public static LayerInfo Load(PsdBinaryReader reader)
{
Debug.WriteLine("LayerInfoFactory.Load started at " + reader.BaseStream.Position);
var signature = reader.ReadAsciiChars(4);
if (signature != "8BIM")
{
throw new PsdInvalidException("Could not read LayerInfo due to signature mismatch.");
}
var key = reader.ReadAsciiChars(4);
var length = reader.ReadInt32();
var startPosition = reader.BaseStream.Position;
LayerInfo result;
switch (key)
{
case "lsct":
case "lsdk":
result = new LayerSectionInfo(reader, key, length);
break;
case "luni":
result = new LayerUnicodeName(reader);
break;
case "TySh":
result = new LayerText(reader, length);
break;
case "tySH":
result = new LayerTextType(reader);
break;
case "lrFX":
result = new EffectsLayer(reader, key);
break;
case "shmd":
result = new MetadataSetting(reader);
break;
case "lfx2":
result = new ObjectBasedEffect(reader, length);
break;
default:
result = new RawLayerInfo(reader, key, length);
break;
}
// May have additional padding applied.
var endPosition = startPosition + length;
if (reader.BaseStream.Position < endPosition)
{
reader.BaseStream.Position = endPosition;
}
// Documentation states that the length is even-padded. Actually:
// 1. Most keys have 4-padded lengths.
// 2. However, some keys (LMsk) have even-padded lengths.
// 3. Other keys (Txt2, Lr16, Lr32) have unpadded lengths.
//
// The data is always 4-padded, regardless of the stated length.
reader.ReadPadding(startPosition, 4);
return(result);
}
public Layer(PsdBinaryReader reader, PsdFile psdFile)
: this(psdFile)
{
IsText = false;
Rect = reader.ReadRectangle();
//-----------------------------------------------------------------------
// Read channel headers. Image data comes later, after the layer header.
int numberOfChannels = reader.ReadUInt16();
for (int channel = 0; channel < numberOfChannels; channel++)
{
var ch = new Channel(reader, this);
Channels.Add(ch);
}
//-----------------------------------------------------------------------
//
var signature = reader.ReadAsciiChars(4);
if (signature != "8BIM")
{
throw (new PsdInvalidException("Invalid signature in layer header."));
}
BlendModeKey = reader.ReadAsciiChars(4);
Opacity = reader.ReadByte();
Clipping = reader.ReadBoolean();
var flagsByte = reader.ReadByte();
flags = new BitVector32(flagsByte);
reader.ReadByte(); //padding
//-----------------------------------------------------------------------
// This is the total size of the MaskData, the BlendingRangesData, the
// Name and the AdjustmentLayerInfo.
var extraDataSize = reader.ReadUInt32();
var extraDataStartPosition = reader.BaseStream.Position;
Masks = new MaskInfo(reader, this);
BlendingRangesData = new BlendingRanges(reader, this);
Name = reader.ReadPascalString(4);
//-----------------------------------------------------------------------
// Process Additional Layer Information
long adjustmentLayerEndPos = extraDataStartPosition + extraDataSize;
while (reader.BaseStream.Position < adjustmentLayerEndPos)
{
var layerInfo = LayerInfoFactory.Load(reader);
AdditionalInfo.Add(layerInfo);
}
foreach (var adjustmentInfo in AdditionalInfo)
{
switch (adjustmentInfo.Key)
{
case "luni":
Name = ((LayerUnicodeName)adjustmentInfo).Name;
break;
case "TySh":
IsText = true;
LayerText = (LayerText)adjustmentInfo;
break;
case "lrFX":
Effects = (EffectsLayer)adjustmentInfo;
break;
case "lfx2":
BaseEffect = (ObjectBasedEffect)adjustmentInfo;
break;
}
}
}