Initial checkin of the new Mozart compositor.

services/gfx/compositor/renderer_state.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 "services/gfx/compositor/renderer_state.h"
+
+#include <sstream>
+
+#include "base/logging.h"
+
+namespace compositor {
+
+RendererState::RendererState(uint32_t id, const std::string& label)
+    : id_(id), label_(label), weak_factory_(this) {}
+
+RendererState::~RendererState() {}
+
+bool RendererState::SetRootScene(SceneState* scene,
+                                 uint32_t version,
+                                 const mojo::Rect& viewport) {
+  DCHECK(scene);
+  DCHECK(version);
+
+  if (root_scene_ != scene || root_scene_version_ != version ||
+      !root_scene_viewport_.Equals(viewport)) {
+    root_scene_ = scene;
+    root_scene_version_ = version;
+    root_scene_viewport_ = viewport;
+    SetSnapshot(nullptr);
+    return true;
+  }
+  return false;
+}
+
+bool RendererState::SetSnapshot(std::unique_ptr<Snapshot> snapshot) {
+  snapshot_ = std::move(snapshot);
+  if (snapshot_ && snapshot_->valid()) {
+    frame_ = snapshot_->frame();
+    DCHECK(frame_);
+    return true;
+  }
+  return false;
+}
+
+std::string RendererState::FormattedLabel() {
+  if (formatted_label_cache_.empty()) {
+    std::ostringstream s;
+    s << "<" << id_;
+    if (!label_.empty())
+      s << ":" << label_;
+    s << ">";
+    formatted_label_cache_ = s.str();
+  }
+  return formatted_label_cache_;
+}
+
+std::ostream& operator<<(std::ostream& os, RendererState* renderer_state) {
+  if (!renderer_state)
+    return os << "null";
+  return os << renderer_state->FormattedLabel();
+}
+
+}  // namespace compositor