Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / TextFormatting / ThousandthOfEmRealDoubles.cs / 1305600 / 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
- CharacterHit.cs
- QueryLifecycle.cs
- XmlSchemaObject.cs
- FormViewActionList.cs
- EmbeddedObject.cs
- OperatingSystem.cs
- ToolStripComboBox.cs
- StrokeDescriptor.cs
- LineMetrics.cs
- WebServiceEnumData.cs
- LogStore.cs
- BoundingRectTracker.cs
- SqlCommandSet.cs
- WindowsHyperlink.cs
- PrintSystemException.cs
- HwndAppCommandInputProvider.cs
- UITypeEditor.cs
- Set.cs
- RankException.cs
- HyperLink.cs
- DataKeyArray.cs
- TemplatedMailWebEventProvider.cs
- QueueProcessor.cs
- Queue.cs
- Timer.cs
- FormsAuthenticationModule.cs
- EventItfInfo.cs
- SchemaNamespaceManager.cs
- ColorContextHelper.cs
- EventMap.cs
- PlanCompilerUtil.cs
- WebBrowserPermission.cs
- PerformanceCounterCategory.cs
- RadioButtonPopupAdapter.cs
- CommandConverter.cs
- GiveFeedbackEventArgs.cs
- IconBitmapDecoder.cs
- ExpressionWriter.cs
- RoleManagerModule.cs
- SizeFConverter.cs
- MailBnfHelper.cs
- ImageDrawing.cs
- PageWrapper.cs
- ProcessInputEventArgs.cs
- ListenerAdaptersInstallComponent.cs
- PreviewPageInfo.cs
- IERequestCache.cs
- ViewValidator.cs
- HttpCapabilitiesEvaluator.cs
- SspiWrapper.cs
- EventLogPermissionAttribute.cs
- DoubleAnimation.cs
- ToolboxItemAttribute.cs
- DrawingGroupDrawingContext.cs
- CompressEmulationStream.cs
- TrustVersion.cs
- HtmlTable.cs
- ForEach.cs
- NumericExpr.cs
- ApplicationFileCodeDomTreeGenerator.cs
- DesignerGenericWebPart.cs
- TableAdapterManagerHelper.cs
- ApplicationFileCodeDomTreeGenerator.cs
- SendActivity.cs
- SoapCodeExporter.cs
- _ShellExpression.cs
- TrackingProfile.cs
- UnmanagedMemoryStreamWrapper.cs
- QueryStoreStatusRequest.cs
- GC.cs
- OutputWindow.cs
- ObjectIDGenerator.cs
- DataObject.cs
- MatrixAnimationBase.cs
- MissingMethodException.cs
- Point4DConverter.cs
- TokenDescriptor.cs
- ConfigurationPropertyAttribute.cs
- ResourceProviderFactory.cs
- MultidimensionalArrayItemReference.cs
- PeerNode.cs
- DataGridDesigner.cs
- ErrorRuntimeConfig.cs
- ApplicationFileParser.cs
- DiagnosticTraceSource.cs
- SafeNativeMethods.cs
- DataGridViewButtonCell.cs
- MasterPageBuildProvider.cs
- TextWriterTraceListener.cs
- LZCodec.cs
- prompt.cs
- ExpressionBuilder.cs
- XamlPoint3DCollectionSerializer.cs
- RelationshipSet.cs
- UnionExpr.cs
- StringFormat.cs
- PathParser.cs
- BufferedResponseStream.cs
- MaterialCollection.cs
- SelectorAutomationPeer.cs