Slightly improve scrollbar position accounting on Haiku

* src/haiku_support.cc (MessageReceived): Use floats for
calculating portion and subtract proportion directly.
* src/haikuterm.c (haiku_set_scroll_bar_thumb): Take ceiling of
value instead of rounding it.

2 files changed, 4 insertions, 4 deletions

diff --git a/src/haiku_support.cc b/src/haiku_support.cc
index dcea69bb9a7..07e3ee2bb64 100644
--- a/src/haiku_support.cc
+++ b/src/haiku_support.cc
@@ -1578,20 +1578,20 @@ public:
   MessageReceived (BMessage *msg)
   {
     int32 portion, range;
-    double proportion;
+    float proportion;
 
     if (msg->what == SCROLL_BAR_UPDATE)
       {
         old_value = msg->GetInt32 ("emacs:units", 0);
         portion = msg->GetInt32 ("emacs:portion", 0);
         range = msg->GetInt32 ("emacs:range", 0);
-        proportion = (double) portion / range;
+        proportion = (float) portion / range;
 
         if (!msg->GetBool ("emacs:dragging", false))
           {
             /* Unlike on Motif, PORTION isn't included in the total
                range of the scroll bar.  */
-            this->SetRange (0, std::floor ((double) range - (range * proportion)));
+            this->SetRange (0, range - portion);
             this->SetValue (old_value);
             this->SetProportion (proportion);
           }
diff --git a/src/haikuterm.c b/src/haikuterm.c
index 119c54b17ac..4ecc738898e 100644
--- a/src/haikuterm.c
+++ b/src/haikuterm.c
@@ -485,7 +485,7 @@ haiku_set_scroll_bar_thumb (struct scroll_bar *bar, int portion,
     }
 
   BView_scroll_bar_update (scroll_bar, lrint (size),
-                           BE_SB_MAX, lrint (value), bar->dragging);
+                           BE_SB_MAX, ceil (value), bar->dragging);
 }
 
 static void