fn register_transform(
metadatas: &mut Vec<TransformMetadata>,
transforms: &mut Vec<TransformData, FrameAllocator>,
transform: LayoutToPictureTransform,
) -> usizefn register_transform(
metadatas: &mut Vec<TransformMetadata>,
transforms: &mut Vec<TransformData, FrameAllocator>,
transform: LayoutToPictureTransform,
) -> usize