makeDetailsMask() use ceil() (p1)

Meter.c

@@ -521,24 +521,16 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
       // In case of a tie, display the dot at lower position of the graph,
       // i.e. MSB of the "details" data.
 
-      double fraction = (rem * 8.0) - (numDots - 1.0);
-      assert(fraction > 0.0);
-      assert(fraction <= 1.0);
-
-      double distance;
-      if (new->nCellsPainted > 1) {
-         distance = (new->nCellsPainted - new->topPoint) * 8.0 + fraction * 0.5;
-      } else {
-         distance = new->nCellsPainted * 8.0 + (fraction * 0.5 - new->topPoint * 8.0);
-      }
-      blanksAtEnd = (uint8_t)distance;
+      double distance = new->topPoint - (new->nCellsPainted - 1);
+      distance = distance - rem * 0.5;
 
       // Tiebreaking direction that may be needed in the ASCII display mode.
-      distance = distance - (int)distance;
-      assert(distance >= 0.0);
-      assert(distance < 1.0);
-      roundsUpInAscii = distance < 0.5;
-      roundsDownInAscii = distance > 0.5;
+      roundsUpInAscii = distance > 0.5;
+      roundsDownInAscii = distance < 0.5;
+
+      double fraction = (uint8_t)numDots % 2 > 0 ? 0.5 : 0.0;
+      distance = ceil(distance * 8.0 - fraction);
+      blanksAtEnd = 8.0 - distance - (uint8_t)numDots / 2;
    } else {
       blanksAtEnd = 0;
    }