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Cache the Motif drag window to avoid fetching it every time

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* src/xterm.c (xm_get_drag_window_1): New function.
(xm_get_drag_window): Cache the window.  If it already exists,
just return it.
(xm_setup_dnd_targets): If a BadWindow error occurs, re-create
the Motif drag window.

* src/xterm.h (struct x_display_info): New field
`motif_drag_window'.
This commit is contained in:
Po Lu 2022-06-19 11:35:12 +08:00
parent 3285901e9a
commit fd853c71a9
2 changed files with 31 additions and 1 deletions
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29
src/xterm.c
View file

@ -1805,7 +1805,7 @@ xm_drag_window_io_error_handler (Display *dpy)
}
static Window
xm_get_drag_window (struct x_display_info *dpyinfo)
xm_get_drag_window_1 (struct x_display_info *dpyinfo)
{
Atom actual_type, _MOTIF_DRAG_WINDOW;
int rc, actual_format;
@ -1975,6 +1975,16 @@ xm_get_drag_window (struct x_display_info *dpyinfo)
return drag_window;
}
static Window
xm_get_drag_window (struct x_display_info *dpyinfo)
{
if (dpyinfo->motif_drag_window != None)
return dpyinfo->motif_drag_window;
dpyinfo->motif_drag_window = xm_get_drag_window_1 (dpyinfo);
return dpyinfo->motif_drag_window;
}
static int
xm_setup_dnd_targets (struct x_display_info *dpyinfo,
Atom *targets, int ntargets)
@ -1984,6 +1994,7 @@ xm_setup_dnd_targets (struct x_display_info *dpyinfo,
unsigned char *tmp_data = NULL;
unsigned long nitems, bytes_remaining;
int rc, actual_format, idx;
bool had_errors;
xm_targets_table_header header;
xm_targets_table_rec **recs;
xm_byte_order byteorder;
@ -1991,6 +2002,8 @@ xm_setup_dnd_targets (struct x_display_info *dpyinfo,
ptrdiff_t total_bytes, total_items, i;
uint32_t size, target_count;
retry_drag_window:
drag_window = xm_get_drag_window (dpyinfo);
if (drag_window == None || ntargets > 64)
@ -2003,12 +2016,26 @@ xm_setup_dnd_targets (struct x_display_info *dpyinfo,
sizeof (Atom), x_atoms_compare);
XGrabServer (dpyinfo->display);
x_catch_errors (dpyinfo->display);
rc = XGetWindowProperty (dpyinfo->display, drag_window,
dpyinfo->Xatom_MOTIF_DRAG_TARGETS,
0L, LONG_MAX, False,
dpyinfo->Xatom_MOTIF_DRAG_TARGETS,
&actual_type, &actual_format, &nitems,
&bytes_remaining, &tmp_data) == Success;
had_errors = x_had_errors_p (dpyinfo->display);
x_uncatch_errors ();
/* The drag window is probably invalid, so remove our record of
it. */
if (had_errors)
{
dpyinfo->motif_drag_window = None;
XUngrabServer (dpyinfo->display);
goto retry_drag_window;
}
if (rc && tmp_data && !bytes_remaining
&& actual_type == dpyinfo->Xatom_MOTIF_DRAG_TARGETS

3
src/xterm.h
View file

@ -578,6 +578,9 @@ struct x_display_info
/* The frame that currently owns `motif_drag_atom'. */
struct frame *motif_drag_atom_owner;
/* The drag window for this display. */
Window motif_drag_window;
/* Extended window manager hints, Atoms supported by the window manager and
atoms for setting the window type. */
Atom Xatom_net_supported, Xatom_net_supporting_wm_check;