/// <summary>
/// Resolves the zone offsets for the location and text
/// </summary>
internal void ResolveOffsets(TextZone parent, TextZone sibling)
{
if (parent == null && sibling == null)
{
return;
}
if (sibling == null)
{
X += parent.Rectangle.Right;
Y = parent.Rectangle.Top - (Y + Height);
TextOffset += parent.TextOffset;
}
else
{
if (sibling.ZoneType == ZoneTypes.Page || sibling.ZoneType == ZoneTypes.Paragraph ||
sibling.ZoneType == ZoneTypes.Line)
{
X += sibling.Rectangle.Right;
Y = sibling.Rectangle.Bottom - (Y + Height);
}
else if (sibling.ZoneType == ZoneTypes.Column || sibling.ZoneType == ZoneTypes.Word ||
sibling.ZoneType == ZoneTypes.Character)
{
X += sibling.Rectangle.Left;
Y += sibling.Rectangle.Bottom;
}
TextOffset += sibling.TextOffset + sibling.TextLength;
}
}
public TextZone(IDjvuReader reader, TextZone parent, TextZone sibling, TextChunk chunkParent)
{
Parent = parent;
ChunkParent = chunkParent;
DecodeZoneData(reader, sibling, chunkParent);
}
/// <summary>
/// Decodes the data for the zone
/// </summary>
/// <param name="reader"></param>
internal void DecodeZoneData(IDjvuReader reader, TextZone sibling, TextChunk chunkParent)
{
ZoneType = (ZoneTypes)reader.ReadByte();
X = reader.ReadUInt16BigEndian() - 0x8000;
Y = reader.ReadUInt16BigEndian() - 0x8000;
Width = reader.ReadUInt16BigEndian() - 0x8000;
Height = reader.ReadUInt16BigEndian() - 0x8000;
TextOffset = reader.ReadUInt16BigEndian() - 0x8000;
TextLength = reader.ReadInt24BigEndian();
ResolveOffsets(Parent, sibling);
Rectangle = new Rectangle(X, Y, Width, Height);
int childrenZones = reader.ReadInt24BigEndian();
List <TextZone> children = new List <TextZone>();
TextZone childrenSibling = null;
for (int x = 0; x < childrenZones; x++)
{
TextZone newZone = new TextZone(reader, this, childrenSibling, chunkParent);
childrenSibling = newZone;
children.Add(newZone);
}
Children = children.ToArray();
}
/// <summary>
/// Reads the compressed text data
/// </summary>
internal void ReadCompressedTextData()
{
if (Length > 0)
{
using (IDjvuReader reader = GetTextDataReader(DataOffset))
{
int length = (int)reader.ReadUInt24BigEndian();
byte[] textBytes = reader.ReadBytes(length);
Text = Encoding.UTF8.GetString(textBytes);
TextLength = _text.Length;
Version = reader.ReadByte();
Zone = new TextZone(reader, null, null, this);
}
}
_isDecoded = true;
}
