97 lines
3.2 KiB
C#
97 lines
3.2 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Windows;
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using System.Windows.Media;
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using Jewelry.Collections;
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using WPFDark.Internals;
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namespace WPFDark.Internals
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{
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internal static class DrawingContextExtensions
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{
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internal static void DrawBezier(this DrawingContext dc, ImmutableVec2_double[ /*4*/] bezierPoints, Pen pen)
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{
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var hashCode = MakeHashCode(bezierPoints);
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if (_bezierCache.TryGetValue(hashCode, out var curve) == false)
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{
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curve = new StreamGeometry();
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using (var ctx = curve.Open())
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{
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ctx.BeginFigure(
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Unsafe.As<ImmutableVec2_double, Point>(ref bezierPoints[0]),
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false,
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false
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);
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ctx.BezierTo(
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Unsafe.As<ImmutableVec2_double, Point>(ref bezierPoints[1]),
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Unsafe.As<ImmutableVec2_double, Point>(ref bezierPoints[2]),
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Unsafe.As<ImmutableVec2_double, Point>(ref bezierPoints[3]),
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true,
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false);
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}
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curve.Freeze();
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_bezierCache.Add(hashCode, curve);
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}
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dc.DrawGeometry(null, pen, curve);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static long MakeHashCode(Span<ImmutableVec2_double> src)
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{
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unchecked
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{
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var srcPrim = MemoryMarshal.Cast<ImmutableVec2_double, double>(src);
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var p0X = Unsafe.As<double, long>(ref srcPrim[0]);
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var p0Y = Unsafe.As<double, long>(ref srcPrim[1]);
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var p1X = Unsafe.As<double, long>(ref srcPrim[2]);
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var p1Y = Unsafe.As<double, long>(ref srcPrim[3]);
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var p2X = Unsafe.As<double, long>(ref srcPrim[4]);
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var p2Y = Unsafe.As<double, long>(ref srcPrim[5]);
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var p3X = Unsafe.As<double, long>(ref srcPrim[6]);
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var p3Y = Unsafe.As<double, long>(ref srcPrim[7]);
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var hashCode = p0X;
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hashCode = (hashCode * 397) ^ p0Y;
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hashCode = (hashCode * 397) ^ p1X;
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hashCode = (hashCode * 397) ^ p1Y;
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hashCode = (hashCode * 397) ^ p2X;
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hashCode = (hashCode * 397) ^ p2Y;
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hashCode = (hashCode * 397) ^ p3X;
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hashCode = (hashCode * 397) ^ p3Y;
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return hashCode;
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}
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}
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internal static void DrawCircle(this DrawingContext dc, Brush brush, Pen pen, Point pos, double radius)
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{
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var geom = new StreamGeometry
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{
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FillRule = FillRule.Nonzero
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};
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using (var ctx = geom.Open())
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{
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ctx.DrawEllipse(
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pos,
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radius,
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radius,
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true,
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true);
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}
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dc.DrawGeometry(brush, pen, geom);
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}
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private static readonly LruCache<long, StreamGeometry> _bezierCache = new LruCache<long, StreamGeometry>(10000);
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}
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} |