1 /* 2 * Copyright 2011 Google Inc. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_ 18 #define SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_ 19 20 #include <vector> 21 22 #include "sfntly/port/refcount.h" 23 #include "sfntly/port/type.h" 24 #include "sfntly/font.h" 25 26 namespace sfntly { 27 28 class FontFactory : public RefCounted<FontFactory> { 29 public: 30 virtual ~FontFactory(); 31 32 // Factory method for the construction of a font factory. 33 static CALLER_ATTACH FontFactory* GetInstance(); 34 35 // Toggle whether fonts that are loaded are fingerprinted with a SHA-1 hash. 36 // If a font is fingerprinted then a SHA-1 hash is generated at load time and 37 // stored in the font. This is useful for uniquely identifying fonts. By 38 // default this is turned on. 39 // @param fingerprint whether fingerprinting should be turned on or off 40 // TODO(arthurhsu): IMPLEMENT: C++ port currently don't do any SHA-1 41 void FingerprintFont(bool fingerprint); 42 bool FingerprintFont(); 43 44 // Load the font(s) from the input stream. The current settings on the factory 45 // are used during the loading process. One or more fonts are returned if the 46 // stream contains valid font data. Some font container formats may have more 47 // than one font and in this case multiple font objects will be returned. If 48 // the data in the stream cannot be parsed or is invalid an array of size zero 49 // will be returned. 50 void LoadFonts(InputStream* is, FontArray* output); 51 52 // ByteArray font loading 53 // Load the font(s) from the byte array. The current settings on the factory 54 // are used during the loading process. One or more fonts are returned if the 55 // stream contains valid font data. Some font container formats may have more 56 // than one font and in this case multiple font objects will be returned. If 57 // the data in the stream cannot be parsed or is invalid an array of size zero 58 // will be returned. 59 void LoadFonts(ByteVector* b, FontArray* output); 60 61 // Load the font(s) from the input stream into font builders. The current 62 // settings on the factory are used during the loading process. One or more 63 // font builders are returned if the stream contains valid font data. Some 64 // font container formats may have more than one font and in this case 65 // multiple font builder objects will be returned. If the data in the stream 66 // cannot be parsed or is invalid an array of size zero will be returned. 67 void LoadFontsForBuilding(InputStream* is, FontBuilderArray* output); 68 69 // Load the font(s) from the byte array into font builders. The current 70 // settings on the factory are used during the loading process. One or more 71 // font builders are returned if the stream contains valid font data. Some 72 // font container formats may have more than one font and in this case 73 // multiple font builder objects will be returned. If the data in the stream 74 // cannot be parsed or is invalid an array of size zero will be returned. 75 void LoadFontsForBuilding(ByteVector* b, FontBuilderArray* output); 76 77 // Font serialization 78 // Serialize the font to the output stream. 79 // NOTE: in this port we attempted not to implement I/O stream because dealing 80 // with cross-platform I/O stream itself is big enough as a project. 81 // Byte buffer it is. 82 void SerializeFont(Font* font, OutputStream* os); 83 84 // Set the table ordering to be used in serializing a font. The table ordering 85 // is an ordered list of table ids and tables will be serialized in the order 86 // given. Any tables whose id is not listed in the ordering will be placed in 87 // an unspecified order following those listed. 88 void SetSerializationTableOrdering(const IntegerList& table_ordering); 89 90 // Get an empty font builder for creating a new font from scratch. 91 CALLER_ATTACH Font::Builder* NewFontBuilder(); 92 93 private: 94 // Offsets to specific elements in the underlying data. These offsets are 95 // relative to the start of the table or the start of sub-blocks within the 96 // table. 97 struct Offset { 98 enum { 99 // Offsets within the main directory. 100 kTTCTag = 0, 101 kVersion = 4, 102 kNumFonts = 8, 103 kOffsetTable = 12, 104 105 // TTC Version 2.0 extensions. 106 // Offsets from end of OffsetTable. 107 kulDsigTag = 0, 108 kulDsigLength = 4, 109 kulDsigOffset = 8 110 }; 111 }; 112 113 FontFactory(); 114 115 CALLER_ATTACH Font* LoadSingleOTF(InputStream* is); 116 CALLER_ATTACH Font* LoadSingleOTF(WritableFontData* wfd); 117 118 void LoadCollection(InputStream* is, FontArray* output); 119 void LoadCollection(WritableFontData* wfd, FontArray* output); 120 121 CALLER_ATTACH Font::Builder* LoadSingleOTFForBuilding(InputStream* is); 122 CALLER_ATTACH Font::Builder* 123 LoadSingleOTFForBuilding(WritableFontData* wfd, 124 int32_t offset_to_offset_table); 125 126 void LoadCollectionForBuilding(InputStream* is, FontBuilderArray* builders); 127 void LoadCollectionForBuilding(WritableFontData* ba, 128 FontBuilderArray* builders); 129 130 static bool IsCollection(PushbackInputStream* pbis); 131 static bool IsCollection(ReadableFontData* wfd); 132 133 bool fingerprint_; 134 IntegerList table_ordering_; 135 }; 136 typedef Ptr<FontFactory> FontFactoryPtr; 137 138 } // namespace sfntly 139 140 #endif // SFNTLY_CPP_SRC_SFNTLY_FONT_FACTORY_H_ 141
