Adds a CloneAndAnimate function to WindowManagerInternalClient

mojo/services/view_manager/display_manager.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 "mojo/services/view_manager/display_manager.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
@@ skipping 13 matching lines @@
                   const ServerView* view,
                   const gfx::Vector2d& offset) {
   if (!view->visible())
     return;
 
   const gfx::Rect node_bounds = view->bounds() + offset;
   std::vector<const ServerView*> children(view->GetChildren());
   for (std::vector<const ServerView*>::reverse_iterator it = children.rbegin();
        it != children.rend();
        ++it) {
-    DrawViewTree(pass, *it, offset + view->bounds().OffsetFromOrigin());
+    DrawViewTree(pass, *it, node_bounds.OffsetFromOrigin());
   }
 
   cc::SurfaceId node_id = view->surface_id();
 
   SurfaceQuadStatePtr surface_quad_state = SurfaceQuadState::New();
   surface_quad_state->surface = SurfaceId::From(node_id);
 
   gfx::Transform node_transform;
   node_transform.Translate(node_bounds.x(), node_bounds.y());
 
   QuadPtr surface_quad = Quad::New();
   surface_quad->material = Material::MATERIAL_SURFACE_CONTENT;
   surface_quad->rect = Rect::From(node_bounds);
   surface_quad->opaque_rect = Rect::From(node_bounds);
   surface_quad->visible_rect = Rect::From(node_bounds);
   surface_quad->needs_blending = true;
   surface_quad->shared_quad_state_index =
       base::saturated_cast<int32_t>(pass->shared_quad_states.size());
   surface_quad->surface_quad_state = surface_quad_state.Pass();
 
   SharedQuadStatePtr sqs = CreateDefaultSQS(*Size::From(node_bounds.size()));
+  sqs->blend_mode = SK_XFERMODE_kSrcOver_Mode;
+  sqs->opacity = view->opacity();

[msw, 2014/11/18 23:37:42]

q: will applying the same opacity throughout the view tree in your stub
animation make nested views render progressively more transparent?

[sky, 2014/11/19 00:49:39]

Yes. Opacity is inherited.

[msw, 2014/11/19 01:27:51]

Acknowledged.

   sqs->content_to_target_transform = Transform::From(node_transform);
 
   pass->quads.push_back(surface_quad.Pass());
   pass->shared_quad_states.push_back(sqs.Pass());
 }
 
 }  // namespace
 
 DefaultDisplayManager::DefaultDisplayManager(
     ApplicationConnection* app_connection,
@@ skipping 104 matching lines @@
   SchedulePaint(connection_manager_->root(), gfx::Rect(size_));
 }
 
 void DefaultDisplayManager::ReturnResources(
     Array<ReturnedResourcePtr> resources) {
   DCHECK_EQ(0u, resources.size());
 }
 
 }  // namespace service
 }  // namespace mojo