SFNTData.h (1758B)
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