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 "include/core/SkData.h"
9#include "include/core/SkStream.h"
10#include "src/core/SkFontDescriptor.h"
11
12enum {
13 kInvalid = 0x00,
14
15 // these must match the sfnt 'name' enums
16 kFontFamilyName = 0x01,
17 kFullName = 0x04,
18 kPostscriptName = 0x06,
19
20 // These count backwards from 0xFF, so as not to collide with the SFNT
21 // defines for names in its 'name' table.
22 kFontAxes = 0xFB,
23 kFontAxes_bad = 0xFC, // Broken negative axes, remove when MIN_PICTURE_VERSION > 62.
24 kFontIndex = 0xFD,
25 kSentinel = 0xFF,
26};
27
28SkFontDescriptor::SkFontDescriptor() { }
29
30static bool SK_WARN_UNUSED_RESULT read_string(SkStream* stream, SkString* string) {
31 size_t length;
32 if (!stream->readPackedUInt(&length)) { return false; }
33 if (length > 0) {
34 string->resize(length);
35 if (stream->read(string->writable_str(), length) != length) { return false; }
36 }
37 return true;
38}
39
40static bool write_string(SkWStream* stream, const SkString& string, uint32_t id) {
41 if (string.isEmpty()) { return true; }
42 return stream->writePackedUInt(id) &&
43 stream->writePackedUInt(string.size()) &&
44 stream->write(string.c_str(), string.size());
45}
46
47static bool write_uint(SkWStream* stream, size_t n, uint32_t id) {
48 return stream->writePackedUInt(id) &&
49 stream->writePackedUInt(n);
50}
51
52static size_t SK_WARN_UNUSED_RESULT read_id(SkStream* stream) {
53 size_t i;
54 if (!stream->readPackedUInt(&i)) { return kInvalid; }
55 return i;
56}
57
58bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) {
59 size_t styleBits;
60 if (!stream->readPackedUInt(&styleBits)) { return false; }
61 result->fStyle = SkFontStyle((styleBits >> 16) & 0xFFFF,
62 (styleBits >> 8 ) & 0xFF,
63 static_cast<SkFontStyle::Slant>(styleBits & 0xFF));
64
65 SkAutoSTMalloc<4, SkFixed> axis;
66 size_t axisCount = 0;
67 size_t index = 0;
68 for (size_t id; (id = read_id(stream)) != kSentinel;) {
69 switch (id) {
70 case kFontFamilyName:
71 if (!read_string(stream, &result->fFamilyName)) { return false; }
72 break;
73 case kFullName:
74 if (!read_string(stream, &result->fFullName)) { return false; }
75 break;
76 case kPostscriptName:
77 if (!read_string(stream, &result->fPostscriptName)) { return false; }
78 break;
79 case kFontAxes:
80 if (!stream->readPackedUInt(&axisCount)) { return false; }
81 axis.reset(axisCount);
82 for (size_t i = 0; i < axisCount; ++i) {
83 if (!stream->readS32(&axis[i])) { return false; }
84 }
85 break;
86 case kFontAxes_bad:
87 if (!stream->readPackedUInt(&axisCount)) { return false; }
88 axis.reset(axisCount);
89 for (size_t i = 0; i < axisCount; ++i) {
90 size_t packedAxis;
91 if (!stream->readPackedUInt(&packedAxis)) { return false; }
92 axis[i] = packedAxis;
93 }
94 break;
95 case kFontIndex:
96 if (!stream->readPackedUInt(&index)) { return false; }
97 break;
98 default:
99 SkDEBUGFAIL("Unknown id used by a font descriptor");
100 return false;
101 }
102 }
103
104 size_t length;
105 if (!stream->readPackedUInt(&length)) { return false; }
106 if (length > 0) {
107 sk_sp<SkData> data(SkData::MakeUninitialized(length));
108 if (stream->read(data->writable_data(), length) != length) {
109 SkDEBUGFAIL("Could not read font data");
110 return false;
111 }
112 result->fFontData = std::make_unique<SkFontData>(
113 SkMemoryStream::Make(std::move(data)), index, axis, axisCount);
114 }
115 return true;
116}
117
118void SkFontDescriptor::serialize(SkWStream* stream) const {
119 uint32_t styleBits = (fStyle.weight() << 16) | (fStyle.width() << 8) | (fStyle.slant());
120 stream->writePackedUInt(styleBits);
121
122 write_string(stream, fFamilyName, kFontFamilyName);
123 write_string(stream, fFullName, kFullName);
124 write_string(stream, fPostscriptName, kPostscriptName);
125 if (fFontData.get()) {
126 if (fFontData->getIndex()) {
127 write_uint(stream, fFontData->getIndex(), kFontIndex);
128 }
129 if (fFontData->getAxisCount()) {
130 write_uint(stream, fFontData->getAxisCount(), kFontAxes);
131 for (int i = 0; i < fFontData->getAxisCount(); ++i) {
132 stream->write32(fFontData->getAxis()[i]);
133 }
134 }
135 }
136
137 stream->writePackedUInt(kSentinel);
138
139 if (fFontData.get() && fFontData->hasStream()) {
140 std::unique_ptr<SkStreamAsset> fontStream = fFontData->detachStream();
141 size_t length = fontStream->getLength();
142 stream->writePackedUInt(length);
143 stream->writeStream(fontStream.get(), length);
144 } else {
145 stream->writePackedUInt(0);
146 }
147}
148