[pango/wip/baedert/for-master2: 3/17] layout: Try to avoid some work when creating iters

[Timm Bäder <baedert src gnome org>]

commit 03774a47fda0231fae38f44e68e05deaf9ca95dc
Author: Timm Bäder <mail baedert org>
Date:   Tue Apr 14 17:43:35 2020 +0200

    layout: Try to avoid some work when creating iters
    
    Instead of getting the logical rect and then not using it, try not to
    compute it in the first place.

 pango/pango-layout.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)
---
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index 872ccd71..ee754835 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -6183,7 +6183,6 @@ _pango_layout_get_iter (PangoLayout    *layout,
                         PangoLayoutIter*iter)
 {
   int run_start_index;
-  PangoRectangle logical_rect;
 
   g_return_if_fail (PANGO_IS_LAYOUT (layout));
 
@@ -6207,11 +6206,25 @@ _pango_layout_get_iter (PangoLayout    *layout,
     iter->run = NULL;
 
   iter->line_extents = NULL;
-  pango_layout_get_extents_internal (layout,
-                                    NULL,
-                                    &logical_rect,
-                                    &iter->line_extents);
-  iter->layout_width = layout->width == -1 ? logical_rect.width : layout->width;
+
+  if (layout->width == -1)
+    {
+      PangoRectangle logical_rect;
+
+      pango_layout_get_extents_internal (layout,
+                                         NULL,
+                                         &logical_rect,
+                                         &iter->line_extents);
+      iter->layout_width = logical_rect.width;
+    }
+  else
+    {
+      pango_layout_get_extents_internal (layout,
+                                         NULL,
+                                         NULL,
+                                         &iter->line_extents);
+      iter->layout_width = layout->width;
+    }
   iter->line_index = 0;
 
   update_run (iter, run_start_index);