chrome/browser/resources_util.cc

   1 // Copyright 2012 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/resources_util.h"
   6
   7 #include <stddef.h>
   8
   9 #include <utility>
  10
  11 #include "base/containers/flat_map.h"
  12 #include "base/no_destructor.h"
  13 #include "build/build_config.h"
  14 #include "build/chromeos_buildflags.h"
  15 #include "chrome/grit/theme_resources_map.h"
  16 #include "components/grit/components_scaled_resources_map.h"
  17 #include "ui/resources/grit/ui_resources_map.h"
  18
  19 #if BUILDFLAG(IS_CHROMEOS_ASH)
  20 #include "ui/chromeos/resources/grit/ui_chromeos_resources_map.h"
  21 #endif
  22
  23 namespace {
  24
  25 // A wrapper class that holds a map between resource strings and resource
  26 // ids.  This is done so we can use base::NoDestructor which takes care of
  27 // thread safety in initializing the map for us.
  28 class ThemeMap {
  29  public:
  30   using StringIntMap = base::flat_map<std::string, int>;
  31
  32   ThemeMap() {
  33     size_t storage_size =
  34         kComponentsScaledResourcesSize + kThemeResourcesSize + kUiResourcesSize;
  35 #if BUILDFLAG(IS_CHROMEOS_ASH)
  36     storage_size += kUiChromeosResourcesSize;
  37 #endif
  38
  39     // Construct in one-shot from a moved vector.
  40     std::vector<StringIntMap::value_type> storage;
  41     storage.reserve(storage_size);
  42
  43     for (size_t i = 0; i < kComponentsScaledResourcesSize; ++i) {
  44       storage.emplace_back(kComponentsScaledResources[i].path,
  45                            kComponentsScaledResources[i].id);
  46     }
  47     for (size_t i = 0; i < kThemeResourcesSize; ++i) {
  48       storage.emplace_back(kThemeResources[i].path, kThemeResources[i].id);
  49     }
  50     for (size_t i = 0; i < kUiResourcesSize; ++i) {
  51       storage.emplace_back(kUiResources[i].path, kUiResources[i].id);
  52     }
  53 #if BUILDFLAG(IS_CHROMEOS_ASH)
  54     for (size_t i = 0; i < kUiChromeosResourcesSize; ++i) {
  55       storage.emplace_back(kUiChromeosResources[i].path,
  56                            kUiChromeosResources[i].id);
  57     }
  58 #endif
  59
  60     id_map_ = StringIntMap(std::move(storage));
  61   }
  62
  63   int GetId(const std::string& resource_name) const {
  64     auto it = id_map_.find(resource_name);
  65     return it != id_map_.end() ? it->second : -1;
  66   }
  67
  68  private:
  69   StringIntMap id_map_;
  70 };
  71
  72 ThemeMap& GetThemeIdsMap() {
  73   static base::NoDestructor<ThemeMap> s;
  74   return *s;
  75 }
  76
  77 }  // namespace
  78
  79 int ResourcesUtil::GetThemeResourceId(const std::string& resource_name) {
  80   return GetThemeIdsMap().GetId(resource_name);
  81 }