gfx/ui/color_profile: add color profile cache on win

ui/gfx/color_profile_win.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 "ui/gfx/color_profile.h"
 
+#include <map>
 #include <windows.h>
 
 #include "base/file_util.h"
+#include "base/lazy_instance.h"
+#include "base/synchronization/lock.h"
 
 namespace gfx {
 
+class ColorProfileCache {
+ public:
+  // A thread-safe cache of color profiles keyed by windows device name.
+  ColorProfileCache() {}
+
+  bool Find(const std::wstring& device, std::vector<char>* profile) {
+    base::AutoLock lock(lock_);
+    DeviceColorProfile::const_iterator it = cache_.find(device);
+    if (it == cache_.end())
+      return false;
+    *profile = it->second;
+    return true;
+  }
+
+  void Insert(const std::wstring& device, const std::vector<char>& profile) {
+    base::AutoLock lock(lock_);
+    cache_[device] = profile;
+  }
+
+  bool Erase(const std::wstring& device) {
+    base::AutoLock lock(lock_);
+    DeviceColorProfile::iterator it = cache_.find(device);
+    if (it == cache_.end())
+      return false;
+    cache_.erase(device);
+    return true;
+  }
+
+  void Clear() {
+    base::AutoLock lock(lock_);
+    cache_.clear();
+  }
+
+ private:
+  typedef std::map<std::wstring, std::vector<char> > DeviceColorProfile;
+
+  DeviceColorProfile cache_;
+  base::Lock lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(ColorProfileCache);
+};
+
 bool GetDisplayColorProfile(const gfx::Rect& bounds,
                             std::vector<char>* profile) {
   if (bounds.IsEmpty())
     return false;
   // TODO(noel): implement.
   return false;
 }
 
 void ReadColorProfile(std::vector<char>* profile) {
   // TODO: support multiple monitors.
   HDC screen_dc = GetDC(NULL);
   DWORD path_len = MAX_PATH;
   WCHAR path[MAX_PATH + 1];
 
   BOOL result = GetICMProfile(screen_dc, &path_len, path);
   ReleaseDC(NULL, screen_dc);
   if (!result)
     return;
   std::string profileData;
   if (!base::ReadFileToString(base::FilePath(path), &profileData))
     return;
   size_t length = profileData.size();
   if (gfx::InvalidColorProfileLength(length))
     return;
   profile->assign(profileData.data(), profileData.data() + length);
 }
 
 }  // namespace gfx