gtk2/gdk/win32/gdkvisual-win32.c

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <stdlib.h>
#include "gdkvisual.h"
#include "gdkprivate-win32.h"
static void gdk_visual_decompose_mask (gulong mask,
gint *shift,
gint *prec);
static GdkVisualPrivate *system_visual = NULL;
static gint available_depths[1];
static GdkVisualType available_types[1];
static void
gdk_visual_finalize (GObject *object)
{
g_error ("A GdkVisual object was finalized. This should not happen");
}
static void
gdk_visual_class_init (GObjectClass *class)
{
class->finalize = gdk_visual_finalize;
}
GType
gdk_visual_get_type (void)
{
static GType object_type = 0;
if (!object_type)
{
static const GTypeInfo object_info =
{
sizeof (GdkVisualClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gdk_visual_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GdkVisualPrivate),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
};
object_type = g_type_register_static (G_TYPE_OBJECT,
"GdkVisual",
&object_info, 0);
}
return object_type;
}
void
Make gdkx.h the only installed header from gdk/x11. All structures in Fri Sep 7 11:51:44 2001 Owen Taylor <otaylor@redhat.com> Make gdkx.h the only installed header from gdk/x11. All structures in gdk/x11 are opaque. * gdk/x11/Makefile.am gdk/x11/gdkx.h gdk/x11/gdkprivate-x11.h: Don't install gdk{drawable,pixmap,window}-x11.h. * gdk/x11/{gdkcolormap-x11.c, gdkfont-x11.c, gdkx.h, gdkvisual-x11.c: Move GdkColormapPrivateX11, GdkFontPrivateX GdkImagePrivateX11, GdkVisualClass into C files. * gdk/gdkpixmap-x11.[ch]: Make gdk_pixmap_impl_get_type() static. * gdk/x11/{gdkcolor-x11.c, gdkcursor-x11.c, gdkdrawable-x11.c, gdkfont-x11.c, gdkgc-x11.c, gdkx.h, gdkimage-x11,gdkvisual-x11.c} Add public functions to replace previously exported direct structure access. gdk_x11_colormap_get_{xdisplay,xcolormap} gdk_x11_cursor_get_{xdisplay,xcursor}, gdk_x11_drawable_get_{xdisplay,xcursor,gdk_x11_visual_get_xvisual, gdk_x11_font_get_{xdisplay,xfont}, gdk_x11_image_get_{xdisplay,ximage}, gdk_x11_gc_get_{xdisplay,ximage} * gdk/gdkprivate.h gdk/gdkinternals.h: Move GdkColorInfo, GdkEventFilter, GdkClientFilter, GdkFontPrivate to gdkinternals. Fix a number of variables and functions that were exported "accidentally" from GDK. * gdk/**.[ch]: gdk => _gdk for gdk_visual_init, gdk_events_init, gdk_input_init, gdk_dnd_init, gdk_image_exit, gdk_input_exit, gdk_windowing_exit, gdk_event_func, gdk_event_data, gdk_event_notify, gdk_queued_events, gdk_queued_tail, gdk_event_new, gdk_events_queue, gdk_events_unqueue, gdk_event_queue_find_first, gdk_event_queue_remove_link, gdk_event_queue_append, gdk_event_button_generate, gdk_debug_flags, gdk_default_filters, gdk_parent_root. * gdk/x11/{gdkevents-x11.c, gdkglobals-x11.c, gdkimage-x11.c, gdkmain-x11.c, gdkprivate-x11.h, gdk/x11/gdkwindow-x11.c}: gdk => _gdk for gdk_event_mask_table, gkd_nevent_masks, gdk_wm_window_protocols, gdk_leader_window, gdk_xgrab_window, gdk_use_xshm, gdk_input_ignore_core. * gdk/x11/xsettings-common.h (xsettings_list_insert): Add #defines to namespace functions into the private _gdk_ namespace. * gdk/gdkwindow.[ch] gdk/x11/gdkx.h: Add gdk_get_default_root_window () to replace gdk_parent_root exported variable. Adjust and deprecate GDK_ROOT_PARENT(). * demos/{testpixbuf-drawable.c,testpixbuf-save.c}: Fix GDK_ROOT_PARENT usage, remove includes of port-specific headers. * gdk/{win32,x11,fb}/gdkinput*.[ch]: s/gdk/_gdk/ for _gdk_input_gxid_host, _gdk_input_gxid_port, _gdk_input_ignore_core, gdk_input_devices, _gdk_input_windows, gdk_init_input_core. * gdk/x11/{gdkevents-x11.,c gdkglobals-x11.c, gdkmain-x11.c} docs/Changes-2.0.txt: Remove gdk_wm_protocols, gdk_wm_delete_window functions, gdk_wm_take_focus, use gdk_atom_intern() instead. * gdk/linux-fb/{gdkselection-fb.c, gdkmain-fb.c, gdkprivatefb.h} gdk/win32/{gdkselection-win32.c, gdkmgdkwin32.h, gdkprivate-win32.h} gdk/x11/{gdkselection-x11.c gdkx.h, gtkprivate-x11.h} gtk/gtkselection.c Unexport gdk_selection_property, just use gdk_atom_intern ("GDK_SELECTION"). * gdk/x11/{gdkprivate-x11.h,gdkdrawable-x11h,gdkgc-x11.c,gdkx.h}: Unexport gdk_drawable_impl_x11_get_type, gdk_gc_x11_get_type, GDK_GC_X11 cast macros, GdkGCX11 structures, GdkCursorPrivate, GdkVisualprivate, gdk_x11_gc_flush. Make a number of public exports of variables into functions to increase encapsulation. * gdk/gdkinternals.h gdk/gdkinput.h gdk/gdkevents.h gdk/linux-fb/gdkmouse-fb.c: gdk_core_pointer => _gdk_core_pointer, move to gdkinternals.h. Add gdk_device_get_core_pointer (). * gdk/gdkprivate.h gdk/gdkpango.c gdk/gdkinternals.h docs/Changes-2.0.txt: Unexport gdk_parent_root, gdk_error_code, gdk_error_warnings. * gdk/x11/{gdkcolormap-x11.c, gdkmain-x11.c, gdkx.h} docs/Changes-2.0.txt: s/gdk_screen/_gdk_screen/, add gdk_x11_get_default_screen() s/gdk_root_window/_gdk_root_window/, add gdk_x11_get_default_root_xwindow() Add gdk_x11_get_default_xdisplay(). * gdk/gdk.h gdk/gdk.c linux-fb/gdkfb.h linux-fb/gdkglobals-fb.c win32/gdkwin32.h x11/gdkglobals-x11.c gdk/x11/gdkmain-x11.c gdk/x11/gdkx.h: gdk/gdk.def: Add gdk_get/set_program_class, Don't export gdk_progclass, move --class command line option and handling to common portion of GDK. Miscellaneous fixes: * gdk/x11/gdkwindow-x11.c (gdk_window_set_icon_list): Fix g_return_val_if_fail that should have been g_return_if_fail. * gdk/gdkinternals.h gdk/gdkprivate.h: Move gdk_synthesize_window_state() to the semi-public gdkprivate.h. * gtk/gtkdnd.c (_gtk_drag_source_handle_event): Remove uneeded X11 dependency. * gdk/linux-fb/gdkmain-fb.c gdk/win32/gdkmain-win32.c gdk/TODO: Remove unused gdk_key_repeat_disable/restore. * linux-fb/gdkglobals-fb.c win32/gdkglobals-win32.c x11/gdkglobals-x11.c x11/gdkprivate-x11.h gdk/gdk.def: Remove unused gdk_null_window_warnings variable. * gdk/Makefile.am (DIST_SUBDIRS) nanox/*: cvs remove nanox; it can be retrieved from the repository; it is too far from functional to be worth having people check out; it would be easier to start from scratch, I suspect. * gdk/x11/gdkpixmap-x11.c: Fix lvalue usage of GDK_PIXMAP_XID(). * gdk/x11/gdkkeys-x11.c gdk/gdkrgb.c gdk/gdkwindow.c gdk/x11/gdkpango-x11.c gdk/x11/gdkselection-x11.c: Fix some accidentally global variables and unused global variables. * gdk/x11/gdkkeys-x11.c gdk/gdkrgb.c gdk/gdkwindow.c gdk/x11/gdkpango-x11.c gdk/x11/gdkselection-x11.c: Fix some accidentally global variables and unused global variables. Add some space for future expansion to multihead. * gdk/gdkdrawable.h: Add four reserved function pointers for future expansion of GdkDrawableClass. * gtk/gtkwindow.h gtk/gtkinvisible.h: Add reserved pointer where we can put a GdkScreen * later.
2001-09-07 21:50:20 +00:00
_gdk_visual_init (void)
{
struct
{
BITMAPINFOHEADER bi;
union
{
RGBQUAD colors[256];
DWORD fields[256];
} u;
} bmi;
HBITMAP hbm;
int rastercaps, numcolors, sizepalette, bitspixel;
system_visual = g_new (GdkVisualPrivate, 1);
bitspixel = GetDeviceCaps (gdk_display_hdc, BITSPIXEL);
rastercaps = GetDeviceCaps (gdk_display_hdc, RASTERCAPS);
system_visual->xvisual = g_new (Visual, 1);
system_visual->xvisual->visualid = 0;
system_visual->xvisual->bitspixel = bitspixel;
if (rastercaps & RC_PALETTE)
{
if (!getenv ("GDK_WIN32_ENABLE_BROKEN_PSEUDOCOLOR_VISUAL"))
g_error ("Palettized display (%d-colour) mode not supported on Windows.",
GetDeviceCaps (gdk_display_hdc, SIZEPALETTE));
system_visual->visual.type = GDK_VISUAL_PSEUDO_COLOR;
numcolors = GetDeviceCaps (gdk_display_hdc, NUMCOLORS);
sizepalette = GetDeviceCaps (gdk_display_hdc, SIZEPALETTE);
system_visual->xvisual->map_entries = sizepalette;
}
else if (bitspixel == 1)
{
system_visual->visual.type = GDK_VISUAL_STATIC_GRAY;
system_visual->xvisual->map_entries = 2;
}
else if (bitspixel == 4)
{
system_visual->visual.type = GDK_VISUAL_STATIC_COLOR;
system_visual->xvisual->map_entries = 16;
}
else if (bitspixel == 8)
{
system_visual->visual.type = GDK_VISUAL_STATIC_COLOR;
system_visual->xvisual->map_entries = 256;
}
else if (bitspixel == 16)
{
system_visual->visual.type = GDK_VISUAL_TRUE_COLOR;
#if 1
/* This code by Mike Enright,
* see http://www.users.cts.com/sd/m/menright/display.html
*/
memset (&bmi, 0, sizeof (bmi));
bmi.bi.biSize = sizeof (bmi.bi);
hbm = CreateCompatibleBitmap (gdk_display_hdc, 1, 1);
GetDIBits (gdk_display_hdc, hbm, 0, 1, NULL,
(BITMAPINFO *) &bmi, DIB_RGB_COLORS);
GetDIBits (gdk_display_hdc, hbm, 0, 1, NULL,
(BITMAPINFO *) &bmi, DIB_RGB_COLORS);
DeleteObject (hbm);
if (bmi.bi.biCompression != BI_BITFIELDS)
{
/* Either BI_RGB or BI_RLE_something
* .... or perhaps (!!) something else.
* Theoretically biCompression might be
* mmioFourCC('c','v','i','d') but I doubt it.
*/
if (bmi.bi.biCompression == BI_RGB)
{
/* It's 555 */
bitspixel = 15;
system_visual->visual.red_mask = 0x00007C00;
system_visual->visual.green_mask = 0x000003E0;
system_visual->visual.blue_mask = 0x0000001F;
}
else
{
g_assert_not_reached ();
}
}
else
{
DWORD allmasks =
bmi.u.fields[0] | bmi.u.fields[1] | bmi.u.fields[2];
int k = 0;
while (allmasks)
{
if (allmasks&1)
k++;
allmasks/=2;
}
bitspixel = k;
system_visual->visual.red_mask = bmi.u.fields[0];
system_visual->visual.green_mask = bmi.u.fields[1];
system_visual->visual.blue_mask = bmi.u.fields[2];
}
#else
/* Old, incorrect (but still working) code. */
#if 0
system_visual->visual.red_mask = 0x0000F800;
system_visual->visual.green_mask = 0x000007E0;
system_visual->visual.blue_mask = 0x0000001F;
#else
system_visual->visual.red_mask = 0x00007C00;
system_visual->visual.green_mask = 0x000003E0;
system_visual->visual.blue_mask = 0x0000001F;
#endif
#endif
}
else if (bitspixel == 24 || bitspixel == 32)
{
bitspixel = 24;
system_visual->visual.type = GDK_VISUAL_TRUE_COLOR;
system_visual->visual.red_mask = 0x00FF0000;
system_visual->visual.green_mask = 0x0000FF00;
system_visual->visual.blue_mask = 0x000000FF;
}
else
Make gdkx.h the only installed header from gdk/x11. All structures in Fri Sep 7 11:51:44 2001 Owen Taylor <otaylor@redhat.com> Make gdkx.h the only installed header from gdk/x11. All structures in gdk/x11 are opaque. * gdk/x11/Makefile.am gdk/x11/gdkx.h gdk/x11/gdkprivate-x11.h: Don't install gdk{drawable,pixmap,window}-x11.h. * gdk/x11/{gdkcolormap-x11.c, gdkfont-x11.c, gdkx.h, gdkvisual-x11.c: Move GdkColormapPrivateX11, GdkFontPrivateX GdkImagePrivateX11, GdkVisualClass into C files. * gdk/gdkpixmap-x11.[ch]: Make gdk_pixmap_impl_get_type() static. * gdk/x11/{gdkcolor-x11.c, gdkcursor-x11.c, gdkdrawable-x11.c, gdkfont-x11.c, gdkgc-x11.c, gdkx.h, gdkimage-x11,gdkvisual-x11.c} Add public functions to replace previously exported direct structure access. gdk_x11_colormap_get_{xdisplay,xcolormap} gdk_x11_cursor_get_{xdisplay,xcursor}, gdk_x11_drawable_get_{xdisplay,xcursor,gdk_x11_visual_get_xvisual, gdk_x11_font_get_{xdisplay,xfont}, gdk_x11_image_get_{xdisplay,ximage}, gdk_x11_gc_get_{xdisplay,ximage} * gdk/gdkprivate.h gdk/gdkinternals.h: Move GdkColorInfo, GdkEventFilter, GdkClientFilter, GdkFontPrivate to gdkinternals. Fix a number of variables and functions that were exported "accidentally" from GDK. * gdk/**.[ch]: gdk => _gdk for gdk_visual_init, gdk_events_init, gdk_input_init, gdk_dnd_init, gdk_image_exit, gdk_input_exit, gdk_windowing_exit, gdk_event_func, gdk_event_data, gdk_event_notify, gdk_queued_events, gdk_queued_tail, gdk_event_new, gdk_events_queue, gdk_events_unqueue, gdk_event_queue_find_first, gdk_event_queue_remove_link, gdk_event_queue_append, gdk_event_button_generate, gdk_debug_flags, gdk_default_filters, gdk_parent_root. * gdk/x11/{gdkevents-x11.c, gdkglobals-x11.c, gdkimage-x11.c, gdkmain-x11.c, gdkprivate-x11.h, gdk/x11/gdkwindow-x11.c}: gdk => _gdk for gdk_event_mask_table, gkd_nevent_masks, gdk_wm_window_protocols, gdk_leader_window, gdk_xgrab_window, gdk_use_xshm, gdk_input_ignore_core. * gdk/x11/xsettings-common.h (xsettings_list_insert): Add #defines to namespace functions into the private _gdk_ namespace. * gdk/gdkwindow.[ch] gdk/x11/gdkx.h: Add gdk_get_default_root_window () to replace gdk_parent_root exported variable. Adjust and deprecate GDK_ROOT_PARENT(). * demos/{testpixbuf-drawable.c,testpixbuf-save.c}: Fix GDK_ROOT_PARENT usage, remove includes of port-specific headers. * gdk/{win32,x11,fb}/gdkinput*.[ch]: s/gdk/_gdk/ for _gdk_input_gxid_host, _gdk_input_gxid_port, _gdk_input_ignore_core, gdk_input_devices, _gdk_input_windows, gdk_init_input_core. * gdk/x11/{gdkevents-x11.,c gdkglobals-x11.c, gdkmain-x11.c} docs/Changes-2.0.txt: Remove gdk_wm_protocols, gdk_wm_delete_window functions, gdk_wm_take_focus, use gdk_atom_intern() instead. * gdk/linux-fb/{gdkselection-fb.c, gdkmain-fb.c, gdkprivatefb.h} gdk/win32/{gdkselection-win32.c, gdkmgdkwin32.h, gdkprivate-win32.h} gdk/x11/{gdkselection-x11.c gdkx.h, gtkprivate-x11.h} gtk/gtkselection.c Unexport gdk_selection_property, just use gdk_atom_intern ("GDK_SELECTION"). * gdk/x11/{gdkprivate-x11.h,gdkdrawable-x11h,gdkgc-x11.c,gdkx.h}: Unexport gdk_drawable_impl_x11_get_type, gdk_gc_x11_get_type, GDK_GC_X11 cast macros, GdkGCX11 structures, GdkCursorPrivate, GdkVisualprivate, gdk_x11_gc_flush. Make a number of public exports of variables into functions to increase encapsulation. * gdk/gdkinternals.h gdk/gdkinput.h gdk/gdkevents.h gdk/linux-fb/gdkmouse-fb.c: gdk_core_pointer => _gdk_core_pointer, move to gdkinternals.h. Add gdk_device_get_core_pointer (). * gdk/gdkprivate.h gdk/gdkpango.c gdk/gdkinternals.h docs/Changes-2.0.txt: Unexport gdk_parent_root, gdk_error_code, gdk_error_warnings. * gdk/x11/{gdkcolormap-x11.c, gdkmain-x11.c, gdkx.h} docs/Changes-2.0.txt: s/gdk_screen/_gdk_screen/, add gdk_x11_get_default_screen() s/gdk_root_window/_gdk_root_window/, add gdk_x11_get_default_root_xwindow() Add gdk_x11_get_default_xdisplay(). * gdk/gdk.h gdk/gdk.c linux-fb/gdkfb.h linux-fb/gdkglobals-fb.c win32/gdkwin32.h x11/gdkglobals-x11.c gdk/x11/gdkmain-x11.c gdk/x11/gdkx.h: gdk/gdk.def: Add gdk_get/set_program_class, Don't export gdk_progclass, move --class command line option and handling to common portion of GDK. Miscellaneous fixes: * gdk/x11/gdkwindow-x11.c (gdk_window_set_icon_list): Fix g_return_val_if_fail that should have been g_return_if_fail. * gdk/gdkinternals.h gdk/gdkprivate.h: Move gdk_synthesize_window_state() to the semi-public gdkprivate.h. * gtk/gtkdnd.c (_gtk_drag_source_handle_event): Remove uneeded X11 dependency. * gdk/linux-fb/gdkmain-fb.c gdk/win32/gdkmain-win32.c gdk/TODO: Remove unused gdk_key_repeat_disable/restore. * linux-fb/gdkglobals-fb.c win32/gdkglobals-win32.c x11/gdkglobals-x11.c x11/gdkprivate-x11.h gdk/gdk.def: Remove unused gdk_null_window_warnings variable. * gdk/Makefile.am (DIST_SUBDIRS) nanox/*: cvs remove nanox; it can be retrieved from the repository; it is too far from functional to be worth having people check out; it would be easier to start from scratch, I suspect. * gdk/x11/gdkpixmap-x11.c: Fix lvalue usage of GDK_PIXMAP_XID(). * gdk/x11/gdkkeys-x11.c gdk/gdkrgb.c gdk/gdkwindow.c gdk/x11/gdkpango-x11.c gdk/x11/gdkselection-x11.c: Fix some accidentally global variables and unused global variables. * gdk/x11/gdkkeys-x11.c gdk/gdkrgb.c gdk/gdkwindow.c gdk/x11/gdkpango-x11.c gdk/x11/gdkselection-x11.c: Fix some accidentally global variables and unused global variables. Add some space for future expansion to multihead. * gdk/gdkdrawable.h: Add four reserved function pointers for future expansion of GdkDrawableClass. * gtk/gtkwindow.h gtk/gtkinvisible.h: Add reserved pointer where we can put a GdkScreen * later.
2001-09-07 21:50:20 +00:00
g_error ("_gdk_visual_init: unsupported BITSPIXEL: %d\n", bitspixel);
system_visual->visual.depth = bitspixel;
system_visual->visual.byte_order = GDK_LSB_FIRST;
system_visual->visual.bits_per_rgb = 42; /* Not used? */
if ((system_visual->visual.type == GDK_VISUAL_TRUE_COLOR) ||
(system_visual->visual.type == GDK_VISUAL_DIRECT_COLOR))
{
gdk_visual_decompose_mask (system_visual->visual.red_mask,
&system_visual->visual.red_shift,
&system_visual->visual.red_prec);
gdk_visual_decompose_mask (system_visual->visual.green_mask,
&system_visual->visual.green_shift,
&system_visual->visual.green_prec);
gdk_visual_decompose_mask (system_visual->visual.blue_mask,
&system_visual->visual.blue_shift,
&system_visual->visual.blue_prec);
system_visual->xvisual->map_entries =
1 << (MAX (system_visual->visual.red_prec,
MAX (system_visual->visual.green_prec,
system_visual->visual.blue_prec)));
}
else
{
system_visual->visual.red_mask = 0;
system_visual->visual.red_shift = 0;
system_visual->visual.red_prec = 0;
system_visual->visual.green_mask = 0;
system_visual->visual.green_shift = 0;
system_visual->visual.green_prec = 0;
system_visual->visual.blue_mask = 0;
system_visual->visual.blue_shift = 0;
system_visual->visual.blue_prec = 0;
}
system_visual->visual.colormap_size = system_visual->xvisual->map_entries;
available_depths[0] = system_visual->visual.depth;
available_types[0] = system_visual->visual.type;
}
gint
gdk_visual_get_best_depth (void)
{
return available_depths[0];
}
GdkVisualType
gdk_visual_get_best_type (void)
{
return available_types[0];
}
GdkVisual*
gdk_visual_get_system (void)
{
return ((GdkVisual*) system_visual);
}
GdkVisual*
gdk_visual_get_best (void)
{
return ((GdkVisual*) system_visual);
}
GdkVisual*
gdk_visual_get_best_with_depth (gint depth)
{
if (depth == system_visual->visual.depth)
return (GdkVisual*) system_visual;
else
return NULL;
}
GdkVisual*
gdk_visual_get_best_with_type (GdkVisualType visual_type)
{
if (visual_type == system_visual->visual.type)
return (GdkVisual*) system_visual;
else
return NULL;
}
GdkVisual*
gdk_visual_get_best_with_both (gint depth,
GdkVisualType visual_type)
{
if ((depth == system_visual->visual.depth) &&
(visual_type == system_visual->visual.type))
return (GdkVisual*) system_visual;
else
return NULL;
}
void
gdk_query_depths (gint **depths,
gint *count)
{
*count = 1;
*depths = available_depths;
}
void
gdk_query_visual_types (GdkVisualType **visual_types,
gint *count)
{
*count = 1;
*visual_types = available_types;
}
GList*
gdk_list_visuals (void)
{
return g_list_append (NULL, (gpointer) system_visual);
}
GdkVisual*
gdk_visual_lookup (Visual *xvisual)
{
if (system_visual->xvisual == xvisual)
return (GdkVisual *) system_visual;
else
return NULL;
}
static void
gdk_visual_decompose_mask (gulong mask,
gint *shift,
gint *prec)
{
*shift = 0;
*prec = 0;
while (!(mask & 0x1))
{
(*shift)++;
mask >>= 1;
}
while (mask & 0x1)
{
(*prec)++;
mask >>= 1;
}
}