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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
//
// Description: Implementation of the class Geometry
//
//
using MS.Internal;
using MS.Win32.PresentationCore;
using System.ComponentModel;
using System.Windows.Media.Composition;
using System.Windows.Media.Animation;
using System.Runtime.InteropServices;
namespace System.Windows.Media
{
#region Geometry
/// <summary>
/// This is the base class for all Geometry classes. A geometry has bounds,
/// can be used to clip, fill or stroke.
/// </summary>
[Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)]
public abstract partial class Geometry : Animatable, DUCE.IResource
{
#region Constructors
internal Geometry()
{
}
#endregion
#region Public properties
/// <summary>
/// Singleton empty model.
/// </summary>
public static Geometry Empty
{
get
{
return s_empty;
}
}
/// <summary>
/// Gets the bounds of this Geometry as an axis-aligned bounding box
/// </summary>
public virtual Rect Bounds
{
get
{
return PathGeometry.GetPathBounds(
GetPathGeometryData(),
null, // pen
Matrix.Identity,
StandardFlatteningTolerance,
ToleranceType.Absolute,
false); // Do not skip non-fillable figures
}
}
/// <summary>
/// Standard error tolerance (0.25) used for polygonal approximation of curved segments
/// </summary>
public static double StandardFlatteningTolerance
{
get
{
return c_tolerance;
}
}
#endregion Public properties
#region GetRenderBounds
/// <summary>
/// Returns the axis-aligned bounding rectangle when stroked with a pen.
/// </summary>
/// <param name="pen">The pen</param>
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
public virtual Rect GetRenderBounds(Pen pen, double tolerance, ToleranceType type)
{
ReadPreamble();
Matrix matrix = Matrix.Identity;
return GetBoundsInternal(pen, matrix, tolerance, type);
}
/// <summary>
/// Returns the axis-aligned bounding rectangle when stroked with a pen.
/// </summary>
/// <param name="pen">The pen</param>
public Rect GetRenderBounds(Pen pen)
{
ReadPreamble();
Matrix matrix = Matrix.Identity;
return GetBoundsInternal(pen, matrix, StandardFlatteningTolerance, ToleranceType.Absolute);
}
#endregion GetRenderBounds
#region Internal Methods
/// <summary>
/// Used to optimize Visual.ChangeVisualClip. This is not meant
/// to be used generically since not all geometries implement
/// the method (currently only RectangleGeometry is implemented).
/// </summary>
internal virtual bool AreClose(Geometry geometry)
{
return false;
}
/// <summary>
/// Returns the axis-aligned bounding rectangle when stroked with a pen, after applying
/// the supplied transform (if non-null).
/// </summary>
internal virtual Rect GetBoundsInternal(Pen pen, Matrix matrix, double tolerance, ToleranceType type)
{
if (IsObviouslyEmpty())
{
return Rect.Empty;
}
PathGeometryData pathData = GetPathGeometryData();
return PathGeometry.GetPathBounds(
pathData,
pen,
matrix,
tolerance,
type,
true); /* skip hollows */
}
/// <summary>
/// Returns the axis-aligned bounding rectangle when stroked with a pen, after applying
/// the supplied transform (if non-null).
/// </summary>
internal Rect GetBoundsInternal(Pen pen, Matrix matrix)
{
return GetBoundsInternal(pen, matrix, StandardFlatteningTolerance, ToleranceType.Absolute);
}
internal unsafe static Rect GetBoundsHelper(
Pen pen,
Matrix *pWorldMatrix,
Point* pPoints,
byte *pTypes,
uint pointCount,
uint segmentCount,
Matrix *pGeometryMatrix,
double tolerance,
ToleranceType type,
bool fSkipHollows)
{
MIL_PEN_DATA penData;
double[] dashArray = null;
// If the pen contributes to the bounds, populate the CMD struct
bool fPenContributesToBounds = Pen.ContributesToBounds(pen);
if (fPenContributesToBounds)
{
pen.GetBasicPenData(&penData, out dashArray);
}
MilMatrix3x2D geometryMatrix;
if (pGeometryMatrix != null)
{
geometryMatrix = CompositionResourceManager.MatrixToMilMatrix3x2D(ref (*pGeometryMatrix));
}
Debug.Assert(pWorldMatrix != null);
MilMatrix3x2D worldMatrix =
CompositionResourceManager.MatrixToMilMatrix3x2D(ref (*pWorldMatrix));
Rect bounds;
fixed (double *pDashArray = dashArray)
{
int hr = MilCoreApi.MilUtility_PolygonBounds(
&worldMatrix,
(fPenContributesToBounds) ? &penData : null,
(dashArray == null) ? null : pDashArray,
pPoints,
pTypes,
pointCount,
segmentCount,
(pGeometryMatrix == null) ? null : &geometryMatrix,
tolerance,
type == ToleranceType.Relative,
fSkipHollows,
&bounds
);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we report that the geometry has empty bounds.
bounds = Rect.Empty;
}
else
{
HRESULT.Check(hr);
}
}
return bounds;
}
internal virtual void TransformPropertyChangedHook(DependencyPropertyChangedEventArgs e)
{
// Do nothing here -- Overriden by PathGeometry to clear cached bounds.
}
internal Geometry GetTransformedCopy(Transform transform)
{
Geometry copy = Clone();
Transform internalTransform = Transform;
if (transform != null && !transform.IsIdentity)
{
if (internalTransform == null || internalTransform.IsIdentity)
{
copy.Transform = transform;
}
else
{
copy.Transform = new MatrixTransform(internalTransform.Value * transform.Value);
}
}
return copy;
}
#endregion Internal Methods
/// <summary>
/// ShouldSerializeTransform - this is called by the serializer to determine whether or not to
/// serialize the Transform property.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public bool ShouldSerializeTransform()
{
Transform transform = Transform;
return transform != null && !(transform.IsIdentity);
}
#region Public Methods
/// <summary>
/// Gets the area of this geometry
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
/// </summary>
public virtual double GetArea(double tolerance, ToleranceType type)
{
ReadPreamble();
if (IsObviouslyEmpty())
{
return 0;
}
PathGeometryData pathData = GetPathGeometryData();
if (pathData.IsEmpty())
{
return 0;
}
double area;
unsafe
{
// Call the core method on the path data
fixed (byte* pbPathData = pathData.SerializedData)
{
Debug.Assert(pbPathData != (byte*)0);
int hr = MilCoreApi.MilUtility_GeometryGetArea(
pathData.FillRule,
pbPathData,
pathData.Size,
&pathData.Matrix,
tolerance,
type == ToleranceType.Relative,
&area);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we report that the geometry has 0 area.
area = 0.0;
}
else
{
HRESULT.Check(hr);
}
}
}
return area;
}
/// <summary>
/// Gets the area of this geometry
/// </summary>
public double GetArea()
{
return GetArea(StandardFlatteningTolerance, ToleranceType.Absolute);
}
/// <summary>
/// Returns true if this geometry is empty
/// </summary>
public abstract bool IsEmpty();
/// <summary>
/// Returns true if this geometry may have curved segments
/// </summary>
public abstract bool MayHaveCurves();
#endregion Public Methods
#region Hit Testing
/// <summary>
/// Returns true if point is inside the fill region defined by this geometry.
/// </summary>
/// <param name="hitPoint">The point tested for containment</param>
/// <param name="tolerance">Acceptable margin of error in distance computation</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
public bool FillContains(Point hitPoint, double tolerance, ToleranceType type)
{
return ContainsInternal(null, hitPoint, tolerance, type);
}
/// <summary>
/// Returns true if point is inside the fill region defined by this geometry.
/// </summary>
/// <param name="hitPoint">The point tested for containment</param>
public bool FillContains(Point hitPoint)
{
return ContainsInternal(null, hitPoint, StandardFlatteningTolerance, ToleranceType.Absolute);
}
/// <summary>
/// Returns true if point is inside the stroke of a pen on this geometry.
/// </summary>
/// <param name="pen">The pen used to define the stroke</param>
/// <param name="hitPoint">The point tested for containment</param>
/// <param name="tolerance">Acceptable margin of error in distance computation</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
public bool StrokeContains(Pen pen, Point hitPoint, double tolerance, ToleranceType type)
{
if (pen == null)
{
return false;
}
return ContainsInternal(pen, hitPoint, tolerance, type);
}
/// <summary>
/// Returns true if point is inside the stroke of a pen on this geometry.
/// </summary>
/// <param name="pen">The pen used to define the stroke</param>
/// <param name="hitPoint">The point tested for containment</param>
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
internal virtual bool ContainsInternal(Pen pen, Point hitPoint, double tolerance, ToleranceType type)
{
if (IsObviouslyEmpty())
{
return false;
}
PathGeometryData pathData = GetPathGeometryData();
if (pathData.IsEmpty())
{
return false;
}
bool contains = false;
unsafe
{
MIL_PEN_DATA penData;
double[] dashArray = null;
// If we have a pen, populate the CMD struct
if (pen != null)
{
pen.GetBasicPenData(&penData, out dashArray);
}
fixed (byte* pbPathData = pathData.SerializedData)
{
Debug.Assert(pbPathData != (byte*)0);
fixed (double * dashArrayFixed = dashArray)
{
int hr = MilCoreApi.MilUtility_PathGeometryHitTest(
&pathData.Matrix,
(pen == null) ? null : &penData,
dashArrayFixed,
pathData.FillRule,
pbPathData,
pathData.Size,
tolerance,
type == ToleranceType.Relative,
&hitPoint,
out contains);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we report that the geometry is never hittable.
contains = false;
}
else
{
HRESULT.Check(hr);
}
}
}
}
return contains;
}
/// <summary>
/// Helper method to be used by derived implementations of ContainsInternal.
/// </summary>
internal unsafe bool ContainsInternal(Pen pen, Point hitPoint, double tolerance, ToleranceType type,
Point *pPoints, uint pointCount, byte *pTypes, uint typeCount)
{
bool contains = false;
MilMatrix3x2D matrix = CompositionResourceManager.TransformToMilMatrix3x2D(Transform);
MIL_PEN_DATA penData;
double[] dashArray = null;
if (pen != null)
{
pen.GetBasicPenData(&penData, out dashArray);
}
fixed (double *dashArrayFixed = dashArray)
{
int hr = MilCoreApi.MilUtility_PolygonHitTest(
&matrix,
(pen == null) ? null : &penData,
dashArrayFixed,
pPoints,
pTypes,
pointCount,
typeCount,
tolerance,
type == ToleranceType.Relative,
&hitPoint,
out contains);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we report that the geometry is never hittable.
contains = false;
}
else
{
HRESULT.Check(hr);
}
}
return contains;
}
/// <summary>
/// Returns true if point is inside the stroke of a pen on this geometry.
/// </summary>
/// <param name="pen">The pen used to define the stroke</param>
/// <param name="hitPoint">The point tested for containment</param>
public bool StrokeContains(Pen pen, Point hitPoint)
{
return StrokeContains(pen, hitPoint, StandardFlatteningTolerance, ToleranceType.Absolute);
}
/// <summary>
/// Returns true if a given geometry is contained inside this geometry.
/// </summary>
/// <param name="geometry">The geometry tested for containment</param>
/// <param name="tolerance">Acceptable margin of error in distance computation</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
public bool FillContains(Geometry geometry, double tolerance, ToleranceType type)
{
IntersectionDetail detail = FillContainsWithDetail(geometry, tolerance, type);
return (detail == IntersectionDetail.FullyContains);
}
/// <summary>
/// Returns true if a given geometry is contained inside this geometry.
/// </summary>
/// <param name="geometry">The geometry tested for containment</param>
public bool FillContains(Geometry geometry)
{
return FillContains(geometry, StandardFlatteningTolerance, ToleranceType.Absolute);
}
/// <summary>
/// Returns true if a given geometry is inside this geometry.
/// <param name="geometry">The geometry to test for containment in this Geometry</param>
/// <param name="tolerance">Acceptable margin of error in distance computation</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
/// </summary>
public virtual IntersectionDetail FillContainsWithDetail(Geometry geometry, double tolerance, ToleranceType type)
{
ReadPreamble();
if (IsObviouslyEmpty() || geometry == null || geometry.IsObviouslyEmpty())
{
return IntersectionDetail.Empty;
}
return PathGeometry.HitTestWithPathGeometry(this, geometry, tolerance, type);
}
/// <summary>
/// Returns if geometry is inside this geometry.
/// <param name="geometry">The geometry to test for containment in this Geometry</param>
/// </summary>
public IntersectionDetail FillContainsWithDetail(Geometry geometry)
{
return FillContainsWithDetail(geometry, StandardFlatteningTolerance, ToleranceType.Absolute);
}
/// <summary>
/// Returns if a given geometry is inside the stroke defined by a given pen on this geometry.
/// <param name="pen">The pen</param>
/// <param name="geometry">The geometry to test for containment in this Geometry</param>
/// <param name="tolerance">Acceptable margin of error in distance computation</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
/// </summary>
public IntersectionDetail StrokeContainsWithDetail(Pen pen, Geometry geometry, double tolerance, ToleranceType type)
{
if (IsObviouslyEmpty() || geometry == null || geometry.IsObviouslyEmpty() || pen == null)
{
return IntersectionDetail.Empty;
}
PathGeometry pathGeometry1 = GetWidenedPathGeometry(pen);
return PathGeometry.HitTestWithPathGeometry(pathGeometry1, geometry, tolerance, type);
}
/// <summary>
/// Returns if a given geometry is inside the stroke defined by a given pen on this geometry.
/// <param name="pen">The pen</param>
/// <param name="geometry">The geometry to test for containment in this Geometry</param>
/// </summary>
public IntersectionDetail StrokeContainsWithDetail(Pen pen, Geometry geometry)
{
return StrokeContainsWithDetail(pen, geometry, StandardFlatteningTolerance, ToleranceType.Absolute);
}
#endregion
#region Geometric Flatten
/// <summary>
/// Approximate this geometry with a polygonal PathGeometry
/// </summary>
/// <param name="tolerance">The approximation error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
/// <returns>Returns the polygonal approximation as a PathGeometry.</returns>
public virtual PathGeometry GetFlattenedPathGeometry(double tolerance, ToleranceType type)
{
ReadPreamble();
if (IsObviouslyEmpty())
{
return new PathGeometry();
}
PathGeometryData pathData = GetPathGeometryData();
if (pathData.IsEmpty())
{
return new PathGeometry();
}
PathGeometry resultGeometry = null;
unsafe
{
fixed (byte *pbPathData = pathData.SerializedData)
{
Debug.Assert(pbPathData != (byte*)0);
FillRule fillRule = FillRule.Nonzero;
PathGeometry.FigureList list = new PathGeometry.FigureList();
int hr = UnsafeNativeMethods.MilCoreApi.MilUtility_PathGeometryFlatten(
&pathData.Matrix,
pathData.FillRule,
pbPathData,
pathData.Size,
tolerance,
type == ToleranceType.Relative,
new PathGeometry.AddFigureToListDelegate(list.AddFigureToList),
out fillRule);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we return an empty geometry.
resultGeometry = new PathGeometry();
}
else
{
HRESULT.Check(hr);
resultGeometry = new PathGeometry(list.Figures, fillRule, null);
}
}
return resultGeometry;
}
}
/// <summary>
/// Approximate this geometry with a polygonal PathGeometry
/// </summary>
/// <returns>Returns the polygonal approximation as a PathGeometry.</returns>
public PathGeometry GetFlattenedPathGeometry()
{
// Use the default tolerance interpreted as absolute
return GetFlattenedPathGeometry(StandardFlatteningTolerance, ToleranceType.Absolute);
}
#endregion Flatten
#region Geometric Widen
/// <summary>
/// Create the contour of the stroke defined by given pen when it draws this path
/// </summary>
/// <param name="pen">The pen used for stroking this path</param>
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
/// <returns>Returns the contour as a PathGeometry.</returns>
public virtual PathGeometry GetWidenedPathGeometry(Pen pen, double tolerance, ToleranceType type)
{
ReadPreamble();
ArgumentNullException.ThrowIfNull(pen);
if (IsObviouslyEmpty())
{
return new PathGeometry();
}
PathGeometryData pathData = GetPathGeometryData();
if (pathData.IsEmpty())
{
return new PathGeometry();
}
PathGeometry resultGeometry = null;
unsafe
{
MIL_PEN_DATA penData;
double[] dashArray = null;
pen.GetBasicPenData(&penData, out dashArray);
fixed (byte *pbPathData = pathData.SerializedData)
{
Debug.Assert(pbPathData != (byte*)0);
FillRule fillRule = FillRule.Nonzero;
PathGeometry.FigureList list = new PathGeometry.FigureList();
// The handle to the pDashArray, if we have one.
// Since the dash array is optional, we may not need to Free it.
GCHandle handle = new GCHandle();
// Pin the pDashArray, if we have one.
if (dashArray != null)
{
handle = GCHandle.Alloc(dashArray, GCHandleType.Pinned);
}
try
{
int hr = UnsafeNativeMethods.MilCoreApi.MilUtility_PathGeometryWiden(
&penData,
(dashArray == null) ? null : (double*)handle.AddrOfPinnedObject(),
&pathData.Matrix,
pathData.FillRule,
pbPathData,
pathData.Size,
tolerance,
type == ToleranceType.Relative,
new PathGeometry.AddFigureToListDelegate(list.AddFigureToList),
out fillRule);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we return an empty geometry.
resultGeometry = new PathGeometry();
}
else
{
HRESULT.Check(hr);
resultGeometry = new PathGeometry(list.Figures, fillRule, null);
}
}
finally
{
if (handle.IsAllocated)
{
handle.Free();
}
}
}
return resultGeometry;
}
}
/// <summary>
/// Create the contour of the stroke defined by given pen when it draws this path
/// </summary>
/// <param name="pen">The pen used for stroking this path</param>
/// <returns>Returns the contour as a PathGeometry.</returns>
public PathGeometry GetWidenedPathGeometry(Pen pen)
{
// Use the default tolerance interpreted as absolute
return GetWidenedPathGeometry(pen, StandardFlatteningTolerance, ToleranceType.Absolute);
}
#endregion Widen
#region Combine
/// <summary>
/// Returns the result of a Boolean combination of two Geometry objects.
/// </summary>
/// <param name="geometry1">The first Geometry object</param>
/// <param name="geometry2">The second Geometry object</param>
/// <param name="mode">The mode in which the objects will be combined</param>
/// <param name="transform">A transformation to apply to the result, or null</param>
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
public static PathGeometry Combine(
Geometry geometry1,
Geometry geometry2,
GeometryCombineMode mode,
Transform transform,
double tolerance,
ToleranceType type)
{
return PathGeometry.InternalCombine(geometry1, geometry2, mode, transform, tolerance, type);
}
/// <summary>
/// Returns the result of a Boolean combination of two Geometry objects.
/// </summary>
/// <param name="geometry1">The first Geometry object</param>
/// <param name="geometry2">The second Geometry object</param>
/// <param name="mode">The mode in which the objects will be combined</param>
/// <param name="transform">A transformation to apply to the result, or null</param>
public static PathGeometry Combine(
Geometry geometry1,
Geometry geometry2,
GeometryCombineMode mode,
Transform transform)
{
return PathGeometry.InternalCombine(
geometry1,
geometry2,
mode,
transform,
Geometry.StandardFlatteningTolerance,
ToleranceType.Absolute);
}
#endregion Combine
#region Outline
/// <summary>
/// Get a simplified contour of the filled region of this PathGeometry
/// </summary>
/// <param name="tolerance">The computational error tolerance</param>
/// <param name="type">The way the error tolerance will be interpreted - relative or absolute</param>
/// <returns>Returns an equivalent geometry, properly oriented with no self-intersections.</returns>
public virtual PathGeometry GetOutlinedPathGeometry(double tolerance, ToleranceType type)
{
ReadPreamble();
if (IsObviouslyEmpty())
{
return new PathGeometry();
}
PathGeometryData pathData = GetPathGeometryData();
if (pathData.IsEmpty())
{
return new PathGeometry();
}
PathGeometry resultGeometry = null;
unsafe
{
fixed (byte* pbPathData = pathData.SerializedData)
{
Invariant.Assert(pbPathData != (byte*)0);
FillRule fillRule = FillRule.Nonzero;
PathGeometry.FigureList list = new PathGeometry.FigureList();
int hr = UnsafeNativeMethods.MilCoreApi.MilUtility_PathGeometryOutline(
&pathData.Matrix,
pathData.FillRule,
pbPathData,
pathData.Size,
tolerance,
type == ToleranceType.Relative,
new PathGeometry.AddFigureToListDelegate(list.AddFigureToList),
out fillRule);
if (hr == (int)MILErrors.WGXERR_BADNUMBER)
{
// When we encounter NaNs in the renderer, we absorb the error and draw
// nothing. To be consistent, we return an empty geometry.
resultGeometry = new PathGeometry();
}
else
{
HRESULT.Check(hr);
resultGeometry = new PathGeometry(list.Figures, fillRule, null);
}
}
}
return resultGeometry;
}
/// <summary>
/// Get a simplified contour of the filled region of this PathGeometry
/// </summary>
/// <returns>Returns an equivalent geometry, properly oriented with no self-intersections.</returns>
public PathGeometry GetOutlinedPathGeometry()
{
return GetOutlinedPathGeometry(StandardFlatteningTolerance, ToleranceType.Absolute);
}
#endregion Outline
#region Internal
internal abstract PathGeometry GetAsPathGeometry();
/// <summary>
/// GetPathGeometryData - returns a struct which contains this Geometry represented
/// as a path geometry's serialized format.
/// </summary>
internal abstract PathGeometryData GetPathGeometryData();
internal PathFigureCollection GetPathFigureCollection()
{
return GetTransformedFigureCollection(null);
}
// Get the combination of the internal transform with a given transform.
// Return true if the result is nontrivial.
internal Matrix GetCombinedMatrix(Transform transform)
{
Matrix matrix = Matrix.Identity;
Transform internalTransform = Transform;
if (internalTransform != null && !internalTransform.IsIdentity)
{
matrix = internalTransform.Value;
if (transform != null && !transform.IsIdentity)
{
matrix *= transform.Value;
}
}
else if (transform != null && !transform.IsIdentity)
{
matrix = transform.Value;
}
return matrix;
}
internal abstract PathFigureCollection GetTransformedFigureCollection(Transform transform);
// This method is used for eliminating unnecessary work when the geometry is obviously empty.
// For most Geometry types the definite IsEmpty() query is just as cheap. The exceptions will
// be CombinedGeometry and GeometryGroup.
internal virtual bool IsObviouslyEmpty() { return IsEmpty(); }
/// <summary>
/// Can serialize "this" to a string
/// </summary>
internal virtual bool CanSerializeToString()
{
return false;
}
internal struct PathGeometryData
{
internal bool IsEmpty()
{
if ((SerializedData == null) || (SerializedData.Length <= 0))
{
return true;
}
unsafe
{
fixed (byte *pbPathData = SerializedData)
{
MIL_PATHGEOMETRY* pPathGeometry = (MIL_PATHGEOMETRY*)pbPathData;
return pPathGeometry->FigureCount <= 0;
}
}
}
internal FillRule FillRule;
internal MilMatrix3x2D Matrix;
internal byte[] SerializedData;
internal uint Size
{
get
{
if ((SerializedData == null) || (SerializedData.Length <= 0))
{
return 0;
}
unsafe
{
fixed (byte *pbPathData = SerializedData)
{
MIL_PATHGEOMETRY* pPathGeometryData = (MIL_PATHGEOMETRY*)pbPathData;
uint size = pPathGeometryData == null ? 0 : pPathGeometryData->Size;
Invariant.Assert(size <= (uint)SerializedData.Length);
return size;
}
}
}
}
}
internal static PathGeometryData GetEmptyPathGeometryData()
{
return s_emptyPathGeometryData;
}
#endregion Internal
#region Private
private static PathGeometryData MakeEmptyPathGeometryData()
{
PathGeometryData data = new PathGeometryData();
data.FillRule = FillRule.EvenOdd;
data.Matrix = CompositionResourceManager.MatrixToMilMatrix3x2D(Matrix.Identity);
unsafe
{
int size = sizeof(MIL_PATHGEOMETRY);
data.SerializedData = new byte[size];
fixed (byte *pbData = data.SerializedData)
{
MIL_PATHGEOMETRY *pPathGeometry = (MIL_PATHGEOMETRY*)pbData;
// implicitly set pPathGeometry->Flags = 0;
pPathGeometry->FigureCount = 0;
pPathGeometry->Size = (UInt32)size;
}
}
return data;
}
private static Geometry MakeEmptyGeometry()
{
Geometry empty = new StreamGeometry();
empty.Freeze();
return empty;
}
private const double c_tolerance = 0.25;
private static Geometry s_empty = MakeEmptyGeometry();
private static PathGeometryData s_emptyPathGeometryData = MakeEmptyPathGeometryData();
#endregion Private
}
#endregion
}
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