tests/unittest/FontCollectionTest.cpp - platform/frameworks/minikin - Git at Google

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "minikin/FontCollection.h"

 #include <gtest/gtest.h>

 #include "FontTestUtils.h"
 #include "FreeTypeMinikinFontForTest.h"
 #include "MinikinInternal.h"

 namespace minikin {

 // The test font has following glyphs.
 // U+82A6
 // U+82A6 U+FE00 (VS1)
 // U+82A6 U+E0100 (VS17)
 // U+82A6 U+E0101 (VS18)
 // U+82A6 U+E0102 (VS19)
 // U+845B
 // U+845B U+FE01 (VS2)
 // U+845B U+E0101 (VS18)
 // U+845B U+E0102 (VS19)
 // U+845B U+E0103 (VS20)
 // U+537F
 // U+717D U+FE02 (VS3)
 // U+717D U+E0102 (VS19)
 // U+717D U+E0103 (VS20)
 const char kVsTestFont[] = "VariationSelectorTest-Regular.ttf";

 void expectVSGlyphs(const FontCollection* fc, uint32_t codepoint, const std::set<uint32_t>& vsSet) {
     for (uint32_t vs = 0xFE00; vs <= 0xE01EF; ++vs) {
         // Move to variation selectors supplements after variation selectors.
         if (vs == 0xFF00) {
             vs = 0xE0100;
         }
         if (vsSet.find(vs) == vsSet.end()) {
             EXPECT_FALSE(fc->hasVariationSelector(codepoint, vs))
                     << "Glyph for U+" << std::hex << codepoint << " U+" << vs;
         } else {
             EXPECT_TRUE(fc->hasVariationSelector(codepoint, vs))
                     << "Glyph for U+" << std::hex << codepoint << " U+" << vs;
         }
     }
 }

 void expectVSGlyphsForVsTestFont(const FontCollection* fc) {
     EXPECT_FALSE(fc->hasVariationSelector(0x82A6, 0));
     expectVSGlyphs(fc, 0x82A6, std::set<uint32_t>({0xFE00, 0xFE0E, 0xE0100, 0xE0101, 0xE0102}));

     EXPECT_FALSE(fc->hasVariationSelector(0x845B, 0));
     expectVSGlyphs(fc, 0x845B, std::set<uint32_t>({0xFE01, 0xFE0E, 0xE0101, 0xE0102, 0xE0103}));

     EXPECT_FALSE(fc->hasVariationSelector(0x537F, 0));
     expectVSGlyphs(fc, 0x537F, std::set<uint32_t>({0xFE0E}));

     EXPECT_FALSE(fc->hasVariationSelector(0x717D, 0));
     expectVSGlyphs(fc, 0x717D, std::set<uint32_t>({0xFE02, 0xE0102, 0xE0103}));
 }

 TEST(FontCollectionTest, hasVariationSelectorTest) {
     auto fc = buildFontCollection(kVsTestFont);
     expectVSGlyphsForVsTestFont(fc.get());
 }

 const char kEmojiXmlFile[] = "emoji.xml";

 TEST(FontCollectionTest, hasVariationSelectorTest_emoji) {
     auto collection = buildFontCollectionFromXml(kEmojiXmlFile);

     // Both text/color font have cmap format 14 subtable entry for VS15/VS16 respectively.
     EXPECT_TRUE(collection->hasVariationSelector(0x2623, 0xFE0E));
     EXPECT_TRUE(collection->hasVariationSelector(0x2623, 0xFE0F));

     // The text font has cmap format 14 subtable entry for VS15 but the color font doesn't have for
     // VS16
     EXPECT_TRUE(collection->hasVariationSelector(0x2626, 0xFE0E));
     EXPECT_FALSE(collection->hasVariationSelector(0x2626, 0xFE0F));

     // The color font has cmap format 14 subtable entry for VS16 but the text font doesn't have for
     // VS15.
     EXPECT_TRUE(collection->hasVariationSelector(0x262A, 0xFE0E));
     EXPECT_TRUE(collection->hasVariationSelector(0x262A, 0xFE0F));

     // Neither text/color font have cmap format 14 subtable entry for VS15/VS16.
     EXPECT_TRUE(collection->hasVariationSelector(0x262E, 0xFE0E));
     EXPECT_FALSE(collection->hasVariationSelector(0x262E, 0xFE0F));

     // Text font doesn't support U+1F3FD. Only the color emoji fonts has. So VS15 is not supported.
     EXPECT_FALSE(collection->hasVariationSelector(0x1F3FD, 0xFE0E));

     // Text font doesn't have U+262F U+FE0E or even its base code point U+262F.
     EXPECT_FALSE(collection->hasVariationSelector(0x262F, 0xFE0E));

     // None of the fonts support U+2229.
     EXPECT_FALSE(collection->hasVariationSelector(0x2229, 0xFE0E));
     EXPECT_FALSE(collection->hasVariationSelector(0x2229, 0xFE0F));
 }

 TEST(FontCollectionTest, newEmojiTest) {
     auto collection = buildFontCollectionFromXml(kEmojiXmlFile);

     // U+2695, U+2640, U+2642 are not in emoji catrgory in Unicode 9 but they are now in emoji
     // category. Should return true even if U+FE0E was appended.
     // These three emojis are only avalilable in TextEmoji.ttf but U+2695 is excluded here since it
     // is used in other tests.
     EXPECT_TRUE(collection->hasVariationSelector(0x2640, 0xFE0E));
     EXPECT_FALSE(collection->hasVariationSelector(0x2640, 0xFE0F));
     EXPECT_TRUE(collection->hasVariationSelector(0x2642, 0xFE0E));
     EXPECT_FALSE(collection->hasVariationSelector(0x2642, 0xFE0F));
 }

 TEST(FontCollectionTest, createWithVariations) {
     // This font has 'wdth' and 'wght' axes.
     const char kMultiAxisFont[] = "MultiAxis.ttf";
     const char kNoAxisFont[] = "Regular.ttf";

     std::shared_ptr<FontCollection> multiAxisFc = buildFontCollection(kMultiAxisFont);
     std::shared_ptr<FontCollection> noAxisFc = buildFontCollection(kNoAxisFont);

     {
         // Do not ceate new instance if none of variations are specified.
         EXPECT_EQ(nullptr,
                   multiAxisFc->createCollectionWithVariation(std::vector<FontVariation>()));
         EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(std::vector<FontVariation>()));
     }
     {
         // New instance should be used for supported variation.
         std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f}};
         std::shared_ptr<FontCollection> newFc(
                 multiAxisFc->createCollectionWithVariation(variations));
         EXPECT_NE(nullptr, newFc.get());
         EXPECT_NE(multiAxisFc.get(), newFc.get());

         EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
     }
     {
         // New instance should be used for supported variation (multiple variations case).
         std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f},
                                                  {MinikinFont::MakeTag('w', 'g', 'h', 't'), 1.0f}};
         std::shared_ptr<FontCollection> newFc(
                 multiAxisFc->createCollectionWithVariation(variations));
         EXPECT_NE(nullptr, newFc.get());
         EXPECT_NE(multiAxisFc.get(), newFc.get());

         EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
     }
     {
         // Do not ceate new instance if none of variations are supported.
         std::vector<FontVariation> variations = {{MinikinFont::MakeTag('Z', 'Z', 'Z', 'Z'), 1.0f}};
         EXPECT_EQ(nullptr, multiAxisFc->createCollectionWithVariation(variations));
         EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
     }
     {
         // At least one axis is supported, should create new instance.
         std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f},
                                                  {MinikinFont::MakeTag('Z', 'Z', 'Z', 'Z'), 1.0f}};
         std::shared_ptr<FontCollection> newFc(
                 multiAxisFc->createCollectionWithVariation(variations));
         EXPECT_NE(nullptr, newFc.get());
         EXPECT_NE(multiAxisFc.get(), newFc.get());

         EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
     }
 }

 std::vector<uint8_t> writeToBuffer(
         const std::vector<std::shared_ptr<FontCollection>>& collections) {
     BufferWriter fakeWriter(nullptr);
     FontCollection::writeVector<writeFreeTypeMinikinFontForTest>(&fakeWriter, collections);
     std::vector<uint8_t> buffer(fakeWriter.size());
     BufferWriter writer(buffer.data());
     FontCollection::writeVector<writeFreeTypeMinikinFontForTest>(&writer, collections);
     return buffer;
 }

 TEST(FontCollectionTest, bufferTest) {
     {
         std::vector<std::shared_ptr<FontCollection>> original({buildFontCollection(kVsTestFont)});
         std::vector<uint8_t> buffer = writeToBuffer(original);
         BufferReader reader(buffer.data());
         auto copied = FontCollection::readVector<readFreeTypeMinikinFontForTest>(&reader);
         EXPECT_EQ(1u, copied.size());
         expectVSGlyphsForVsTestFont(copied[0].get());
         EXPECT_EQ(original[0]->getSupportedTags(), copied[0]->getSupportedTags());
         // Id will be different.
         EXPECT_NE(original[0]->getId(), copied[0]->getId());
         std::vector<uint8_t> newBuffer = writeToBuffer(copied);
         EXPECT_EQ(buffer, newBuffer);
     }
     {
         // Test that FontFamily instances are shared.
         std::vector<std::shared_ptr<FontFamily>> families = {buildFontFamily(kVsTestFont)};
         auto fc1 = std::make_shared<FontCollection>(families);
         auto fc2 = std::make_shared<FontCollection>(families);
         std::vector<std::shared_ptr<FontCollection>> original({fc1, fc2});
         std::vector<uint8_t> buffer = writeToBuffer(original);
         BufferReader reader(buffer.data());
         auto copied = FontCollection::readVector<readFreeTypeMinikinFontForTest>(&reader);
         EXPECT_EQ(2u, copied.size());
         EXPECT_EQ(copied[0]->mFamilies[0], copied[1]->mFamilies[0]);
         std::vector<uint8_t> newBuffer = writeToBuffer(copied);
         EXPECT_EQ(buffer, newBuffer);
     }
     {
         // Test axes.
         // This font has 'wdth' and 'wght' axes.
         const char kMultiAxisFont[] = "MultiAxis.ttf";
         std::vector<std::shared_ptr<FontCollection>> original(
                 {buildFontCollection(kMultiAxisFont)});
         std::vector<uint8_t> buffer = writeToBuffer(original);
         BufferReader reader(buffer.data());
         auto copied = FontCollection::readVector<readFreeTypeMinikinFontForTest>(&reader);
         EXPECT_EQ(1u, copied.size());
         EXPECT_EQ(1u,
                   copied[0]->getSupportedTags().count(MinikinFont::MakeTag('w', 'd', 't', 'h')));
         EXPECT_EQ(1u,
                   copied[0]->getSupportedTags().count(MinikinFont::MakeTag('w', 'g', 'h', 't')));
         std::vector<uint8_t> newBuffer = writeToBuffer(copied);
         EXPECT_EQ(buffer, newBuffer);
     }
 }

 TEST(FontCollectionTest, FamilyMatchResultBuilderTest) {
     using Builder = FontCollection::FamilyMatchResult::Builder;
     EXPECT_TRUE(Builder().empty());
     EXPECT_EQ(0u, Builder().size());
     EXPECT_EQ(1u, Builder().add(5).size());
     EXPECT_EQ(2u, Builder().add(5).add(4).size());

     // Reset
     EXPECT_TRUE(Builder().add(5).reset().empty());
     EXPECT_EQ(0u, Builder().add(5).reset().size());
 }

 TEST(FontCollectionTest, FamilyMatchResultTest) {
     using Builder = FontCollection::FamilyMatchResult::Builder;

     auto r = Builder().build();
     EXPECT_EQ(0u, r.size());
     EXPECT_TRUE(r.empty());

     r = Builder().add(1).build();
     EXPECT_EQ(1u, r.size());
     EXPECT_FALSE(r.empty());
     EXPECT_EQ(1u, r[0]);

     r = Builder().add(1).add(2).build();
     EXPECT_EQ(2u, r.size());
     EXPECT_FALSE(r.empty());
     EXPECT_EQ(1u, r[0]);
     EXPECT_EQ(2u, r[1]);
 }

 TEST(FontCollectionTest, FamilyMatchResultTest_BuilderHoldeFirst7) {
     auto b = FontCollection::FamilyMatchResult::Builder();
     for (uint8_t i = 0; i < 128; ++i) {
         b.add(i);
     }
     auto r = b.build();
     EXPECT_EQ(7u, r.size());
     EXPECT_FALSE(r.empty());
     EXPECT_EQ(0u, r[0]);
     EXPECT_EQ(1u, r[1]);
     EXPECT_EQ(2u, r[2]);
     EXPECT_EQ(3u, r[3]);
     EXPECT_EQ(4u, r[4]);
     EXPECT_EQ(5u, r[5]);
     EXPECT_EQ(6u, r[6]);
 }

 TEST(FontCollectionTest, FamilyMatchResultTest_iterator) {
     auto b = FontCollection::FamilyMatchResult::Builder();
     for (uint8_t i = 0; i < 7; ++i) {
         b.add(i);
     }
     auto r = b.build();
     EXPECT_EQ(7u, r.size());
     EXPECT_FALSE(r.empty());
     int i = 0;
     for (auto v : r) {
         EXPECT_EQ(i, v);
         i++;
     }
 }

 TEST(FontCollectionTest, FamilyMatchResultTest_intersect) {
     using Builder = FontCollection::FamilyMatchResult::Builder;

     EXPECT_EQ(Builder().add(1).add(2).add(3).build(),
               FontCollection::FamilyMatchResult::intersect(Builder().add(1).add(2).add(3).build(),
                                                            Builder().add(1).add(2).add(3).build()));

     EXPECT_EQ(Builder().build(),
               FontCollection::FamilyMatchResult::intersect(Builder().add(1).add(2).add(3).build(),
                                                            Builder().build()));

     EXPECT_EQ(Builder().build(),
               FontCollection::FamilyMatchResult::intersect(Builder().add(2).add(4).add(6).build(),
                                                            Builder().add(1).add(3).add(5).build()));

     EXPECT_EQ(Builder().add(1).add(3).build(),
               FontCollection::FamilyMatchResult::intersect(Builder().add(1).add(2).add(3).build(),
                                                            Builder().add(1).add(3).add(5).build()));
 }

 }  // namespace minikin
	/*
	* Copyright (C) 2015 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "minikin/FontCollection.h"

	#include <gtest/gtest.h>

	#include "FontTestUtils.h"
	#include "FreeTypeMinikinFontForTest.h"
	#include "MinikinInternal.h"

	namespace minikin {

	// The test font has following glyphs.
	// U+82A6
	// U+82A6 U+FE00 (VS1)
	// U+82A6 U+E0100 (VS17)
	// U+82A6 U+E0101 (VS18)
	// U+82A6 U+E0102 (VS19)
	// U+845B
	// U+845B U+FE01 (VS2)
	// U+845B U+E0101 (VS18)
	// U+845B U+E0102 (VS19)
	// U+845B U+E0103 (VS20)
	// U+537F
	// U+717D U+FE02 (VS3)
	// U+717D U+E0102 (VS19)
	// U+717D U+E0103 (VS20)
	const char kVsTestFont[] = "VariationSelectorTest-Regular.ttf";

	void expectVSGlyphs(const FontCollection* fc, uint32_t codepoint, const std::set<uint32_t>& vsSet) {
	for (uint32_t vs = 0xFE00; vs <= 0xE01EF; ++vs) {
	// Move to variation selectors supplements after variation selectors.
	if (vs == 0xFF00) {
	vs = 0xE0100;
	}
	if (vsSet.find(vs) == vsSet.end()) {
	EXPECT_FALSE(fc->hasVariationSelector(codepoint, vs))
	<< "Glyph for U+" << std::hex << codepoint << " U+" << vs;
	} else {
	EXPECT_TRUE(fc->hasVariationSelector(codepoint, vs))
	<< "Glyph for U+" << std::hex << codepoint << " U+" << vs;
	}
	}
	}

	void expectVSGlyphsForVsTestFont(const FontCollection* fc) {
	EXPECT_FALSE(fc->hasVariationSelector(0x82A6, 0));
	expectVSGlyphs(fc, 0x82A6, std::set<uint32_t>({0xFE00, 0xFE0E, 0xE0100, 0xE0101, 0xE0102}));

	EXPECT_FALSE(fc->hasVariationSelector(0x845B, 0));
	expectVSGlyphs(fc, 0x845B, std::set<uint32_t>({0xFE01, 0xFE0E, 0xE0101, 0xE0102, 0xE0103}));

	EXPECT_FALSE(fc->hasVariationSelector(0x537F, 0));
	expectVSGlyphs(fc, 0x537F, std::set<uint32_t>({0xFE0E}));

	EXPECT_FALSE(fc->hasVariationSelector(0x717D, 0));
	expectVSGlyphs(fc, 0x717D, std::set<uint32_t>({0xFE02, 0xE0102, 0xE0103}));
	}

	TEST(FontCollectionTest, hasVariationSelectorTest) {
	auto fc = buildFontCollection(kVsTestFont);
	expectVSGlyphsForVsTestFont(fc.get());
	}

	const char kEmojiXmlFile[] = "emoji.xml";

	TEST(FontCollectionTest, hasVariationSelectorTest_emoji) {
	auto collection = buildFontCollectionFromXml(kEmojiXmlFile);

	// Both text/color font have cmap format 14 subtable entry for VS15/VS16 respectively.
	EXPECT_TRUE(collection->hasVariationSelector(0x2623, 0xFE0E));
	EXPECT_TRUE(collection->hasVariationSelector(0x2623, 0xFE0F));

	// The text font has cmap format 14 subtable entry for VS15 but the color font doesn't have for
	// VS16
	EXPECT_TRUE(collection->hasVariationSelector(0x2626, 0xFE0E));
	EXPECT_FALSE(collection->hasVariationSelector(0x2626, 0xFE0F));

	// The color font has cmap format 14 subtable entry for VS16 but the text font doesn't have for
	// VS15.
	EXPECT_TRUE(collection->hasVariationSelector(0x262A, 0xFE0E));
	EXPECT_TRUE(collection->hasVariationSelector(0x262A, 0xFE0F));

	// Neither text/color font have cmap format 14 subtable entry for VS15/VS16.
	EXPECT_TRUE(collection->hasVariationSelector(0x262E, 0xFE0E));
	EXPECT_FALSE(collection->hasVariationSelector(0x262E, 0xFE0F));

	// Text font doesn't support U+1F3FD. Only the color emoji fonts has. So VS15 is not supported.
	EXPECT_FALSE(collection->hasVariationSelector(0x1F3FD, 0xFE0E));

	// Text font doesn't have U+262F U+FE0E or even its base code point U+262F.
	EXPECT_FALSE(collection->hasVariationSelector(0x262F, 0xFE0E));

	// None of the fonts support U+2229.
	EXPECT_FALSE(collection->hasVariationSelector(0x2229, 0xFE0E));
	EXPECT_FALSE(collection->hasVariationSelector(0x2229, 0xFE0F));
	}

	TEST(FontCollectionTest, newEmojiTest) {
	auto collection = buildFontCollectionFromXml(kEmojiXmlFile);

	// U+2695, U+2640, U+2642 are not in emoji catrgory in Unicode 9 but they are now in emoji
	// category. Should return true even if U+FE0E was appended.
	// These three emojis are only avalilable in TextEmoji.ttf but U+2695 is excluded here since it
	// is used in other tests.
	EXPECT_TRUE(collection->hasVariationSelector(0x2640, 0xFE0E));
	EXPECT_FALSE(collection->hasVariationSelector(0x2640, 0xFE0F));
	EXPECT_TRUE(collection->hasVariationSelector(0x2642, 0xFE0E));
	EXPECT_FALSE(collection->hasVariationSelector(0x2642, 0xFE0F));
	}

	TEST(FontCollectionTest, createWithVariations) {
	// This font has 'wdth' and 'wght' axes.
	const char kMultiAxisFont[] = "MultiAxis.ttf";
	const char kNoAxisFont[] = "Regular.ttf";

	std::shared_ptr<FontCollection> multiAxisFc = buildFontCollection(kMultiAxisFont);
	std::shared_ptr<FontCollection> noAxisFc = buildFontCollection(kNoAxisFont);

	{
	// Do not ceate new instance if none of variations are specified.
	EXPECT_EQ(nullptr,
	multiAxisFc->createCollectionWithVariation(std::vector<FontVariation>()));
	EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(std::vector<FontVariation>()));
	}
	{
	// New instance should be used for supported variation.
	std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f}};
	std::shared_ptr<FontCollection> newFc(
	multiAxisFc->createCollectionWithVariation(variations));
	EXPECT_NE(nullptr, newFc.get());
	EXPECT_NE(multiAxisFc.get(), newFc.get());

	EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
	}
	{
	// New instance should be used for supported variation (multiple variations case).
	std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f},
	{MinikinFont::MakeTag('w', 'g', 'h', 't'), 1.0f}};
	std::shared_ptr<FontCollection> newFc(
	multiAxisFc->createCollectionWithVariation(variations));
	EXPECT_NE(nullptr, newFc.get());
	EXPECT_NE(multiAxisFc.get(), newFc.get());

	EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
	}
	{
	// Do not ceate new instance if none of variations are supported.
	std::vector<FontVariation> variations = {{MinikinFont::MakeTag('Z', 'Z', 'Z', 'Z'), 1.0f}};
	EXPECT_EQ(nullptr, multiAxisFc->createCollectionWithVariation(variations));
	EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
	}
	{
	// At least one axis is supported, should create new instance.
	std::vector<FontVariation> variations = {{MinikinFont::MakeTag('w', 'd', 't', 'h'), 1.0f},
	{MinikinFont::MakeTag('Z', 'Z', 'Z', 'Z'), 1.0f}};
	std::shared_ptr<FontCollection> newFc(
	multiAxisFc->createCollectionWithVariation(variations));
	EXPECT_NE(nullptr, newFc.get());
	EXPECT_NE(multiAxisFc.get(), newFc.get());

	EXPECT_EQ(nullptr, noAxisFc->createCollectionWithVariation(variations));
	}
	}

	std::vector<uint8_t> writeToBuffer(
	const std::vector<std::shared_ptr<FontCollection>>& collections) {
	BufferWriter fakeWriter(nullptr);
	FontCollection::writeVector<writeFreeTypeMinikinFontForTest>(&fakeWriter, collections);
	std::vector<uint8_t> buffer(fakeWriter.size());
	BufferWriter writer(buffer.data());
	FontCollection::writeVector<writeFreeTypeMinikinFontForTest>(&writer, collections);
	return buffer;
	}

	TEST(FontCollectionTest, bufferTest) {
	{
	std::vector<std::shared_ptr<FontCollection>> original({buildFontCollection(kVsTestFont)});
	std::vector<uint8_t> buffer = writeToBuffer(original);
	BufferReader reader(buffer.data());
	auto copied = FontCollection::readVector<readFreeTypeMinikinFontForTest>(&reader);
	EXPECT_EQ(1u, copied.size());
	expectVSGlyphsForVsTestFont(copied[0].get());
	EXPECT_EQ(original[0]->getSupportedTags(), copied[0]->getSupportedTags());
	// Id will be different.
	EXPECT_NE(original[0]->getId(), copied[0]->getId());
	std::vector<uint8_t> newBuffer = writeToBuffer(copied);
	EXPECT_EQ(buffer, newBuffer);
	}
	{
	// Test that FontFamily instances are shared.
	std::vector<std::shared_ptr<FontFamily>> families = {buildFontFamily(kVsTestFont)};
	auto fc1 = std::make_shared<FontCollection>(families);
	auto fc2 = std::make_shared<FontCollection>(families);
	std::vector<std::shared_ptr<FontCollection>> original({fc1, fc2});
	std::vector<uint8_t> buffer = writeToBuffer(original);
	BufferReader reader(buffer.data());
	auto copied = FontCollection::readVector<readFreeTypeMinikinFontForTest>(&reader);
	EXPECT_EQ(2u, copied.size());
	EXPECT_EQ(copied[0]->mFamilies[0], copied[1]->mFamilies[0]);
	std::vector<uint8_t> newBuffer = writeToBuffer(copied);
	EXPECT_EQ(buffer, newBuffer);
	}
	{
	// Test axes.
	// This font has 'wdth' and 'wght' axes.
	const char kMultiAxisFont[] = "MultiAxis.ttf";
	std::vector<std::shared_ptr<FontCollection>> original(
	{buildFontCollection(kMultiAxisFont)});
	std::vector<uint8_t> buffer = writeToBuffer(original);
	BufferReader reader(buffer.data());
	auto copied = FontCollection::readVector<readFreeTypeMinikinFontForTest>(&reader);
	EXPECT_EQ(1u, copied.size());
	EXPECT_EQ(1u,
	copied[0]->getSupportedTags().count(MinikinFont::MakeTag('w', 'd', 't', 'h')));
	EXPECT_EQ(1u,
	copied[0]->getSupportedTags().count(MinikinFont::MakeTag('w', 'g', 'h', 't')));
	std::vector<uint8_t> newBuffer = writeToBuffer(copied);
	EXPECT_EQ(buffer, newBuffer);
	}
	}

	TEST(FontCollectionTest, FamilyMatchResultBuilderTest) {
	using Builder = FontCollection::FamilyMatchResult::Builder;
	EXPECT_TRUE(Builder().empty());
	EXPECT_EQ(0u, Builder().size());
	EXPECT_EQ(1u, Builder().add(5).size());
	EXPECT_EQ(2u, Builder().add(5).add(4).size());

	// Reset
	EXPECT_TRUE(Builder().add(5).reset().empty());
	EXPECT_EQ(0u, Builder().add(5).reset().size());
	}

	TEST(FontCollectionTest, FamilyMatchResultTest) {
	using Builder = FontCollection::FamilyMatchResult::Builder;

	auto r = Builder().build();
	EXPECT_EQ(0u, r.size());
	EXPECT_TRUE(r.empty());

	r = Builder().add(1).build();
	EXPECT_EQ(1u, r.size());
	EXPECT_FALSE(r.empty());
	EXPECT_EQ(1u, r[0]);

	r = Builder().add(1).add(2).build();
	EXPECT_EQ(2u, r.size());
	EXPECT_FALSE(r.empty());
	EXPECT_EQ(1u, r[0]);
	EXPECT_EQ(2u, r[1]);
	}

	TEST(FontCollectionTest, FamilyMatchResultTest_BuilderHoldeFirst7) {
	auto b = FontCollection::FamilyMatchResult::Builder();
	for (uint8_t i = 0; i < 128; ++i) {
	b.add(i);
	}
	auto r = b.build();
	EXPECT_EQ(7u, r.size());
	EXPECT_FALSE(r.empty());
	EXPECT_EQ(0u, r[0]);
	EXPECT_EQ(1u, r[1]);
	EXPECT_EQ(2u, r[2]);
	EXPECT_EQ(3u, r[3]);
	EXPECT_EQ(4u, r[4]);
	EXPECT_EQ(5u, r[5]);
	EXPECT_EQ(6u, r[6]);
	}

	TEST(FontCollectionTest, FamilyMatchResultTest_iterator) {
	auto b = FontCollection::FamilyMatchResult::Builder();
	for (uint8_t i = 0; i < 7; ++i) {
	b.add(i);
	}
	auto r = b.build();
	EXPECT_EQ(7u, r.size());
	EXPECT_FALSE(r.empty());
	int i = 0;
	for (auto v : r) {
	EXPECT_EQ(i, v);
	i++;
	}
	}

	TEST(FontCollectionTest, FamilyMatchResultTest_intersect) {
	using Builder = FontCollection::FamilyMatchResult::Builder;

	EXPECT_EQ(Builder().add(1).add(2).add(3).build(),
	FontCollection::FamilyMatchResult::intersect(Builder().add(1).add(2).add(3).build(),
	Builder().add(1).add(2).add(3).build()));

	EXPECT_EQ(Builder().build(),
	FontCollection::FamilyMatchResult::intersect(Builder().add(1).add(2).add(3).build(),
	Builder().build()));

	EXPECT_EQ(Builder().build(),
	FontCollection::FamilyMatchResult::intersect(Builder().add(2).add(4).add(6).build(),
	Builder().add(1).add(3).add(5).build()));

	EXPECT_EQ(Builder().add(1).add(3).build(),
	FontCollection::FamilyMatchResult::intersect(Builder().add(1).add(2).add(3).build(),
	Builder().add(1).add(3).add(5).build()));
	}

	} // namespace minikin