From 97185345fa9e3277408070227c9e02e986b5fddc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alberts=20Muktup=C4=81vels?= <alberts.muktupavels@gmail.com>
Date: Thu, 14 Apr 2016 14:39:01 +0300
Subject: compositor: add client_region

---
 src/compositor/compositor-xrender.c | 79 +++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/src/compositor/compositor-xrender.c b/src/compositor/compositor-xrender.c
index cc0bb43d..71124341 100644
--- a/src/compositor/compositor-xrender.c
+++ b/src/compositor/compositor-xrender.c
@@ -175,6 +175,7 @@ typedef struct _MetaCompWindow
   Picture shadow_pict;
 
   XserverRegion frame_region;
+  XserverRegion client_region;
 
   XserverRegion window_size;
   XserverRegion extents;
@@ -1135,6 +1136,68 @@ get_frame_region (MetaCompWindow *cw)
   return frame_region;
 }
 
+static XserverRegion
+get_client_region (MetaCompWindow *cw)
+{
+  MetaScreen *screen;
+  MetaDisplay *display;
+  Display *xdisplay;
+  XserverRegion frame_region;
+  MetaFrame *frame;
+
+  screen = cw->screen;
+  display = meta_screen_get_display (screen);
+  xdisplay = meta_display_get_xdisplay (display);
+
+  if (cw->frame_region != None)
+    {
+      frame_region = XFixesCreateRegion (xdisplay, NULL, 0);
+      XFixesCopyRegion (xdisplay, frame_region, cw->frame_region);
+    }
+  else
+    {
+      meta_error_trap_push (display);
+      frame_region = XFixesCreateRegionFromWindow (xdisplay, cw->id,
+                                                   WindowRegionBounding);
+
+      meta_error_trap_pop (display, FALSE);
+      if (frame_region == None)
+        return None;
+
+      XFixesTranslateRegion (xdisplay, frame_region,
+                             cw->attrs.x + cw->attrs.border_width,
+                             cw->attrs.y + cw->attrs.border_width);
+    }
+
+  frame = cw->window ? meta_window_get_frame (cw->window) : NULL;
+
+  if (frame != NULL)
+    {
+      MetaFrameBorders borders;
+      int width;
+      int height;
+      XRectangle client_rect;
+      XserverRegion client_region;
+
+      meta_frame_calc_borders (frame, &borders);
+
+      width = cw->attrs.width + cw->attrs.border_width * 2;
+      height = cw->attrs.height + cw->attrs.border_width * 2;
+
+      client_rect.x = cw->attrs.x + borders.total.left;
+      client_rect.y = cw->attrs.y + borders.total.top;
+      client_rect.width = width - borders.total.left - borders.total.right;
+      client_rect.height = height - borders.total.top - borders.total.bottom;
+
+      client_region = XFixesCreateRegion (xdisplay, &client_rect, 1);
+
+      XFixesIntersectRegion (xdisplay, frame_region, client_region, frame_region);
+      XFixesDestroyRegion (xdisplay, client_region);
+    }
+
+  return frame_region;
+}
+
 static XserverRegion
 window_size (MetaCompWindow *cw)
 {
@@ -1345,6 +1408,12 @@ paint_windows (MetaScreen   *screen,
               cw->frame_region = None;
             }
 
+          if (cw->client_region)
+            {
+              XFixesDestroyRegion (xdisplay, cw->client_region);
+              cw->client_region = None;
+            }
+
           if (cw->window_size)
             {
               XFixesDestroyRegion (xdisplay, cw->window_size);
@@ -1363,6 +1432,9 @@ paint_windows (MetaScreen   *screen,
       if (cw->frame_region == None)
         cw->frame_region = get_frame_region (cw);
 
+      if (cw->client_region == None)
+        cw->client_region = get_client_region (cw);
+
       if (cw->window_size == None)
         cw->window_size = window_size (cw);
 
@@ -1711,6 +1783,12 @@ free_win (MetaCompWindow *cw,
       cw->frame_region = None;
     }
 
+  if (cw->client_region)
+    {
+      XFixesDestroyRegion (xdisplay, cw->client_region);
+      cw->client_region = None;
+    }
+
   if (cw->window_size)
     {
       XFixesDestroyRegion (xdisplay, cw->window_size);
@@ -1986,6 +2064,7 @@ add_win (MetaScreen *screen,
   cw->shadow_pict = None;
 
   cw->frame_region = None;
+  cw->client_region = None;
 
   cw->window_size = None;
   cw->extents = None;
-- 
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