makeDetailsMask() use ceil() (k2)

Meter.c

@@ -503,7 +503,8 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
    assert(rem >= 0.0);
    assert(rem < 1.0);
 
-   double maxBlanks = (1.0 - rem) * 8.0;
+   double numDots = ceil(rem * 8.0);
+   double maxBlanks = 8.0 - numDots;
 
    uint8_t blanksAtEnd;
    bool roundsUpInAscii = false;
@@ -519,8 +520,17 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
       // Unlike other conditions, this one rounds to nearest for visual reason.
       // In case of a tie, display the dot at lower position of the graph,
       // i.e. MSB of the "details" data.
-      double fraction = maxBlanks - (int)maxBlanks;
-      double distance = (new->nCellsPainted - new->topPoint) * 8.0 + (1.0 - fraction) * 0.5;
+
+      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;
 
       // Tiebreaking direction that may be needed in the ASCII display mode.