// Copyright 2017 The Fuchsia Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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library fuchsia.ui.gfx;
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// These are the types of nodes that can be created within a Mozart |Session|.
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//
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// All nodes have an associated transform, which distinguishes them from mere
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// resources. Nodes may also have one or more node Characteristics:
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//
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// These are characteristics that each type of |Node| either has or doesn't.
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// These constrain operations that reference nodes; violations will cause the
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// |Session| connection to be closed. For example, |NodeAddChildOp| must target
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// a node with the "has_children" characteristic. These characteristics are not
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// explicitly reflected in the Session API; instead, they must be enforced by
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// implementations of the API.
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// - has_children: The node can contain other nodes as children.
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// - has_parent: The node can be a child of another node. If this is false,
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// the node can only be a direct descendant of its containing scene.
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// - has_parts: The node can contain other nodes as parts. All parts must be
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// from the same session as their parent.
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// - has_clip: The node can contain a clip node as a child.
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// - is_clip: The node can clip other nodes.
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// - has_shape: The node can contain ShapeNodes as children.
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// - has_material: The node can have a Material resource applied to it.
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// Characteristics:
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// - has_parent
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// - has_shape
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// - has_material
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struct ShapeNodeArgs {
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// TODO(SCN-694): Clean up dummy args.
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uint32 unused = 0;
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};
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// Characteristics:
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// - has_parent
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// - is_clip
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// - has_parts
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struct ClipNodeArgs {
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// TODO(SCN-694): Clean up dummy args.
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uint32 unused = 0;
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};
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// Characteristics:
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// - has_transform
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// - has_parent
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// - has_children
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// - has_parts
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// - has_opacity
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struct OpacityNodeArgs {
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uint32 unused = 0;
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};
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// Characteristics:
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// - has_transform
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// - has_children
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// - has_parent
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// - has_parts
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// - has_clip
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struct EntityNodeArgs {
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// TODO(SCN-694): Clean up dummy args.
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uint32 unused = 0;
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};
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