internal Channel(BinaryReverseReader reader, Layer layer)
{
Debug.WriteLine("Channel started at " + reader.BaseStream.Position);
Id = reader.ReadInt16();
Length = reader.ReadInt32();
_layer = layer;
}
//////////////////////////////////////////////////////////////////
public ImageResource(BinaryReverseReader reader)
{
m_osType = new string(reader.ReadChars(4));
if (m_osType != "8BIM" && m_osType != "MeSa")
{
throw new InvalidOperationException("Could not read an image resource");
}
m_id = reader.ReadInt16();
m_name = reader.ReadPascalString();
uint settingLength = reader.ReadUInt32();
m_data = reader.ReadBytes((int)settingLength);
if (reader.BaseStream.Position % 2 == 1)
reader.ReadByte();
}
///////////////////////////////////////////////////////////////////////////
private void LoadImage(BinaryReverseReader reader)
{
Debug.WriteLine("LoadImage started at " + reader.BaseStream.Position.ToString());
m_imageCompression = (ImageCompression)reader.ReadInt16();
m_imageData = new byte[m_channels][];
//---------------------------------------------------------------
if (m_imageCompression == ImageCompression.Rle)
{
// The RLE-compressed data is proceeded by a 2-byte data count for each row in the data,
// which we're going to just skip.
reader.BaseStream.Position += m_rows * m_channels * 2;
}
//---------------------------------------------------------------
int bytesPerRow = 0;
switch (m_depth)
{
case 1:
bytesPerRow = m_columns;//NOT Shure
break;
case 8:
bytesPerRow = m_columns;
break;
case 16:
bytesPerRow = m_columns * 2;
break;
}
//---------------------------------------------------------------
for (int ch = 0; ch < m_channels; ch++)
{
m_imageData[ch] = new byte[m_rows * bytesPerRow];
switch (m_imageCompression)
{
case ImageCompression.Raw:
reader.Read(m_imageData[ch], 0, m_imageData[ch].Length);
break;
case ImageCompression.Rle:
{
for (int i = 0; i < m_rows; i++)
{
int rowIndex = i * m_columns;
RleHelper.DecodedRow(reader.BaseStream, m_imageData[ch], rowIndex, bytesPerRow);
}
}
break;
default:
break;
}
}
}
///////////////////////////////////////////////////////////////////////////
private void LoadLayers(BinaryReverseReader reader)
{
Debug.WriteLine("LoadLayers started at " + reader.BaseStream.Position.ToString());
uint layersInfoSectionLength = reader.ReadUInt32();
if (layersInfoSectionLength <= 0)
return;
long startPosition = reader.BaseStream.Position;
short numberOfLayers = reader.ReadInt16();
// If <0, then number of layers is absolute value,
// and the first alpha channel contains the transparency data for
// the merged result.
if (numberOfLayers < 0)
{
AbsoluteAlpha = true;
numberOfLayers = Math.Abs(numberOfLayers);
}
m_layers.Clear();
if (numberOfLayers == 0)
return;
for (int i = 0; i < numberOfLayers; i++)
{
m_layers.Add(new Layer(reader, this));
}
foreach (Layer layer in m_layers)
{
foreach (Layer.Channel channel in layer.Channels)
{
if (channel.Id != -2)
channel.LoadPixelData(reader);
}
layer.MaskData.LoadPixelData(reader);
}
//-----------------------------------------------------------------------
if (reader.BaseStream.Position % 2 == 1)
reader.ReadByte();
//-----------------------------------------------------------------------
// make shure we are not on a wrong offset, so set the stream position
// manually
reader.BaseStream.Position = startPosition + layersInfoSectionLength;
}
///////////////////////////////////////////////////////////////////////////
private void LoadHeader(BinaryReverseReader reader)
{
Debug.WriteLine("LoadHeader started at " + reader.BaseStream.Position.ToString());
string signature = new string(reader.ReadChars(4));
if (signature != "8BPS")
throw new IOException("The given stream is not a valid PSD file");
m_version = reader.ReadInt16();
if (m_version != 1)
throw new IOException("The PSD file has an unkown version");
//6 bytes reserved
reader.BaseStream.Position += 6;
m_channels = reader.ReadInt16();
m_rows = reader.ReadInt32();
m_columns = reader.ReadInt32();
m_depth = reader.ReadInt16();
m_colorMode = (ColorModes)reader.ReadInt16();
}
