/**
* This will read the required data from the stream.
*
* @param ttf The font that is being read.
* @param data The stream to read the data from.
* @ If there is an error reading the data.
*/
public override void Read(TrueTypeFont ttf, TTFDataStream data)
{
VerticalHeaderTable vHeader = ttf.VerticalHeader;
if (vHeader == null)
{
throw new IOException("Could not get vhea table");
}
numVMetrics = vHeader.NumberOfVMetrics;
int numGlyphs = ttf.NumberOfGlyphs;
int bytesRead = 0;
advanceHeight = new int[numVMetrics];
topSideBearing = new short[numVMetrics];
for (int i = 0; i < numVMetrics; i++)
{
advanceHeight[i] = data.ReadUnsignedShort();
topSideBearing[i] = data.ReadSignedShort();
bytesRead += 4;
}
if (bytesRead < Length)
{
int numberNonVertical = numGlyphs - numVMetrics;
// handle bad fonts with too many vmetrics
if (numberNonVertical < 0)
{
numberNonVertical = numGlyphs;
}
additionalTopSideBearing = new short[numberNonVertical];
for (int i = 0; i < numberNonVertical; i++)
{
if (bytesRead < Length)
{
additionalTopSideBearing[i] = data.ReadSignedShort();
bytesRead += 2;
}
}
}
initialized = true;
}
private TTFTable ReadTableDirectory(TrueTypeFont font, TTFDataStream raf)
{
TTFTable table;
string tag = raf.ReadString(4);
switch (tag)
{
case CmapTable.TAG:
table = new CmapTable(font);
break;
case GlyphTable.TAG:
table = new GlyphTable(font);
break;
case HeaderTable.TAG:
table = new HeaderTable(font);
break;
case HorizontalHeaderTable.TAG:
table = new HorizontalHeaderTable(font);
break;
case HorizontalMetricsTable.TAG:
table = new HorizontalMetricsTable(font);
break;
case IndexToLocationTable.TAG:
table = new IndexToLocationTable(font);
break;
case MaximumProfileTable.TAG:
table = new MaximumProfileTable(font);
break;
case NamingTable.TAG:
table = new NamingTable(font);
break;
case OS2WindowsMetricsTable.TAG:
table = new OS2WindowsMetricsTable(font);
break;
case PostScriptTable.TAG:
table = new PostScriptTable(font);
break;
case DigitalSignatureTable.TAG:
table = new DigitalSignatureTable(font);
break;
case KerningTable.TAG:
table = new KerningTable(font);
break;
case VerticalHeaderTable.TAG:
table = new VerticalHeaderTable(font);
break;
case VerticalMetricsTable.TAG:
table = new VerticalMetricsTable(font);
break;
case VerticalOriginTable.TAG:
table = new VerticalOriginTable(font);
break;
case GlyphSubstitutionTable.TAG:
table = new GlyphSubstitutionTable(font);
break;
default:
table = ReadTable(font, tag);
break;
}
table.Tag = tag;
table.CheckSum = raf.ReadUnsignedInt();
table.Offset = raf.ReadUnsignedInt();
table.Length = raf.ReadUnsignedInt();
// skip tables with zero length (except glyf)
if (table.Length == 0 && !tag.Equals(GlyphTable.TAG, StringComparison.Ordinal))
{
return(null);
}
return(table);
}