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x11: Avoid memory waste and work when creating selection input stream

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Since every input stream now uses its own window, the X property used to
transfer the data no longer has to be unique, so we can stop generating
those unique names. This avoids creating a new atom for every transfer
since those are never freed, neither on the shell nor on the server
side. Also don't unnecessarily duplicate other strings that are
(almost) never used and get them from the atom in the rare case when
they are needed.

Fixes https://gitlab.gnome.org/GNOME/mutter/-/issues/1328

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1812>
This commit is contained in:
Sebastian Keller 2021-04-05 13:04:46 +02:00
parent dbd6e74d3c
commit 986d3043ab
1 changed files with 7 additions and 14 deletions
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21
src/x11/meta-x11-selection-input-stream.c
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@ -40,11 +40,8 @@ struct MetaX11SelectionInputStreamPrivate
MetaX11Display *x11_display;
Window window;
GAsyncQueue *chunks;
char *selection;
Atom xselection;
char *target;
Atom xtarget;
char *property;
Atom xproperty;
const char *type;
Atom xtype;
@ -291,10 +288,6 @@ meta_x11_selection_input_stream_finalize (GObject *object)
g_async_queue_unref (priv->chunks);
g_free (priv->selection);
g_free (priv->target);
g_free (priv->property);
XDestroyWindow (xdisplay, priv->window);
G_OBJECT_CLASS (meta_x11_selection_input_stream_parent_class)->finalize (object);
@ -402,6 +395,7 @@ meta_x11_selection_input_stream_xevent (MetaX11SelectionInputStream *stream,
GBytes *bytes;
Atom type;
gint format;
char *target;
xdisplay = priv->x11_display->xdisplay;
xwindow = priv->window;
@ -459,11 +453,13 @@ meta_x11_selection_input_stream_xevent (MetaX11SelectionInputStream *stream,
if (xevent->xselection.property == None)
{
target = XGetAtomName (xdisplay, priv->xtarget);
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_NOT_FOUND,
_("Format %s not supported"), priv->target);
_("Format %s not supported"), target);
meta_x11_selection_input_stream_complete (stream);
XFree (target);
}
else
{
@ -528,12 +524,9 @@ meta_x11_selection_input_stream_new_async (MetaX11Display *x11_display,
priv->x11_display = x11_display;
x11_display->selection.input_streams =
g_list_prepend (x11_display->selection.input_streams, stream);
priv->selection = g_strdup (selection);
priv->xselection = XInternAtom (x11_display->xdisplay, priv->selection, False);
priv->target = g_strdup (target);
priv->xtarget = XInternAtom (x11_display->xdisplay, priv->target, False);
priv->property = g_strdup_printf ("META_SELECTION_%p", stream);
priv->xproperty = XInternAtom (x11_display->xdisplay, priv->property, False);
priv->xselection = XInternAtom (x11_display->xdisplay, selection, False);
priv->xtarget = XInternAtom (x11_display->xdisplay, target, False);
priv->xproperty = XInternAtom (x11_display->xdisplay, "META_SELECTION", False);
priv->window = XCreateWindow (x11_display->xdisplay,
x11_display->xroot,
-1, -1, 1, 1,