Connect Sky and Ganesh in SkyShell

sky/shell/ui/animator.cc

+// Copyright 2015 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 "sky/shell/ui/animator.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+
+namespace sky {
+namespace shell {
+
+Animator::Animator(const Engine::Config& config, Engine* engine)
+    : config_(config),
+      engine_(engine),
+      frame_requested_(false),
+      frame_pending_(false),
+      weak_factory_(this) {
+}
+
+Animator::~Animator() {
+}
+
+void Animator::RequestFrame() {
+  if (frame_requested_)
+    return;
+  frame_requested_ = true;
+
+  if (!frame_pending_) {
+    frame_pending_ = true;
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&Animator::BeginFrame, weak_factory_.GetWeakPtr()));
+  }
+}
+
+void Animator::BeginFrame() {
+  DCHECK(frame_pending_);
+  DCHECK(frame_requested_);
+  frame_requested_ = false;
+
+  engine_->BeginFrame(base::TimeTicks::Now());
+  config_.gpu_task_runner->PostTaskAndReply(
+      FROM_HERE,
+      base::Bind(&GPUDelegate::Draw, config_.gpu_delegate, engine_->Paint()),
+      base::Bind(&Animator::OnFrameComplete, weak_factory_.GetWeakPtr()));
+}
+
+void Animator::OnFrameComplete() {
+  DCHECK(frame_pending_);
+  frame_pending_ = false;
+  if (frame_requested_) {
+    frame_pending_ = true;
+    BeginFrame();
+  }
+}
+
+}  // namespace shell
+}  // namespace sky