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/SkFont.h"
10 #include "include/core/SkFontStyle.h"
11 #include "include/core/SkFontTypes.h"
12 #include "include/core/SkRect.h"
13 #include "include/core/SkRefCnt.h"
14 #include "include/core/SkScalar.h"
15 #include "include/core/SkStream.h"
16 #include "include/core/SkTypeface.h"
17 #include "include/core/SkTypes.h"
18 #include "include/private/base/SkDebug.h"
19 #include "include/private/base/SkTemplates.h"
20 #include "src/base/SkAutoMalloc.h"
21 #include "src/base/SkEndian.h"
22 #include "src/core/SkFontStream.h"
23 #include "tests/Test.h"
24 #include "tools/Resources.h"
25 #include "tools/fonts/FontToolUtils.h"
26
27 #include <cstdint>
28 #include <cstring>
29 #include <memory>
30 #include <string>
31
32 using namespace skia_private;
33
34 //#define DUMP_TABLES
35 //#define DUMP_TTC_TABLES
36
37 #define kFontTableTag_head SkSetFourByteTag('h', 'e', 'a', 'd')
38 #define kFontTableTag_hhea SkSetFourByteTag('h', 'h', 'e', 'a')
39 #define kFontTableTag_maxp SkSetFourByteTag('m', 'a', 'x', 'p')
40
41 static const struct TagSize {
42 SkFontTableTag fTag;
43 size_t fSize;
44 } gKnownTableSizes[] = {
45 { kFontTableTag_head, 54 },
46 { kFontTableTag_hhea, 36 },
47 };
48
49 // Test that getUnitsPerEm() agrees with a direct lookup in the 'head' table
50 // (if that table is available).
test_unitsPerEm(skiatest::Reporter * reporter,const sk_sp<SkTypeface> & face)51 static void test_unitsPerEm(skiatest::Reporter* reporter, const sk_sp<SkTypeface>& face) {
52 int nativeUPEM = face->getUnitsPerEm();
53
54 int tableUPEM = -1;
55 size_t size = face->getTableSize(kFontTableTag_head);
56 if (size) {
57 // unitsPerEm is at offset 18 into the 'head' table.
58 uint16_t rawUPEM;
59 face->getTableData(kFontTableTag_head, 18, sizeof(rawUPEM), &rawUPEM);
60 tableUPEM = SkEndian_SwapBE16(rawUPEM);
61 }
62
63 if (tableUPEM >= 0) {
64 REPORTER_ASSERT(reporter, tableUPEM == nativeUPEM);
65 }
66 }
67
68 // Test that countGlyphs() agrees with a direct lookup in the 'maxp' table
69 // (if that table is available).
test_countGlyphs(skiatest::Reporter * reporter,const sk_sp<SkTypeface> & face)70 static void test_countGlyphs(skiatest::Reporter* reporter, const sk_sp<SkTypeface>& face) {
71 int nativeGlyphs = face->countGlyphs();
72
73 int tableGlyphs = -1;
74 size_t size = face->getTableSize(kFontTableTag_maxp);
75 if (size) {
76 // glyphs is at offset 4 into the 'maxp' table.
77 uint16_t rawGlyphs;
78 face->getTableData(kFontTableTag_maxp, 4, sizeof(rawGlyphs), &rawGlyphs);
79 tableGlyphs = SkEndian_SwapBE16(rawGlyphs);
80 }
81
82 if (tableGlyphs >= 0) {
83 REPORTER_ASSERT(reporter, tableGlyphs == nativeGlyphs);
84 }
85 }
86
test_fontstream(skiatest::Reporter * reporter,SkStream * stream,int ttcIndex)87 static void test_fontstream(skiatest::Reporter* reporter, SkStream* stream, int ttcIndex) {
88 int n = SkFontStream::GetTableTags(stream, ttcIndex, nullptr);
89 AutoTArray<SkFontTableTag> array(n);
90
91 int n2 = SkFontStream::GetTableTags(stream, ttcIndex, array.get());
92 REPORTER_ASSERT(reporter, n == n2);
93
94 for (int i = 0; i < n; ++i) {
95 #ifdef DUMP_TTC_TABLES
96 SkString str;
97 SkFontTableTag t = array[i];
98 str.appendUnichar((t >> 24) & 0xFF);
99 str.appendUnichar((t >> 16) & 0xFF);
100 str.appendUnichar((t >> 8) & 0xFF);
101 str.appendUnichar((t >> 0) & 0xFF);
102 SkDebugf("[%d:%d] '%s'\n", ttcIndex, i, str.c_str());
103 #endif
104 size_t size = SkFontStream::GetTableSize(stream, ttcIndex, array[i]);
105 for (size_t j = 0; j < std::size(gKnownTableSizes); ++j) {
106 if (gKnownTableSizes[j].fTag == array[i]) {
107 REPORTER_ASSERT(reporter, gKnownTableSizes[j].fSize == size);
108 }
109 }
110 }
111 }
112
test_fontstream(skiatest::Reporter * reporter)113 static void test_fontstream(skiatest::Reporter* reporter) {
114 std::unique_ptr<SkStreamAsset> stream(GetResourceAsStream("fonts/test.ttc"));
115 if (!stream) {
116 SkDebugf("Skipping FontHostTest::test_fontstream\n");
117 return;
118 }
119
120 int count = SkFontStream::CountTTCEntries(stream.get());
121 #ifdef DUMP_TTC_TABLES
122 SkDebugf("CountTTCEntries %d\n", count);
123 #endif
124 for (int i = 0; i < count; ++i) {
125 test_fontstream(reporter, stream.get(), i);
126 }
127 }
128
129 // Exercise this rare cmap format (platform 3, encoding 0)
test_symbolfont(skiatest::Reporter * reporter)130 static void test_symbolfont(skiatest::Reporter* reporter) {
131 auto tf = ToolUtils::CreateTypefaceFromResource("fonts/SpiderSymbol.ttf");
132 if (tf) {
133 SkUnichar c = 0xf021;
134 uint16_t g = SkFont(tf).unicharToGlyph(c);
135 REPORTER_ASSERT(reporter, g == 3);
136 } else {
137 // not all platforms support data fonts, so we just note that failure
138 SkDebugf("Skipping FontHostTest::test_symbolfont\n");
139 }
140 }
141
test_tables(skiatest::Reporter * reporter,const sk_sp<SkTypeface> & face)142 static void test_tables(skiatest::Reporter* reporter, const sk_sp<SkTypeface>& face) {
143 if ((false)) { // avoid bit rot, suppress warning
144 SkTypefaceID typefaceID = face->uniqueID();
145 REPORTER_ASSERT(reporter, typefaceID);
146 }
147
148 int count = face->countTables();
149
150 AutoTMalloc<SkFontTableTag> storage(count);
151 SkFontTableTag* tags = storage.get();
152
153 int count2 = face->getTableTags(tags);
154 REPORTER_ASSERT(reporter, count2 == count);
155
156 for (int i = 0; i < count; ++i) {
157 size_t size = face->getTableSize(tags[i]);
158 REPORTER_ASSERT(reporter, size > 0);
159
160 #ifdef DUMP_TABLES
161 char name[5];
162 name[0] = (tags[i] >> 24) & 0xFF;
163 name[1] = (tags[i] >> 16) & 0xFF;
164 name[2] = (tags[i] >> 8) & 0xFF;
165 name[3] = (tags[i] >> 0) & 0xFF;
166 name[4] = 0;
167 SkDebugf("%s %d\n", name, size);
168 #endif
169
170 for (size_t j = 0; j < std::size(gKnownTableSizes); ++j) {
171 if (gKnownTableSizes[j].fTag == tags[i]) {
172 REPORTER_ASSERT(reporter, gKnownTableSizes[j].fSize == size);
173 }
174 }
175
176 // do we get the same size from GetTableData and GetTableSize
177 {
178 SkAutoMalloc data(size);
179 size_t size2 = face->getTableData(tags[i], 0, size, data.get());
180 REPORTER_ASSERT(reporter, size2 == size);
181 sk_sp<SkData> data2 = face->copyTableData(tags[i]);
182 REPORTER_ASSERT(reporter, size == data2->size());
183 REPORTER_ASSERT(reporter, !memcmp(data.get(), data2->data(), size));
184 }
185 }
186 }
187
test_tables(skiatest::Reporter * reporter)188 static void test_tables(skiatest::Reporter* reporter) {
189 static const char* const gNames[] = {
190 nullptr, // default font
191 "Helvetica", "Arial",
192 "Times", "Times New Roman",
193 "Courier", "Courier New",
194 "Terminal", "MS Sans Serif",
195 "Hiragino Mincho ProN", "MS PGothic",
196 };
197
198 for (size_t i = 0; i < std::size(gNames); ++i) {
199 sk_sp<SkTypeface> face(ToolUtils::CreateTestTypeface(gNames[i], SkFontStyle()));
200 if (face) {
201 #ifdef DUMP_TABLES
202 SkDebugf("%s\n", gNames[i]);
203 #endif
204 test_tables(reporter, face);
205 test_unitsPerEm(reporter, face);
206 test_countGlyphs(reporter, face);
207 }
208 }
209 }
210
211 /*
212 * Verifies that the advance values returned by various methods match.
213 */
test_advances(skiatest::Reporter * reporter)214 static void test_advances(skiatest::Reporter* reporter) {
215 static const char* const faces[] = {
216 nullptr, // default font
217 "Arial", "Times", "Times New Roman", "Helvetica", "Courier",
218 "Courier New", "Verdana", "monospace",
219 };
220
221 static const struct {
222 SkFontHinting hinting;
223 bool linear;
224 bool subpixel;
225 } settings[] = {
226 { SkFontHinting::kNone, false, false },
227 { SkFontHinting::kNone, true, false },
228 { SkFontHinting::kNone, false, true },
229 { SkFontHinting::kSlight, false, false },
230 { SkFontHinting::kSlight, true, false },
231 { SkFontHinting::kSlight, false, true },
232 { SkFontHinting::kNormal, false, false },
233 { SkFontHinting::kNormal, true, false },
234 { SkFontHinting::kNormal, false, true },
235 };
236
237 static const struct {
238 SkScalar fScaleX;
239 SkScalar fSkewX;
240 } gScaleRec[] = {
241 { SK_Scalar1, 0 },
242 { SK_Scalar1/2, 0 },
243 // these two exercise obliquing (skew)
244 { SK_Scalar1, -SK_Scalar1/4 },
245 { SK_Scalar1/2, -SK_Scalar1/4 },
246 };
247
248 SkFont font;
249 char const * const txt = "long.text.with.lots.of.dots.";
250 size_t textLen = strlen(txt);
251
252 for (size_t i = 0; i < std::size(faces); i++) {
253 font.setTypeface(ToolUtils::CreateTestTypeface(faces[i], SkFontStyle()));
254
255 for (size_t j = 0; j < std::size(settings); j++) {
256 font.setHinting(settings[j].hinting);
257 font.setLinearMetrics(settings[j].linear);
258 font.setSubpixel(settings[j].subpixel);
259
260 for (size_t k = 0; k < std::size(gScaleRec); ++k) {
261 font.setScaleX(gScaleRec[k].fScaleX);
262 font.setSkewX(gScaleRec[k].fSkewX);
263
264 SkRect bounds;
265
266 SkScalar width1 = font.measureText(txt, textLen, SkTextEncoding::kUTF8);
267
268 // Requesting the bounds forces a generateMetrics call.
269 SkScalar width2 = font.measureText(txt, textLen, SkTextEncoding::kUTF8, &bounds);
270
271 REPORTER_ASSERT(reporter, width1 == width2);
272 }
273 }
274 }
275 }
276
DEF_TEST(FontHost,reporter)277 DEF_TEST(FontHost, reporter) {
278 test_tables(reporter);
279 test_fontstream(reporter);
280 test_advances(reporter);
281 test_symbolfont(reporter);
282 }
283
284 // need tests for SkStrSearch
285