1 /*
2 * Copyright 2012 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkFontDescriptor.h"
9 #include "SkStream.h"
10 #include "SkData.h"
11
12 enum {
13 // these must match the sfnt 'name' enums
14 kFontFamilyName = 0x01,
15 kFullName = 0x04,
16 kPostscriptName = 0x06,
17
18 // These count backwards from 0xFF, so as not to collide with the SFNT
19 // defines for names in its 'name' table.
20 kFontAxes = 0xFC,
21 kFontIndex = 0xFD,
22 kFontFileName = 0xFE, // Remove when MIN_PICTURE_VERSION > 41
23 kSentinel = 0xFF,
24 };
25
SkFontDescriptor(SkTypeface::Style style)26 SkFontDescriptor::SkFontDescriptor(SkTypeface::Style style) : fStyle(style) { }
27
read_string(SkStream * stream,SkString * string)28 static void read_string(SkStream* stream, SkString* string) {
29 const uint32_t length = SkToU32(stream->readPackedUInt());
30 if (length > 0) {
31 string->resize(length);
32 stream->read(string->writable_str(), length);
33 }
34 }
35
36 // Remove when MIN_PICTURE_VERSION > 41
skip_string(SkStream * stream)37 static void skip_string(SkStream* stream) {
38 const uint32_t length = SkToU32(stream->readPackedUInt());
39 if (length > 0) {
40 stream->skip(length);
41 }
42 }
43
write_string(SkWStream * stream,const SkString & string,uint32_t id)44 static void write_string(SkWStream* stream, const SkString& string, uint32_t id) {
45 if (!string.isEmpty()) {
46 stream->writePackedUInt(id);
47 stream->writePackedUInt(string.size());
48 stream->write(string.c_str(), string.size());
49 }
50 }
51
read_uint(SkStream * stream)52 static size_t read_uint(SkStream* stream) {
53 return stream->readPackedUInt();
54 }
55
write_uint(SkWStream * stream,size_t n,uint32_t id)56 static void write_uint(SkWStream* stream, size_t n, uint32_t id) {
57 stream->writePackedUInt(id);
58 stream->writePackedUInt(n);
59 }
60
Deserialize(SkStream * stream,SkFontDescriptor * result)61 bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) {
62 result->fStyle = (SkTypeface::Style)stream->readPackedUInt();
63
64 SkAutoSTMalloc<4, SkFixed> axis;
65 size_t axisCount = 0;
66 size_t index = 0;
67 for (size_t id; (id = stream->readPackedUInt()) != kSentinel;) {
68 switch (id) {
69 case kFontFamilyName:
70 read_string(stream, &result->fFamilyName);
71 break;
72 case kFullName:
73 read_string(stream, &result->fFullName);
74 break;
75 case kPostscriptName:
76 read_string(stream, &result->fPostscriptName);
77 break;
78 case kFontAxes:
79 axisCount = read_uint(stream);
80 axis.reset(axisCount);
81 for (size_t i = 0; i < axisCount; ++i) {
82 axis[i] = read_uint(stream);
83 }
84 break;
85 case kFontIndex:
86 index = read_uint(stream);
87 break;
88 case kFontFileName: // Remove when MIN_PICTURE_VERSION > 41
89 skip_string(stream);
90 break;
91 default:
92 SkDEBUGFAIL("Unknown id used by a font descriptor");
93 return false;
94 }
95 }
96
97 size_t length = stream->readPackedUInt();
98 if (length > 0) {
99 SkAutoTUnref<SkData> data(SkData::NewUninitialized(length));
100 if (stream->read(data->writable_data(), length) == length) {
101 result->fFontData.reset(new SkFontData(new SkMemoryStream(data),
102 index, axis, axisCount));
103 } else {
104 SkDEBUGFAIL("Could not read font data");
105 return false;
106 }
107 }
108 return true;
109 }
110
serialize(SkWStream * stream)111 void SkFontDescriptor::serialize(SkWStream* stream) {
112 stream->writePackedUInt(fStyle);
113
114 write_string(stream, fFamilyName, kFontFamilyName);
115 write_string(stream, fFullName, kFullName);
116 write_string(stream, fPostscriptName, kPostscriptName);
117 if (fFontData.get()) {
118 if (fFontData->getIndex()) {
119 write_uint(stream, fFontData->getIndex(), kFontIndex);
120 }
121 if (fFontData->getAxisCount()) {
122 write_uint(stream, fFontData->getAxisCount(), kFontAxes);
123 for (int i = 0; i < fFontData->getAxisCount(); ++i) {
124 stream->writePackedUInt(fFontData->getAxis()[i]);
125 }
126 }
127 }
128
129 stream->writePackedUInt(kSentinel);
130
131 if (fFontData.get() && fFontData->hasStream()) {
132 SkAutoTDelete<SkStreamAsset> fontData(fFontData->detachStream());
133 size_t length = fontData->getLength();
134 stream->writePackedUInt(length);
135 stream->writeStream(fontData, length);
136 } else {
137 stream->writePackedUInt(0);
138 }
139 }
140