///////////////////////////////////////////////////////////////////////////
public Layer(PsdFile psdFile)
{
PsdFile = psdFile;
Rect = Rectangle.Empty;
Channels = new ChannelList();
BlendModeKey = PsdBlendMode.Normal;
AdditionalInfo = new List <LayerInfo>();
}
public InfoLayers(PsdFile psdFile, String key)
{
PsdFile = psdFile;
switch (key)
{
// The key does not have to match the bit depth, but it does have to
// be one of the known values.
case "Layr":
case "Lr16":
case "Lr32":
Key = key;
break;
default:
throw new PsdInvalidException(
$"{nameof(InfoLayers)} key must be Layr, Lr16, or Lr32.");
}
}
public InfoLayers(PsdBinaryReader reader, PsdFile psdFile,
String key, Int64 dataLength)
: this(psdFile, key)
{
if (psdFile.Layers.Count > 0)
{
throw new PsdInvalidException(
"Cannot have both regular layers and Additional Info layers");
}
var endPosition = reader.BaseStream.Position + dataLength;
psdFile.LoadLayers(reader, false);
if (reader.BaseStream.Position != endPosition)
{
throw new PsdInvalidException(
$"Incorrect length for {nameof(InfoLayers)}.");
}
}
public virtual void OnLoadLayersHeader(PsdFile psdFile)
{
}
public Layer(PsdBinaryReader reader, PsdFile psdFile)
: this(psdFile)
{
Util.DebugMessage(reader.BaseStream, "Load, Begin, Layer");
Rect = reader.ReadRectangle();
//-----------------------------------------------------------------------
// Read channel headers. Image data comes later, after the layer header.
Int32 numberOfChannels = reader.ReadUInt16();
for (Int32 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
Int64 adjustmentLayerEndPos = extraDataStartPosition + extraDataSize;
while (reader.BaseStream.Position < adjustmentLayerEndPos)
{
var layerInfo = LayerInfoFactory.Load(reader,
psdFile: PsdFile,
globalLayerInfo: false);
AdditionalInfo.Add(layerInfo);
}
foreach (var adjustmentInfo in AdditionalInfo)
{
switch (adjustmentInfo.Key)
{
case "luni":
Name = ((LayerUnicodeName)adjustmentInfo).Name;
break;
}
}
Util.DebugMessage(reader.BaseStream, "Load, End, Layer, {0}", Name);
PsdFile.LoadContext.OnLoadLayerHeader(this);
}
/// <summary>
/// Loads the next LayerInfo record.
/// </summary>
/// <param name="reader">The file reader</param>
/// <param name="psdFile">The PSD file.</param>
/// <param name="globalLayerInfo">True if the LayerInfo record is being
/// loaded from the end of the Layer and Mask Information section;
/// false if it is being loaded from the end of a Layer record.</param>
public static LayerInfo Load(PsdBinaryReader reader, PsdFile psdFile,
Boolean globalLayerInfo)
{
Util.DebugMessage(reader.BaseStream, "Load, Begin, LayerInfo");
// Some keys use a signature of 8B64, but the identity of these keys
// is undocumented. We will therefore accept either signature.
var signature = reader.ReadAsciiChars(4);
if ((signature != "8BIM") && (signature != "8B64"))
{
throw new PsdInvalidException(
$"{nameof(LayerInfo)} signature invalid, must be 8BIM or 8B64.");
}
var key = reader.ReadAsciiChars(4);
var hasLongLength = LayerInfoUtil.HasLongLength(key, psdFile.IsLargeDocument);
var length = hasLongLength
? reader.ReadInt64()
: reader.ReadInt32();
var startPosition = reader.BaseStream.Position;
LayerInfo result;
switch (key)
{
case "Layr":
case "Lr16":
case "Lr32":
result = new InfoLayers(reader, psdFile, key, length);
break;
case "lsct":
case "lsdk":
result = new LayerSectionInfo(reader, key, (Int32)length);
break;
case "luni":
result = new LayerUnicodeName(reader);
break;
default:
result = new RawLayerInfo(reader, signature, 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.
//
// Photoshop writes data that is always 4-padded, even when the stated
// length is not a multiple of 4. The length mismatch seems to occur
// only on global layer info. We do not read extra padding in other
// cases because third-party programs are likely to follow the spec.
if (globalLayerInfo)
{
reader.ReadPadding(startPosition, 4);
}
Util.DebugMessage(reader.BaseStream, "Load, End, LayerInfo, {0}, {1}",
result.Signature, result.Key);
return(result);
}
