public virtual void Update(ServerCompositionTarget root)
{
if (Parent == null && Root == null)
{
return;
}
var wasVisible = IsVisibleInFrame;
// Calculate new parent-relative transform
if (_combinedTransformDirty)
{
CombinedTransformMatrix = MatrixUtils.ComputeTransform(Size, AnchorPoint, CenterPoint,
// HACK: Ignore RenderTransform set by the adorner layer
AdornedVisual != null ? Matrix4x4.Identity : TransformMatrix,
Scale, RotationAngle, Orientation, Offset);
_combinedTransformDirty = false;
}
var parentTransform = (AdornedVisual ?? Parent)?.GlobalTransformMatrix ?? Matrix4x4.Identity;
var newTransform = CombinedTransformMatrix * parentTransform;
// Check if visual was moved and recalculate face orientation
var positionChanged = false;
if (GlobalTransformMatrix != newTransform)
{
_isBackface = Vector3.Transform(
new Vector3(0, 0, float.PositiveInfinity), GlobalTransformMatrix).Z <= 0;
positionChanged = true;
}
var oldTransformedContentBounds = TransformedOwnContentBounds;
var oldCombinedTransformedClipBounds = _combinedTransformedClipBounds;
if (_parent?.IsDirtyComposition == true)
{
IsDirtyComposition = true;
_isDirtyForUpdate = true;
}
var invalidateOldBounds = _isDirtyForUpdate;
var invalidateNewBounds = _isDirtyForUpdate;
GlobalTransformMatrix = newTransform;
var ownBounds = OwnContentBounds;
if (ownBounds != _oldOwnContentBounds || positionChanged)
{
_oldOwnContentBounds = ownBounds;
if (ownBounds.IsEmpty)
{
TransformedOwnContentBounds = default;
}
else
{
TransformedOwnContentBounds =
ownBounds.TransformToAABB(MatrixUtils.ToMatrix(GlobalTransformMatrix));
}
}
if (_clipSizeDirty || positionChanged)
{
_transformedClipBounds = ClipToBounds
? new Rect(new Size(Size.X, Size.Y))
.TransformToAABB(MatrixUtils.ToMatrix(GlobalTransformMatrix))
: null;
_clipSizeDirty = false;
}
_combinedTransformedClipBounds = Parent?._combinedTransformedClipBounds ?? new Rect(Root !.Size);
if (_transformedClipBounds != null)
{
_combinedTransformedClipBounds = _combinedTransformedClipBounds.Intersect(_transformedClipBounds.Value);
}
EffectiveOpacity = Opacity * (Parent?.EffectiveOpacity ?? 1);
IsVisibleInFrame = _parent?.IsVisibleInFrame != false && Visible && EffectiveOpacity > 0.04 && !_isBackface &&
!_combinedTransformedClipBounds.IsEmpty;
if (wasVisible != IsVisibleInFrame || positionChanged)
{
invalidateOldBounds |= wasVisible;
invalidateNewBounds |= IsVisibleInFrame;
}
// Invalidate new bounds
if (invalidateNewBounds)
{
AddDirtyRect(TransformedOwnContentBounds.Intersect(_combinedTransformedClipBounds));
}
if (invalidateOldBounds)
{
AddDirtyRect(oldTransformedContentBounds.Intersect(oldCombinedTransformedClipBounds));
}
_isDirtyForUpdate = false;
// Update readback indices
var i = Root !.Readback;
ref var readback = ref GetReadback(i.WriteIndex);