Add ClipNode when Render Surface Inherits Clip

cc/trees/property_tree.cc

 // Copyright 2014 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.
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
 #include "cc/base/math_util.h"
 #include "cc/trees/property_tree.h"
@@ skipping 76 matching lines @@
     const gfx::PointF& position,
     const gfx::Point3F& transform_origin) {
   post_local.MakeIdentity();
   post_local.Scale(post_local_scale_factor, post_local_scale_factor);
   post_local.Translate3d(
       position.x() + source_offset.x() + transform_origin.x(),
       position.y() + source_offset.y() + transform_origin.y(),
       transform_origin.z());
 }
 
-ClipNodeData::ClipNodeData() : transform_id(-1), target_id(-1) {
-}
+ClipNodeData::ClipNodeData()
+    : transform_id(-1),
+      target_id(-1),
+      inherit_parent_target_space_clip(false) {}
 
 OpacityNodeData::OpacityNodeData() : opacity(1.f), screen_space_opacity(1.f) {
 }
 
 void TransformTree::clear() {
   PropertyTree<TransformNode>::clear();
 
   nodes_affected_by_inner_viewport_bounds_delta_.clear();
   nodes_affected_by_outer_viewport_bounds_delta_.clear();
 }
@@ skipping 31 matching lines @@
 bool TransformTree::ComputeTransformWithSourceSublayerScale(
     int source_id,
     int dest_id,
     gfx::Transform* transform) const {
   bool success = ComputeTransform(source_id, dest_id, transform);
 
   const TransformNode* source_node = Node(source_id);
   if (!source_node->data.needs_sublayer_scale)
     return success;
 
+  if (source_node->data.sublayer_scale.x() == 0 ||
+      source_node->data.sublayer_scale.y() == 0)
+    return false;
+
   transform->Scale(1.f / source_node->data.sublayer_scale.x(),
                    1.f / source_node->data.sublayer_scale.y());
   return success;
 }
 
 bool TransformTree::Are2DAxisAligned(int source_id, int dest_id) const {
   gfx::Transform transform;
   return ComputeTransform(source_id, dest_id, &transform) &&
          transform.Preserves2dAxisAlignment();
 }
@@ skipping 336 matching lines @@
   if (parent_node)
     node->data.node_and_ancestors_have_only_integer_translation =
         node->data.node_and_ancestors_have_only_integer_translation &&
         parent_node->data.node_and_ancestors_have_only_integer_translation;
 }
 
 PropertyTrees::PropertyTrees() : needs_rebuild(true), sequence_number(0) {
 }
 
 }  // namespace cc