//
//
/// <summary>
/// This function compares pMetricColl with the current one. If pMetricColl has more entries apart from the one
/// in the current list with which some of its entries are identical, setType is set as SUPERSET.
/// </summary>
/// <param name="metricColl"></param>
/// <param name="setType"></param>
/// <returns></returns>
public bool CompareMetricBlock( MetricBlock metricColl, ref SetType setType)
{
if( null == metricColl )
return false;
// if both have null entry, implies default metric Block for both of them
// and it already exists in the list. Return TRUE
// If only one of the blocks is empty, return FALSE - they cannot be merged
// because the other block may have customized GUID_X or GUID_Y.
if (null == GetMetricEntryList())
return (metricColl.GetMetricEntryList() == null);
if (null == metricColl.GetMetricEntryList())
return false;
// Else compare the entries
bool fTagFound = false;
uint cbLhs = this.MetricEntryCount; // No of entries in this block
uint cbRhs = metricColl.MetricEntryCount; // No of entries in the block to be compared
MetricEntry outside, inside;
if( metricColl.MetricEntryCount <= MetricEntryCount )
{
outside = metricColl.GetMetricEntryList();
inside = GetMetricEntryList();
}
else
{
inside = metricColl.GetMetricEntryList();
outside = GetMetricEntryList();
setType = SetType.SuperSet;
}
// For each entry in metricColl, search for the same in this Block.
// If it is found, continue with the next entry of smaller Block.
while( null != outside )
{
fTagFound = false;
// Always start at the begining of the larger block
MetricEntry temp = inside;
while( null != temp )
{
if( outside.Compare(temp) )
{
fTagFound = true;
break;
}
else
temp = temp.Next;
}
if( !fTagFound )
return false;
// Found the entry; Continue with the next entry in the outside block
outside = outside.Next;
}
return true;
}
/// <summary>
/// Builds the Stroke Descriptor for this stroke based on Packet Layout and Extended Properties
/// For details on how this is strored please refer to the spec.
/// </summary>
internal static void BuildStrokeDescriptor(
Stroke stroke,
GuidList guidList,
StrokeCollectionSerializer.StrokeLookupEntry strokeLookupEntry,
out StrokeDescriptor strokeDescriptor,
out MetricBlock metricBlock)
{
// Initialize the metric block for this stroke
metricBlock = new MetricBlock();
// Clear any existing template
strokeDescriptor = new StrokeDescriptor();
// Uninitialized variable passed in AddMetricEntry
MetricEntryType metricEntryType;
StylusPointDescription stylusPointDescription = stroke.StylusPoints.Description;
KnownTagCache.KnownTagIndex tag = guidList.FindTag(KnownIds.X, true);
metricEntryType = metricBlock.AddMetricEntry(stylusPointDescription.GetPropertyInfo(StylusPointProperties.X), tag);
tag = guidList.FindTag(KnownIds.Y, true);
metricEntryType = metricBlock.AddMetricEntry(stylusPointDescription.GetPropertyInfo(StylusPointProperties.Y), tag);
ReadOnlyCollection <StylusPointPropertyInfo> propertyInfos
= stylusPointDescription.GetStylusPointProperties();
int i = 0; //i is defined out of the for loop so we can use it later for buttons
for (i = 2 /*past x,y*/; i < propertyInfos.Count; i++)
{
if (i == /*StylusPointDescription.RequiredPressureIndex //修复构建的代码 */ 2 &&
!strokeLookupEntry.StorePressure)
{
//
// don't store pressure information
//
continue;
}
StylusPointPropertyInfo propertyInfo = propertyInfos[i];
if (propertyInfo.IsButton)
{
//we don't serialize buttons
break;
}
tag = guidList.FindTag(propertyInfo.Id, true);
strokeDescriptor.Template.Add(tag);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)tag);
// Create the MetricEntry for this property if necessary
metricEntryType = metricBlock.AddMetricEntry(propertyInfo, tag);
}
/*
* we drop button data on the floor.
* int buttonCount = stylusPointDescription.ButtonCount;
* // Now write the button tags in the Template
* if (buttonCount > 0)
* {
* // First write the TAG_BUTTONS
* strokeDescriptor.Template.Add(KnownTagCache.KnownTagIndex.Buttons);
* strokeDescriptor.Size += SerializationHelper.VarSize((uint)KnownTagCache.KnownTagIndex.Buttons);
*
* // Next write the i of buttons
* strokeDescriptor.Template.Add((KnownTagCache.KnownTagIndex)buttonCount);
* strokeDescriptor.Size += SerializationHelper.VarSize((uint)buttonCount);
*
* //we broke above on i when it was a button, it still
* //points to the first button
* for (; i < propertyInfos.Count; i++)
* {
* StylusPointPropertyInfo propertyInfo = propertyInfos[i];
* tag = guidList.FindTag(propertyInfo.Id, false);
*
* strokeDescriptor.Template.Add(tag);
* strokeDescriptor.Size += SerializationHelper.VarSize((uint)tag);
* }
* }
*/
// Now write the extended properties in the template
if (stroke.ExtendedProperties.Count > 0)
{
strokeDescriptor.Template.Add(KnownTagCache.KnownTagIndex.StrokePropertyList);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)KnownTagCache.KnownTagIndex.StrokePropertyList);
// Now write the tags corresponding to each extended properties of the stroke
for (int x = 0; x < stroke.ExtendedProperties.Count; x++)
{
tag = guidList.FindTag(stroke.ExtendedProperties[(int)x].Id, false);
strokeDescriptor.Template.Add(tag);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)tag);
}
}
}
/// <summary>
/// Builds StylusPointDescription based on StrokeDescriptor and Metric Descriptor Block. Sometime Metric Descriptor block may contain
/// metric information for properties which are not part of the stroke descriptor. They are simply ignored.
/// </summary>
/// <param name="strd"></param>
/// <param name="block"></param>
/// <param name="guidList"></param>
/// <returns></returns>
private StylusPointDescription BuildStylusPointDescription(StrokeDescriptor strd, MetricBlock block, GuidList guidList)
{
int cTags = 0;
int packetPropertyCount = 0;
uint buttonCount = 0;
Guid[] buttonguids = null;
System.Collections.Generic.List<KnownTagCache.KnownTagIndex> tags = null;
// if strd is null, it means there is only default descriptor with X & Y
if (null != strd)
{
tags = new System.Collections.Generic.List<KnownTagCache.KnownTagIndex>();
while (cTags < strd.Template.Count)
{
KnownTagCache.KnownTagIndex tag = (KnownTagCache.KnownTagIndex)strd.Template[cTags];
if (KnownTagCache.KnownTagIndex.Buttons == tag)
{
cTags++;
// The next item in the array is no of buttongs.
buttonCount = (uint)strd.Template[cTags];
cTags++;
// Currently we skip the the no of buttons as buttons is not implimented yet
buttonguids = new Guid[buttonCount];
for (uint u = 0; u < buttonCount; u++)
{
Guid guid = guidList.FindGuid(strd.Template[cTags]);
if (guid == Guid.Empty)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Button guid tag embedded in ISF stream does not match guid table"),"strd");
}
buttonguids[(int)u] = guid;
cTags++;
}
}
else if (KnownTagCache.KnownTagIndex.StrokePropertyList == tag)
{
break; // since no more Packet properties can be stored
}
else
{
if (KnownTagCache.KnownTagIndex.NoX == tag ||
KnownTagCache.KnownTagIndex.NoY == tag)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF with NoX or NoY specified"), "strd");
}
tags.Add(strd.Template[cTags]);
packetPropertyCount++;
cTags++;
}
}
}
List<StylusPointPropertyInfo> stylusPointPropertyInfos = new List<StylusPointPropertyInfo>();
stylusPointPropertyInfos.Add(GetStylusPointPropertyInfo(KnownIds.X, (KnownTagCache.KnownTagIndex)((uint)KnownIdCache.KnownGuidBaseIndex + (uint)KnownIdCache.OriginalISFIdIndex.X), block));
stylusPointPropertyInfos.Add(GetStylusPointPropertyInfo(KnownIds.Y, (KnownTagCache.KnownTagIndex)((uint)KnownIdCache.KnownGuidBaseIndex + (uint)KnownIdCache.OriginalISFIdIndex.Y), block));
stylusPointPropertyInfos.Add(GetStylusPointPropertyInfo(KnownIds.NormalPressure, (KnownTagCache.KnownTagIndex)((uint)KnownIdCache.KnownGuidBaseIndex + (uint)KnownIdCache.OriginalISFIdIndex.NormalPressure), block));
int pressureIndex = -1;
if (tags != null)
{
for (int i = 0; i < tags.Count; i++)
{
Guid guid = guidList.FindGuid(tags[i]);
if (guid == Guid.Empty)
{
throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Packet Description Property tag embedded in ISF stream does not match guid table"), "strd");
}
if (pressureIndex == -1 && guid == StylusPointPropertyIds.NormalPressure)
{
pressureIndex = i + 2; //x,y have already been accounted for
continue; //we've already added pressure (above)
}
stylusPointPropertyInfos.Add(GetStylusPointPropertyInfo(guid, tags[i], block));
}
if (null != buttonguids)
{
//
// add the buttons to the end of the description if they exist
//
for (int i = 0; i < buttonguids.Length; i++)
{
StylusPointProperty buttonProperty = new StylusPointProperty(buttonguids[i], true);
StylusPointPropertyInfo buttonInfo = new StylusPointPropertyInfo(buttonProperty);
stylusPointPropertyInfos.Add(buttonInfo);
}
}
}
return new StylusPointDescription(stylusPointPropertyInfos, pressureIndex);
}
/// <summary>
/// Sets the Property Metrics for a property based on Tag and metric descriptor block
/// </summary>
/// <param name="guid"></param>
/// <param name="tag"></param>
/// <param name="block"></param>
/// <returns></returns>
private StylusPointPropertyInfo GetStylusPointPropertyInfo(Guid guid, KnownTagCache.KnownTagIndex tag, MetricBlock block)
{
int dw = 0;
bool fSetDefault = false;
uint cbEntry;
// StylusPointPropertyInfo values that we need to read in.
int minimum = 0;
int maximum = 0;
StylusPointPropertyUnit unit = StylusPointPropertyUnit.None;
float resolution = 1.0f;
// To begin with initialize the property metrics with respective default valuses
// first check if this property belongs to optional list
for (dw = 0; dw < 11; dw++)
{
if (MetricEntry.MetricEntry_Optional[dw].Tag == tag)
{
minimum = MetricEntry.MetricEntry_Optional[dw].PropertyMetrics.Minimum;
maximum = MetricEntry.MetricEntry_Optional[dw].PropertyMetrics.Maximum;
resolution = MetricEntry.MetricEntry_Optional[dw].PropertyMetrics.Resolution;
unit = MetricEntry.MetricEntry_Optional[dw].PropertyMetrics.Unit;
fSetDefault = true;
break;
}
}
if (false == fSetDefault)
{
// We will come here if the property is not found in the Optional List
// All other cases, we will have only default values
minimum = Int32.MinValue;
maximum = Int32.MaxValue;
unit = StylusPointPropertyUnit.None;
resolution = 1.0f;
fSetDefault = true;
}
// Now see if there is a valid MetricBlock. If there is one, update the PROPERTY_METRICS with
// values from this Block
if (null != block)
{
MetricEntry entry = block.GetMetricEntryList();
while (null != entry)
{
if (entry.Tag == tag)
{
cbEntry = 0;
int range;
using (MemoryStream strm = new MemoryStream(entry.Data))
{
// Decoded the Logical Min
cbEntry += SerializationHelper.SignDecode(strm, out range);
if (cbEntry >= entry.Size)
{
break; // return false;
}
minimum = range;
// Logical Max
cbEntry += SerializationHelper.SignDecode(strm, out range);
if (cbEntry >= entry.Size)
{
break; // return false;
}
maximum = range;
uint cb;
// Units
cbEntry += SerializationHelper.Decode(strm, out cb);
unit = (StylusPointPropertyUnit)cb;
if (cbEntry >= entry.Size)
{
break; // return false;
}
using (BinaryReader br = new BinaryReader(strm))
{
resolution = br.ReadSingle();
cbEntry += Native.SizeOfFloat;
}
}
break;
}
entry = entry.Next;
}
}
// return a new StylusPointPropertyInfo
return new StylusPointPropertyInfo( new StylusPointProperty(guid, StylusPointPropertyIds.IsKnownButton(guid)),
minimum,
maximum,
unit,
resolution);
}
/// <summary>
/// Decodes a Metric Block from the stream. For information on how they are stored in the stream, please refer to the spec.
/// </summary>
/// <param name="strm"></param>
/// <param name="cbSize"></param>
/// <param name="block"></param>
/// <returns></returns>
private uint DecodeMetricBlock(Stream strm, uint cbSize, out MetricBlock block)
{
// allocate the block
block = new MetricBlock();
if (cbSize == 0)
return 0;
uint cb;
uint cbTotal = cbSize;
uint size;
while (cbTotal > 0)
{
// First decode the tag for this entry
uint dw;
cb = SerializationHelper.Decode(strm, out dw);
if (cb > cbTotal)
throw new ArgumentException(ISFDebugMessage("Invalid ISF data"),"strm");
cbTotal -= cb;
// Next read the size of the metric data
cb = SerializationHelper.Decode(strm, out size);
if (cb + size > cbTotal)
throw new ArgumentException(ISFDebugMessage("Invalid ISF data"),"strm");
cbTotal -= cb;
// now create new metric entry
MetricEntry entry = new MetricEntry();
entry.Tag = (KnownTagCache.KnownTagIndex)dw;
byte[] data = new byte[size];
uint bytesRead = StrokeCollectionSerializer.ReliableRead(strm, data, size);
cbTotal -= bytesRead;
if ( bytesRead != size )
{
// Make sure the bytes read are expected. If not, we should bail out.
// An exception will be thrown.
break;
}
entry.Data = data;
block.AddMetricEntry(entry);
}
if (0 != cbTotal)
throw new ArgumentException(ISFDebugMessage("Invalid ISF data"),"strm");
return cbSize;
}
/// <summary>
/// Builds the Stroke Descriptor for this stroke based on Packet Layout and Extended Properties
/// For details on how this is strored please refer to the spec.
/// </summary>
internal static void BuildStrokeDescriptor(
Stroke stroke,
GuidList guidList,
StrokeCollectionSerializer.StrokeLookupEntry strokeLookupEntry,
out StrokeDescriptor strokeDescriptor,
out MetricBlock metricBlock)
{
// Initialize the metric block for this stroke
metricBlock = new MetricBlock();
// Clear any existing template
strokeDescriptor = new StrokeDescriptor();
// Uninitialized variable passed in AddMetricEntry
MetricEntryType metricEntryType;
StylusPointDescription stylusPointDescription = stroke.StylusPoints.Description;
KnownTagCache.KnownTagIndex tag = guidList.FindTag(KnownIds.X, true);
metricEntryType = metricBlock.AddMetricEntry(stylusPointDescription.GetPropertyInfo(StylusPointProperties.X), tag);
tag = guidList.FindTag(KnownIds.Y, true);
metricEntryType = metricBlock.AddMetricEntry(stylusPointDescription.GetPropertyInfo(StylusPointProperties.Y), tag);
ReadOnlyCollection<StylusPointPropertyInfo> propertyInfos
= stylusPointDescription.GetStylusPointProperties();
int i = 0; //i is defined out of the for loop so we can use it later for buttons
for (i = 2/*past x,y*/; i < propertyInfos.Count; i++)
{
if (i == StylusPointDescription.RequiredPressureIndex/*2*/ &&
!strokeLookupEntry.StorePressure)
{
//
// don't store pressure information
//
continue;
}
StylusPointPropertyInfo propertyInfo = propertyInfos[i];
if (propertyInfo.IsButton)
{
//we don't serialize buttons
break;
}
tag = guidList.FindTag(propertyInfo.Id, true);
strokeDescriptor.Template.Add(tag);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)tag);
// Create the MetricEntry for this property if necessary
metricEntryType = metricBlock.AddMetricEntry(propertyInfo, tag);
}
/*
we drop button data on the floor. See Windows OS Bugs 1413460 for details
int buttonCount = stylusPointDescription.ButtonCount;
// Now write the button tags in the Template
if (buttonCount > 0)
{
// First write the TAG_BUTTONS
strokeDescriptor.Template.Add(KnownTagCache.KnownTagIndex.Buttons);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)KnownTagCache.KnownTagIndex.Buttons);
// Next write the i of buttons
strokeDescriptor.Template.Add((KnownTagCache.KnownTagIndex)buttonCount);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)buttonCount);
//we broke above on i when it was a button, it still
//points to the first button
for (; i < propertyInfos.Count; i++)
{
StylusPointPropertyInfo propertyInfo = propertyInfos[i];
tag = guidList.FindTag(propertyInfo.Id, false);
strokeDescriptor.Template.Add(tag);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)tag);
}
}
*/
// Now write the extended properties in the template
if (stroke.ExtendedProperties.Count > 0)
{
strokeDescriptor.Template.Add(KnownTagCache.KnownTagIndex.StrokePropertyList);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)KnownTagCache.KnownTagIndex.StrokePropertyList);
// Now write the tags corresponding to each extended properties of the stroke
for (int x = 0; x < stroke.ExtendedProperties.Count; x++)
{
tag = guidList.FindTag(stroke.ExtendedProperties[(int)x].Id, false);
strokeDescriptor.Template.Add(tag);
strokeDescriptor.Size += SerializationHelper.VarSize((uint)tag);
}
}
}
//
//
/// <summary>
/// This function compares pMetricColl with the current one. If pMetricColl has more entries apart from the one
/// in the current list with which some of its entries are identical, setType is set as SUPERSET.
/// </summary>
/// <param name="metricColl"></param>
/// <param name="setType"></param>
/// <returns></returns>
public bool CompareMetricBlock(MetricBlock metricColl, ref SetType setType)
{
if (null == metricColl)
{
return(false);
}
// if both have null entry, implies default metric Block for both of them
// and it already exists in the list. Return TRUE
// If only one of the blocks is empty, return FALSE - they cannot be merged
// because the other block may have customized GUID_X or GUID_Y.
if (null == GetMetricEntryList())
{
return(metricColl.GetMetricEntryList() == null);
}
if (null == metricColl.GetMetricEntryList())
{
return(false);
}
// Else compare the entries
bool fTagFound = false;
uint cbLhs = this.MetricEntryCount; // No of entries in this block
uint cbRhs = metricColl.MetricEntryCount; // No of entries in the block to be compared
MetricEntry outside, inside;
if (metricColl.MetricEntryCount <= MetricEntryCount)
{
outside = metricColl.GetMetricEntryList();
inside = GetMetricEntryList();
}
else
{
inside = metricColl.GetMetricEntryList();
outside = GetMetricEntryList();
setType = SetType.SuperSet;
}
// For each entry in metricColl, search for the same in this Block.
// If it is found, continue with the next entry of smaller Block.
while (null != outside)
{
fTagFound = false;
// Always start at the begining of the larger block
MetricEntry temp = inside;
while (null != temp)
{
if (outside.Compare(temp))
{
fTagFound = true;
break;
}
else
{
temp = temp.Next;
}
}
if (!fTagFound)
{
return(false);
}
// Found the entry; Continue with the next entry in the outside block
outside = outside.Next;
}
return(true);
}