Added serialization to protobufs for property trees.

cc/proto/property_tree.proto

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+import "rectf.proto";
+import "scroll_offset.proto";
+import "transform.proto";
+import "vector2df.proto";
+
+option optimize_for = LITE_RUNTIME;
+
+package cc.proto;
+
+// The messages declared in this file correspond to the classes declared in
+// cc/trees/property_tree.h
+
+// Proto for struct TransformNodeData.
+message TranformNodeData {
+  optional Transform pre_local = 1;
+  optional Transform local = 2;
+  optional Transform post_local = 3;
+  optional Transform to_parent = 4;
+  optional Transform to_target = 5;
+  optional Transform from_target = 6;
+  optional Transform to_screen = 7;
+  optional Transform from_screen = 8;
+
+  optional int64 target_id = 9;
+  optional int64 content_target_id = 10;
+  optional int64 source_node_id = 11;
+  optional bool needs_local_transform_update = 12;
+  optional bool is_invertible = 13;
+  optional bool ancestors_are_invertible = 14;
+  optional bool is_animated = 15;
+  optional bool to_screen_is_animated = 16;
+  optional bool has_only_translation_animations = 17;
+  optional bool to_screen_has_scale_animation = 18;
+  optional bool flattens_inherited_transform = 19;
+  optional bool node_and_ancestors_are_flat = 20;
+  optional bool node_and_ancestors_have_only_integer_translation = 21;
+  optional bool scrolls = 22;
+  optional bool needs_sublayer_scale = 23;
+  optional bool affected_by_inner_viewport_bounds_delta_x = 24;
+  optional bool affected_by_inner_viewport_bounds_delta_y = 25;
+  optional bool affected_by_outer_viewport_bounds_delta_x = 26;
+  optional bool affected_by_outer_viewport_bounds_delta_y = 27;
+  optional bool in_subtree_of_page_scale_layer = 28;
+  optional float post_local_scale_factor = 29;
+  optional float local_maximum_animation_target_scale = 30;
+  optional float local_starting_animation_scale = 31;
+  optional float combined_maximum_animation_target_scale = 32;
+  optional float combined_starting_animation_scale = 33;
+
+  optional Vector2dF sublayer_scale = 34;
+  optional ScrollOffset scroll_offset = 35;
+  optional Vector2dF scroll_snap = 36;
+  optional Vector2dF source_offset = 37;
+  optional Vector2dF source_to_parent = 38;
+}
+
+// Proto for struct ClipNodeData.
+message ClipNodeData {
+  optional RectF clip = 1;
+  optional RectF combined_clip_in_target_space = 2;
+  optional RectF clip_in_target_space = 3;
+
+  optional int64 transform_id = 4;
+  optional int64 target_id = 5;
+  optional bool applies_local_clip = 6;
+  optional bool layer_clipping_uses_only_local_clip = 7;
+  optional bool target_is_clipped = 8;
+  optional bool layers_are_clipped = 9;
+  optional bool layers_are_clipped_when_surfaces_disabled = 10;
+  optional bool resets_clip = 11;
+}
+
+// Proto for struct EffectNodeData.
+message EffectNodeData {
+  optional float opacity = 1;
+  optional float screen_space_opacity = 2;
+  optional bool has_render_surface = 3;
+  optional int64 transform_id = 4;
+  optional int64 clip_id = 5;
+}
+
+// This defines the proto used for all types of struct TreeNode.
+message TreeNode {
+  // The following fields are the base TreeNode properties. This list
+  // corresponds to the data members from struct TreeNode.
+  optional int64 id = 1;
+  optional int64 parent_id = 2;
+  optional int64 owner_id = 3;
+
+  // The following fields correspond to the possible values for TreeNode::data.
+  // Only one of these fields should be set, based on the type of property tree
+  // this node belongs to.
+  optional TranformNodeData transform_node_data = 1000;
+  optional ClipNodeData clip_node_data = 1001;
+  optional EffectNodeData effect_node_data = 1002;
+}
+
+// This defines the proto used for all property trees. PropertyType denotes the
+// type of this tree.
+message PropertyTree {
+  enum PropertyType {
+    Transform = 1;
+    Clip = 2;
+    Effect = 3;
+  }
+
+  // The following fields are the base PropertyTree properties. This list
+  // corresponds to the data members from class PropertyTree.
+  optional PropertyType property_type = 1;
+  repeated TreeNode nodes = 2;
+  optional bool needs_update = 3;
+
+  // The following fields denote the data members for each subclass of
+  // PropertyTree. Only one of these fields should be set, depending on the type
+  // of this property tree.
+  optional TransformTreeData transform_tree_data = 1000;
+}
+
+// Proto for data members of class TransformTree.
+message TransformTreeData {
+  optional bool source_to_parent_updates_allowed = 1;
+  optional float page_scale_factor = 2;
+  optional float device_scale_factor = 3;
+  optional float device_transform_scale_factor = 4;
+  optional Vector2dF inner_viewport_bounds_delta = 5;
+  optional Vector2dF outer_viewport_bounds_delta = 6;
+  repeated int64 nodes_affected_by_inner_viewport_bounds_delta = 7
+      [packed = true];

[vmpstr, 2015/11/19 23:24:51]

What's packed?

[Khushal, 2015/11/20 01:42:09]

It's a data efficient way to write the repeated fields.
https://developers.google.com/protocol-buffers/docs/encoding?hl=en#packed-rep...

+  repeated int64 nodes_affected_by_outer_viewport_bounds_delta = 8
+      [packed = true];
+}
+
+// Proto for class PropertyTrees.
+message PropertyTrees {
+  optional PropertyTree transform_tree = 1;
+  optional PropertyTree effect_tree = 2;
+  optional PropertyTree clip_tree = 3;
+
+  optional bool needs_rebuild = 4;
+  optional bool non_root_surfaces_enabled = 5;
+  optional int64 sequence_number = 6;
+}