[gtk] renderborder: Make simple border case more obvious

[Matthias Clasen <matthiasc src gnome org>]

commit b1d64a6b3a6d16904104772e3a86294897acf41b
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 29 10:40:10 2020 +0100

    renderborder: Make simple border case more obvious
    
    When reaching this point, it is impossible that all border styles are
    HIDDEN or NONE, but up to 3 of them can still be that style. In any
    case, the "none or solid" border style is the most common on there is,
    so try to make this simpler here by just appending a border node
    directly instead of going through the snapshot_border path.

 gtk/gtkrenderborder.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkrenderborder.c b/gtk/gtkrenderborder.c
index 1396e7833e..a137d0814c 100644
--- a/gtk/gtkrenderborder.c
+++ b/gtk/gtkrenderborder.c
@@ -707,12 +707,26 @@ gtk_css_style_snapshot_border (GtkCssBoxes *boxes,
       border_width[3] = _gtk_css_number_value_get (border->border_left_width, 100);
 
       gtk_snapshot_push_debug (snapshot, "CSS border");
-      snapshot_border (snapshot,
-                       gtk_css_boxes_get_border_box (boxes),
-                       border_width,
-                       colors,
-                       border_style);
-      gtk_snapshot_pop (snapshot);
+      if (border_style[0] <= GTK_BORDER_STYLE_SOLID &&
+          border_style[1] <= GTK_BORDER_STYLE_SOLID &&
+          border_style[2] <= GTK_BORDER_STYLE_SOLID &&
+          border_style[3] <= GTK_BORDER_STYLE_SOLID)
+        {
+          /* The most common case of a solid border */
+          gtk_snapshot_append_border (snapshot,
+                                      gtk_css_boxes_get_border_box (boxes),
+                                      border_width,
+                                      colors);
+        }
+      else
+        {
+          snapshot_border (snapshot,
+                           gtk_css_boxes_get_border_box (boxes),
+                           border_width,
+                           colors,
+                           border_style);
+        }
+       gtk_snapshot_pop (snapshot);
     }
 }