private static void PropagateLayer(VisualNode node, SceneLayer layer, SceneLayer oldLayer)
{
node.LayerRoot = layer.LayerRoot;
layer.Dirty.Add(node.Bounds);
oldLayer.Dirty.Add(node.Bounds);
foreach (VisualNode child in node.Children)
{
// If the child is not the start of a new layer, recurse.
if (child.LayerRoot != child.Visual)
{
PropagateLayer(child, layer, oldLayer);
}
}
}
private static void UpdateLayer(VisualNode node, SceneLayer layer)
{
layer.Opacity = node.Visual.Opacity;
if (node.Visual.OpacityMask != null)
{
layer.OpacityMask = node.Visual.OpacityMask?.ToImmutable();
layer.OpacityMaskRect = node.ClipBounds;
}
else
{
layer.OpacityMask = null;
layer.OpacityMaskRect = Rect.Empty;
}
layer.GeometryClip = node.HasAncestorGeometryClip ?
CreateLayerGeometryClip(node) :
null;
}
private static void ClearLayer(Scene scene, VisualNode node)
{
var parent = (VisualNode)node.Parent;
var oldLayerRoot = node.LayerRoot;
var newLayerRoot = parent.LayerRoot;
var existingDirtyRects = scene.Layers[node.LayerRoot].Dirty;
var newDirtyRects = scene.Layers[newLayerRoot].Dirty;
existingDirtyRects.Coalesce();
foreach (var r in existingDirtyRects)
{
newDirtyRects.Add(r);
}
var oldLayer = scene.Layers[oldLayerRoot];
PropagateLayer(node, scene.Layers[newLayerRoot], oldLayer);
scene.Layers.Remove(oldLayer);
}
private VisualNode Clone(VisualNode source, IVisualNode parent, Dictionary <IVisual, IVisualNode> index)
{
var result = source.Clone(parent);
index.Add(result.Visual, result);
int childCount = source.Children.Count;
if (childCount > 0)
{
Span <IVisualNode> children = result.AddChildrenSpan(childCount);
for (var i = 0; i < childCount; i++)
{
var child = source.Children[i];
children[i] = Clone((VisualNode)child, result, index);
}
}
return(result);
}
private static IGeometryImpl CreateLayerGeometryClip(VisualNode node)
{
IGeometryImpl result = null;
for (;;)
{
node = (VisualNode)node.Parent;
if (node == null || (node.GeometryClip == null && !node.HasAncestorGeometryClip))
{
break;
}
if (node?.GeometryClip != null)
{
var transformed = node.GeometryClip.WithTransform(node.Transform);
result = result == null ? transformed : result.Intersect(transformed);
}
}
return(result);
}
private VisualNode Clone(VisualNode source, IVisualNode?parent, Dictionary <IVisual, IVisualNode> index)
{
var result = source.Clone(parent);
index.Add(result.Visual, result);
var children = source.Children;
var childrenCount = children.Count;
if (childrenCount > 0)
{
result.TryPreallocateChildren(childrenCount);
for (var i = 0; i < childrenCount; i++)
{
var child = children[i];
result.AddChild(Clone((VisualNode)child, result, index));
}
}
return(result);
}
private static void Deindex(Scene scene, VisualNode node)
{
foreach (VisualNode child in node.Children)
{
if (child is VisualNode visual)
{
Deindex(scene, visual);
}
}
scene.Remove(node);
node.SubTreeUpdated = true;
scene.Layers[node.LayerRoot].Dirty.Add(node.Bounds);
node.Visual.TransformedBounds = null;
if (node.LayerRoot == node.Visual && node.Visual != scene.Root.Visual)
{
scene.Layers.Remove(node.LayerRoot);
}
}
/// <summary>
/// Informs the drawing context of the visual node that is about to be rendered.
/// </summary>
/// <param name="node">The visual node.</param>
/// <returns>
/// An object which when disposed will commit the changes to visual node.
/// </returns>
public UpdateState BeginUpdate(VisualNode node)
{
Contract.Requires<ArgumentNullException>(node != null);
if (_node != null)
{
if (_childIndex < _node.Children.Count)
{
_node.ReplaceChild(_childIndex, node);
}
else
{
_node.AddChild(node);
}
++_childIndex;
}
var state = new UpdateState(this, _node, _childIndex, _drawOperationindex);
_node = node;
_childIndex = _drawOperationindex = 0;
return state;
}
/// <summary>
/// Informs the drawing context of the visual node that is about to be rendered.
/// </summary>
/// <param name="node">The visual node.</param>
/// <returns>
/// An object which when disposed will commit the changes to visual node.
/// </returns>
public UpdateState BeginUpdate(VisualNode node)
{
_ = node ?? throw new ArgumentNullException(nameof(node));
if (_node != null)
{
if (_childIndex < _node.Children.Count)
{
_node.ReplaceChild(_childIndex, node);
}
else
{
_node.AddChild(node);
}
++_childIndex;
}
var state = new UpdateState(this, _node, _childIndex, _drawOperationindex);
_node = node;
_childIndex = _drawOperationindex = 0;
return(state);
}
private static void Update(DrawingContext context, Scene scene, VisualNode node, Rect clip, bool forceRecurse)
{
var visual = node.Visual;
var opacity = visual.Opacity;
var clipToBounds = visual.ClipToBounds;
var bounds = new Rect(visual.Bounds.Size);
var contextImpl = (DeferredDrawingContextImpl)context.PlatformImpl;
contextImpl.Layers.Find(node.LayerRoot)?.Dirty.Add(node.Bounds);
if (visual.IsVisible)
{
var m = Matrix.CreateTranslation(visual.Bounds.Position);
var renderTransform = Matrix.Identity;
if (visual.RenderTransform != null)
{
var origin = visual.RenderTransformOrigin.ToPixels(new Size(visual.Bounds.Width, visual.Bounds.Height));
var offset = Matrix.CreateTranslation(origin);
renderTransform = (-offset) * visual.RenderTransform.Value * (offset);
}
m = renderTransform * m;
using (contextImpl.BeginUpdate(node))
using (context.PushPostTransform(m))
using (context.PushTransformContainer())
{
var clipBounds = bounds.TransformToAABB(contextImpl.Transform).Intersect(clip);
forceRecurse = forceRecurse ||
node.Transform != contextImpl.Transform ||
node.ClipBounds != clipBounds;
node.Transform = contextImpl.Transform;
node.ClipBounds = clipBounds;
node.ClipToBounds = clipToBounds;
node.GeometryClip = visual.Clip?.PlatformImpl;
node.Opacity = opacity;
// TODO: Check equality between node.OpacityMask and visual.OpacityMask before assigning.
node.OpacityMask = visual.OpacityMask?.ToImmutable();
if (ShouldStartLayer(visual))
{
if (node.LayerRoot != visual)
{
MakeLayer(scene, node);
}
else
{
UpdateLayer(node, scene.Layers[node.LayerRoot]);
}
}
else if (node.LayerRoot == node.Visual && node.Parent != null)
{
ClearLayer(scene, node);
}
if (node.ClipToBounds)
{
clip = clip.Intersect(node.ClipBounds);
}
try
{
visual.Render(context);
}
catch { }
var transformed = new TransformedBounds(new Rect(visual.Bounds.Size), clip, node.Transform);
visual.TransformedBounds = transformed;
if (forceRecurse)
{
foreach (var child in visual.VisualChildren.OrderBy(x => x, ZIndexComparer.Instance))
{
var childNode = scene.FindNode(child) ?? CreateNode(scene, child, node);
Update(context, scene, (VisualNode)childNode, clip, forceRecurse);
}
node.SubTreeUpdated = true;
contextImpl.TrimChildren();
}
}
}
}
private static void Update(DrawingContext context, Scene scene, VisualNode node, Rect clip, bool forceRecurse)
{
var visual = node.Visual;
var opacity = visual.Opacity;
var clipToBounds = visual.ClipToBounds;
#pragma warning disable CS0618 // Type or member is obsolete
var clipToBoundsRadius = visual is IVisualWithRoundRectClip roundRectClip ?
roundRectClip.ClipToBoundsRadius :
default;
#pragma warning restore CS0618 // Type or member is obsolete
var bounds = new Rect(visual.Bounds.Size);
var contextImpl = (DeferredDrawingContextImpl)context.PlatformImpl;
contextImpl.Layers.Find(node.LayerRoot)?.Dirty.Add(node.Bounds);
if (visual.IsVisible)
{
var m = node != scene.Root ?
Matrix.CreateTranslation(visual.Bounds.Position) :
Matrix.Identity;
var renderTransform = Matrix.Identity;
if (visual.RenderTransform != null)
{
var origin = visual.RenderTransformOrigin.ToPixels(new Size(visual.Bounds.Width, visual.Bounds.Height));
var offset = Matrix.CreateTranslation(origin);
renderTransform = (-offset) * visual.RenderTransform.Value * (offset);
}
m = renderTransform * m;
using (contextImpl.BeginUpdate(node))
using (context.PushPostTransform(m))
using (context.PushTransformContainer())
{
var globalBounds = bounds.TransformToAABB(contextImpl.Transform);
var clipBounds = clipToBounds ?
globalBounds.Intersect(clip) :
clip;
forceRecurse = forceRecurse ||
node.ClipBounds != clipBounds ||
node.Opacity != opacity ||
node.Transform != contextImpl.Transform;
node.Transform = contextImpl.Transform;
node.ClipBounds = clipBounds;
node.ClipToBounds = clipToBounds;
node.LayoutBounds = globalBounds;
node.ClipToBoundsRadius = clipToBoundsRadius;
node.GeometryClip = visual.Clip?.PlatformImpl;
node.Opacity = opacity;
// TODO: Check equality between node.OpacityMask and visual.OpacityMask before assigning.
node.OpacityMask = visual.OpacityMask?.ToImmutable();
if (ShouldStartLayer(visual))
{
if (node.LayerRoot != visual)
{
MakeLayer(scene, node);
}
else
{
UpdateLayer(node, scene.Layers[node.LayerRoot]);
}
}
else if (node.LayerRoot == node.Visual && node.Parent != null)
{
ClearLayer(scene, node);
}
if (node.ClipToBounds)
{
clip = clip.Intersect(node.ClipBounds);
}
try
{
visual.Render(context);
}
catch { }
var transformed = new TransformedBounds(new Rect(visual.Bounds.Size), clip, node.Transform);
visual.TransformedBounds = transformed;
if (forceRecurse)
{
var visualChildren = (IList <IVisual>)visual.VisualChildren;
node.TryPreallocateChildren(visualChildren.Count);
if (visualChildren.Count == 1)
{
var childNode = GetOrCreateChildNode(scene, visualChildren[0], node);
Update(context, scene, (VisualNode)childNode, clip, forceRecurse);
}
else if (visualChildren.Count > 1)
{
var count = visualChildren.Count;
var sortedChildren = new (IVisual visual, int index)[count];