makeDetailsMask() "maxBlanks" temp var

Meter.c

@@ -503,9 +503,7 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
    assert(rem >= 0.0);
    assert(rem < 1.0);
 
-   // If "rem" is not zero, it should have a minimum value so that
-   // (1.0 - rem) will not round to 1.0.
-   assert(rem <= 0.0 || rem >= (1.0 / UINT8_MAX));
+   double maxBlanks = (1.0 - rem) * 8.0;
 
    uint8_t blanksAtEnd;
    bool roundsUpInAscii = false;
@@ -515,14 +513,13 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
       blanksAtEnd = (uint8_t)blanksAtTopCell;
       roundsUpInAscii = true;
    } else if (prev->nCellsPainted == 0 || prev->topPoint <= prev->nCellsPainted) {
-      blanksAtEnd = (uint8_t)((1.0 - rem) * 8.0) % 8;
+      blanksAtEnd = (uint8_t)maxBlanks % 8;
    } else if (new->nCellsPainted > new->topPoint) {
       assert(new->nCellsPainted - new->topPoint < 1.0);
       // 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 = (1.0 - rem) * 8.0;
-      fraction -= (int)fraction;
+      double fraction = maxBlanks - (int)maxBlanks;
       double distance = (new->nCellsPainted - new->topPoint) * 8.0 + (1.0 - fraction) * 0.5;
       blanksAtEnd = (uint8_t)distance;
 
@@ -539,7 +536,7 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
 
    uint8_t blanksAtStart;
    if (prev->nCellsPainted > 0) {
-      blanksAtStart = (uint8_t)((int)((1.0 - rem) * 8.0) - blanksAtEnd) % 8;
+      blanksAtStart = (uint8_t)((int)maxBlanks - blanksAtEnd) % 8;
    } else {
       // Always zero blanks for the first cell.
       // When an item would be painted with all cells (from the first cell to