gfx/2d/SFNTData.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_gfx_SFNTData_h
   8 #define mozilla_gfx_SFNTData_h
   9
  10 #include "mozilla/UniquePtr.h"
  11 #include "mozilla/Vector.h"
  12
  13 namespace mozilla {
  14 namespace gfx {
  15
  16 class SFNTData final {
  17  public:
  18   /**
  19    * Creates an SFNTData if the header is a format that we understand and
  20    * aDataLength is sufficient for the length information in the header data.
  21    * Note that the data is NOT copied, so must exist the SFNTData's lifetime.
  22    *
  23    * @param aFontData the SFNT data.
  24    * @param aDataLength length
  25    * @return UniquePtr to a SFNTData or nullptr if the header is invalid.
  26    */
  27   static UniquePtr<SFNTData> Create(const uint8_t* aFontData,
  28                                     uint32_t aDataLength);
  29
  30   /**
  31    * Creates a unique key for the given font data and variation settings.
  32    *
  33    * @param aFontData the SFNT data
  34    * @param aDataLength length
  35    * @return unique key to be used for caching
  36    */
  37   static uint64_t GetUniqueKey(const uint8_t* aFontData, uint32_t aDataLength,
  38                                uint32_t aVarDataSize, const void* aVarData);
  39
  40   ~SFNTData();
  41
  42  private:
  43   SFNTData() = default;
  44
  45   bool AddFont(const uint8_t* aFontData, uint32_t aDataLength,
  46                uint32_t aOffset);
  47
  48   uint32_t HashHeadAndCmapTables();
  49
  50   // Internal representation of single font in font file.
  51   class Font;
  52
  53   Vector<Font*> mFonts;
  54 };
  55
  56 }  // namespace gfx
  57 }  // namespace mozilla
  58
  59 #endif  // mozilla_gfx_SFNTData_h