/// <summary>
/// Map LSCP to host CP, and return the last LSRun
/// before the specified limit.
/// </summary>
internal LSRun CountText(
int lscpLim,
int cpFirst,
out int count
)
{
LSRun lastRun = null;
count = 0;
int lsccp = lscpLim - _store.CpFirst;
Debug.Assert(lsccp > 0, "Zero-length text line!");
foreach (Span span in _store.PlsrunVector)
{
if (lsccp <= 0)
{
break;
}
Plsrun plsrun = (Plsrun)span.element;
// There should be no marker runs in _plsrunVector.
Debug.Assert(!TextStore.IsMarker(plsrun));
// Is it a normal, non-static, LSRun?
if (plsrun >= Plsrun.FormatAnchor)
{
// Get the run and remember the last run.
lastRun = _store.GetRun(plsrun);
// Accumulate the length.
int cpRun = lastRun.Length;
if (cpRun > 0)
{
if (lsccp < span.length && cpRun == span.length)
{
count += lsccp;
break;
}
count += cpRun;
}
}
lsccp -= span.length;
}
// make char count relative to cpFirst as the cpFirst of this metrics may not
// be the same as the cpFirst of the store in optimal paragraph formatting.
count = count - cpFirst + _store.CpFirst;
return(lastRun);
}