Select theme resources from ResourceBundle at requested scale factor.

ui/base/resource/data_pack.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/base/resource/data_pack.h"
 
 #include <errno.h>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 43 matching lines @@
   HEADER_TRUNCATED,
   WRONG_ENCODING,
 
   LOAD_ERRORS_COUNT,
 };
 
 }  // namespace
 
 namespace ui {
 
-DataPack::DataPack(float scale_factor)
+DataPack::DataPack(ui::ScaleFactor scale_factor)
     : resource_count_(0),
       text_encoding_type_(BINARY),
       scale_factor_(scale_factor) {
 }
 
 DataPack::~DataPack() {
 }
 
 bool DataPack::Load(const FilePath& path) {
   mmap_.reset(new file_util::MemoryMappedFile);
@@ skipping 63 matching lines @@
       UMA_HISTOGRAM_ENUMERATION("DataPack.Load", ENTRY_NOT_FOUND,
                                 LOAD_ERRORS_COUNT);
       mmap_.reset();
       return false;
     }
   }
 
   return true;
 }
 
+bool DataPack::HasResource(uint16 resource_id) const {
+  return !!bsearch(&resource_id, mmap_->data() + kHeaderLength, resource_count_,
+                   sizeof(DataPackEntry), DataPackEntry::CompareById);
+}
+
 bool DataPack::GetStringPiece(uint16 resource_id,
                               base::StringPiece* data) const {
   // It won't be hard to make this endian-agnostic, but it's not worth
   // bothering to do right now.
 #if defined(__BYTE_ORDER)
   // Linux check
   COMPILE_ASSERT(__BYTE_ORDER == __LITTLE_ENDIAN,
                  datapack_assumes_little_endian);
 #elif defined(__BIG_ENDIAN__)
   // Mac check
@@ skipping 21 matching lines @@
     return NULL;
 
   return new base::RefCountedStaticMemory(
       reinterpret_cast<const unsigned char*>(piece.data()), piece.length());
 }
 
 ResourceHandle::TextEncodingType DataPack::GetTextEncodingType() const {
   return text_encoding_type_;
 }
 
-float DataPack::GetScaleFactor() const {
+ui::ScaleFactor DataPack::GetScaleFactor() const {
   return scale_factor_;
 }
 
 // static
 bool DataPack::WritePack(const FilePath& path,
                          const std::map<uint16, base::StringPiece>& resources,
                          TextEncodingType textEncodingType) {
   FILE* file = file_util::OpenFile(path, "wb");
   if (!file)
     return false;
@@ skipping 75 matching lines @@
       return false;
     }
   }
 
   file_util::CloseFile(file);
 
   return true;
 }
 
 }  // namespace ui