private static void PersistColorAndTransparency(DrawingAttributes da, Stream stream, GuidList guidList, ref uint cbData, ref BinaryWriter bw)
{
// if the color is non-default (e.g. not black), then store it
// the v1 encoder throws away the default color (Black) so it isn't valuable
// to save.
if (da.ContainsPropertyData(KnownIds.Color))
{
Color daColor = da.Color;
System.Diagnostics.Debug.Assert(da.Color != (Color)DrawingAttributes.GetDefaultDrawingAttributeValue(KnownIds.Color), "Color was put in the EPC for the default value!");
//Note: we don't store the alpha value of the color (we don't use it)
uint r = (uint)daColor.R, g = (uint)daColor.G, b = (uint)(daColor.B);
uint colorVal = r + (g << Native.BitsPerByte) + (b << (Native.BitsPerByte * 2));
Debug.Assert(bw != null);
cbData += SerializationHelper.Encode(stream, (uint)guidList.FindTag(KnownIds.Color, true));
cbData += SerializationHelper.Encode(stream, colorVal);
}
//set transparency if Color.A is set
byte alphaChannel = da.Color.A;
if (alphaChannel != 255)
{
//note: Color.A is set to 255 by default, which means fully opaque
//transparency is just the opposite - 0 means fully opaque so
//we need to flip the values
int transparency = MathHelper.AbsNoThrow(((int)alphaChannel) - 255);
Debug.Assert(bw != null);
cbData += SerializationHelper.Encode(stream, (uint)guidList.FindTag(KnownIds.Transparency, true));
cbData += SerializationHelper.Encode(stream, Convert.ToUInt32(transparency));
}
}
/// <summary>
/// Loads drawing attributes from a memory buffer.
/// </summary>
/// <param name="stream">Memory buffer to read from</param>
/// <param name="guidList">Guid tags if extended properties are used</param>
/// <param name="maximumStreamSize">Maximum size of buffer to read through</param>
/// <param name="da">The drawing attributes collection to decode into</param>
/// <returns>Number of bytes read</returns>
#else
/// <summary>
/// Loads drawing attributes from a memory buffer.
/// </summary>
/// <param name="stream">Memory buffer to read from</param>
/// <param name="guidList">Guid tags if extended properties are used</param>
/// <param name="maximumStreamSize">Maximum size of buffer to read through</param>
/// <param name="da">The drawing attributes collection to decode into</param>
/// <returns>Number of bytes read</returns>
#endif
internal static uint DecodeAsISF(Stream stream, GuidList guidList, uint maximumStreamSize, DrawingAttributes da)
{
PenTip penTip = PenTip.Default;
PenStyle penStyle = PenStyle.Default;
double stylusWidth = DrawingAttributeSerializer.V1PenWidthWhenWidthIsMissing;
double stylusHeight = DrawingAttributeSerializer.V1PenHeightWhenHeightIsMissing;
uint rasterOperation = DrawingAttributeSerializer.RasterOperationDefaultV1;
int transparency = DrawingAttributeSerializer.TransparencyDefaultV1;
bool widthIsSetInISF = false; //did we find KnownIds.Width?
bool heightIsSetInISF = false; //did we find KnownIds.Height?
uint cbTotal = maximumStreamSize;
while (maximumStreamSize > 0)
{
KnownTagCache.KnownTagIndex tag;
uint uiTag;
// First read the tag
uint cb = SerializationHelper.Decode(stream, out uiTag);
tag = (KnownTagCache.KnownTagIndex)uiTag;
if (maximumStreamSize < cb)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("ISF size is larger than maximum stream size"));
}
maximumStreamSize -= cb;
// Get the guid based on the tag
Guid guid = guidList.FindGuid(tag);
if (guid == Guid.Empty)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Drawing Attribute tag embedded in ISF stream does not match guid table"));
}
uint dw = 0;
if (KnownIds.PenTip == guid)
{
cb = SerializationHelper.Decode(stream, out dw);
penTip = (PenTip)dw;
if (!PenTipHelper.IsDefined(penTip))
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid PenTip value found in ISF stream"));
}
maximumStreamSize -= cb;
}
else if (KnownIds.PenStyle == guid)
{
cb = SerializationHelper.Decode(stream, out dw);
penStyle = (PenStyle)dw;
maximumStreamSize -= cb;
}
else if (KnownIds.DrawingFlags == guid)
{
// Encode the drawing flags with considerations for v2 model
cb = SerializationHelper.Decode(stream, out dw);
DrawingFlags flags = (DrawingFlags)dw;
da.DrawingFlags = flags;
maximumStreamSize -= cb;
}
else if (KnownIds.RasterOperation == guid)
{
uint ropSize = GuidList.GetDataSizeIfKnownGuid(KnownIds.RasterOperation);
if (ropSize == 0)
{
throw new InvalidOperationException(StrokeCollectionSerializer.ISFDebugMessage("ROP data size was not found"));
}
byte[] data = new byte[ropSize];
stream.Read(data, 0, (int)ropSize);
if (data != null && data.Length > 0)
{
//data[0] holds the allowable values of 0-255
rasterOperation = Convert.ToUInt32(data[0]);
}
maximumStreamSize -= ropSize;
}
else if (KnownIds.CurveFittingError == guid)
{
cb = SerializationHelper.Decode(stream, out dw);
da.FittingError = (int)dw;
maximumStreamSize -= cb;
}
else if (KnownIds.StylusHeight == guid || KnownIds.StylusWidth == guid)
{
double _size;
cb = SerializationHelper.Decode(stream, out dw);
_size = (double)dw;
maximumStreamSize -= cb;
if (maximumStreamSize > 0)
{
cb = SerializationHelper.Decode(stream, out dw);
maximumStreamSize -= cb;
if (KnownTagCache.KnownTagIndex.Mantissa == (KnownTagCache.KnownTagIndex)dw)
{
uint cbInSize;
// First thing that is in there is maximumStreamSize of the data
cb = SerializationHelper.Decode(stream, out cbInSize);
maximumStreamSize -= cb;
// in maximumStreamSize is one more than the decoded no
cbInSize++;
if (cbInSize > maximumStreamSize)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("ISF size if greater then maximum stream size"));
}
byte[] in_data = new byte[cbInSize];
uint bytesRead = (uint)stream.Read(in_data, 0, (int)cbInSize);
if (cbInSize != bytesRead)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Read different size from stream then expected"));
}
byte[] out_buffer = Compressor.DecompressPropertyData(in_data);
using (MemoryStream localStream = new MemoryStream(out_buffer))
using (BinaryReader rdr = new BinaryReader(localStream))
{
short sFraction = rdr.ReadInt16();
_size += (double)(sFraction / DrawingAttributes.StylusPrecision);
maximumStreamSize -= cbInSize;
}
}
else
{
// Seek it back by cb
stream.Seek(-cb, SeekOrigin.Current);
maximumStreamSize += cb;
}
}
if (KnownIds.StylusWidth == guid)
{
widthIsSetInISF = true;
stylusWidth = _size;
}
else
{
heightIsSetInISF = true;
stylusHeight = _size;
}
}
else if (KnownIds.Transparency == guid)
{
cb = SerializationHelper.Decode(stream, out dw);
transparency = (int)dw;
maximumStreamSize -= cb;
}
else if (KnownIds.Color == guid)
{
cb = SerializationHelper.Decode(stream, out dw);
Color color = Color.FromRgb((byte)(dw & 0xff), (byte)((dw & 0xff00) >> Native.BitsPerByte), (byte)((dw & 0xff0000) >> (Native.BitsPerByte * 2)));
da.Color = color;
maximumStreamSize -= cb;
}
else if (KnownIds.StylusTipTransform == guid)
{
try
{
object data;
cb = ExtendedPropertySerializer.DecodeAsISF(stream, maximumStreamSize, guidList, tag, ref guid, out data);
Matrix matrix = Matrix.Parse((string)data);
da.StylusTipTransform = matrix;
}
catch (InvalidOperationException) // Matrix.Parse failed.
{
System.Diagnostics.Debug.Assert(false, "Corrupt Matrix in the ExtendedPropertyCollection!");
}
finally
{
maximumStreamSize -= cb;
}
}
else
{
object data;
cb = ExtendedPropertySerializer.DecodeAsISF(stream, maximumStreamSize, guidList, tag, ref guid, out data);
maximumStreamSize -= cb;
da.AddPropertyData(guid, data);
}
}
if (0 != maximumStreamSize)
{
throw new ArgumentException();
}
//
// time to create our drawing attributes.
//
// 1) First we need to evaluate PenTip / StylusTip
// Here is the V1 - V2 mapping
//
// PenTip.Circle == StylusTip.Ellipse
// PenTip.Rectangle == StylusTip.Rectangle
// PenTip.Rectangle == StylusTip.Diamond
if (penTip == PenTip.Default)
{
//Since StylusTip is stored in the EPC at this point (if set), we can compare against it here.
if (da.StylusTip != StylusTip.Ellipse)
{
//
// StylusTip was set to something other than Ellipse
// when we last serialized (or else StylusTip would be Ellipse, the default)
// when StylusTip is != Ellipse and we serialize, we set PenTip to Rectangle
// which is not the default. Therefore, if PenTip is back to Circle,
// that means someone set it in V1 and we should respect that by
// changing StylusTip back to Ellipse
//
da.StylusTip = StylusTip.Ellipse;
}
//else da.StylusTip is already set
}
else
{
System.Diagnostics.Debug.Assert(penTip == PenTip.Rectangle);
if (da.StylusTip == StylusTip.Ellipse)
{
//
// PenTip is Rectangle and StylusTip was either not set
// before or was set to Ellipse and PenTip was changed
// in a V1 ink object. Either way, we need to change StylusTip to Rectangle
da.StylusTip = StylusTip.Rectangle;
}
//else da.StylusTip is already set
}
//
// 2) next we need to set hight and width
//
if (da.StylusTip == StylusTip.Ellipse &&
widthIsSetInISF &&
!heightIsSetInISF)
{
//
// special case: V1 PenTip of Circle only used Width to compute the circle size
// and so it only serializes Width of 53
// but since our default is Ellipse, if Height is unset and we use the default
// height of 30, then your ink that looked like 53,53 in V1 will look
// like 30,53 here.
//
//
stylusHeight = stylusWidth;
da.HeightChangedForCompatabity = true;
}
// need to convert width/height into Avalon, since they are stored in HIMETRIC in ISF
stylusHeight *= StrokeCollectionSerializer.HimetricToAvalonMultiplier;
stylusWidth *= StrokeCollectionSerializer.HimetricToAvalonMultiplier;
// Map 0.0 width to DrawingAttributes.DefaultXXXXXX (V1 53 equivalent)
double height = DoubleUtil.IsZero(stylusHeight) ? (Double)DrawingAttributes.GetDefaultDrawingAttributeValue(KnownIds.StylusHeight) : stylusHeight;
double width = DoubleUtil.IsZero(stylusWidth) ? (Double)DrawingAttributes.GetDefaultDrawingAttributeValue(KnownIds.StylusWidth) : stylusWidth;
da.Height = GetCappedHeightOrWidth(height);
da.Width = GetCappedHeightOrWidth(width);
//
// 3) next we need to set IsHighlighter (by looking for RasterOperation.MaskPen)
//
//
// always store raster op
//
da.RasterOperation = rasterOperation;
if (rasterOperation == DrawingAttributeSerializer.RasterOperationDefaultV1)
{
//
// if rasterop is default, make sure IsHighlighter isn't in the EPC
//
if (da.ContainsPropertyData(KnownIds.IsHighlighter))
{
da.RemovePropertyData(KnownIds.IsHighlighter);
}
}
else
{
if (rasterOperation == DrawingAttributeSerializer.RasterOperationMaskPen)
{
da.IsHighlighter = true;
}
}
//else, IsHighlighter will be set to false by default, no need to set it
//
// 4) see if there is a transparency we need to add to color
//
if (transparency > DrawingAttributeSerializer.TransparencyDefaultV1)
{
//note: Color.A is set to 255 by default, which means fully opaque
//transparency is just the opposite - 0 means fully opaque so
//we need to flip the values
int alpha = MathHelper.AbsNoThrow(transparency - 255);
Color color = da.Color;
color.A = Convert.ToByte(alpha);
da.Color = color;
}
return(cbTotal);
}