Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / MS / Internal / TextFormatting / ThousandthOfEmRealDoubles.cs / 1 / ThousandthOfEmRealDoubles.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: ThousandthOfEmRealDoubles class
//
// History:
// 1/13/2005: Garyyang Created the file
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Windows;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.TextFormatting
{
///
/// This is a fixed-size implementation of IList<double>. It is aimed to reduce the double values storage
/// while providing enough precision for glyph run operations. Current usage pattern suggests that there is no
/// need to support resizing functionality (i.e. Add(), Insert(), Remove(), RemoveAt()).
///
/// For each double being stored, it will try to scale the value to 16-bit integer expressed in 1/1000th of
/// the given Em size. The scale will only be done if the precision remains no less than 1/2000th of an inch.
///
/// There are two scenarios where the given double value can not be scaled to 16-bit integer:
/// o The given Em size is so big such that 1/1000th of it is not precise enough.
/// o The given double value is so big such that the scaled value cannot be fit into a short.
///
/// If either of these cases happens (expected to happen rarely), this array implementation will fall back to store all
/// values as double.
///
internal sealed class ThousandthOfEmRealDoubles : IList
{
//----------------------------------
// Constructor
//----------------------------------
internal ThousandthOfEmRealDoubles(
double emSize,
int capacity
)
{
Debug.Assert(capacity >= 0);
_emSize = emSize;
InitArrays(capacity);
}
internal ThousandthOfEmRealDoubles(
double emSize,
IList realValues
)
{
Debug.Assert(realValues != null);
_emSize = emSize;
InitArrays(realValues.Count);
// do the setting
for (int i = 0; i < Count; i++)
{
this[i] = realValues[i];
}
}
//-------------------------------------
// Internal properties
//-------------------------------------
public int Count
{
get
{
if (_shortList != null)
{
return _shortList.Length;
}
else
{
return _doubleList.Length;
}
}
}
public bool IsReadOnly
{
get { return false; }
}
public double this[int index]
{
get
{
// Let underlying array do boundary check
if (_shortList != null)
{
return ThousandthOfEmToReal(_shortList[index]);
}
else
{
return _doubleList[index];
}
}
set
{
// Let underlying array do boundary check
if (_shortList != null)
{
short sValue;
if (RealToThousandthOfEm(value, out sValue))
{
_shortList[index] = sValue;
}
else
{
// The input double can't be scaled. We will
// fall back to use double[] now
_doubleList = new double[_shortList.Length];
for (int i = 0; i < _shortList.Length; i++)
{
_doubleList[i] = ThousandthOfEmToReal(_shortList[i]);
}
_doubleList[index] = value; // set the current value
_shortList = null; // deprecate the short array from now on
}
}
else
{
_doubleList[index] = value; // we are using double array
}
}
}
//------------------------------------
// internal methods
//------------------------------------
public int IndexOf(double item)
{
// linear search
for (int i = 0; i < Count; i++)
{
if (this[i] == item)
{
return i;
}
}
return -1;
}
public void Clear()
{
// zero the stored values
if (_shortList != null)
{
for (int i = 0; i < _shortList.Length; i++)
{
_shortList[i] = 0;
}
}
else
{
for (int i = 0; i < _doubleList.Length; i++)
{
_doubleList[i] = 0;
}
}
}
public bool Contains(double item)
{
return IndexOf(item) >= 0;
}
public void CopyTo(double[] array, int arrayIndex)
{
// parameter validations
if (array == null)
{
throw new ArgumentNullException("array");
}
if (array.Rank != 1)
{
throw new ArgumentException(
SR.Get(SRID.Collection_CopyTo_ArrayCannotBeMultidimensional),
"array");
}
if (arrayIndex < 0)
{
throw new ArgumentOutOfRangeException("arrayIndex");
}
if (arrayIndex >= array.Length)
{
throw new ArgumentException(
SR.Get(
SRID.Collection_CopyTo_IndexGreaterThanOrEqualToArrayLength,
"arrayIndex",
"array"),
"arrayIndex");
}
if ((array.Length - Count - arrayIndex) < 0)
{
throw new ArgumentException(
SR.Get(
SRID.Collection_CopyTo_NumberOfElementsExceedsArrayLength,
"arrayIndex",
"array"));
}
// do the copying here
for (int i = 0; i < Count; i++)
{
array[arrayIndex + i] = this[i];
}
}
public IEnumerator GetEnumerator()
{
for (int i = 0; i < Count; i++)
{
yield return this[i];
}
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return ((IEnumerable)this).GetEnumerator();
}
public void Add(double value)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
public void Insert(int index, double item)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
public bool Remove(double item)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
public void RemoveAt(int index)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
//---------------------------------------------
// Private methods
//---------------------------------------------
private void InitArrays(int capacity)
{
if (_emSize > CutOffEmSize)
{
// use double storage when emsize is too big
_doubleList = new double[capacity];
}
else
{
// store value as scaled short.
_shortList = new short[capacity];
}
}
private bool RealToThousandthOfEm(double value, out short thousandthOfEm)
{
double scaled = (value / _emSize) * ToThousandthOfEm;
if (scaled > short.MaxValue || scaled < short.MinValue)
{
// value too big to fit into a short
thousandthOfEm = 0;
return false;
}
else
{
// round to nearest short
thousandthOfEm = (short) Math.Round(scaled);
return true;
}
}
private double ThousandthOfEmToReal(short thousandthOfEm)
{
return ((double)thousandthOfEm) * ToReal * _emSize;
}
//----------------------------------------
// Private members
//----------------------------------------
private short[] _shortList; // scaled short values
private double[] _doubleList; // fall-back double list, is null for most cases
private double _emSize; // em size to scaled with
// Default scaling is 1/1000 emsize.
private const double ToThousandthOfEm = 1000.0;
private const double ToReal = 1.0 / ToThousandthOfEm;
// To achieve precsion of no less than 1/2000 of an inch, font Em size must be no greater than 48.
// i.e. 48px is 1/2 inch. 1000th of Em size at 48px is 1/2000 inch.
private const double CutOffEmSize = 48;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
//
// Description: ThousandthOfEmRealDoubles class
//
// History:
// 1/13/2005: Garyyang Created the file
//
//---------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Windows;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
namespace MS.Internal.TextFormatting
{
///
/// This is a fixed-size implementation of IList<double>. It is aimed to reduce the double values storage
/// while providing enough precision for glyph run operations. Current usage pattern suggests that there is no
/// need to support resizing functionality (i.e. Add(), Insert(), Remove(), RemoveAt()).
///
/// For each double being stored, it will try to scale the value to 16-bit integer expressed in 1/1000th of
/// the given Em size. The scale will only be done if the precision remains no less than 1/2000th of an inch.
///
/// There are two scenarios where the given double value can not be scaled to 16-bit integer:
/// o The given Em size is so big such that 1/1000th of it is not precise enough.
/// o The given double value is so big such that the scaled value cannot be fit into a short.
///
/// If either of these cases happens (expected to happen rarely), this array implementation will fall back to store all
/// values as double.
///
internal sealed class ThousandthOfEmRealDoubles : IList
{
//----------------------------------
// Constructor
//----------------------------------
internal ThousandthOfEmRealDoubles(
double emSize,
int capacity
)
{
Debug.Assert(capacity >= 0);
_emSize = emSize;
InitArrays(capacity);
}
internal ThousandthOfEmRealDoubles(
double emSize,
IList realValues
)
{
Debug.Assert(realValues != null);
_emSize = emSize;
InitArrays(realValues.Count);
// do the setting
for (int i = 0; i < Count; i++)
{
this[i] = realValues[i];
}
}
//-------------------------------------
// Internal properties
//-------------------------------------
public int Count
{
get
{
if (_shortList != null)
{
return _shortList.Length;
}
else
{
return _doubleList.Length;
}
}
}
public bool IsReadOnly
{
get { return false; }
}
public double this[int index]
{
get
{
// Let underlying array do boundary check
if (_shortList != null)
{
return ThousandthOfEmToReal(_shortList[index]);
}
else
{
return _doubleList[index];
}
}
set
{
// Let underlying array do boundary check
if (_shortList != null)
{
short sValue;
if (RealToThousandthOfEm(value, out sValue))
{
_shortList[index] = sValue;
}
else
{
// The input double can't be scaled. We will
// fall back to use double[] now
_doubleList = new double[_shortList.Length];
for (int i = 0; i < _shortList.Length; i++)
{
_doubleList[i] = ThousandthOfEmToReal(_shortList[i]);
}
_doubleList[index] = value; // set the current value
_shortList = null; // deprecate the short array from now on
}
}
else
{
_doubleList[index] = value; // we are using double array
}
}
}
//------------------------------------
// internal methods
//------------------------------------
public int IndexOf(double item)
{
// linear search
for (int i = 0; i < Count; i++)
{
if (this[i] == item)
{
return i;
}
}
return -1;
}
public void Clear()
{
// zero the stored values
if (_shortList != null)
{
for (int i = 0; i < _shortList.Length; i++)
{
_shortList[i] = 0;
}
}
else
{
for (int i = 0; i < _doubleList.Length; i++)
{
_doubleList[i] = 0;
}
}
}
public bool Contains(double item)
{
return IndexOf(item) >= 0;
}
public void CopyTo(double[] array, int arrayIndex)
{
// parameter validations
if (array == null)
{
throw new ArgumentNullException("array");
}
if (array.Rank != 1)
{
throw new ArgumentException(
SR.Get(SRID.Collection_CopyTo_ArrayCannotBeMultidimensional),
"array");
}
if (arrayIndex < 0)
{
throw new ArgumentOutOfRangeException("arrayIndex");
}
if (arrayIndex >= array.Length)
{
throw new ArgumentException(
SR.Get(
SRID.Collection_CopyTo_IndexGreaterThanOrEqualToArrayLength,
"arrayIndex",
"array"),
"arrayIndex");
}
if ((array.Length - Count - arrayIndex) < 0)
{
throw new ArgumentException(
SR.Get(
SRID.Collection_CopyTo_NumberOfElementsExceedsArrayLength,
"arrayIndex",
"array"));
}
// do the copying here
for (int i = 0; i < Count; i++)
{
array[arrayIndex + i] = this[i];
}
}
public IEnumerator GetEnumerator()
{
for (int i = 0; i < Count; i++)
{
yield return this[i];
}
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return ((IEnumerable)this).GetEnumerator();
}
public void Add(double value)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
public void Insert(int index, double item)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
public bool Remove(double item)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
public void RemoveAt(int index)
{
// not supported, same as double[]
throw new NotSupportedException(SR.Get(SRID.CollectionIsFixedSize));
}
//---------------------------------------------
// Private methods
//---------------------------------------------
private void InitArrays(int capacity)
{
if (_emSize > CutOffEmSize)
{
// use double storage when emsize is too big
_doubleList = new double[capacity];
}
else
{
// store value as scaled short.
_shortList = new short[capacity];
}
}
private bool RealToThousandthOfEm(double value, out short thousandthOfEm)
{
double scaled = (value / _emSize) * ToThousandthOfEm;
if (scaled > short.MaxValue || scaled < short.MinValue)
{
// value too big to fit into a short
thousandthOfEm = 0;
return false;
}
else
{
// round to nearest short
thousandthOfEm = (short) Math.Round(scaled);
return true;
}
}
private double ThousandthOfEmToReal(short thousandthOfEm)
{
return ((double)thousandthOfEm) * ToReal * _emSize;
}
//----------------------------------------
// Private members
//----------------------------------------
private short[] _shortList; // scaled short values
private double[] _doubleList; // fall-back double list, is null for most cases
private double _emSize; // em size to scaled with
// Default scaling is 1/1000 emsize.
private const double ToThousandthOfEm = 1000.0;
private const double ToReal = 1.0 / ToThousandthOfEm;
// To achieve precsion of no less than 1/2000 of an inch, font Em size must be no greater than 48.
// i.e. 48px is 1/2 inch. 1000th of Em size at 48px is 1/2000 inch.
private const double CutOffEmSize = 48;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- FileDialog.cs
- CodeTypeDelegate.cs
- Automation.cs
- GrammarBuilderPhrase.cs
- SHA512Managed.cs
- UpdateCompiler.cs
- SRDisplayNameAttribute.cs
- SettingsAttributeDictionary.cs
- TraceSource.cs
- Command.cs
- XmlCustomFormatter.cs
- storepermissionattribute.cs
- TextEditorSpelling.cs
- DataFieldCollectionEditor.cs
- ProvideValueServiceProvider.cs
- ToolBarTray.cs
- TraceListeners.cs
- Attachment.cs
- UnauthorizedWebPart.cs
- VectorCollectionValueSerializer.cs
- ReliableSessionElement.cs
- WaitHandleCannotBeOpenedException.cs
- ReferencedType.cs
- MissingFieldException.cs
- AssemblyHash.cs
- SHA512.cs
- HyperlinkAutomationPeer.cs
- StateDesigner.CommentLayoutGlyph.cs
- SQLBoolean.cs
- OneOfElement.cs
- RewritingSimplifier.cs
- ObjectDisposedException.cs
- ItemCollection.cs
- CodeFieldReferenceExpression.cs
- CurrencyManager.cs
- CancellationState.cs
- CaseInsensitiveOrdinalStringComparer.cs
- ConfigurationLocation.cs
- Tuple.cs
- StreamGeometry.cs
- SignerInfo.cs
- WebServiceHost.cs
- InputScopeConverter.cs
- sqlmetadatafactory.cs
- Cursor.cs
- XmlSchema.cs
- QilLoop.cs
- RectConverter.cs
- Point3DValueSerializer.cs
- ClipboardData.cs
- ButtonChrome.cs
- SqlProviderManifest.cs
- SymLanguageType.cs
- BeginStoryboard.cs
- XPathScanner.cs
- DataGridViewColumnEventArgs.cs
- HashSet.cs
- SQLDouble.cs
- SemanticBasicElement.cs
- EntityTypeEmitter.cs
- DesignTimeParseData.cs
- RoleManagerModule.cs
- MessageQueue.cs
- EntityDataReader.cs
- GridViewCancelEditEventArgs.cs
- TypeTypeConverter.cs
- CatalogPartChrome.cs
- EntityContainerEntitySet.cs
- MeshGeometry3D.cs
- ImageCreator.cs
- SessionSymmetricMessageSecurityProtocolFactory.cs
- DataGridViewAutoSizeColumnModeEventArgs.cs
- AutomationProperties.cs
- HostingPreferredMapPath.cs
- _SecureChannel.cs
- BindingElementExtensionElement.cs
- FieldNameLookup.cs
- OutKeywords.cs
- PriorityBinding.cs
- FastEncoderWindow.cs
- ColorConverter.cs
- input.cs
- AdRotator.cs
- XmlDocumentSchema.cs
- SecurityState.cs
- InternalTransaction.cs
- DataGridViewAccessibleObject.cs
- DefaultTextStoreTextComposition.cs
- Transform3DGroup.cs
- DbProviderFactory.cs
- ElementsClipboardData.cs
- StringArrayConverter.cs
- SpecialNameAttribute.cs
- MessageAction.cs
- AuthorizationRuleCollection.cs
- PageEventArgs.cs
- EventsTab.cs
- Light.cs
- ContractHandle.cs
- CodeThrowExceptionStatement.cs