Introduce Property Trees

cc/layers/layer.cc

 // Copyright 2010 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 "cc/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/debug/trace_event.h"
@@ skipping 31 matching lines @@
       num_dependents_need_push_properties_(false),
       stacking_order_changed_(false),
       // Layer IDs start from 1.
       layer_id_(g_next_layer_id.GetNext() + 1),
       ignore_set_needs_commit_(false),
       sorting_context_id_(0),
       parent_(nullptr),
       layer_tree_host_(nullptr),
       scroll_clip_layer_id_(INVALID_ID),
       num_descendants_that_draw_content_(0),
+      transform_tree_index_(-1),
+      opacity_tree_index_(-1),
+      clip_tree_index_(-1),
       should_scroll_on_main_thread_(false),
       have_wheel_event_handlers_(false),
       have_scroll_event_handlers_(false),
       user_scrollable_horizontal_(true),
       user_scrollable_vertical_(true),
       is_root_for_isolated_group_(false),
       is_container_for_fixed_position_layers_(false),
       is_drawable_(false),
       draws_content_(false),
       hide_layer_and_subtree_(false),
@@ skipping 1164 matching lines @@
   DCHECK_GE(num_descendants_that_draw_content_, 0);
   DCHECK_GE(num_descendants_that_draw_content_ + num, 0);
   if (num == 0)
     return;
   num_descendants_that_draw_content_ += num;
   SetNeedsCommit();
   if (parent())
     parent()->AddDrawableDescendants(num);
 }
 
+bool Layer::NeedsVisibleRectUpdated() const {
+  return DrawsContent();
+}
+
 void Layer::RunMicroBenchmark(MicroBenchmark* benchmark) {
   benchmark->RunOnLayer(this);
 }
 
 bool Layer::HasDelegatedContent() const {
   return false;
 }
 
+gfx::Transform Layer::debug_screen_space_transform(
+    const TransformTree& tree) const {
+  gfx::Transform xform(1, 0, 0, 1, offset_to_transform_parent().x(),
+                       offset_to_transform_parent().y());
+  if (transform_tree_index() >= 0) {
+    gfx::Transform ssxform = tree.Node(transform_tree_index())->data.to_screen;
+    xform.ConcatTransform(ssxform);
+  }
+  xform.Scale(1.0 / contents_scale_x(), 1.0 / contents_scale_y());
+  return xform;
+}
+
+gfx::Transform Layer::debug_draw_transform(const TransformTree& tree) const {
+  if (!has_render_target())
+    return debug_screen_space_transform(tree);
+
+  gfx::Transform xform(1, 0, 0, 1, offset_to_transform_parent().x(),
+                       offset_to_transform_parent().y());
+  if (transform_tree_index() >= 0) {
+    gfx::Transform ssxform;
+    ComputeTransform(tree, transform_tree_index(),
+                     render_target()->transform_tree_index(), &ssxform);
+    xform.ConcatTransform(ssxform);
+  }
+  xform.Scale(1.0 / contents_scale_x(), 1.0 / contents_scale_y());
+  return xform;
+}
+
 }  // namespace cc