|
private GetFontData ( |
||
| hdc | ||
| dwTable | uint | |
| dwOffset | uint | |
| lpvBuffer | [ | |
| cbData | uint | |
| return | uint | |
/// <summary>
/// Gets font metric data for a TrueType font or TrueType collection.
/// </summary>
/// <returns></returns>
public byte[] GetFontData()
{
if (data == null)
{
try {
// Check if this is a TrueType font collection
uint ttcfTag = TableNames.ToUint(TableNames.Ttcf);
uint ttcfSize = LibWrapper.GetFontData(dc.Handle, ttcfTag, 0, null, 0);
if (ttcfSize != 0 && ttcfSize != 0xFFFFFFFF)
{
data = ReadFontFromCollection();
}
else
{
data = ReadFont();
}
}
catch (Exception e) {
throw new Exception(
String.Format("Failed to load data for font {0}", FaceName), e);
}
}
return(data);
}
private byte[] ReadTableData(string tableName)
{
uint tag = TableNames.ToUint(tableName);
uint size = LibWrapper.GetFontData(dc.Handle, tag, 0, null, 0);
byte[] data = new byte[size];
uint rv = LibWrapper.GetFontData(dc.Handle, tag, 0, data, (uint)data.Length);
if (rv == GdiFontMetrics.GDI_ERROR)
{
throw new Exception("Failed to retrieve table " + tableName);
}
return(data);
}
private byte[] ReadFont()
{
uint bufferSize = LibWrapper.GetFontData(dc.Handle, 0, 0, null, 0);
if (bufferSize == 0xFFFFFFFF)
{
throw new InvalidOperationException("No font selected into device context");
}
byte[] buffer = new byte[bufferSize];
uint rv = LibWrapper.GetFontData(dc.Handle, 0, 0, buffer, bufferSize);
if (rv == GDI_ERROR)
{
throw new Exception("Failed to retrieve table data for font " + FaceName);
}
return(buffer);
}