Steven Kirk
9 years ago
8 changed files with 145 additions and 220 deletions
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System; |
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using System.Collections.Generic; |
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using System.Diagnostics; |
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using System.Diagnostics.CodeAnalysis; |
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using Avalonia.Media; |
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using Avalonia.Platform; |
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using Avalonia.VisualTree; |
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namespace Avalonia.Rendering |
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{ |
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/// <summary>
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/// Extension methods for rendering.
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/// </summary>
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/// <remarks>
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/// This class provides implements the platform-independent parts of <see cref="IRenderTarget"/>.
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/// </remarks>
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[SuppressMessage("ReSharper", "LoopCanBeConvertedToQuery")] |
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[SuppressMessage("ReSharper", "ForCanBeConvertedToForeach")] |
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public static class RendererMixin |
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{ |
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private static int s_frameNum; |
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private static int s_fps; |
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private static int s_currentFrames; |
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private static TimeSpan s_lastMeasure; |
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private static readonly Stopwatch s_stopwatch = Stopwatch.StartNew(); |
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private static readonly Stack<List<IVisual>> s_listPool = new Stack<List<IVisual>>(); |
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private static readonly ZIndexComparer s_visualComparer = new ZIndexComparer(); |
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/// <summary>
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/// Gets or sets a value which determines whether an FPS counted will be drawn on each
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/// rendered frame.
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/// </summary>
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public static bool DrawFpsCounter { get; set; } |
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/// <summary>
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/// Renders the specified visual.
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/// </summary>
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/// <param name="renderTarget">IRenderer instance</param>
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/// <param name="visual">The visual to render.</param>
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public static void Render(this IRenderTarget renderTarget, IVisual visual) |
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{ |
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using (var ctx = new DrawingContext(renderTarget.CreateDrawingContext())) |
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{ |
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ctx.Render(visual); |
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s_frameNum++; |
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if (DrawFpsCounter) |
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{ |
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s_currentFrames++; |
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var now = s_stopwatch.Elapsed; |
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var elapsed = now - s_lastMeasure; |
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if (elapsed.TotalSeconds > 1) |
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{ |
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s_fps = (int)(s_currentFrames / elapsed.TotalSeconds); |
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s_currentFrames = 0; |
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s_lastMeasure = now; |
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} |
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var pt = new Point(40, 40); |
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var txt = new FormattedText( |
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"Frame #" + s_frameNum + " FPS: " + s_fps, |
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"Arial", |
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18, |
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Size.Infinity, |
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FontStyle.Normal, |
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TextAlignment.Left, |
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FontWeight.Normal, |
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TextWrapping.NoWrap); |
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ctx.FillRectangle(Brushes.White, new Rect(pt, txt.Measure())); |
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ctx.DrawText(Brushes.Black, pt, txt); |
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} |
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} |
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} |
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/// <summary>
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/// Renders the specified visual.
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/// </summary>
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/// <param name="visual">The visual to render.</param>
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/// <param name="context">The drawing context.</param>
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public static void Render(this DrawingContext context, IVisual visual) |
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{ |
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context.Render(visual, visual.Bounds); |
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} |
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/// <summary>
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/// Renders the specified visual.
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/// </summary>
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/// <param name="visual">The visual to render.</param>
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/// <param name="context">The drawing context.</param>
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/// <param name="clipRect">
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/// The current clip rect, in coordinates relative to <paramref name="visual"/>.
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/// </param>
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private static void Render(this DrawingContext context, IVisual visual, Rect clipRect) |
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{ |
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var opacity = visual.Opacity; |
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var clipToBounds = visual.ClipToBounds; |
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var bounds = new Rect(visual.Bounds.Size); |
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if (visual.IsVisible && opacity > 0) |
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{ |
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var m = Matrix.CreateTranslation(visual.Bounds.Position); |
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var renderTransform = Matrix.Identity; |
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if (visual.RenderTransform != null) |
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{ |
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var origin = visual.RenderTransformOrigin.ToPixels(new Size(visual.Bounds.Width, visual.Bounds.Height)); |
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var offset = Matrix.CreateTranslation(origin); |
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renderTransform = (-offset) * visual.RenderTransform.Value * (offset); |
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} |
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m = renderTransform * m; |
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if (clipToBounds) |
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{ |
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clipRect = clipRect.Intersect(new Rect(visual.Bounds.Size)); |
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} |
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using (context.PushPostTransform(m)) |
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using (context.PushOpacity(opacity)) |
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using (clipToBounds ? context.PushClip(bounds) : default(DrawingContext.PushedState)) |
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using (visual.Clip != null ? context.PushGeometryClip(visual.Clip) : default(DrawingContext.PushedState)) |
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using (visual.OpacityMask != null ? context.PushOpacityMask(visual.OpacityMask, bounds) : default(DrawingContext.PushedState)) |
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using (context.PushTransformContainer()) |
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{ |
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visual.Render(context); |
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#pragma warning disable 0618
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var transformed = |
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new TransformedBounds(bounds, new Rect(), context.CurrentContainerTransform); |
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#pragma warning restore 0618
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if (visual is Visual) |
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{ |
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BoundsTracker.SetTransformedBounds((Visual)visual, transformed); |
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} |
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var lst = GetSortedVisualList(visual.VisualChildren); |
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foreach (var child in lst) |
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{ |
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var childBounds = GetTransformedBounds(child); |
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if (!child.ClipToBounds || clipRect.Intersects(childBounds)) |
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{ |
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var childClipRect = clipRect.Translate(-childBounds.Position); |
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context.Render(child, childClipRect); |
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} |
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else |
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{ |
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ClearTransformedBounds(child); |
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} |
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} |
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ReturnListToPool(lst); |
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} |
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} |
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if (!visual.IsVisible) |
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{ |
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ClearTransformedBounds(visual); |
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} |
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} |
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private static void ClearTransformedBounds(IVisual visual) |
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{ |
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foreach (var e in visual.GetSelfAndVisualDescendents()) |
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{ |
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BoundsTracker.SetTransformedBounds((Visual)visual, null); |
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} |
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} |
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private static void ReturnListToPool(List<IVisual> lst) |
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{ |
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lst.Clear(); |
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s_listPool.Push(lst); |
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} |
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private static List<IVisual> GetSortedVisualList(IReadOnlyList<IVisual> source) |
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{ |
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var lst = s_listPool.Count == 0 ? new List<IVisual>() : s_listPool.Pop(); |
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for (var c = 0; c < source.Count; c++) |
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lst.Add(source[c]); |
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lst.Sort(s_visualComparer); |
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return lst; |
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} |
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private static Rect GetTransformedBounds(IVisual visual) |
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{ |
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if (visual.RenderTransform == null) |
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{ |
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return visual.Bounds; |
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} |
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else |
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{ |
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var origin = visual.RenderTransformOrigin.ToPixels(new Size(visual.Bounds.Width, visual.Bounds.Height)); |
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var offset = Matrix.CreateTranslation(visual.Bounds.Position + origin); |
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var m = (-offset) * visual.RenderTransform.Value * (offset); |
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return visual.Bounds.TransformToAABB(m); |
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} |
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} |
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class ZIndexComparer : IComparer<IVisual> |
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{ |
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public int Compare(IVisual x, IVisual y) => x.ZIndex.CompareTo(y.ZIndex); |
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} |
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} |
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} |
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