UI Resource Manager

cc/resources/scoped_ui_resource.cc

+// Copyright 2013 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 "cc/resources/scoped_ui_resource.h"
+
+#include "base/basictypes.h"
+#include "base/bind.h"
+#include "cc/trees/layer_tree_host.h"
+
+namespace cc {
+
+ScopedUIResource::ScopedUIResource(LayerTreeHost* host,
+                                   scoped_refptr<UIResourceBitmap> bitmap)
+    : id_(0),
+      bitmap_(bitmap) {
+  ResetResource(host, bitmap);
+}
+
+scoped_refptr<ScopedUIResource> ScopedUIResource::Create(
+    LayerTreeHost* host,
+    scoped_refptr<UIResourceBitmap> bitmap) {
+  return make_scoped_refptr(new ScopedUIResource(host, bitmap));
+}
+
+// ClearResource deletes the bitmap owned by this class.
+void ScopedUIResource::ClearResource() {

[aelias_OOO_until_Jul13, 2013/07/25 23:45:11]

This method is not ever safe to call on its own, you can no longer respond to a
lost context callback.  Please delete it.

[powei, 2013/07/26 23:07:27]

Done.

+  id_ = 0;
+  bitmap_ = NULL;
+}
+
+void ScopedUIResource::ResetResource(LayerTreeHost* host,
+                                     scoped_refptr<UIResourceBitmap> bitmap) {
+  // If there was already a resource, release it.
+  ReleaseResource(host);

[aelias_OOO_until_Jul13, 2013/07/25 23:45:11]

No guarantee it's the same host.

[powei, 2013/07/26 23:07:27]

Done.

+
+  bitmap_ = bitmap;
+  if (host)

[aelias_OOO_until_Jul13, 2013/07/25 23:45:11]

Replace this if with DCHECK(host);

[powei, 2013/07/26 23:07:27]

Done.

+    id_ =
+        host->CreateUIResource(base::Bind(&ScopedUIResource::GetBitmap, this));
+}
+
+// ReleaseResource deletes the UI resource allocated in the resource manager.
+void ScopedUIResource::ReleaseResource(LayerTreeHost* host) {
+  if (host && id_)
+    host->DeleteUIResource(id_);
+  ClearResource();
+}
+
+scoped_refptr<UIResourceBitmap> ScopedUIResource::GetBitmap(
+    bool resource_lost) {
+  return bitmap_;
+}
+
+}  // namespace cc