gboolean gtk_rc_property_parse_flags (const GParamSpec *pspec, const GString *gstring, GValue *property_value);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses flags.
Flags can be specified by their name, their nickname or
numerically. Multiple flags can be specified in the form
"( flag1 | flag2 | ... )"
.
pspec : |
a GParamSpec |
gstring : |
the GString to be parsed |
property_value : |
a GValue which must hold flags values. |
Returns : | TRUE if gstring could be parsed and property_value
has been set to the resulting flags value.
|
gboolean gtk_rc_property_parse_requisition (const GParamSpec *pspec, const GString *gstring, GValue *property_value);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses a
requisition in the form
"{ width, height }"
for integers width
and height
.
pspec : |
a GParamSpec |
gstring : |
the GString to be parsed |
property_value : |
a GValue which must hold boxed values. |
Returns : | TRUE if gstring could be parsed and property_value
has been set to the resulting GtkRequisition.
|
gboolean gtk_rc_property_parse_border (const GParamSpec *pspec, const GString *gstring, GValue *property_value);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses
borders in the form
"{ left, right, top, bottom }"
for integers
left
, right
, top
and bottom
.
pspec : |
a GParamSpec |
gstring : |
the GString to be parsed |
property_value : |
a GValue which must hold boxed values. |
Returns : | TRUE if gstring could be parsed and property_value
has been set to the resulting GtkBorder.
|
void gtk_settings_set_property_value (GtkSettings *settings, const gchar *name, const GtkSettingsValue *svalue);
settings : |
|
name : |
|
svalue : |
void gtk_settings_set_string_property (GtkSettings *settings, const gchar *name, const gchar *v_string, const gchar *origin);
settings : |
|
name : |
|
v_string : |
|
origin : |
void gtk_settings_set_long_property (GtkSettings *settings, const gchar *name, glong v_long, const gchar *origin);
settings : |
|
name : |
|
v_long : |
|
origin : |
void gtk_settings_set_double_property (GtkSettings *settings, const gchar *name, gdouble v_double, const gchar *origin);
settings : |
|
name : |
|
v_double : |
|
origin : |
"color-hash"
property"color-hash" GHashTable* : Read
Holds a hash table representation of the "gtk-color-scheme" setting, mapping color names to GdkColors.
Since 2.10
"gtk-alternative-button-order"
property"gtk-alternative-button-order" gboolean : Read / Write
Whether buttons in dialogs should use the alternative button order.
Default value: FALSE
"gtk-alternative-sort-arrows"
property"gtk-alternative-sort-arrows" gboolean : Read / Write
Controls the direction of the sort indicators in sorted list and tree
views. By default an arrow pointing down means the column is sorted
in ascending order. When set to TRUE
, this order will be inverted.
Default value: FALSE
Since 2.12
"gtk-button-images"
property"gtk-button-images" gboolean : Read / Write
Whether images should be shown on buttons.
Default value: TRUE
"gtk-can-change-accels"
property"gtk-can-change-accels" gboolean : Read / Write
Whether menu accelerators can be changed by pressing a key over the menu item.
Default value: FALSE
"gtk-color-palette"
property"gtk-color-palette" gchar* : Read / Write
Palette to use in the color selector.
Default value: "black:white:gray50:red:purple:blue:light blue:green:yellow:orange:lavender:brown:goldenrod4:dodger blue:pink:light green:gray10:gray30:gray75:gray90"
"gtk-color-scheme"
property"gtk-color-scheme" gchar* : Read / Write
A palette of named colors for use in themes. The format of the string is
name1: color1 name2: color2 ...
Color names must be acceptable as identifiers in the
gtkrc syntax, and
color specifications must be in the format accepted by
gdk_color_parse()
.
Note that due to the way the color tables from different sources are merged, color specifications will be converted to hexadecimal form when getting this property.
Starting with GTK+ 2.12, the entries can alternatively be separated by ';' instead of newlines:
name1: color1; name2: color2; ...
Default value: ""
Since 2.10
"gtk-cursor-blink"
property"gtk-cursor-blink" gboolean : Read / Write
Whether the cursor should blink.
Also see the "gtk-cursor-blink-timeout" setting, which allows more flexible control over cursor blinking.
Default value: TRUE
"gtk-cursor-blink-time"
property"gtk-cursor-blink-time" gint : Read / Write
Length of the cursor blink cycle, in milliseconds.
Allowed values: >= 100
Default value: 1200
"gtk-cursor-blink-timeout"
property"gtk-cursor-blink-timeout" gint : Read / Write
Time after which the cursor stops blinking, in seconds. The timer is reset after each user interaction.
Setting this to zero has the same effect as setting
"gtk-cursor-blink" to FALSE
.
Allowed values: >= 1
Default value: 2147483647
Since 2.12
"gtk-cursor-theme-name"
property"gtk-cursor-theme-name" gchar* : Read / Write
Name of the cursor theme to use, or NULL to use the default theme.
Default value: NULL
"gtk-cursor-theme-size"
property"gtk-cursor-theme-size" gint : Read / Write
Size to use for cursors, or 0 to use the default size.
Allowed values: [0,128]
Default value: 0
"gtk-dnd-drag-threshold"
property"gtk-dnd-drag-threshold" gint : Read / Write
Number of pixels the cursor can move before dragging.
Allowed values: >= 1
Default value: 8
"gtk-double-click-distance"
property"gtk-double-click-distance" gint : Read / Write
Maximum distance allowed between two clicks for them to be considered a double click (in pixels).
Allowed values: >= 0
Default value: 5
"gtk-double-click-time"
property"gtk-double-click-time" gint : Read / Write
Maximum time allowed between two clicks for them to be considered a double click (in milliseconds).
Allowed values: >= 0
Default value: 250
"gtk-enable-accels"
property"gtk-enable-accels" gboolean : Read / Write
Whether menu items should have visible accelerators which can be activated.
Default value: TRUE
Since 2.12
"gtk-enable-animations"
property"gtk-enable-animations" gboolean : Read / Write
Whether to enable toolkit-wide animations.
Default value: TRUE
"gtk-enable-event-sounds"
property"gtk-enable-event-sounds" gboolean : Read / Write
Whether to play any event sounds at all.
See the Sound Theme spec for more information on event sounds and sound themes.
GTK+ itself does not support event sounds, you have to use a loadable module like the one that comes with libcanberra.
Default value: TRUE
Since 2.14
"gtk-enable-input-feedback-sounds"
property"gtk-enable-input-feedback-sounds" gboolean : Read / Write
Whether to play event sounds as feedback to user input.
See the Sound Theme spec for more information on event sounds and sound themes.
GTK+ itself does not support event sounds, you have to use a loadable module like the one that comes with libcanberra.
Default value: TRUE
Since 2.14
"gtk-enable-mnemonics"
property"gtk-enable-mnemonics" gboolean : Read / Write
Whether labels and menu items should have visible mnemonics which can be activated.
Default value: TRUE
Since 2.12
"gtk-enable-tooltips"
property"gtk-enable-tooltips" gboolean : Read / Write
Whether tooltips should be shown on widgets.
Default value: TRUE
Since 2.14
"gtk-entry-password-hint-timeout"
property"gtk-entry-password-hint-timeout" guint : Read / Write
How long to show the last input character in hidden entries. This value is in milliseconds. 0 disables showing the last char. 600 is a good value for enabling it.
Default value: 0
Since 2.10
"gtk-entry-select-on-focus"
property"gtk-entry-select-on-focus" gboolean : Read / Write
Whether to select the contents of an entry when it is focused.
Default value: TRUE
"gtk-error-bell"
property"gtk-error-bell" gboolean : Read / Write
When TRUE
, keyboard navigation and other input-related errors
will cause a beep. Since the error bell is implemented using
gdk_window_beep()
, the windowing system may offer ways to
configure the error bell in many ways, such as flashing the
window or similar visual effects.
Default value: TRUE
Since 2.12
"gtk-fallback-icon-theme"
property"gtk-fallback-icon-theme" gchar* : Read / Write
Name of a icon theme to fall back to.
Default value: NULL
"gtk-file-chooser-backend"
property"gtk-file-chooser-backend" gchar* : Read / Write
Name of the GtkFileChooser backend to use by default.
Default value: NULL
"gtk-font-name"
property"gtk-font-name" gchar* : Read / Write
Name of default font to use.
Default value: "Sans 10"
"gtk-fontconfig-timestamp"
property"gtk-fontconfig-timestamp" gint : Read / Write
Timestamp of current fontconfig configuration.
Default value: 0
"gtk-icon-sizes"
property"gtk-icon-sizes" gchar* : Read / Write
A list of icon sizes. The list is separated by colons, and item has the form:
size-name
= width
, height
E.g. "gtk-menu=16,16:gtk-button=20,20:gtk-dialog=48,48".
GTK+ itself use the following named icon sizes: gtk-menu,
gtk-button, gtk-small-toolbar, gtk-large-toolbar, gtk-dnd,
gtk-dialog. Applications can register their own named icon
sizes with gtk_icon_size_register()
.
Default value: NULL
"gtk-icon-theme-name"
property"gtk-icon-theme-name" gchar* : Read / Write
Name of icon theme to use.
Default value: "hicolor"
"gtk-im-module"
property"gtk-im-module" gchar* : Read / Write
Which IM module should be used by default.
Default value: NULL
"gtk-key-theme-name"
property"gtk-key-theme-name" gchar* : Read / Write
Name of key theme RC file to load.
Default value: NULL
"gtk-keynav-cursor-only"
property"gtk-keynav-cursor-only" gboolean : Read / Write
When TRUE
, keyboard navigation should be able to reach all widgets
by using the cursor keys only. Tab, Shift etc. keys can't be expected
to be present on the used input device.
Default value: FALSE
Since 2.12
"gtk-keynav-wrap-around"
property"gtk-keynav-wrap-around" gboolean : Read / Write
When TRUE
, some widgets will wrap around when doing keyboard
navigation, such as menus, menubars and notebooks.
Default value: TRUE
Since 2.12
"gtk-label-select-on-focus"
property"gtk-label-select-on-focus" gboolean : Read / Write
Whether to select the contents of a selectable label when it is focused.
Default value: TRUE
"gtk-menu-bar-accel"
property"gtk-menu-bar-accel" gchar* : Read / Write
Keybinding to activate the menu bar.
Default value: "F10"
"gtk-menu-bar-popup-delay"
property"gtk-menu-bar-popup-delay" gint : Read / Write
Delay before the submenus of a menu bar appear.
Allowed values: >= 0
Default value: 0
"gtk-menu-images"
property"gtk-menu-images" gboolean : Read / Write
Whether images should be shown in menus.
Default value: TRUE
"gtk-menu-popdown-delay"
property"gtk-menu-popdown-delay" gint : Read / Write
The time before hiding a submenu when the pointer is moving towards the submenu.
Allowed values: >= 0
Default value: 1000
"gtk-menu-popup-click-time"
property"gtk-menu-popup-click-time" gint : Read / Write
Maximum time allowed (in milliseconds) between button press and release for them to be considered part of a popup action instead of a (menu item) select action. 0 always considers the corresponding button release part of the popup click and always keeps the menu open unless an item was activated.
Allowed values: >= 0
Default value: 500
"gtk-menu-popup-delay"
property"gtk-menu-popup-delay" gint : Read / Write
Minimum time the pointer must stay over a menu item before the submenu appear.
Allowed values: >= 0
Default value: 225
"gtk-modules"
property"gtk-modules" gchar* : Read / Write
List of currently active GTK modules.
Default value: NULL
"gtk-print-backends"
property"gtk-print-backends" gchar* : Read / Write
A comma-separated list of print backends to use in the print dialog. Available print backends depend on the GTK+ installation, and may include "pdf", "cups" or "lpr".
Default value: "file,lpr"
Since 2.10
"gtk-print-preview-command"
property"gtk-print-preview-command" gchar* : Read / Write
A command to run for displaying the print preview. The command
should contain a f
placeholder, which will get replaced by
the path to the pdf file. The command may also contain a s
placeholder, which will get replaced by the path to a file
containing the print settings in the format produced by
gtk_print_settings_to_file()
.
The preview application is responsible for removing the pdf file and the print settings file when it is done.
Default value: "evince --unlink-tempfile --preview --print-settings %s %f"
Since 2.10
"gtk-recent-files-limit"
property"gtk-recent-files-limit" gint : Read / Write
The number of recently used files that should be displayed by default by GtkRecentChooser implementations and by the GtkFileChooser. A value of -1 means every recently used file stored.
Allowed values: >= -1
Default value: 50
Since 2.12
"gtk-recent-files-max-age"
property"gtk-recent-files-max-age" gint : Read / Write
The maximum age, in days, of the items inside the recently used resources list. Items older than this setting will be excised from the list. If set to 0, the list will always be empty; if set to -1, no item will be removed.
Allowed values: >= -1
Default value: 30
Since 2.14
"gtk-scrolled-window-placement"
property"gtk-scrolled-window-placement" GtkCornerType : Read / Write
Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement.
Default value: GTK_CORNER_TOP_LEFT
Since 2.10
"gtk-show-input-method-menu"
property"gtk-show-input-method-menu" gboolean : Read / Write
Whether the context menus of entries and text views should offer to change the input method.
Default value: TRUE
"gtk-show-unicode-menu"
property"gtk-show-unicode-menu" gboolean : Read / Write
Whether the context menus of entries and text views should offer to insert control characters.
Default value: TRUE
"gtk-sound-theme-name"
property"gtk-sound-theme-name" gchar* : Read / Write
The XDG sound theme to use for event sounds.
See the Sound Theme spec for more information on event sounds and sound themes.
GTK+ itself does not support event sounds, you have to use a loadable module like the one that comes with libcanberra.
Default value: "freedesktop"
Since 2.14
"gtk-split-cursor"
property"gtk-split-cursor" gboolean : Read / Write
Whether two cursors should be displayed for mixed left-to-right and right-to-left text.
Default value: TRUE
"gtk-theme-name"
property"gtk-theme-name" gchar* : Read / Write
Name of theme RC file to load.
Default value: "Raleigh"
"gtk-timeout-expand"
property"gtk-timeout-expand" gint : Read / Write
Expand value for timeouts, when a widget is expanding a new region.
Allowed values: >= 0
Default value: 500
"gtk-timeout-initial"
property"gtk-timeout-initial" gint : Read / Write
Starting value for timeouts, when button is pressed.
Allowed values: >= 0
Default value: 200
"gtk-timeout-repeat"
property"gtk-timeout-repeat" gint : Read / Write
Repeat value for timeouts, when button is pressed.
Allowed values: >= 0
Default value: 20
"gtk-toolbar-icon-size"
property"gtk-toolbar-icon-size" GtkIconSize : Read / Write
Size of icons in default toolbars.
Default value: GTK_ICON_SIZE_LARGE_TOOLBAR
"gtk-toolbar-style"
property"gtk-toolbar-style" GtkToolbarStyle : Read / Write
Whether default toolbars have text only, text and icons, icons only, etc.
Default value: GTK_TOOLBAR_BOTH
"gtk-tooltip-browse-mode-timeout"
property"gtk-tooltip-browse-mode-timeout" gint : Read / Write
Amount of time, in milliseconds, after which the browse mode will be disabled.
See "gtk-tooltip-browse-timeout" for more information about browse mode.
Allowed values: >= 0
Default value: 500
Since 2.12
"gtk-tooltip-browse-timeout"
property"gtk-tooltip-browse-timeout" gint : Read / Write
Controls the time after which tooltips will appear when browse mode is enabled, in milliseconds.
Browse mode is enabled when the mouse pointer moves off an object where a tooltip was currently being displayed. If the mouse pointer hits another object before the browse mode timeout expires (see "gtk-tooltip-browse-mode-timeout"), it will take the amount of milliseconds specified by this setting to popup the tooltip for the new object.
Allowed values: >= 0
Default value: 60
Since 2.12
"gtk-tooltip-timeout"
property"gtk-tooltip-timeout" gint : Read / Write
Time, in milliseconds, after which a tooltip could appear if the cursor is hovering on top of a widget.
Allowed values: >= 0
Default value: 500
Since 2.12
"gtk-touchscreen-mode"
property"gtk-touchscreen-mode" gboolean : Read / Write
When TRUE
, there are no motion notify events delivered on this screen,
and widgets can't use the pointer hovering them for any essential
functionality.
Default value: FALSE
Since 2.10
"gtk-xft-antialias"
property"gtk-xft-antialias" gint : Read / Write
Whether to antialias Xft fonts; 0=no, 1=yes, -1=default.
Allowed values: [-1,1]
Default value: -1
"gtk-xft-dpi"
property"gtk-xft-dpi" gint : Read / Write
Resolution for Xft, in 1024 * dots/inch. -1 to use default value.
Allowed values: [-1,1048576]
Default value: -1
"gtk-xft-hinting"
property"gtk-xft-hinting" gint : Read / Write
Whether to hint Xft fonts; 0=no, 1=yes, -1=default.
Allowed values: [-1,1]
Default value: -1
"gtk-xft-hintstyle"
property"gtk-xft-hintstyle" gchar* : Read / Write
What degree of hinting to use; hintnone, hintslight, hintmedium, or hintfull.
Default value: NULL
"gtk-xft-rgba"
property"gtk-xft-rgba" gchar* : Read / Write
Type of subpixel antialiasing; none, rgb, bgr, vrgb, vbgr.
Default value: NULL