/// <summary>
/// Creates a <see cref="LayerTranslator"/> for the given Lottie layer.
/// </summary>
/// <returns>The <see cref="LayerTranslator"/> that will translate the
/// given Lottie layer to a Shape or a Visual.</returns>
static LayerTranslator CreateTranslatorForLayer(CompositionContext context, Layer layer)
{
if (layer.Is3d)
{
context.Issues.ThreeDLayerIsNotSupported();
}
if (layer.BlendMode != BlendMode.Normal)
{
context.Issues.BlendModeNotNormal(layer.Name, layer.BlendMode.ToString());
}
if (layer.TimeStretch != 1)
{
context.Issues.TimeStretchIsNotSupported();
}
if (layer.IsHidden)
{
return(null);
}
switch (layer.Type)
{
case Layer.LayerType.Image:
return(Images.CreateImageLayerTranslator(context.CreateLayerContext((ImageLayer)layer)));
case Layer.LayerType.Null:
// Null layers only exist to hold transforms when declared as parents of other layers.
return(null);
case Layer.LayerType.PreComp:
return(PreComps.CreatePreCompLayerTranslator(context.CreateLayerContext((PreCompLayer)layer)));
case Layer.LayerType.Shape:
return(Shapes.CreateShapeLayerTranslator(context.CreateLayerContext((ShapeLayer)layer)));
case Layer.LayerType.Solid:
return(SolidLayers.CreateSolidLayerTranslator(context.CreateLayerContext((SolidLayer)layer)));
case Layer.LayerType.Text:
return(TextLayers.CreateTextLayerTranslator(context.CreateLayerContext((TextLayer)layer)));
default:
throw new InvalidOperationException();
}
}
static LayerTranslator?CreateTranslatorForLayer(CompositionContext context, Layer layer)
{
if (layer.IsHidden)
{
// Hidden layers don't need to be translated. Get out before checking
// for any issues - we always render hidden layers correctly (by not
// showing them) so they have no issues.
return(null);
}
if (layer.InPoint >= layer.OutPoint)
{
// We currently don't support layers with InPoint after the OutPoint. In most
// cases this would describe a layer that isn't visible, but if TimeStretch
// is negative it is a layer that plays in reverse, so it is valid to have
// the InPoint after the OutPoint.
return(null);
}
if (layer.Is3d)
{
context.Issues.ThreeDLayerIsNotSupported();
}
if (layer.BlendMode != BlendMode.Normal)
{
context.Issues.BlendModeNotNormal(layer.Name, layer.BlendMode.ToString());
}
if (layer.TimeStretch != 1)
{
context.Issues.TimeStretchIsNotSupported();
}
return(layer.Type switch
{
Layer.LayerType.Image => Images.CreateImageLayerTranslator(context.CreateLayerContext((ImageLayer)layer)),
// Null layers only exist to hold transforms when declared as parents of other layers.
Layer.LayerType.Null => null,
Layer.LayerType.PreComp => PreComps.CreatePreCompLayerTranslator(context.CreateLayerContext((PreCompLayer)layer)),
Layer.LayerType.Shape => Shapes.CreateShapeLayerTranslator(context.CreateLayerContext((ShapeLayer)layer)),
Layer.LayerType.Solid => SolidLayers.CreateSolidLayerTranslator(context.CreateLayerContext((SolidLayer)layer)),
Layer.LayerType.Text => TextLayers.CreateTextLayerTranslator(context.CreateLayerContext((TextLayer)layer)),
_ => throw new InvalidOperationException(),
});