gpu: reference target surfaces through a globally unique surface id.

content/browser/gpu/gpu_surface_tracker.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 "content/browser/gpu/gpu_surface_tracker.h"
+
+#include "base/logging.h"
+
+GpuSurfaceTracker::GpuSurfaceTracker()
+    : next_surface_id_(1) {
+}
+
+GpuSurfaceTracker::~GpuSurfaceTracker() {
+}
+
+GpuSurfaceTracker* GpuSurfaceTracker::GetInstance() {
+  return Singleton<GpuSurfaceTracker>::get();
+}
+
+int GpuSurfaceTracker::AddSurfaceForRenderer(int renderer_id,
+                                             int render_widget_id) {
+  base::AutoLock lock(lock_);
+  SurfaceInfo info = { renderer_id, render_widget_id, gfx::kNullPluginWindow };
+  int surface_id = next_surface_id_++;
+  surface_map_[surface_id] = info;
+  return surface_id;
+}
+
+int GpuSurfaceTracker::LookupSurfaceForRenderer(int renderer_id,
+                                                int render_widget_id) {
+  base::AutoLock lock(lock_);
+  for (SurfaceMap::iterator it = surface_map_.begin(); it != surface_map_.end();
+       ++it) {
+    const SurfaceInfo& info = it->second;
+    if (info.renderer_id == renderer_id &&
+        info.render_widget_id == render_widget_id) {
+      return it->first;
+    }
+  }
+  return 0;
+}
+
+void GpuSurfaceTracker::RemoveSurface(int surface_id) {
+  base::AutoLock lock(lock_);
+  DCHECK(surface_map_.find(surface_id) != surface_map_.end());
+  surface_map_.erase(surface_id);
+}
+
+bool GpuSurfaceTracker::GetRenderWidgetIDForSurface(int surface_id,
+                                                    int* renderer_id,
+                                                    int* render_widget_id) {
+  base::AutoLock lock(lock_);
+  SurfaceMap::iterator it = surface_map_.find(surface_id);
+  if (it == surface_map_.end())
+    return false;
+  const SurfaceInfo& info = it->second;
+  *renderer_id = info.renderer_id;
+  *render_widget_id = info.render_widget_id;
+  return true;
+}
+
+void GpuSurfaceTracker::SetSurfaceHandle(int surface_id,
+                                         gfx::PluginWindowHandle handle) {
+  base::AutoLock lock(lock_);
+  DCHECK(surface_map_.find(surface_id) != surface_map_.end());
+  SurfaceInfo& info = surface_map_[surface_id];
+  info.handle = handle;
+}
+
+gfx::PluginWindowHandle GpuSurfaceTracker::GetSurfaceHandle(int surface_id) {
+  base::AutoLock lock(lock_);
+  DCHECK(surface_map_.find(surface_id) != surface_map_.end());
+  return surface_map_[surface_id].handle;
+}
+