Generalize layer mirroring for phantom windows

ui/compositor/layer.cc

 // Copyright (c) 2012 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 "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 10 matching lines @@
 #include "cc/layers/texture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/filter_operation.h"
 #include "cc/output/filter_operations.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "cc/resources/transferable_resource.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer_animator.h"
-#include "ui/compositor/layer_observer.h"
 #include "ui/compositor/paint_context.h"
 #include "ui/gfx/animation/animation.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/interpolated_transform.h"
 
 namespace {
 
@@ skipping 46 matching lines @@
       layer_mask_back_link_(NULL),
       zoom_(1),
       zoom_inset_(0),
       delegate_(NULL),
       owner_(NULL),
       cc_layer_(NULL),
       device_scale_factor_(1.0f) {
   CreateCcLayer();
 }
 
+Layer::Layer(const Layer& layer)
+    : Layer(layer.type_) {
+  SetVisible(layer.GetTargetVisibility());
+  SetOpacity(layer.GetTargetOpacity());
+  SetBounds(layer.bounds_);
+  SetMasksToBounds(layer.GetMasksToBounds());
+  set_name(layer.name_);
+  SetFillsBoundsOpaquely(layer.fills_bounds_opaquely_);
+  SetFillsBoundsCompletely(layer.fills_bounds_completely_);
+  SetSubpixelPositionOffset(layer.subpixel_position_offset_);
+  SetLayerInverted(layer.layer_inverted_);
+  SetTransform(layer.GetTargetTransform());
+  if (layer.type_ == LAYER_SOLID_COLOR)
+    SetColor(layer.GetTargetColor());
+  if (SkRegion* alpha_shape = layer.alpha_shape())
+    SetAlphaShape(base::MakeUnique<SkRegion>(*alpha_shape));
+
+  const cc::SurfaceLayer* const surface = layer.surface_layer_.get();
+  if (surface && !surface->surface_id().is_null()) {
+    SetShowSurface(
+        surface->surface_id(),
+        surface->satisfy_callback(), surface->require_callback(),
+        surface->surface_size(), surface->surface_scale(),
+        layer.frame_size_in_dip_);
+  }
+}
+
 Layer::~Layer() {
+  for (auto* mirror : mirrors_)
+    mirror->RemoveObserver(this);
+
   FOR_EACH_OBSERVER(LayerObserver, observer_list_, LayerDestroyed(this));
 
   // Destroying the animator may cause observers to use the layer (and
   // indirectly the WebLayer). Destroy the animator first so that the WebLayer
   // is still around.
   SetAnimator(nullptr);
   if (compositor_)
     compositor_->SetRootLayer(NULL);
   if (parent_)
     parent_->Remove(this);
@@ skipping 476 matching lines @@
 
   scoped_refptr<cc::SurfaceLayer> new_layer =
       cc::SurfaceLayer::Create(satisfy_callback, require_callback);
   new_layer->SetSurfaceId(surface_id, scale, surface_size);
   SwitchToLayer(new_layer);
   surface_layer_ = new_layer;
 
   frame_size_in_dip_ = frame_size_in_dip;
   RecomputeDrawsContentAndUVRect();
 
-  FOR_EACH_OBSERVER(LayerObserver, observer_list_, SurfaceChanged(this));
+  for (auto* mirror : mirrors_) {
+    mirror->SetShowSurface(surface_id, satisfy_callback, require_callback,
+                           surface_size, scale, frame_size_in_dip);
+  }
+}
+
+std::unique_ptr<Layer> Layer::Mirror() {
+  std::unique_ptr<Layer> mirror(new Layer(*this));
+  mirror->AddObserver(this);
+  mirrors_.push_back(mirror.get());
+  return mirror;
 }
 
 void Layer::SetShowSolidColorContent() {
   DCHECK_EQ(type_, LAYER_SOLID_COLOR);
 
   if (solid_color_layer_.get())
     return;
 
   scoped_refptr<cc::SolidColorLayer> new_layer = cc::SolidColorLayer::Create();
   SwitchToLayer(new_layer);
@@ skipping 36 matching lines @@
   nine_patch_layer_->SetBorder(border);
 }
 
 void Layer::UpdateNinePatchOcclusion(const gfx::Rect& occlusion) {
   DCHECK(type_ == LAYER_NINE_PATCH && nine_patch_layer_.get());
   nine_patch_layer_->SetLayerOcclusion(occlusion);
 }
 
 void Layer::SetColor(SkColor color) { GetAnimator()->SetColor(color); }
 
-SkColor Layer::GetTargetColor() {
-  if (GetAnimator()->IsAnimatingProperty(LayerAnimationElement::COLOR))
-    return GetAnimator()->GetTargetColor();
+SkColor Layer::GetTargetColor() const {
+  if (animator_.get() && animator_->IsAnimatingProperty(
+      LayerAnimationElement::COLOR))
+    return animator_->GetTargetColor();
   return cc_layer_->background_color();
 }
 
 SkColor Layer::background_color() const {
   return cc_layer_->background_color();
 }
 
 bool Layer::SchedulePaint(const gfx::Rect& invalid_rect) {
   if ((type_ == LAYER_SOLID_COLOR && !texture_layer_.get()) ||
       type_ == LAYER_NINE_PATCH || (!delegate_ && !mailbox_.IsValid()))
@@ skipping 242 matching lines @@
 
   if (bounds.size() == old_bounds.size()) {
     // Don't schedule a draw if we're invisible. We'll schedule one
     // automatically when we get visible.
     if (IsDrawn())
       ScheduleDraw();
   } else {
     // Always schedule a paint, even if we're invisible.
     SchedulePaint(gfx::Rect(bounds.size()));
   }
+
+  if (sync_bounds_) {
+    for (auto* mirror : mirrors_)
+      mirror->SetBounds(bounds);

[sky, 2016/10/13 19:21:33]

I don't think it's always the case that the mirror wants the same bounds as the
original. For example, in alt-tab I don't think it wants the bounds mirrored.

[Dominik Laskowski, 2016/10/13 22:19:39]

Good point. I've added an option to disable bounds syncing in MirrorLayers.

+  }
 }
 
 void Layer::SetTransformFromAnimation(const gfx::Transform& transform) {
   cc_layer_->SetTransform(transform);
 }
 
 void Layer::SetOpacityFromAnimation(float opacity) {
   cc_layer_->SetOpacity(opacity);
   ScheduleDraw();
 }
@@ skipping 69 matching lines @@
 
 cc::Layer* Layer::GetCcLayer() const {
   return cc_layer_;
 }
 
 LayerThreadedAnimationDelegate* Layer::GetThreadedAnimationDelegate() {
   DCHECK(animator_);
   return animator_.get();
 }
 
+void Layer::LayerDestroyed(Layer* mirror) {
+  const auto it = std::find(mirrors_.begin(), mirrors_.end(), mirror);

[sky, 2016/10/13 19:21:33]

mirror->RemoveObserver(this).

[Dominik Laskowski, 2016/10/13 22:19:39]

The caller is the destructor of |mirror|, so that'd be redundant.

+  DCHECK(it != mirrors_.end());
+  mirrors_.erase(it);
+}
+
 void Layer::CreateCcLayer() {
   if (type_ == LAYER_SOLID_COLOR) {
     solid_color_layer_ = cc::SolidColorLayer::Create();
     cc_layer_ = solid_color_layer_.get();
   } else if (type_ == LAYER_NINE_PATCH) {
     nine_patch_layer_ = cc::NinePatchLayer::Create();
     cc_layer_ = nine_patch_layer_.get();
   } else {
     content_layer_ = cc::PictureLayer::Create(this);
     cc_layer_ = content_layer_.get();
@@ skipping 52 matching lines @@
   if (animator_) {
     animator_->DetachLayerAndTimeline(compositor);
     animator_->RemoveFromCollection(collection);
   }
 
   for (auto* child : children_)
     child->ResetCompositorForAnimatorsInTree(compositor);
 }
 
 }  // namespace ui