skia/ext/SkFontHost_fontconfig_direct.h

   1 /* libs/graphics/ports/SkFontHost_fontconfig_direct.h
   2 **
   3 ** Copyright 2009, Google Inc.
   4 **
   5 ** Licensed under the Apache License, Version 2.0 (the "License");
   6 ** you may not use this file except in compliance with the License.
   7 ** You may obtain a copy of the License at
   8 **
   9 **     http://www.apache.org/licenses/LICENSE-2.0
  10 **
  11 ** Unless required by applicable law or agreed to in writing, software
  12 ** distributed under the License is distributed on an "AS IS" BASIS,
  13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 ** See the License for the specific language governing permissions and
  15 ** limitations under the License.
  16 */
  17
  18 #ifndef FontConfigDirect_DEFINED
  19 #define FontConfigDirect_DEFINED
  20 #pragma once
  21
  22 #include <map>
  23 #include <string>
  24
  25 #include "base/compiler_specific.h"
  26 #include "SkThread.h"
  27 #include "SkFontHost_fontconfig_impl.h"
  28
  29 class SK_API FontConfigDirect : public FontConfigInterface {
  30  public:
  31   FontConfigDirect();
  32   virtual ~FontConfigDirect();
  33
  34   // FontConfigInterface implementation. Thread safe.
  35   virtual bool Match(std::string* result_family, unsigned* result_filefaceid,
  36                      bool filefaceid_valid, unsigned filefaceid,
  37                      const std::string& family,
  38                      const void* characters, size_t characters_bytes,
  39                      bool* is_bold, bool* is_italic) OVERRIDE;
  40   virtual int Open(unsigned filefaceid) OVERRIDE;
  41
  42  private:
  43   SkMutex mutex_;
  44   // fileid stored in two maps below are unique per font file.
  45   std::map<unsigned, std::string> fileid_to_filename_;
  46   std::map<std::string, unsigned> filename_to_fileid_;
  47
  48   // Cache of |family,style| to |FontMatch| to minimize querying FontConfig.
  49   typedef std::pair<std::string, int> FontMatchKey;
  50   struct FontMatch {
  51     std::string family;
  52     bool is_bold;
  53     bool is_italic;
  54     unsigned filefaceid;
  55   };
  56   std::map<FontMatchKey, FontMatch> font_match_cache_;
  57
  58   unsigned next_file_id_;
  59 };
  60
  61 #endif  // FontConfigDirect_DEFINED