1 /* 2 * Copyright 2013 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 "SkAdvancedTypefaceMetrics.h" 9 #include "SkData.h" 10 #include "SkFixed.h" 11 #include "SkFontMgr.h" 12 #include "SkMakeUnique.h" 13 #include "SkOTTable_OS_2.h" 14 #include "SkSFNTHeader.h" 15 #include "SkStream.h" 16 #include "SkRefCnt.h" 17 #include "SkTypeface.h" 18 #include "SkTypefaceCache.h" 19 #include "Resources.h" 20 #include "Test.h" 21 22 #include <memory> 23 24 static void TypefaceStyle_test(skiatest::Reporter* reporter, 25 uint16_t weight, uint16_t width, SkData* data) 26 { 27 sk_sp<SkData> dataCopy; 28 if (!data->unique()) { 29 dataCopy = SkData::MakeWithCopy(data->data(), data->size()); 30 data = dataCopy.get(); 31 } 32 SkSFNTHeader* sfntHeader = static_cast<SkSFNTHeader*>(data->writable_data()); 33 34 SkSFNTHeader::TableDirectoryEntry* tableEntry = 35 SkTAfter<SkSFNTHeader::TableDirectoryEntry>(sfntHeader); 36 SkSFNTHeader::TableDirectoryEntry* os2TableEntry = nullptr; 37 int numTables = SkEndian_SwapBE16(sfntHeader->numTables); 38 for (int tableEntryIndex = 0; tableEntryIndex < numTables; ++tableEntryIndex) { 39 if (SkOTTableOS2::TAG == tableEntry[tableEntryIndex].tag) { 40 os2TableEntry = tableEntry + tableEntryIndex; 41 break; 42 } 43 } 44 SkASSERT_RELEASE(os2TableEntry); 45 46 size_t os2TableOffset = SkEndian_SwapBE32(os2TableEntry->offset); 47 SkOTTableOS2_V0* os2Table = SkTAddOffset<SkOTTableOS2_V0>(sfntHeader, os2TableOffset); 48 os2Table->usWeightClass.value = SkEndian_SwapBE16(weight); 49 using WidthType = SkOTTableOS2_V0::WidthClass::Value; 50 os2Table->usWidthClass.value = static_cast<WidthType>(SkEndian_SwapBE16(width)); 51 52 sk_sp<SkTypeface> newTypeface(SkTypeface::MakeFromStream(new SkMemoryStream(sk_ref_sp(data)))); 53 if (!newTypeface) { 54 // Not all SkFontMgr can MakeFromStream(). 55 return; 56 } 57 58 SkFontStyle newStyle = newTypeface->fontStyle(); 59 60 //printf("%d, %f\n", weight, (newStyle.weight() - (float)0x7FFF) / (float)0x7FFF); 61 //printf("%d, %f\n", width , (newStyle.width() - (float)0x7F) / (float)0x7F); 62 //printf("%d, %d\n", weight, newStyle.weight()); 63 //printf("%d, %d\n", width , newStyle.width()); 64 65 // Some back-ends (CG, GDI, DW) support OS/2 version A which uses 0 - 10 (but all differently). 66 REPORTER_ASSERT(reporter, 67 newStyle.weight() == weight || 68 (weight <= 10 && newStyle.weight() == 100 * weight) || 69 (weight == 4 && newStyle.weight() == 350) || // GDI weirdness 70 (weight == 5 && newStyle.weight() == 400) || // GDI weirdness 71 (weight == 0 && newStyle.weight() == 1) || // DW weirdness 72 (weight == 1000 && newStyle.weight() == 999) // DW weirdness 73 ); 74 75 // Some back-ends (GDI) don't support width, ensure these always report 'medium'. 76 REPORTER_ASSERT(reporter, 77 newStyle.width() == width || 78 newStyle.width() == 5); 79 } 80 DEF_TEST(TypefaceStyle, reporter) { 81 std::unique_ptr<SkStreamAsset> stream(GetResourceAsStream("fonts/Em.ttf")); 82 if (!stream) { 83 REPORT_FAILURE(reporter, "fonts/Em.ttf", SkString("Cannot load resource")); 84 return; 85 } 86 sk_sp<SkData> data(SkData::MakeFromStream(stream.get(), stream->getLength())); 87 88 using SkFS = SkFontStyle; 89 for (int weight = SkFS::kInvisible_Weight; weight <= SkFS::kExtraBlack_Weight; ++weight) { 90 TypefaceStyle_test(reporter, weight, 5, data.get()); 91 } 92 for (int width = SkFS::kUltraCondensed_Width; width <= SkFS::kUltraExpanded_Width; ++width) { 93 TypefaceStyle_test(reporter, 400, width, data.get()); 94 } 95 } 96 97 DEF_TEST(TypefaceAxes, reporter) { 98 std::unique_ptr<SkStreamAsset> distortable(GetResourceAsStream("fonts/Distortable.ttf")); 99 if (!distortable) { 100 REPORT_FAILURE(reporter, "distortable", SkString()); 101 return; 102 } 103 constexpr int numberOfAxesInDistortable = 1; 104 105 sk_sp<SkFontMgr> fm = SkFontMgr::RefDefault(); 106 // The position may be over specified. If there are multiple values for a given axis, 107 // ensure the last one since that's what css-fonts-4 requires. 108 const SkFontArguments::VariationPosition::Coordinate position[] = { 109 { SkSetFourByteTag('w','g','h','t'), 1.618033988749895f }, 110 { SkSetFourByteTag('w','g','h','t'), SK_ScalarSqrt2 }, 111 }; 112 SkFontArguments params; 113 params.setVariationDesignPosition({position, SK_ARRAY_COUNT(position)}); 114 // TODO: if axes are set and the back-end doesn't support them, should we create the typeface? 115 sk_sp<SkTypeface> typeface = fm->makeFromStream(std::move(distortable), params); 116 117 if (!typeface) { 118 // Not all SkFontMgr can makeFromStream(). 119 return; 120 } 121 122 int count = typeface->getVariationDesignPosition(nullptr, 0); 123 if (count == -1) { 124 return; 125 } 126 REPORTER_ASSERT(reporter, count == numberOfAxesInDistortable); 127 128 SkFontArguments::VariationPosition::Coordinate positionRead[numberOfAxesInDistortable]; 129 count = typeface->getVariationDesignPosition(positionRead, SK_ARRAY_COUNT(positionRead)); 130 REPORTER_ASSERT(reporter, count == SK_ARRAY_COUNT(positionRead)); 131 132 REPORTER_ASSERT(reporter, positionRead[0].axis == position[1].axis); 133 134 // Convert to fixed for "almost equal". 135 SkFixed fixedRead = SkScalarToFixed(positionRead[0].value); 136 SkFixed fixedOriginal = SkScalarToFixed(position[1].value); 137 REPORTER_ASSERT(reporter, fixedRead == fixedOriginal); 138 } 139 140 DEF_TEST(TypefaceVariationIndex, reporter) { 141 std::unique_ptr<SkStreamAsset> distortable(GetResourceAsStream("fonts/Distortable.ttf")); 142 if (!distortable) { 143 REPORT_FAILURE(reporter, "distortable", SkString()); 144 return; 145 } 146 147 sk_sp<SkFontMgr> fm = SkFontMgr::RefDefault(); 148 SkFontArguments params; 149 // The first named variation position in Distortable is 'Thin'. 150 params.setCollectionIndex(0x00010000); 151 sk_sp<SkTypeface> typeface = fm->makeFromStream(std::move(distortable), params); 152 if (!typeface) { 153 // FreeType is the only weird thing that supports this, Skia just needs to make sure if it 154 // gets one of these things make sense. 155 return; 156 } 157 158 int count = typeface->getVariationDesignPosition(nullptr, 0); 159 if (!(count == 1)) { 160 REPORT_FAILURE(reporter, "count == 1", SkString()); 161 return; 162 } 163 164 SkFontArguments::VariationPosition::Coordinate positionRead[1]; 165 count = typeface->getVariationDesignPosition(positionRead, SK_ARRAY_COUNT(positionRead)); 166 if (count == -1) { 167 return; 168 } 169 if (!(count == 1)) { 170 REPORT_FAILURE(reporter, "count == 1", SkString()); 171 return; 172 } 173 REPORTER_ASSERT(reporter, positionRead[0].axis == SkSetFourByteTag('w','g','h','t')); 174 REPORTER_ASSERT(reporter, positionRead[0].value == 0.5); 175 } 176 177 DEF_TEST(Typeface, reporter) { 178 179 sk_sp<SkTypeface> t1(SkTypeface::MakeFromName(nullptr, SkFontStyle())); 180 sk_sp<SkTypeface> t2(SkTypeface::MakeDefault()); 181 182 REPORTER_ASSERT(reporter, SkTypeface::Equal(t1.get(), t2.get())); 183 REPORTER_ASSERT(reporter, SkTypeface::Equal(nullptr, t1.get())); 184 REPORTER_ASSERT(reporter, SkTypeface::Equal(nullptr, t2.get())); 185 REPORTER_ASSERT(reporter, SkTypeface::Equal(t1.get(), nullptr)); 186 REPORTER_ASSERT(reporter, SkTypeface::Equal(t2.get(), nullptr)); 187 } 188 189 namespace { 190 191 class SkEmptyTypeface : public SkTypeface { 192 public: 193 static sk_sp<SkTypeface> Create() { return sk_sp<SkTypeface>(new SkEmptyTypeface()); } 194 protected: 195 SkEmptyTypeface() : SkTypeface(SkFontStyle(), true) { } 196 197 SkStreamAsset* onOpenStream(int* ttcIndex) const override { return nullptr; } 198 SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&, 199 const SkDescriptor*) const override { 200 return nullptr; 201 } 202 void onFilterRec(SkScalerContextRec*) const override { } 203 std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override { 204 return nullptr; 205 } 206 void onGetFontDescriptor(SkFontDescriptor*, bool*) const override { } 207 virtual int onCharsToGlyphs(const void* chars, Encoding encoding, 208 uint16_t glyphs[], int glyphCount) const override { 209 SK_ABORT("unimplemented"); 210 return 0; 211 } 212 int onCountGlyphs() const override { return 0; } 213 int onGetUPEM() const override { return 0; } 214 void onGetFamilyName(SkString* familyName) const override { familyName->reset(); } 215 SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override { 216 SK_ABORT("unimplemented"); 217 return nullptr; 218 } 219 int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[], 220 int coordinateCount) const override 221 { 222 return 0; 223 } 224 int onGetTableTags(SkFontTableTag tags[]) const override { return 0; } 225 size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const override { return 0; } 226 }; 227 228 } 229 230 static bool count_proc(SkTypeface* face, void* ctx) { 231 int* count = static_cast<int*>(ctx); 232 *count = *count + 1; 233 return false; 234 } 235 static int count(skiatest::Reporter* reporter, const SkTypefaceCache& cache) { 236 int count = 0; 237 SkTypeface* none = cache.findByProcAndRef(count_proc, &count); 238 REPORTER_ASSERT(reporter, none == nullptr); 239 return count; 240 } 241 242 DEF_TEST(TypefaceCache, reporter) { 243 sk_sp<SkTypeface> t1(SkEmptyTypeface::Create()); 244 { 245 SkTypefaceCache cache; 246 REPORTER_ASSERT(reporter, count(reporter, cache) == 0); 247 { 248 sk_sp<SkTypeface> t0(SkEmptyTypeface::Create()); 249 cache.add(t0.get()); 250 REPORTER_ASSERT(reporter, count(reporter, cache) == 1); 251 cache.add(t1.get()); 252 REPORTER_ASSERT(reporter, count(reporter, cache) == 2); 253 cache.purgeAll(); 254 REPORTER_ASSERT(reporter, count(reporter, cache) == 2); 255 } 256 REPORTER_ASSERT(reporter, count(reporter, cache) == 2); 257 cache.purgeAll(); 258 REPORTER_ASSERT(reporter, count(reporter, cache) == 1); 259 } 260 REPORTER_ASSERT(reporter, t1->unique()); 261 } 262
