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
12 enum {
13 kInvalid = 0x00,
14
15 // Related to a font request.
16 kFontFamilyName = 0x01, // int length, data[length]
17 kFullName = 0x04, // int length, data[length]
18 kPostscriptName = 0x06, // int length, data[length]
19 kWeight = 0x10, // scalar (1 - 1000)
20 kWidth = 0x11, // scalar (percentage, 100 is 'normal')
21 kSlant = 0x12, // scalar (cw angle, 14 is a normal right leaning oblique)
22 kItalic = 0x13, // scalar (0 is Roman, 1 is fully Italic)
23
24 // Related to font data. Can also be used with a requested font.
25 kPaletteIndex = 0xF8, // int
26 kPaletteEntryOverrides = 0xF9, // int count, (int, u32)[count]
27 kFontVariation = 0xFA, // int count, (u32, scalar)[count]
28
29 // Related to font data.
30 kFontIndex = 0xFD, // int
31 kSentinel = 0xFF, // no data
32 };
33
SkFontDescriptor()34 SkFontDescriptor::SkFontDescriptor() { }
35
read_string(SkStream * stream,SkString * string)36 static bool SK_WARN_UNUSED_RESULT read_string(SkStream* stream, SkString* string) {
37 size_t length;
38 if (!stream->readPackedUInt(&length)) { return false; }
39 if (length > 0) {
40 string->resize(length);
41 if (stream->read(string->writable_str(), length) != length) { return false; }
42 }
43 return true;
44 }
45
write_string(SkWStream * stream,const SkString & string,uint32_t id)46 static bool write_string(SkWStream* stream, const SkString& string, uint32_t id) {
47 if (string.isEmpty()) { return true; }
48 return stream->writePackedUInt(id) &&
49 stream->writePackedUInt(string.size()) &&
50 stream->write(string.c_str(), string.size());
51 }
52
write_uint(SkWStream * stream,size_t n,uint32_t id)53 static bool write_uint(SkWStream* stream, size_t n, uint32_t id) {
54 return stream->writePackedUInt(id) &&
55 stream->writePackedUInt(n);
56 }
57
write_scalar(SkWStream * stream,SkScalar n,uint32_t id)58 static bool write_scalar(SkWStream* stream, SkScalar n, uint32_t id) {
59 return stream->writePackedUInt(id) &&
60 stream->writeScalar(n);
61 }
62
read_id(SkStream * stream)63 static size_t SK_WARN_UNUSED_RESULT read_id(SkStream* stream) {
64 size_t i;
65 if (!stream->readPackedUInt(&i)) { return kInvalid; }
66 return i;
67 }
68
69 static constexpr SkScalar usWidths[9] {
70 1, 2, 3, 4, 5, 6, 7, 8, 9
71 };
72 static constexpr SkScalar width_for_usWidth[0x10] = {
73 50,
74 50, 62.5, 75, 87.5, 100, 112.5, 125, 150, 200,
75 200, 200, 200, 200, 200, 200
76 };
77
Deserialize(SkStream * stream,SkFontDescriptor * result)78 bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) {
79 size_t coordinateCount;
80 using CoordinateCountType = decltype(result->fCoordinateCount);
81
82 size_t index;
83 using CollectionIndexType = decltype(result->fCollectionIndex);
84
85 size_t paletteIndex;
86 using PaletteIndexType = decltype(result->fPaletteIndex);
87
88 size_t paletteEntryOverrideCount;
89 using PaletteEntryOverrideCountType = decltype(result->fPaletteEntryOverrideCount);
90
91 size_t paletteEntryOverrideIndex;
92 using PaletteEntryOverrideIndexType = decltype(result->fPaletteEntryOverrides[0].index);
93
94 SkScalar weight = SkFontStyle::kNormal_Weight;
95 SkScalar width = SkFontStyle::kNormal_Width;
96 SkScalar slant = 0;
97 SkScalar italic = 0;
98
99 size_t styleBits;
100 if (!stream->readPackedUInt(&styleBits)) { return false; }
101 weight = ((styleBits >> 16) & 0xFFFF);
102 width = ((styleBits >> 8) & 0x000F)[width_for_usWidth];
103 slant = ((styleBits >> 0) & 0x000F) != SkFontStyle::kUpright_Slant ? 14 : 0;
104 italic = ((styleBits >> 0) & 0x000F) == SkFontStyle::kItalic_Slant ? 1 : 0;
105
106 for (size_t id; (id = read_id(stream)) != kSentinel;) {
107 switch (id) {
108 case kFontFamilyName:
109 if (!read_string(stream, &result->fFamilyName)) { return false; }
110 break;
111 case kFullName:
112 if (!read_string(stream, &result->fFullName)) { return false; }
113 break;
114 case kPostscriptName:
115 if (!read_string(stream, &result->fPostscriptName)) { return false; }
116 break;
117 case kWeight:
118 if (!stream->readScalar(&weight)) { return false; }
119 break;
120 case kWidth:
121 if (!stream->readScalar(&width)) { return false; }
122 break;
123 case kSlant:
124 if (!stream->readScalar(&slant)) { return false; }
125 break;
126 case kItalic:
127 if (!stream->readScalar(&italic)) { return false; }
128 break;
129 case kFontVariation:
130 if (!stream->readPackedUInt(&coordinateCount)) { return false; }
131 if (!SkTFitsIn<CoordinateCountType>(coordinateCount)) { return false; }
132 result->fCoordinateCount = SkTo<CoordinateCountType>(coordinateCount);
133
134 result->fVariation.reset(coordinateCount);
135 for (size_t i = 0; i < coordinateCount; ++i) {
136 if (!stream->readU32(&result->fVariation[i].axis)) { return false; }
137 if (!stream->readScalar(&result->fVariation[i].value)) { return false; }
138 }
139 break;
140 case kFontIndex:
141 if (!stream->readPackedUInt(&index)) { return false; }
142 if (!SkTFitsIn<CollectionIndexType>(index)) { return false; }
143 result->fCollectionIndex = SkTo<CollectionIndexType>(index);
144 break;
145 case kPaletteIndex:
146 if (!stream->readPackedUInt(&paletteIndex)) { return false; }
147 if (!SkTFitsIn<PaletteIndexType>(paletteIndex)) { return false; }
148 result->fPaletteIndex = SkTo<PaletteIndexType>(paletteIndex);
149 break;
150 case kPaletteEntryOverrides:
151 if (!stream->readPackedUInt(&paletteEntryOverrideCount)) { return false; }
152 if (!SkTFitsIn<PaletteEntryOverrideCountType>(paletteEntryOverrideCount)) {
153 return false;
154 }
155 result->fPaletteEntryOverrideCount =
156 SkTo<PaletteEntryOverrideCountType>(paletteEntryOverrideCount);
157
158 result->fPaletteEntryOverrides.reset(paletteEntryOverrideCount);
159 for (size_t i = 0; i < paletteEntryOverrideCount; ++i) {
160 if (!stream->readPackedUInt(&paletteEntryOverrideIndex)) { return false; }
161 if (!SkTFitsIn<PaletteEntryOverrideIndexType>(paletteEntryOverrideIndex)) {
162 return false;
163 }
164 result->fPaletteEntryOverrides[i].index =
165 SkTo<PaletteEntryOverrideIndexType>(paletteEntryOverrideIndex);
166 if (!stream->readU32(&result->fPaletteEntryOverrides[i].color)) {
167 return false;
168 }
169 }
170 break;
171 default:
172 SkDEBUGFAIL("Unknown id used by a font descriptor");
173 return false;
174 }
175 }
176
177 SkFontStyle::Slant slantEnum = SkFontStyle::kUpright_Slant;
178 if (slant != 0) { slantEnum = SkFontStyle::kOblique_Slant; }
179 if (0 < italic) { slantEnum = SkFontStyle::kItalic_Slant; }
180 SkFontStyle::Width widthEnum = SkFontStyleWidthForWidthAxisValue(width);
181 result->fStyle = SkFontStyle(SkScalarRoundToInt(weight), widthEnum, slantEnum);
182
183 size_t length;
184 if (!stream->readPackedUInt(&length)) { return false; }
185 if (length > 0) {
186 sk_sp<SkData> data(SkData::MakeUninitialized(length));
187 if (stream->read(data->writable_data(), length) != length) {
188 SkDEBUGFAIL("Could not read font data");
189 return false;
190 }
191 result->fStream = SkMemoryStream::Make(std::move(data));
192 }
193 return true;
194 }
195
serialize(SkWStream * stream) const196 void SkFontDescriptor::serialize(SkWStream* stream) const {
197 uint32_t styleBits = (fStyle.weight() << 16) | (fStyle.width() << 8) | (fStyle.slant());
198 stream->writePackedUInt(styleBits);
199
200 write_string(stream, fFamilyName, kFontFamilyName);
201 write_string(stream, fFullName, kFullName);
202 write_string(stream, fPostscriptName, kPostscriptName);
203
204 write_scalar(stream, fStyle.weight(), kWeight);
205 write_scalar(stream, fStyle.width()[width_for_usWidth], kWidth);
206 write_scalar(stream, fStyle.slant() == SkFontStyle::kUpright_Slant ? 0 : 14, kSlant);
207 write_scalar(stream, fStyle.slant() == SkFontStyle::kItalic_Slant ? 1 : 0, kItalic);
208
209 if (fCollectionIndex) {
210 write_uint(stream, fCollectionIndex, kFontIndex);
211 }
212 if (fPaletteIndex) {
213 write_uint(stream, fPaletteIndex, kPaletteIndex);
214 }
215 if (fCoordinateCount) {
216 write_uint(stream, fCoordinateCount, kFontVariation);
217 for (int i = 0; i < fCoordinateCount; ++i) {
218 stream->write32(fVariation[i].axis);
219 stream->writeScalar(fVariation[i].value);
220 }
221 }
222 if (fPaletteEntryOverrideCount) {
223 write_uint(stream, fPaletteEntryOverrideCount, kPaletteEntryOverrides);
224 for (int i = 0; i < fPaletteEntryOverrideCount; ++i) {
225 stream->writePackedUInt(fPaletteEntryOverrides[i].index);
226 stream->write32(fPaletteEntryOverrides[i].color);
227 }
228 }
229
230 stream->writePackedUInt(kSentinel);
231
232 if (fStream) {
233 std::unique_ptr<SkStreamAsset> fontStream = fStream->duplicate();
234 size_t length = fontStream->getLength();
235 stream->writePackedUInt(length);
236 stream->writeStream(fontStream.get(), length);
237 } else {
238 stream->writePackedUInt(0);
239 }
240 }
241
SkFontStyleWidthForWidthAxisValue(SkScalar width)242 SkFontStyle::Width SkFontDescriptor::SkFontStyleWidthForWidthAxisValue(SkScalar width) {
243 int usWidth = SkScalarRoundToInt(SkScalarInterpFunc(width, &width_for_usWidth[1], usWidths, 9));
244 return static_cast<SkFontStyle::Width>(usWidth);
245 }
246