master a4a44d7ee1: Avoid excessive synchronization when handling ShapeNotify events

[Po Lu]

branch: master
commit a4a44d7ee1f63736c2a180317336b7ed13d9c34b
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Avoid excessive synchronization when handling ShapeNotify events
    
    * src/xterm.c (handle_one_xevent): Use XCB to handle ShapeNotify
    events when we want both the bounding and input rects.
---
 src/xterm.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/src/xterm.c b/src/xterm.c
index fb201f8506..3be5733215 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -15699,8 +15699,20 @@ handle_one_xevent (struct x_display_info *dpyinfo,
        {
          XEvent xevent;
          XShapeEvent *xse = (XShapeEvent *) event;
+#if defined HAVE_XCB_SHAPE && defined HAVE_XCB_SHAPE_INPUT_RECTS
+         xcb_shape_get_rectangles_cookie_t bounding_rect_cookie;
+         xcb_shape_get_rectangles_reply_t *bounding_rect_reply;
+         xcb_rectangle_iterator_t bounding_rect_iterator;
+
+         xcb_shape_get_rectangles_cookie_t input_rect_cookie;
+         xcb_shape_get_rectangles_reply_t *input_rect_reply;
+         xcb_rectangle_iterator_t input_rect_iterator;
+
+         xcb_generic_error_t *error;
+#else
          XRectangle *rects;
          int rc, ordering;
+#endif
 
          while (XPending (dpyinfo->display))
            {
@@ -15729,6 +15741,86 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                  tem->n_input_rects = -1;
                  tem->n_bounding_rects = -1;
 
+#if defined HAVE_XCB_SHAPE && defined HAVE_XCB_SHAPE_INPUT_RECTS
+                 bounding_rect_cookie = xcb_shape_get_rectangles 
(dpyinfo->xcb_connection,
+                                                                  
(xcb_window_t) xse->window,
+                                                                  
XCB_SHAPE_SK_BOUNDING);
+                 if (dpyinfo->xshape_major > 1
+                     || (dpyinfo->xshape_major == 1
+                         && dpyinfo->xshape_minor >= 1))
+                   input_rect_cookie
+                     = xcb_shape_get_rectangles (dpyinfo->xcb_connection,
+                                                 (xcb_window_t) xse->window,
+                                                 XCB_SHAPE_SK_INPUT);
+
+                 bounding_rect_reply = xcb_shape_get_rectangles_reply 
(dpyinfo->xcb_connection,
+                                                                       
bounding_rect_cookie,
+                                                                       &error);
+
+                 if (bounding_rect_reply)
+                   {
+                     bounding_rect_iterator
+                       = xcb_shape_get_rectangles_rectangles_iterator 
(bounding_rect_reply);
+                     tem->n_bounding_rects = bounding_rect_iterator.rem + 1;
+                     tem->bounding_rects = xmalloc (tem->n_bounding_rects
+                                                    * sizeof 
*tem->bounding_rects);
+                     tem->n_bounding_rects = 0;
+
+                     for (; bounding_rect_iterator.rem; xcb_rectangle_next 
(&bounding_rect_iterator))
+                       {
+                         tem->bounding_rects[tem->n_bounding_rects].x
+                           = bounding_rect_iterator.data->x;
+                         tem->bounding_rects[tem->n_bounding_rects].y
+                           = bounding_rect_iterator.data->y;
+                         tem->bounding_rects[tem->n_bounding_rects].width
+                           = bounding_rect_iterator.data->width;
+                         tem->bounding_rects[tem->n_bounding_rects].height
+                           = bounding_rect_iterator.data->height;
+
+                         tem->n_bounding_rects++;
+                       }
+
+                     free (bounding_rect_reply);
+                   }
+                 else
+                   free (error);
+
+                 if (dpyinfo->xshape_major > 1
+                     || (dpyinfo->xshape_major == 1
+                         && dpyinfo->xshape_minor >= 1))
+                   {
+                     input_rect_reply = xcb_shape_get_rectangles_reply 
(dpyinfo->xcb_connection,
+                                                                        
input_rect_cookie, &error);
+
+                     if (input_rect_reply)
+                       {
+                         input_rect_iterator
+                           = xcb_shape_get_rectangles_rectangles_iterator 
(input_rect_reply);
+                         tem->n_input_rects = input_rect_iterator.rem + 1;
+                         tem->input_rects = xmalloc (tem->n_input_rects
+                                                     * sizeof 
*tem->input_rects);
+                         tem->n_input_rects = 0;
+
+                         for (; input_rect_iterator.rem; xcb_rectangle_next 
(&input_rect_iterator))
+                           {
+                             tem->input_rects[tem->n_input_rects].x
+                               = input_rect_iterator.data->x;
+                             tem->input_rects[tem->n_input_rects].y
+                               = input_rect_iterator.data->y;
+                             tem->input_rects[tem->n_input_rects].width
+                               = input_rect_iterator.data->width;
+                             tem->input_rects[tem->n_input_rects].height
+                               = input_rect_iterator.data->height;
+
+                             tem->n_input_rects++;
+                           }
+
+                         free (input_rect_reply);
+                       }
+                     else
+                       free (error);
+                   }
+#else
                  x_catch_errors (dpyinfo->display);
                  rects = XShapeGetRectangles (dpyinfo->display,
                                               xse->window,
@@ -15775,6 +15867,7 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                          XFree (rects);
                        }
                    }
+#endif
 #endif
 
                  /* Handle the common case where the input shape equals the