[gtk+] Handle off-by-one errors due to rounding

[Kristian Rietveld <kristian src gnome org>]

commit 65c3fc99536ead0f755b027043eaa2e2052bf0ef
Author: Kristian Rietveld <kris gtk org>
Date:   Tue Oct 12 17:39:26 2010 +0200

    Handle off-by-one errors due to rounding

 gtk/tests/treeview-scrolling.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/gtk/tests/treeview-scrolling.c b/gtk/tests/treeview-scrolling.c
index ef7f12c..19c5dc2 100644
--- a/gtk/tests/treeview-scrolling.c
+++ b/gtk/tests/treeview-scrolling.c
@@ -26,6 +26,7 @@
 
 #include <gtk/gtk.h>
 #include <unistd.h>
+#include <math.h>
 
 #define VIEW_WIDTH 320
 #define VIEW_HEIGHT 240
@@ -250,7 +251,7 @@ get_row_start_for_index (GtkTreeView *tree_view, int index)
 static enum Pos
 get_pos_from_path (GtkTreeView   *tree_view,
 		   GtkTreePath   *path,
-		   gint           row_height,
+		   gdouble        row_height,
 		   GtkAdjustment *vadj)
 {
 	int row_start;
@@ -272,7 +273,7 @@ test_position_with_align (GtkTreeView  *tree_view,
 			  enum Pos      pos,
 			  gint          row_y,
 			  gint          row_start,
-			  gint          row_height,
+			  gdouble       row_height,
 			  gdouble       row_align)
 {
 	gboolean passed = TRUE;
@@ -333,7 +334,8 @@ test_position_with_align (GtkTreeView  *tree_view,
 			 *      (ie. the row's center is at the
 			 *       center of the view).
 			 */
-			if (row_y != (int)(vadj->page_size / 2 - row_height / 2))
+			gdouble middle = vadj->page_size / 2 - row_height / 2;
+			if (row_y != ceil (middle) && row_y != floor (middle))
 				passed = FALSE;
 		}
 		break;
@@ -372,8 +374,8 @@ test_position_with_align (GtkTreeView  *tree_view,
 
 static gboolean
 test_position_without_align (GtkTreeView *tree_view,
-			     gint         row_start,
-			     gint         row_height)
+			     gdouble      row_start,
+			     gdouble      row_height)
 {
 	GtkAdjustment *vadj = gtk_tree_view_get_vadjustment (tree_view);