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gtk2/gdk/x11/gdkcursor-x11.c
Benjamin Otte 4db086da4b x11: Rename GdkDisplayX11 to GdkX11Display 
Also rename all the macros etc.
2010-12-21 12:07:07 -05:00

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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 "config.h"
/* needs to be first because any header might include gdk-pixbuf.h otherwise */
#define GDK_PIXBUF_ENABLE_BACKEND
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "gdkcursor.h"
#include "gdkcursorprivate.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
#include <X11/Xlib.h>
#include <X11/cursorfont.h>
#ifdef HAVE_XCURSOR
#include <X11/Xcursor/Xcursor.h>
#endif
#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif
#include <string.h>
#include <errno.h>
#define GDK_TYPE_X11_CURSOR (gdk_x11_cursor_get_type ())
#define GDK_X11_CURSOR(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_X11_CURSOR, GdkX11Cursor))
#define GDK_X11_CURSOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_X11_CURSOR, GdkX11CursorClass))
#define GDK_IS_X11_CURSOR(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_X11_CURSOR))
#define GDK_IS_X11_CURSOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_X11_CURSOR))
#define GDK_X11_CURSOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_X11_CURSOR, GdkX11CursorClass))
typedef struct _GdkX11Cursor GdkX11Cursor;
typedef struct _GdkX11CursorClass GdkX11CursorClass;
struct _GdkX11Cursor
{
GdkCursor cursor;
Cursor xcursor;
gchar *name;
guint serial;
};
struct _GdkX11CursorClass
{
GdkCursorClass cursor_class;
};
static guint theme_serial = 0;
/* cursor_cache holds a cache of non-pixmap cursors to avoid expensive
* libXcursor searches, cursors are added to it but only removed when
* their display is closed. We make the assumption that since there are
* a small number of display's and a small number of cursor's that this
* list will stay small enough not to be a problem.
*/
static GSList* cursor_cache = NULL;
struct cursor_cache_key
{
GdkDisplay* display;
GdkCursorType type;
const char* name;
};
/* Caller should check if there is already a match first.
* Cursor MUST be either a typed cursor or a pixmap with
* a non-NULL name.
*/
static void
add_to_cache (GdkX11Cursor* cursor)
{
cursor_cache = g_slist_prepend (cursor_cache, cursor);
/* Take a ref so that if the caller frees it we still have it */
g_object_ref (cursor);
}
/* Returns 0 on a match
*/
static gint
cache_compare_func (gconstpointer listelem,
gconstpointer target)
{
GdkX11Cursor* cursor = (GdkX11Cursor*)listelem;
struct cursor_cache_key* key = (struct cursor_cache_key*)target;
if ((cursor->cursor.type != key->type) ||
(gdk_cursor_get_display (GDK_CURSOR (cursor)) != key->display))
return 1; /* No match */
/* Elements marked as pixmap must be named cursors
* (since we don't store normal pixmap cursors
*/
if (key->type == GDK_CURSOR_IS_PIXMAP)
return strcmp (key->name, cursor->name);
return 0; /* Match */
}
/* Returns the cursor if there is a match, NULL if not
* For named cursors type shall be GDK_CURSOR_IS_PIXMAP
* For unnamed, typed cursors, name shall be NULL
*/
static GdkX11Cursor*
find_in_cache (GdkDisplay *display,
GdkCursorType type,
const char *name)
{
GSList* res;
struct cursor_cache_key key;
key.display = display;
key.type = type;
key.name = name;
res = g_slist_find_custom (cursor_cache, &key, cache_compare_func);
if (res)
return (GdkX11Cursor *) res->data;
return NULL;
}
/* Called by gdk_x11_display_finalize to flush any cached cursors
* for a dead display.
*/
void
_gdk_x11_cursor_display_finalize (GdkDisplay *display)
{
GSList* item;
GSList** itemp; /* Pointer to the thing to fix when we delete an item */
item = cursor_cache;
itemp = &cursor_cache;
while (item)
{
GdkX11Cursor* cursor = (GdkX11Cursor*)(item->data);
if (gdk_cursor_get_display (GDK_CURSOR (cursor)) == display)
{
GSList* olditem;
gdk_cursor_unref ((GdkCursor*) cursor);
/* Remove this item from the list */
*(itemp) = item->next;
olditem = item;
item = g_slist_next (item);
g_slist_free_1 (olditem);
}
else
{
itemp = &(item->next);
item = g_slist_next (item);
}
}
}
/*** GdkX11Cursor ***/
G_DEFINE_TYPE (GdkX11Cursor, gdk_x11_cursor, GDK_TYPE_CURSOR)
static GdkPixbuf* gdk_x11_cursor_get_image (GdkCursor *cursor);
void
gdk_x11_cursor_finalize (GObject *object)
{
GdkX11Cursor *private = GDK_X11_CURSOR (object);
GdkDisplay *display;
display = gdk_cursor_get_display (GDK_CURSOR (object));
if (private->xcursor && !gdk_display_is_closed (display))
XFreeCursor (GDK_DISPLAY_XDISPLAY (display), private->xcursor);
g_free (private->name);
G_OBJECT_CLASS (gdk_x11_cursor_parent_class)->finalize (object);
}
static void
gdk_x11_cursor_class_init (GdkX11CursorClass *xcursor_class)
{
GdkCursorClass *cursor_class = GDK_CURSOR_CLASS (xcursor_class);
GObjectClass *object_class = G_OBJECT_CLASS (xcursor_class);
object_class->finalize = gdk_x11_cursor_finalize;
cursor_class->get_image = gdk_x11_cursor_get_image;
}
static void
gdk_x11_cursor_init (GdkX11Cursor *cursor)
{
}
static Cursor
get_blank_cursor (GdkDisplay *display)
{
GdkScreen *screen;
Pixmap pixmap;
XColor color;
Cursor cursor;
cairo_surface_t *surface;
cairo_t *cr;
screen = gdk_display_get_default_screen (display);
surface = _gdk_x11_window_create_bitmap_surface (gdk_screen_get_root_window (screen), 1, 1);
/* Clear surface */
cr = cairo_create (surface);
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_destroy (cr);
pixmap = cairo_xlib_surface_get_drawable (surface);
color.pixel = 0;
color.red = color.blue = color.green = 0;
if (gdk_display_is_closed (display))
cursor = None;
else
cursor = XCreatePixmapCursor (GDK_DISPLAY_XDISPLAY (display),
pixmap, pixmap,
&color, &color, 1, 1);
cairo_surface_destroy (surface);
return cursor;
}
GdkCursor*
_gdk_x11_display_get_cursor_for_type (GdkDisplay *display,
GdkCursorType cursor_type)
{
GdkX11Cursor *private;
Cursor xcursor;
if (gdk_display_is_closed (display))
{
xcursor = None;
}
else
{
private = find_in_cache (display, cursor_type, NULL);
if (private)
{
/* Cache had it, add a ref for this user */
g_object_ref (private);
return (GdkCursor*) private;
}
else
{
if (cursor_type != GDK_BLANK_CURSOR)
xcursor = XCreateFontCursor (GDK_DISPLAY_XDISPLAY (display),
cursor_type);
else
xcursor = get_blank_cursor (display);
}
}
private = g_object_new (GDK_TYPE_X11_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->xcursor = xcursor;
private->name = NULL;
private->serial = theme_serial;
if (xcursor != None)
add_to_cache (private);
return GDK_CURSOR (private);
}
/**
* gdk_x11_cursor_get_xdisplay:
* @cursor: a #GdkCursor.
*
* Returns the display of a #GdkCursor.
*
* Return value: an Xlib <type>Display*</type>.
**/
Display *
gdk_x11_cursor_get_xdisplay (GdkCursor *cursor)
{
g_return_val_if_fail (cursor != NULL, NULL);
return GDK_DISPLAY_XDISPLAY (gdk_cursor_get_display (cursor));
}
/**
* gdk_x11_cursor_get_xcursor:
* @cursor: a #GdkCursor.
*
* Returns the X cursor belonging to a #GdkCursor.
*
* Return value: an Xlib <type>Cursor</type>.
**/
Cursor
gdk_x11_cursor_get_xcursor (GdkCursor *cursor)
{
g_return_val_if_fail (cursor != NULL, None);
return ((GdkX11Cursor *)cursor)->xcursor;
}
#if defined(HAVE_XCURSOR) && defined(HAVE_XFIXES) && XFIXES_MAJOR >= 2
static GdkPixbuf*
gdk_x11_cursor_get_image (GdkCursor *cursor)
{
Display *xdisplay;
GdkX11Cursor *private;
XcursorImages *images = NULL;
XcursorImage *image;
gint size;
gchar buf[32];
guchar *data, *p, tmp;
GdkPixbuf *pixbuf;
gchar *theme;
private = GDK_X11_CURSOR (cursor);
xdisplay = GDK_DISPLAY_XDISPLAY (gdk_cursor_get_display (cursor));
size = XcursorGetDefaultSize (xdisplay);
theme = XcursorGetTheme (xdisplay);
if (cursor->type == GDK_CURSOR_IS_PIXMAP)
{
if (private->name)
images = XcursorLibraryLoadImages (private->name, theme, size);
}
else
images = XcursorShapeLoadImages (cursor->type, theme, size);
if (!images)
return NULL;
image = images->images[0];
data = g_malloc (4 * image->width * image->height);
memcpy (data, image->pixels, 4 * image->width * image->height);
for (p = data; p < data + (4 * image->width * image->height); p += 4)
{
tmp = p[0];
p[0] = p[2];
p[2] = tmp;
}
pixbuf = gdk_pixbuf_new_from_data (data, GDK_COLORSPACE_RGB, TRUE,
8, image->width, image->height,
4 * image->width,
(GdkPixbufDestroyNotify)g_free, NULL);
if (private->name)
gdk_pixbuf_set_option (pixbuf, "name", private->name);
g_snprintf (buf, 32, "%d", image->xhot);
gdk_pixbuf_set_option (pixbuf, "x_hot", buf);
g_snprintf (buf, 32, "%d", image->yhot);
gdk_pixbuf_set_option (pixbuf, "y_hot", buf);
XcursorImagesDestroy (images);
return pixbuf;
}
void
_gdk_x11_cursor_update_theme (GdkCursor *cursor)
{
Display *xdisplay;
GdkX11Cursor *private;
Cursor new_cursor = None;
GdkX11Display *display_x11;
private = (GdkX11Cursor *) cursor;
display_x11 = GDK_X11_DISPLAY (gdk_cursor_get_display (cursor));
xdisplay = GDK_DISPLAY_XDISPLAY (display_x11);
if (!display_x11->have_xfixes)
return;
if (private->serial == theme_serial)
return;
private->serial = theme_serial;
if (private->xcursor != None)
{
if (cursor->type == GDK_BLANK_CURSOR)
return;
if (cursor->type == GDK_CURSOR_IS_PIXMAP)
{
if (private->name)
new_cursor = XcursorLibraryLoadCursor (xdisplay, private->name);
}
else
new_cursor = XcursorShapeLoadCursor (xdisplay, cursor->type);
if (new_cursor != None)
{
XFixesChangeCursor (xdisplay, new_cursor, private->xcursor);
private->xcursor = new_cursor;
}
}
}
static void
update_cursor (gpointer data,
gpointer user_data)
{
GdkCursor *cursor;
cursor = (GdkCursor*)(data);
if (!cursor)
return;
_gdk_x11_cursor_update_theme (cursor);
}
/**
* gdk_x11_display_set_cursor_theme:
* @display: a #GdkDisplay
* @theme: the name of the cursor theme to use, or %NULL to unset
* a previously set value
* @size: the cursor size to use, or 0 to keep the previous size
*
* Sets the cursor theme from which the images for cursor
* should be taken.
*
* If the windowing system supports it, existing cursors created
* with gdk_cursor_new(), gdk_cursor_new_for_display() and
* gdk_cursor_new_for_name() are updated to reflect the theme
* change. Custom cursors constructed with
* gdk_cursor_new_from_pixbuf() will have to be handled
* by the application (GTK+ applications can learn about
* cursor theme changes by listening for change notification
* for the corresponding #GtkSetting).
*
* Since: 2.8
*/
void
gdk_x11_display_set_cursor_theme (GdkDisplay *display,
const gchar *theme,
const gint size)
{
GdkX11Display *display_x11;
Display *xdisplay;
gchar *old_theme;
gint old_size;
g_return_if_fail (GDK_IS_DISPLAY (display));
display_x11 = GDK_X11_DISPLAY (display);
xdisplay = GDK_DISPLAY_XDISPLAY (display);
old_theme = XcursorGetTheme (xdisplay);
old_size = XcursorGetDefaultSize (xdisplay);
if (old_size == size &&
(old_theme == theme ||
(old_theme && theme && strcmp (old_theme, theme) == 0)))
return;
theme_serial++;
XcursorSetTheme (xdisplay, theme);
if (size > 0)
XcursorSetDefaultSize (xdisplay, size);
g_slist_foreach (cursor_cache, update_cursor, NULL);
}
#else
static GdkPixbuf*
gdk_x11_cursor_get_image (GdkCursor *cursor)
{
return NULL;
}
void
gdk_x11_display_set_cursor_theme (GdkDisplay *display,
const gchar *theme,
const gint size)
{
g_return_if_fail (GDK_IS_DISPLAY (display));
}
void
_gdk_x11_cursor_update_theme (GdkCursor *cursor)
{
g_return_if_fail (cursor != NULL);
}
#endif
#ifdef HAVE_XCURSOR
static XcursorImage*
create_cursor_image (GdkPixbuf *pixbuf,
gint x,
gint y)
{
guint width, height;
XcursorImage *xcimage;
cairo_surface_t *surface;
cairo_t *cr;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
xcimage = XcursorImageCreate (width, height);
xcimage->xhot = x;
xcimage->yhot = y;
surface = cairo_image_surface_create_for_data ((guchar *) xcimage->pixels,
CAIRO_FORMAT_ARGB32,
width,
height,
width * 4);
cr = cairo_create (surface);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return xcimage;
}
GdkCursor *
_gdk_x11_display_get_cursor_for_pixbuf (GdkDisplay *display,
GdkPixbuf *pixbuf,
gint x,
gint y)
{
XcursorImage *xcimage;
Cursor xcursor;
GdkX11Cursor *private;
const char *option;
char *end;
gint64 value;
if (x == -1 && (option = gdk_pixbuf_get_option (pixbuf, "x_hot")))
{
errno = 0;
end = NULL;
value = g_ascii_strtoll (option, &end, 10);
if (errno == 0 &&
end != option &&
value >= 0 && value < G_MAXINT)
x = (gint) value;
}
if (y == -1 && (option = gdk_pixbuf_get_option (pixbuf, "y_hot")))
{
errno = 0;
end = NULL;
value = g_ascii_strtoll (option, &end, 10);
if (errno == 0 &&
end != option &&
value >= 0 && value < G_MAXINT)
y = (gint) value;
}
g_return_val_if_fail (0 <= x && x < gdk_pixbuf_get_width (pixbuf), NULL);
g_return_val_if_fail (0 <= y && y < gdk_pixbuf_get_height (pixbuf), NULL);
if (gdk_display_is_closed (display))
{
xcursor = None;
}
else
{
xcimage = create_cursor_image (pixbuf, x, y);
xcursor = XcursorImageLoadCursor (GDK_DISPLAY_XDISPLAY (display), xcimage);
XcursorImageDestroy (xcimage);
}
private = g_object_new (GDK_TYPE_X11_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->xcursor = xcursor;
private->name = NULL;
private->serial = theme_serial;
return GDK_CURSOR (private);
}
GdkCursor*
_gdk_x11_display_get_cursor_for_name (GdkDisplay *display,
const gchar *name)
{
Cursor xcursor;
Display *xdisplay;
GdkX11Cursor *private;
if (gdk_display_is_closed (display))
{
xcursor = None;
}
else
{
private = find_in_cache (display, GDK_CURSOR_IS_PIXMAP, name);
if (private)
{
/* Cache had it, add a ref for this user */
g_object_ref (private);
return (GdkCursor*) private;
}
xdisplay = GDK_DISPLAY_XDISPLAY (display);
xcursor = XcursorLibraryLoadCursor (xdisplay, name);
if (xcursor == None)
return NULL;
}
private = g_object_new (GDK_TYPE_X11_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->xcursor = xcursor;
private->name = g_strdup (name);
private->serial = theme_serial;
add_to_cache (private);
return GDK_CURSOR (private);
}
gboolean
_gdk_x11_display_supports_cursor_alpha (GdkDisplay *display)
{
return XcursorSupportsARGB (GDK_DISPLAY_XDISPLAY (display));
}
gboolean
_gdk_x11_display_supports_cursor_color (GdkDisplay *display)
{
return XcursorSupportsARGB (GDK_DISPLAY_XDISPLAY (display));
}
void
_gdk_x11_display_get_default_cursor_size (GdkDisplay *display,
guint *width,
guint *height)
{
*width = *height = XcursorGetDefaultSize (GDK_DISPLAY_XDISPLAY (display));
}
#else
static GdkCursor*
gdk_cursor_new_from_pixmap (GdkDisplay *display,
Pixmap source_pixmap,
Pixmap mask_pixmap,
const GdkColor *fg,
const GdkColor *bg,
gint x,
gint y)
{
GdkX11Cursor *private;
Cursor xcursor;
XColor xfg, xbg;
g_return_val_if_fail (fg != NULL, NULL);
g_return_val_if_fail (bg != NULL, NULL);
xfg.pixel = fg->pixel;
xfg.red = fg->red;
xfg.blue = fg->blue;
xfg.green = fg->green;
xbg.pixel = bg->pixel;
xbg.red = bg->red;
xbg.blue = bg->blue;
xbg.green = bg->green;
if (gdk_display_is_closed (display->closed))
xcursor = None;
else
xcursor = XCreatePixmapCursor (GDK_DISPLAY_XDISPLAY (display),
source_pixmap, mask_pixmap, &xfg, &xbg, x, y);
private = g_object_new (GDK_TYPE_X11_CURSOR,
"cursor-type", GDK_CURSOR_IS_PIXMAP,
"display", display,
NULL);
private->xcursor = xcursor;
private->name = NULL;
private->serial = theme_serial;
return GDK_CURSOR (private);
}
GdkCursor *
_gdk_x11_display_get_cursor_for_pixbuf (GdkDisplay *display,
GdkPixbuf *pixbuf,
gint x,
gint y)
{
GdkCursor *cursor;
cairo_surface_t *pixmap, *mask;
guint width, height, n_channels, rowstride, data_stride, i, j;
guint8 *data, *mask_data, *pixels;
GdkColor fg = { 0, 0, 0, 0 };
GdkColor bg = { 0, 0xffff, 0xffff, 0xffff };
GdkScreen *screen;
cairo_surface_t *image;
cairo_t *cr;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
g_return_val_if_fail (0 <= x && x < width, NULL);
g_return_val_if_fail (0 <= y && y < height, NULL);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
data_stride = 4 * ((width + 31) / 32);
data = g_new0 (guint8, data_stride * height);
mask_data = g_new0 (guint8, data_stride * height);
for (j = 0; j < height; j++)
{
guint8 *src = pixels + j * rowstride;
guint8 *d = data + data_stride * j;
guint8 *md = mask_data + data_stride * j;
for (i = 0; i < width; i++)
{
if (src[1] < 0x80)
*d |= 1 << (i % 8);
if (n_channels == 3 || src[3] >= 0x80)
*md |= 1 << (i % 8);
src += n_channels;
if (i % 8 == 7)
{
d++;
md++;
}
}
}
screen = gdk_display_get_default_screen (display);
pixmap = _gdk_x11_window_create_bitmap_surface (gdk_screen_get_root_window (screen),
width, height);
cr = cairo_create (pixmap);
image = cairo_image_surface_create_for_data (data, CAIRO_FORMAT_A1,
width, height, data_stride);
cairo_set_source_surface (cr, image, 0, 0);
cairo_surface_destroy (image);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
cairo_destroy (cr);
mask = _gdk_x11_window_create_bitmap_surface (gdk_screen_get_root_window (screen),
width, height);
cr = cairo_create (mask);
image = cairo_image_surface_create_for_data (mask_data, CAIRO_FORMAT_A1,
width, height, data_stride);
cairo_set_source_surface (cr, image, 0, 0);
cairo_surface_destroy (image);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
cairo_destroy (cr);
cursor = gdk_cursor_new_from_pixmap (display,
cairo_xlib_surface_get_drawable (pixmap),
cairo_xlib_surface_get_drawable (mask),
&fg, &bg,
x, y);
cairo_surface_destroy (pixmap);
cairo_surface_destroy (mask);
g_free (data);
g_free (mask_data);
return cursor;
}
GdkCursor*
_gdk_x11_display_get_cursor_for_name (GdkDisplay *display,
const gchar *name)
{
return NULL;
}
gboolean
_gdk_x11_display_supports_cursor_alpha (GdkDisplay *display)
{
return FALSE;
}
gboolean
_gdk_x11_display_supports_cursor_color (GdkDisplay *display)
{
return FALSE;
}
void
_gdk_x11_display_get_default_cursor_size (GdkDisplay *display)
{
/* no idea, really */
return 20;
}
#endif
void
_gdk_x11_display_get_maximal_cursor_size (GdkDisplay *display,
guint *width,
guint *height)
{
GdkScreen *screen;
GdkWindow *window;
g_return_if_fail (GDK_IS_DISPLAY (display));
screen = gdk_display_get_default_screen (display);
window = gdk_screen_get_root_window (screen);
XQueryBestCursor (GDK_DISPLAY_XDISPLAY (display),
GDK_WINDOW_XID (window),
128, 128, width, height);
}
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