content: Move Surfaces related code out of RWHVA.

ui/android/delegated_frame_host_android.cc

Index: ui/android/delegated_frame_host_android.cc
diff --git a/ui/android/delegated_frame_host_android.cc b/ui/android/delegated_frame_host_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c7e5d64965d38418807988239829047616879c89
--- /dev/null
+++ b/ui/android/delegated_frame_host_android.cc
@@ -0,0 +1,190 @@
+// Copyright 2016 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/android/delegated_frame_host_android.h"
+
+#include "base/logging.h"
+#include "cc/layers/solid_color_layer.h"
+#include "cc/layers/surface_layer.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/copy_output_request.h"
+#include "cc/surfaces/surface.h"
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surface_id_allocator.h"
+#include "cc/surfaces/surface_manager.h"
+#include "ui/android/context_provider_factory.h"
+#include "ui/android/view_android.h"
+
+namespace ui {
+
+namespace {
+
+void SatisfyCallback(cc::SurfaceManager* manager,
+                     const cc::SurfaceSequence& sequence) {
+  std::vector<uint32_t> sequences;
+  sequences.push_back(sequence.sequence);
+  manager->DidSatisfySequences(sequence.client_id, &sequences);
+}
+
+void RequireCallback(cc::SurfaceManager* manager,
+                     const cc::SurfaceId& id,
+                     const cc::SurfaceSequence& sequence) {
+  cc::Surface* surface = manager->GetSurfaceForId(id);
+  if (!surface) {
+    LOG(ERROR) << "Attempting to require callback on nonexistent surface";
+    return;
+  }
+  surface->AddDestructionDependency(sequence);
+}
+
+}  // namespace
+
+DelegatedFrameHostAndroid::DelegatedFrameHostAndroid(
+    ui::ViewAndroid* view,
+    SkColor background_color,
+    ReturnResourcesCallback return_resources_callback)
+    : view_(view),
+      return_resources_callback_(return_resources_callback),
+      background_layer_(cc::SolidColorLayer::Create()) {
+  DCHECK(view_);
+  DCHECK(!return_resources_callback_.is_null());
+
+  surface_manager_ =
+      ui::ContextProviderFactory::GetInstance()->GetSurfaceManager();
+  surface_id_allocator_.reset(new cc::SurfaceIdAllocator(
+      ui::ContextProviderFactory::GetInstance()->AllocateSurfaceClientId()));
+  surface_manager_->RegisterSurfaceClientId(surface_id_allocator_->client_id());
+
+  background_layer_->SetBackgroundColor(background_color);
+  view_->GetLayer()->AddChild(background_layer_);
+  UpdateBackgroundLayer();
+}
+
+DelegatedFrameHostAndroid::~DelegatedFrameHostAndroid() {
+  DestroyDelegatedContent();
+  surface_factory_.reset();
+  surface_manager_->InvalidateSurfaceClientId(
+      surface_id_allocator_->client_id());
+  background_layer_->RemoveFromParent();
+}
+
+void DelegatedFrameHostAndroid::SubmitCompositorFrame(
+    cc::CompositorFrame frame,
+    cc::SurfaceFactory::DrawCallback draw_callback) {
+  if (!surface_factory_) {
+    surface_factory_ =
+        base::WrapUnique(new cc::SurfaceFactory(surface_manager_, this));
+  }
+
+  cc::RenderPass* root_pass =
+      frame.delegated_frame_data->render_pass_list.back().get();
+  gfx::Size texture_size_in_layer = root_pass->output_rect.size();

[no sievers, 2016/08/12 19:33:04]

nit: This name is a bit of an artifact. You can probably call it |surface_size|.

[Khushal, 2016/08/16 01:34:23]

Done.

+
+  if (surface_id_.is_null() || texture_size_in_layer != current_surface_size_ ||
+      location_bar_content_translation_ !=
+          frame.metadata.location_bar_content_translation ||
+      current_viewport_selection_ != frame.metadata.selection) {
+    DestroyDelegatedContent();
+    DCHECK(!content_layer_);
+    DCHECK(surface_id_.is_null());
+
+    surface_id_ = surface_id_allocator_->GenerateId();
+    surface_factory_->Create(surface_id_);
+
+    current_surface_size_ = texture_size_in_layer;
+    location_bar_content_translation_ =
+        frame.metadata.location_bar_content_translation;
+    current_viewport_selection_ = frame.metadata.selection;
+    CreateContentLayer();
+  }
+
+  surface_factory_->SubmitCompositorFrame(surface_id_, std::move(frame),
+                                          draw_callback);
+}
+
+uint32_t DelegatedFrameHostAndroid::GetSurfaceClientId() const {
+  return surface_id_allocator_->client_id();
+}
+
+void DelegatedFrameHostAndroid::RequestCopyOfSurface(
+    std::unique_ptr<cc::CopyOutputRequest> copy_output_request) {
+  DCHECK(!surface_id_.is_null());
+  surface_factory_->RequestCopyOfSurface(surface_id_,
+                                         std::move(copy_output_request));
+}
+
+void DelegatedFrameHostAndroid::DestroyDelegatedContent() {
+  if (surface_id_.is_null())
+    return;
+
+  DCHECK(surface_factory_.get());
+  DCHECK(content_layer_);
+
+  content_layer_->RemoveFromParent();
+  content_layer_ = nullptr;
+  surface_factory_->Destroy(surface_id_);
+  surface_id_ = cc::SurfaceId();
+
+  UpdateBackgroundLayer();
+}
+
+void DelegatedFrameHostAndroid::OutputSurfaceChanged() {
+  DestroyDelegatedContent();
+  surface_factory_.reset();
+}
+
+void DelegatedFrameHostAndroid::UpdateBackgroundColor(SkColor color) {
+  background_layer_->SetBackgroundColor(color);
+}
+
+void DelegatedFrameHostAndroid::UpdateSize(
+    const gfx::Size& desired_content_size) {
+  desired_content_size_ = desired_content_size;
+  background_layer_->SetBounds(desired_content_size);
+  UpdateBackgroundLayer();
+}
+
+cc::Layer* DelegatedFrameHostAndroid::GetContentLayer() const {
+  return content_layer_.get();
+}
+
+void DelegatedFrameHostAndroid::ReturnResources(
+    const cc::ReturnedResourceArray& resources) {
+  return_resources_callback_.Run(resources);
+}
+
+void DelegatedFrameHostAndroid::SetBeginFrameSource(
+    cc::BeginFrameSource* begin_frame_source) {
+  // TODO(tansell): Hook this up.
+}
+
+void DelegatedFrameHostAndroid::CreateContentLayer() {
+  DCHECK(!content_layer_);
+
+  // manager must outlive compositors using it.
+  content_layer_ = cc::SurfaceLayer::Create(
+      base::Bind(&SatisfyCallback, base::Unretained(surface_manager_)),
+      base::Bind(&RequireCallback, base::Unretained(surface_manager_)));
+  content_layer_->SetSurfaceId(surface_id_, 1.f, current_surface_size_);
+  content_layer_->SetBounds(current_surface_size_);
+  content_layer_->SetIsDrawable(true);
+  content_layer_->SetContentsOpaque(true);
+
+  view_->GetLayer()->AddChild(content_layer_);
+
+  UpdateBackgroundLayer();
+}
+
+void DelegatedFrameHostAndroid::UpdateBackgroundLayer() {
+  // The background layer draws in 2 cases:
+  // 1) When we don't have any content from the renderer.
+  // 2) When the bounds of the content received from the renderer does not match
+  // the desired content bounds.
+  bool background_is_drawable =
+      content_layer_.get() == nullptr ||
+      content_layer_->bounds() != desired_content_size_;

[no sievers, 2016/08/12 19:33:04]

See other comment about dip vs. pix.

Also, this would probably make the layer drawable while the omnibox is
animating. Maybe we just need to compare the |actual drawing surface size +
omnibox height (=content translation| to the total container view size in pix
without adjust for the translation offset?

Also not sure about when the keyboard is up and how that actually works.

[Khushal, 2016/08/16 01:34:23]

Thanks for pointing that out.
Done. Took care of the offset for the top controls.
The keyboard resizes the android view right now, so that should work correctly.
I think someone was planning to make a change to fix that, and have the keyboard
overlay on the content area.

+  background_layer_->SetIsDrawable(background_is_drawable);
+}
+
+}  // namespace ui