aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/SkFontDescriptor.cpp
blob: 73ea2058ce79c618022334b970b6d702035e3f67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkFontDescriptor.h"
#include "SkMakeUnique.h"
#include "SkStream.h"
#include "SkData.h"

enum {
    // these must match the sfnt 'name' enums
    kFontFamilyName = 0x01,
    kFullName       = 0x04,
    kPostscriptName = 0x06,

    // These count backwards from 0xFF, so as not to collide with the SFNT
    // defines for names in its 'name' table.
    kFontAxes       = 0xFC,
    kFontIndex      = 0xFD,
    kFontFileName   = 0xFE,  // Remove when MIN_PICTURE_VERSION > 41
    kSentinel       = 0xFF,
};

SkFontDescriptor::SkFontDescriptor() { }

static void read_string(SkStream* stream, SkString* string) {
    const uint32_t length = SkToU32(stream->readPackedUInt());
    if (length > 0) {
        string->resize(length);
        stream->read(string->writable_str(), length);
    }
}

// Remove when MIN_PICTURE_VERSION > 41
static void skip_string(SkStream* stream) {
    const uint32_t length = SkToU32(stream->readPackedUInt());
    if (length > 0) {
        stream->skip(length);
    }
}

static void write_string(SkWStream* stream, const SkString& string, uint32_t id) {
    if (!string.isEmpty()) {
        stream->writePackedUInt(id);
        stream->writePackedUInt(string.size());
        stream->write(string.c_str(), string.size());
    }
}

static size_t read_uint(SkStream* stream) {
    return stream->readPackedUInt();
}

static void write_uint(SkWStream* stream, size_t n, uint32_t id) {
    stream->writePackedUInt(id);
    stream->writePackedUInt(n);
}

bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) {
    size_t styleBits = stream->readPackedUInt();
    if (styleBits <= 2) {
        // Remove this branch when MIN_PICTURE_VERSION > 45
        result->fStyle = SkFontStyle::FromOldStyle(styleBits);
    } else {
        result->fStyle = SkFontStyle((styleBits >> 16) & 0xFFFF,
                                     (styleBits >> 8 ) & 0xFF,
                                     static_cast<SkFontStyle::Slant>(styleBits & 0xFF));
    }

    SkAutoSTMalloc<4, SkFixed> axis;
    size_t axisCount = 0;
    size_t index = 0;
    for (size_t id; (id = stream->readPackedUInt()) != kSentinel;) {
        switch (id) {
            case kFontFamilyName:
                read_string(stream, &result->fFamilyName);
                break;
            case kFullName:
                read_string(stream, &result->fFullName);
                break;
            case kPostscriptName:
                read_string(stream, &result->fPostscriptName);
                break;
            case kFontAxes:
                axisCount = read_uint(stream);
                axis.reset(axisCount);
                for (size_t i = 0; i < axisCount; ++i) {
                    axis[i] = read_uint(stream);
                }
                break;
            case kFontIndex:
                index = read_uint(stream);
                break;
            case kFontFileName:  // Remove when MIN_PICTURE_VERSION > 41
                skip_string(stream);
                break;
            default:
                SkDEBUGFAIL("Unknown id used by a font descriptor");
                return false;
        }
    }

    size_t length = stream->readPackedUInt();
    if (length > 0) {
        sk_sp<SkData> data(SkData::MakeUninitialized(length));
        if (stream->read(data->writable_data(), length) == length) {
            result->fFontData = skstd::make_unique<SkFontData>(
                skstd::make_unique<SkMemoryStream>(data), index, axis, axisCount);
        } else {
            SkDEBUGFAIL("Could not read font data");
            return false;
        }
    }
    return true;
}

void SkFontDescriptor::serialize(SkWStream* stream) {
    uint32_t styleBits = (fStyle.weight() << 16) | (fStyle.width() << 8) | (fStyle.slant());
    stream->writePackedUInt(styleBits);

    write_string(stream, fFamilyName, kFontFamilyName);
    write_string(stream, fFullName, kFullName);
    write_string(stream, fPostscriptName, kPostscriptName);
    if (fFontData.get()) {
        if (fFontData->getIndex()) {
            write_uint(stream, fFontData->getIndex(), kFontIndex);
        }
        if (fFontData->getAxisCount()) {
            write_uint(stream, fFontData->getAxisCount(), kFontAxes);
            for (int i = 0; i < fFontData->getAxisCount(); ++i) {
                stream->writePackedUInt(fFontData->getAxis()[i]);
            }
        }
    }

    stream->writePackedUInt(kSentinel);

    if (fFontData.get() && fFontData->hasStream()) {
        std::unique_ptr<SkStreamAsset> fontStream = fFontData->detachStream();
        size_t length = fontStream->getLength();
        stream->writePackedUInt(length);
        stream->writeStream(fontStream.get(), length);
    } else {
        stream->writePackedUInt(0);
    }
}