AuroraMiddleware/gtk2
1
0
Fork 0
forked from AuroraMiddleware/gtk
Code Issues Pull Requests Projects Releases Wiki Activity

Merge in Gdk-custom.c introspection annotations

Browse Source 
The Gdk-custom.c file in gir-repository contained a number of
introspection annotations.  Merge those into the GDK source files.

Some documentation was moved from the tmpl/ files to accomodate
the addition of annotations.

https://bugzilla.gnome.org/show_bug.cgi?id=592279
This commit is contained in:
Colin Walters 2009-08-18 14:35:10 -04:00 committed by Johan Dahlin
parent 78758d43ea
commit 18dc96caf8
20 changed files with 173 additions and 144 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
docs/reference/gdk/tmpl/input_devices.sgml
View File

@ -228,15 +228,11 @@ Specifies how an axis of a device is used.
<!-- ##### FUNCTION gdk_device_get_state ##### -->
<para>
Gets the current state of a device.
</para>
@device: a #GdkDevice.
@window: a #GdkWindow.
@axes: an array of doubles to store the values of the axes of @device in,
or %NULL.
@mask: location to store the modifiers, or %NULL.
@device:
@window:
@axes:
@mask:
<!-- ##### FUNCTION gdk_device_get_history ##### -->

61
docs/reference/gdk/tmpl/pixmaps.sgml
View File

@ -77,76 +77,15 @@ for the new pixmap. Can be %NULL, if the depth is given.
<!-- ##### FUNCTION gdk_pixmap_create_from_xpm ##### -->
<para>
Create a pixmap from a XPM file.
</para>
@drawable: a #GdkDrawable, used to determine default values
for the new pixmap.
@mask: a pointer to a place to store a bitmap representing
the transparency mask of the XPM file. Can be %NULL,
in which case transparency will be ignored.
@transparent_color: the color to be used for the pixels
that are transparent in the input file. Can be %NULL,
in which case a default color will be used.
@filename: the filename of a file containing XPM data.
@Returns: the #GdkPixmap
<!-- ##### FUNCTION gdk_pixmap_colormap_create_from_xpm ##### -->
<para>
Create a pixmap from a XPM file using a particular colormap.
</para>
@drawable: a #GdkDrawable, used to determine default values
for the new pixmap. Can be %NULL if @colormap is given.
@colormap: the #GdkColormap that the new pixmap will be use.
If omitted, the colormap for @window will be used.
@mask: a pointer to a place to store a bitmap representing
the transparency mask of the XPM file. Can be %NULL,
in which case transparency will be ignored.
@transparent_color: the color to be used for the pixels
that are transparent in the input file. Can be %NULL,
in which case a default color will be used.
@filename: the filename of a file containing XPM data.
@Returns: the #GdkPixmap.
<!-- ##### FUNCTION gdk_pixmap_create_from_xpm_d ##### -->
<para>
Create a pixmap from data in XPM format.
</para>
@drawable: a #GdkDrawable, used to determine default values
for the new pixmap.
@mask: Pointer to a place to store a bitmap representing
the transparency mask of the XPM file. Can be %NULL,
in which case transparency will be ignored.
@transparent_color: This color will be used for the pixels
that are transparent in the input file. Can be %NULL
in which case a default color will be used.
@data: Pointer to a string containing the XPM data.
@Returns: the #GdkPixmap
<!-- ##### FUNCTION gdk_pixmap_colormap_create_from_xpm_d ##### -->
<para>
Create a pixmap from data in XPM format using a particular
colormap.
</para>
@drawable: a #GdkDrawable, used to determine default values
for the new pixmap. Can be %NULL if @colormap is given.
@colormap: the #GdkColormap that the new pixmap will be use.
If omitted, the colormap for @window will be used.
@mask: a pointer to a place to store a bitmap representing
the transparency mask of the XPM file. Can be %NULL,
in which case transparency will be ignored.
@transparent_color: the color to be used for the pixels
that are transparent in the input file. Can be %NULL,
in which case a default color will be used.
@data: Pointer to a string containing the XPM data.
@Returns: the #GdkPixmap.
<!-- ##### MACRO gdk_pixmap_ref ##### -->

14
gdk/gdk.c
View File

@ -338,9 +338,10 @@ gdk_display_open_default_libgtk_only (void)
return display;
}
/*
*--------------------------------------------------------------
* gdk_init_check
/**
* gdk_init_check:
* @argc: (inout):
* @argv: (array length=argc) (inout):
*
* Initialize the library for use.
*
@ -359,7 +360,6 @@ gdk_display_open_default_libgtk_only (void)
*
*--------------------------------------------------------------
*/
gboolean
gdk_init_check (int *argc,
char ***argv)
@ -369,6 +369,12 @@ gdk_init_check (int *argc,
return gdk_display_open_default_libgtk_only () != NULL;
}
/**
* gdk_init:
* @argc: (inout):
* @argv: (array length=argc) (inout):
*/
void
gdk_init (int *argc, char ***argv)
{

4
gdk/gdkcolor.c
View File

@ -318,8 +318,8 @@ gdk_color_get_type (void)
/**
* gdk_color_parse:
* @spec: the string specifying the color.
* @color: the #GdkColor to fill in
*
* @color: (out): the #GdkColor to fill in
*
* Parses a textual specification of a color and fill in the
* <structfield>red</structfield>, <structfield>green</structfield>,
* and <structfield>blue</structfield> fields of a #GdkColor

22
gdk/gdkdisplay.c
View File

@ -466,12 +466,12 @@ _gdk_display_enable_motion_hints (GdkDisplay *display)
/**
* gdk_display_get_pointer:
* @display: a #GdkDisplay
* @screen: location to store the screen that the
* @screen: (allow-none): location to store the screen that the
* cursor is on, or %NULL.
* @x: location to store root window X coordinate of pointer, or %NULL.
* @y: location to store root window Y coordinate of pointer, or %NULL.
* @mask: location to store current modifier mask, or %NULL
*
* @x: (out): location to store root window X coordinate of pointer, or %NULL.
* @y: (out): location to store root window Y coordinate of pointer, or %NULL.
* @mask: (out): location to store current modifier mask, or %NULL
*
* Gets the current location of the pointer and the current modifier
* mask for a given display.
*
@ -567,17 +567,17 @@ gdk_window_real_window_get_pointer (GdkDisplay *display,
/**
* gdk_display_get_window_at_pointer:
* @display: a #GdkDisplay
* @win_x: return location for x coordinate of the pointer location relative
* @win_x: (out) (allow-none): return location for x coordinate of the pointer location relative
* to the window origin, or %NULL
* @win_y: return location for y coordinate of the pointer location relative
* @win_y: (out) (allow-none): return location for y coordinate of the pointer location relative
& to the window origin, or %NULL
*
*
* Obtains the window underneath the mouse pointer, returning the location
* of the pointer in that window in @win_x, @win_y for @screen. Returns %NULL
* of the pointer in that window in @win_x, @win_y for @screen. Returns %NULL
* if the window under the mouse pointer is not known to GDK (for example,
* belongs to another application).
*
* Returns: the window under the mouse pointer, or %NULL
*
* Returns: (transfer none): the window under the mouse pointer, or %NULL
*
* Since: 2.2
**/

21
gdk/gdkdisplaymanager.c
View File

@ -147,11 +147,12 @@ gdk_display_manager_get_property (GObject *object,
}
}
/**
/**
* gdk_display_manager_get:
* @returns: the singleton #GdkDisplayManager object.
*
* Returns the global #GdkDisplayManager singleton; gdk_parse_pargs(),
* Gets the singleton #GdkDisplayManager object.
*
* Returns: (transfer none): The global #GdkDisplayManager singleton; gdk_parse_pargs(),
* gdk_init(), or gdk_init_check() must have been called first.
*
* Since: 2.2
@ -171,9 +172,9 @@ gdk_display_manager_get (void)
* gdk_display_manager_get_default_display:
* @display_manager: a #GdkDisplayManager
*
* Gets the default #GdkDisplay.
*
* Returns: a #GdkDisplay, or %NULL if there is no default
* Gets the default #GdkDisplay.
*
* Returns: (transfer none): a #GdkDisplay, or %NULL if there is no default
* display.
*
* Since: 2.2
@ -190,8 +191,8 @@ gdk_display_manager_get_default_display (GdkDisplayManager *display_manager)
* Gets the default #GdkDisplay. This is a convenience
* function for
* <literal>gdk_display_manager_get_default_display (gdk_display_manager_get ())</literal>.
*
* Returns: a #GdkDisplay, or %NULL if there is no default
*
* Returns: (transfer none): a #GdkDisplay, or %NULL if there is no default
* display.
*
* Since: 2.2
@ -207,8 +208,8 @@ gdk_display_get_default (void)
*
* Gets the default screen for the default display. (See
* gdk_display_get_default ()).
*
* Returns: a #GdkScreen, or %NULL if there is no default display.
*
* Returns: (transfer none): a #GdkScreen, or %NULL if there is no default display.
*
* Since: 2.2
*/

8
gdk/gdkdnd.c
View File

@ -37,11 +37,11 @@
* should be ignored, since it is put up by the drag source as an icon.
* @x_root: the x position of the pointer in root coordinates.
* @y_root: the y position of the pointer in root coordinates.
* @dest_window: location to store the destination window in.
* @protocol: location to store the DND protocol in.
*
* @dest_window: (out): location to store the destination window in.
* @protocol: (out): location to store the DND protocol in.
*
* Finds the destination window and DND protocol to use at the
* given pointer position.
* given pointer position.
*
* This function is called by the drag source to obtain the
* @dest_window and @protocol parameters for gdk_drag_motion().

6
gdk/gdkdraw.c
View File

@ -142,12 +142,12 @@ gdk_drawable_get_data (GdkDrawable *drawable,
/**
* gdk_drawable_get_size:
* @drawable: a #GdkDrawable
* @width: location to store drawable's width, or %NULL
* @height: location to store drawable's height, or %NULL
* @width: (out): location to store drawable's width, or %NULL
* @height: (out): location to store drawable's height, or %NULL
*
* Fills *@width and *@height with the size of @drawable.
* @width or @height can be %NULL if you only want the other one.
*
*
* On the X11 platform, if @drawable is a #GdkWindow, the returned
* size is the size reported in the most-recently-processed configure
* event, rather than the current size on the X server.

3
gdk/gdkinput.h
View File

@ -145,16 +145,19 @@ void gdk_device_set_key (GdkDevice *device,
void gdk_device_set_axis_use (GdkDevice *device,
guint index_,
GdkAxisUse use);
void gdk_device_get_state (GdkDevice *device,
GdkWindow *window,
gdouble *axes,
GdkModifierType *mask);
gboolean gdk_device_get_history (GdkDevice *device,
GdkWindow *window,
guint32 start,
guint32 stop,
GdkTimeCoord ***events,
gint *n_events);
void gdk_device_free_history (GdkTimeCoord **events,
gint n_events);
gboolean gdk_device_get_axis (GdkDevice *device,

6
gdk/gdkkeys.c
View File

@ -121,12 +121,12 @@ gdk_keymap_init (GdkKeymap *keymap)
/**
* gdk_keyval_convert_case:
* @symbol: a keyval
* @lower: return location for lowercase version of @symbol
* @upper: return location for uppercase version of @symbol
* @lower: (out): return location for lowercase version of @symbol
* @upper: (out): return location for uppercase version of @symbol
*
* Obtains the upper- and lower-case versions of the keyval @symbol.
* Examples of keyvals are #GDK_a, #GDK_Enter, #GDK_F1, etc.
*
*
**/
void
gdk_keyval_convert_case (guint symbol,

67
gdk/gdkpixmap.c
View File

@ -672,6 +672,24 @@ gdk_pixmap_colormap_new_from_pixbuf (GdkColormap *colormap,
return pixmap;
}
/**
* gdk_pixmap_colormap_create_from_xpm:
* @drawable: a #GdkDrawable, used to determine default values
* for the new pixmap. Can be %NULL if @colormap is given.
* @colormap: the #GdkColormap that the new pixmap will be use.
* If omitted, the colormap for @window will be used.
* @mask: a pointer to a place to store a bitmap representing
* the transparency mask of the XPM file. Can be %NULL,
* in which case transparency will be ignored.
* @transparent_color: the color to be used for the pixels
* that are transparent in the input file. Can be %NULL,
* in which case a default color will be used.
* @filename: the filename of a file containing XPM data.
*
* Create a pixmap from a XPM file using a particular colormap.
*
* Returns: (transfer none): the #GdkPixmap.
*/
GdkPixmap*
gdk_pixmap_colormap_create_from_xpm (GdkDrawable *drawable,
GdkColormap *colormap,
@ -700,6 +718,22 @@ gdk_pixmap_colormap_create_from_xpm (GdkDrawable *drawable,
return pixmap;
}
/**
* gdk_pixmap_create_from_xpm:
* @drawable: a #GdkDrawable, used to determine default values
* for the new pixmap.
* @mask: (out) a pointer to a place to store a bitmap representing
* the transparency mask of the XPM file. Can be %NULL,
* in which case transparency will be ignored.
* @transparent_color: the color to be used for the pixels
* that are transparent in the input file. Can be %NULL,
* in which case a default color will be used.
* @filename: the filename of a file containing XPM data.
*
* Create a pixmap from a XPM file.
*
* Returns: (transfer none): the #GdkPixmap
*/
GdkPixmap*
gdk_pixmap_create_from_xpm (GdkDrawable *drawable,
GdkBitmap **mask,
@ -710,6 +744,23 @@ gdk_pixmap_create_from_xpm (GdkDrawable *drawable,
transparent_color, filename);
}
/**
* gdk_pixmap_colormap_create_from_xpm_d:
* @drawable: a #GdkDrawable, used to determine default values
* for the new pixmap. Can be %NULL if @colormap is given.
* @colormap: the #GdkColormap that the new pixmap will be use.
* If omitted, the colormap for @window will be used.
* @mask: a pointer to a place to store a bitmap representing
* the transparency mask of the XPM file. Can be %NULL,
* in which case transparency will be ignored.
* @transparent_color: the color to be used for the pixels
* that are transparent in the input file. Can be %NULL,
* in which case a default color will be used.
* @data: Pointer to a string containing the XPM data.
*
* Create a pixmap from data in XPM format using a particular
* colormap.
*/
GdkPixmap*
gdk_pixmap_colormap_create_from_xpm_d (GdkDrawable *drawable,
GdkColormap *colormap,
@ -738,6 +789,22 @@ gdk_pixmap_colormap_create_from_xpm_d (GdkDrawable *drawable,
return pixmap;
}
/**
* gdk_pixmap_create_from_xpm_d:
* @drawable: a #GdkDrawable, used to determine default values
* for the new pixmap.
* @mask: (out): Pointer to a place to store a bitmap representing
* the transparency mask of the XPM file. Can be %NULL,
* in which case transparency will be ignored.
* @transparent_color: This color will be used for the pixels
* that are transparent in the input file. Can be %NULL
* in which case a default color will be used.
* @data: Pointer to a string containing the XPM data.
*
* Create a pixmap from data in XPM format.
*
* Returns: (transfer none): the #GdkPixmap.
*/
GdkPixmap*
gdk_pixmap_create_from_xpm_d (GdkDrawable *drawable,
GdkBitmap **mask,

2
gdk/gdkregion-generic.c
View File

@ -226,7 +226,7 @@ gdk_region_get_clipbox (const GdkRegion *region,
/**
* gdk_region_get_rectangles:
* @region: a #GdkRegion
* @rectangles: return location for an array of rectangles
* @rectangles: (array length=n_rectangles) (transfer container): return location for an array of rectangles
* @n_rectangles: length of returned array
*
* Obtains the area covered by the region as a list of rectangles.

24
gdk/gdkwindow.c
View File

@ -1256,7 +1256,7 @@ sync_native_window_stack_position (GdkWindow *window)
/**
* gdk_window_new:
* @parent: a #GdkWindow, or %NULL to create the window as a child of
* @parent: (allow-none): a #GdkWindow, or %NULL to create the window as a child of
* the default root window for the default display.
* @attributes: attributes of the new window
* @attributes_mask: mask indicating which fields in @attributes are valid
@ -1266,7 +1266,7 @@ sync_native_window_stack_position (GdkWindow *window)
* more details. Note: to use this on displays other than the default
* display, @parent must be specified.
*
* Return value: the new #GdkWindow
* Return value: (transfer none): the new #GdkWindow
**/
GdkWindow*
gdk_window_new (GdkWindow *parent,
@ -3456,12 +3456,12 @@ gdk_window_get_offsets (GdkWindow *window,
/**
* gdk_window_get_internal_paint_info:
* @window: a #GdkWindow
* @real_drawable: location to store the drawable to which drawing should be
* @real_drawable: (out): location to store the drawable to which drawing should be
* done.
* @x_offset: location to store the X offset between coordinates in @window,
* @x_offset: (out): location to store the X offset between coordinates in @window,
* and the underlying window system primitive coordinates for
* *@real_drawable.
* @y_offset: location to store the Y offset between coordinates in @window,
* @y_offset: (out): location to store the Y offset between coordinates in @window,
* and the underlying window system primitive coordinates for
* *@real_drawable.
*
@ -6199,18 +6199,18 @@ gdk_window_constrain_size (GdkGeometry *geometry,
/**
* gdk_window_get_pointer:
* @window: a #GdkWindow
* @x: return location for X coordinate of pointer or %NULL to not
* @x: (out) (allow-none): return location for X coordinate of pointer or %NULL to not
* return the X coordinate
* @y: return location for Y coordinate of pointer or %NULL to not
* @y: (out) (allow-none): return location for Y coordinate of pointer or %NULL to not
* return the Y coordinate
* @mask: return location for modifier mask or %NULL to not return the
* @mask: (out) (allow-none): return location for modifier mask or %NULL to not return the
* modifier mask
*
* Obtains the current pointer position and modifier state.
* The position is given in coordinates relative to the upper left
* corner of @window.
*
* Return value: the window containing the pointer (as with
* Return value: (transfer none): the window containing the pointer (as with
* gdk_window_at_pointer()), or %NULL if the window containing the
* pointer isn't known to GDK
**/
@ -6259,8 +6259,8 @@ gdk_window_get_pointer (GdkWindow *window,
/**
* gdk_window_at_pointer:
* @win_x: return location for origin of the window under the pointer
* @win_y: return location for origin of the window under the pointer
* @win_x: (out) (allow-none): return location for origin of the window under the pointer
* @win_y: (out) (allow-none): return location for origin of the window under the pointer
*
* Obtains the window underneath the mouse pointer, returning the
* location of that window in @win_x, @win_y. Returns %NULL if the
@ -6271,7 +6271,7 @@ gdk_window_get_pointer (GdkWindow *window,
* NOTE: For multihead-aware widgets or applications use
* gdk_display_get_window_at_pointer() instead.
*
* Return value: window under the mouse pointer
* Return value: (transfer none): window under the mouse pointer
**/
GdkWindow*
gdk_window_at_pointer (gint *win_x,

4
gdk/x11/gdkcursor-x11.c
View File

@ -1035,8 +1035,8 @@ gdk_display_get_default_cursor_size (GdkDisplay *display)
/**
* gdk_display_get_maximal_cursor_size:
* @display: a #GdkDisplay
* @width: the return location for the maximal cursor width
* @height: the return location for the maximal cursor height
* @width: (out): the return location for the maximal cursor width
* @height: (out): the return location for the maximal cursor height
*
* Gets the maximal size to use for cursors on @display.
*

8
gdk/x11/gdkdnd-x11.c
View File

@ -3170,11 +3170,11 @@ drag_context_find_window_cache (GdkDragContext *context,
* @screen: the screen where the destination window is sought.
* @x_root: the x position of the pointer in root coordinates.
* @y_root: the y position of the pointer in root coordinates.
* @dest_window: location to store the destination window in.
* @protocol: location to store the DND protocol in.
*
* @dest_window: (out): location to store the destination window in.
* @protocol: (out): location to store the DND protocol in.
*
* Finds the destination window and DND protocol to use at the
* given pointer position.
* given pointer position.
*
* This function is called by the drag source to obtain the
* @dest_window and @protocol parameters for gdk_drag_motion().

10
gdk/x11/gdkinput-x11.c
View File

@ -858,6 +858,16 @@ _gdk_device_get_history (GdkDevice *device,
return FALSE;
}
/**
* gdk_device_get_state:
* @device: a #GdkDevice.
* @window: a #GdkWindow.
* @axes: an array of doubles to store the values of the axes of @device in,
* or %NULL.
* @mask: location to store the modifiers, or %NULL.
*
* Gets the current state of a device.
*/
void
gdk_device_get_state (GdkDevice *device,
GdkWindow *window,

9
gdk/x11/gdkinput.c
View File

@ -243,7 +243,7 @@ impl_coord_in_window (GdkWindow *window,
* @window: the window with respect to which which the event coordinates will be reported
* @start: starting timestamp for range of events to return
* @stop: ending timestamp for the range of events to return
* @events: location to store a newly-allocated array of #GdkTimeCoord, or %NULL
* @events: (array length=n_events) (out) (transfer none): location to store a newly-allocated array of #GdkTimeCoord, or %NULL
* @n_events: location to store the length of @events, or %NULL
*
* Obtains the motion history for a device; given a starting and
@ -351,6 +351,13 @@ _gdk_device_allocate_history (GdkDevice *device,
return result;
}
/**
* gdk_device_free_history:
* @events: (inout) (transfer none): an array of #GdkTimeCoord.
* @n_events: the length of the array.
*
* Frees an array of #GdkTimeCoord that was returned by gdk_device_get_history().
*/
void
gdk_device_free_history (GdkTimeCoord **events,
gint n_events)

26
gdk/x11/gdkkeys-x11.c
View File

@ -834,11 +834,11 @@ gdk_keymap_get_caps_lock_state (GdkKeymap *keymap)
/**
* gdk_keymap_get_entries_for_keyval:
* @keymap: a #GdkKeymap, or %NULL to use the default keymap
* @keymap: (allow-none): a #GdkKeymap, or %NULL to use the default keymap
* @keyval: a keyval, such as %GDK_a, %GDK_Up, %GDK_Return, etc.
* @keys: return location for an array of #GdkKeymapKey
* @n_keys: return location for number of elements in returned array
*
* @keys: (out): return location for an array of #GdkKeymapKey
* @n_keys: (out): return location for number of elements in returned array
*
* Obtains a list of keycode/group/level combinations that will
* generate @keyval. Groups and levels are two kinds of keyboard mode;
* in general, the level determines whether the top or bottom symbol
@ -984,10 +984,10 @@ gdk_keymap_get_entries_for_keyval (GdkKeymap *keymap,
/**
* gdk_keymap_get_entries_for_keycode:
* @keymap: a #GdkKeymap or %NULL to use the default keymap
* @keymap: (allow-none): a #GdkKeymap or %NULL to use the default keymap
* @hardware_keycode: a keycode
* @keys: return location for array of #GdkKeymapKey, or %NULL
* @keyvals: return location for array of keyvals, or %NULL
* @keys: (out): return location for array of #GdkKeymapKey, or %NULL
* @keyvals: (out): return location for array of keyvals, or %NULL
* @n_entries: length of @keys and @keyvals
*
* Returns the keyvals bound to @hardware_keycode.
@ -1409,14 +1409,14 @@ translate_keysym (GdkKeymapX11 *keymap_x11,
/**
* gdk_keymap_translate_keyboard_state:
* @keymap: a #GdkKeymap, or %NULL to use the default
* @keymap: (allow-none): a #GdkKeymap, or %NULL to use the default
* @hardware_keycode: a keycode
* @state: a modifier state
* @state: a modifier state
* @group: active keyboard group
* @keyval: return location for keyval, or %NULL
* @effective_group: return location for effective group, or %NULL
* @level: return location for level, or %NULL
* @consumed_modifiers: return location for modifiers that were used to
* @keyval: (out) (allow-none): return location for keyval, or %NULL
* @effective_group: (out) (allow-none): return location for effective group, or %NULL
* @level: (out) (allow-none): return location for level, or %NULL
* @consumed_modifiers: (out) (allow-none): return location for modifiers that were used to
* determine the group or level, or %NULL
*
* Translates the contents of a #GdkEventKey into a keyval, effective

6
gdk/x11/gdkscreen-x11.c
View File

@ -214,9 +214,9 @@ gdk_screen_get_number (GdkScreen *screen)
* gdk_screen_get_root_window:
* @screen: a #GdkScreen
*
* Gets the root window of @screen.
*
* Returns: the root window
* Gets the root window of @screen.
*
* Returns: (transfer none): the root window
*
* Since: 2.2
**/

4
gdk/x11/gdkvisual-x11.c
View File

@ -466,8 +466,8 @@ gdk_visual_get_best_with_both (gint depth,
/**
* gdk_query_depths:
* @depths: return location for available depths
* @count: return location for number of available depths
* @depths: (out) (array): return location for available depths
* @count: (out): return location for number of available depths
*
* This function returns the available bit depths for the default
* screen. It's equivalent to listing the visuals