[mutter] clutter/stage: Don't loose precision when setting up viewport

[Jonas Ådahl <jadahl src gnome org>]

commit 0adc56779f9bc97e61d5fd89f02e12e33baa8105
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Jun 8 10:05:05 2017 +0800

    clutter/stage: Don't loose precision when setting up viewport
    
    We always hit non-fractional floats here because the stage views are
    always made so that they are aligned on integer positions with integer
    sizes, but there is no reason to go float -> int -> float when
    calculating the viewport.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765011

 clutter/clutter/clutter-stage.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index 43bcb8b..1fa7626 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -1446,8 +1446,8 @@ _clutter_stage_do_pick_on_view (ClutterStage     *stage,
   gint read_y;
   float fb_width, fb_height;
   float fb_scale;
-  int viewport_offset_x;
-  int viewport_offset_y;
+  float viewport_offset_x;
+  float viewport_offset_y;
 
   priv = stage->priv;
 
@@ -3623,8 +3623,8 @@ _clutter_stage_maybe_setup_viewport (ClutterStage     *stage,
       cairo_rectangle_int_t view_layout;
       ClutterPerspective perspective;
       float fb_scale;
-      int viewport_offset_x;
-      int viewport_offset_y;
+      float viewport_offset_x;
+      float viewport_offset_y;
       float z_2d;
 
       CLUTTER_NOTE (PAINT,