chromium/src/third_party/blink/renderer/platform/fonts/shaping/shape_result_view_test.cc - manifest_repos/chromium_src - Git at Google

 // Copyright 2018 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "third_party/blink/renderer/platform/fonts/shaping/shaping_line_breaker.h"

 #include <unicode/uscript.h>
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/blink/renderer/platform/fonts/font.h"
 #include "third_party/blink/renderer/platform/fonts/font_cache.h"
 #include "third_party/blink/renderer/platform/fonts/font_test_utilities.h"
 #include "third_party/blink/renderer/platform/fonts/shaping/harfbuzz_shaper.h"
 #include "third_party/blink/renderer/platform/fonts/shaping/shape_result.h"
 #include "third_party/blink/renderer/platform/fonts/shaping/shape_result_test_info.h"
 #include "third_party/blink/renderer/platform/fonts/shaping/shape_result_view.h"

 namespace blink {

 class ShapeResultViewTest : public testing::Test {
  protected:
   void SetUp() override {
     font_description.SetComputedSize(12.0);
     font = Font(font_description);
   }

   void TearDown() override {}

   FontCachePurgePreventer font_cache_purge_preventer;
   FontDescription font_description;
   Font font;
 };

 TEST_F(ShapeResultViewTest, LatinSingleView) {
   String string =
       To16Bit("Test run with multiple words and breaking opportunities.", 56);
   TextDirection direction = TextDirection::kLtr;

   HarfBuzzShaper shaper(string);
   scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> glyphs;
   result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs));

   // Test view at the start of the result: "Test run with multiple"
   ShapeResultView::Segment segment = {result.get(), 0, 22};
   auto first4 = ShapeResultView::Create(&segment, 1);

   EXPECT_EQ(first4->StartIndex(), 0u);
   EXPECT_EQ(first4->NumCharacters(), 22u);
   EXPECT_EQ(first4->NumGlyphs(), 22u);

   Vector<ShapeResultTestGlyphInfo> first4_glyphs;
   first4->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&first4_glyphs));
   EXPECT_EQ(first4_glyphs.size(), 22u);
   EXPECT_TRUE(CompareResultGlyphs(first4_glyphs, glyphs, 0u, 22u));

   // Test view in the middle of the result: "multiple words and breaking"
   segment = {result.get(), 14, 41};
   auto middle4 = ShapeResultView::Create(&segment, 1);

   EXPECT_EQ(middle4->StartIndex(), 14u);
   EXPECT_EQ(middle4->NumCharacters(), 27u);
   EXPECT_EQ(middle4->NumGlyphs(), 27u);

   Vector<ShapeResultTestGlyphInfo> middle4_glyphs;
   middle4->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&middle4_glyphs));
   EXPECT_EQ(middle4_glyphs.size(), 27u);
   EXPECT_TRUE(CompareResultGlyphs(middle4_glyphs, glyphs, 14u, 27u));

   // Test view at the end of the result: "breaking opportunities."
   segment = {result.get(), 33, 56};
   auto last2 = ShapeResultView::Create(&segment, 1);

   EXPECT_EQ(last2->StartIndex(), 33u);
   EXPECT_EQ(last2->NumCharacters(), 23u);
   EXPECT_EQ(last2->NumGlyphs(), 23u);

   Vector<ShapeResultTestGlyphInfo> last2_glyphs;
   last2->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&last2_glyphs));
   EXPECT_EQ(last2_glyphs.size(), 23u);
   EXPECT_TRUE(CompareResultGlyphs(last2_glyphs, glyphs, 33u, 23u));
 }

 TEST_F(ShapeResultViewTest, ArabicSingleView) {
   String string = To16Bit("عربى نص", 7);
   TextDirection direction = TextDirection::kRtl;

   HarfBuzzShaper shaper(string);
   scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> glyphs;
   result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs));

   // Test view at the start of the result: "عربى"
   ShapeResultView::Segment segment = {result.get(), 0, 4};
   auto first_word = ShapeResultView::Create(&segment, 1);
   Vector<ShapeResultTestGlyphInfo> first_glyphs;
   first_word->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&first_glyphs));

   EXPECT_EQ(first_word->StartIndex(), 0u);
   EXPECT_EQ(first_word->NumCharacters(), 4u);
   EXPECT_EQ(first_word->NumGlyphs(), 4u);
   EXPECT_EQ(first_glyphs.size(), 4u);

   String first_reference_string = To16Bit("عربى", 4);
   HarfBuzzShaper first_reference_shaper(first_reference_string);
   scoped_refptr<const ShapeResult> first_wortd_reference =
       first_reference_shaper.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> first_reference_glyphs;
   first_wortd_reference->ForEachGlyph(
       0, AddGlyphInfo, static_cast<void*>(&first_reference_glyphs));
   EXPECT_EQ(first_reference_glyphs.size(), 4u);

   EXPECT_TRUE(
       CompareResultGlyphs(first_glyphs, first_reference_glyphs, 0u, 4u));
   EXPECT_TRUE(CompareResultGlyphs(first_glyphs, glyphs, 3u, 7u));

   // Test view at the end of the result: "نص"
   segment = {result.get(), 4, 7};
   auto last_word = ShapeResultView::Create(&segment, 1);
   Vector<ShapeResultTestGlyphInfo> last_glyphs;
   last_word->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&last_glyphs));

   EXPECT_EQ(last_word->StartIndex(), 4u);
   EXPECT_EQ(last_word->NumCharacters(), 3u);
   EXPECT_EQ(last_word->NumGlyphs(), 3u);
   EXPECT_EQ(last_glyphs.size(), 3u);
 }

 TEST_F(ShapeResultViewTest, PreviousSafeToBreak) {
   String string =
       u"\u0028\u05D1\u0029\u0020\u05D4\u05D1\u05DC\u0020\u05D0\u05DE\u05E8"
       u"\u0020\u05E2\u05DC\u0020"
       u"\u05D3\u05D1\u05E8\u05D9\u0020\u05D4\u05D1\u05DC\u05D9\u0020\u05D4"
       u"\u05E2\u05D5\u05DC\u05DD\u002C"
       u"\u0020\u05D5\u05E1\u05DE\u05DA\u0020\u05D4\u05B2\u05D1\u05B5\u05DC"
       u"\u0020\u05D0\u05DC\u0020\u05D4"
       u"\u05D1\u05DC\u05D9\u05DD\u0020\u05D5\u05D0\u05DD\u0020\u05DC\u05D0"
       u"\u0020\u05D9\u05DE\u05E6\u05D0"
       u"\u0020\u05DE\u05D4\u05E9\u05DE\u05D5\u05EA\u0020\u05E9\u05D4\u05DD"
       u"\u0020\u05E2\u05DC\u0020\u05DE"
       u"\u05E9\u05E7\u05DC\u0020\u05D0\u05E8\u05E5\u0020\u05E9\u05D9\u05E9"
       u"\u05EA\u05E0\u05D4\u0020\u05D7"
       u"\u05D5\u05E5\u0020\u05DE\u05B5\u05D7\u05B2\u05D3\u05B7\u05E8\u0020"
       u"\u05DE\u05B4\u05E9\u05B0\u05C1"
       u"\u05DB\u05B8\u05D1\u05B0\u05DA\u05B8\u0020\u0028\u05E9\u05DE\u05D5"
       u"\u05EA\u0020\u05D6\u05F3\u003A"
       u"\u05DB\u05F4\u05D7\u0029";
   TextDirection direction = TextDirection::kRtl;
   HarfBuzzShaper shaper(string);
   const RunSegmenter::RunSegmenterRange range = {
       51, 131, USCRIPT_HEBREW, blink::OrientationIterator::kOrientationKeep,
       blink::FontFallbackPriority::kText};
   scoped_refptr<ShapeResult> shape_result =
       shaper.Shape(&font, direction, 51, 131, range);

   unsigned start_offset = 59;
   unsigned end_offset = 118;
   scoped_refptr<const ShapeResultView> result_view =
       ShapeResultView::Create(shape_result.get(), start_offset, end_offset);
   scoped_refptr<ShapeResult> result = result_view->CreateShapeResult();

   unsigned offset = end_offset;
   do {
     unsigned safe = result_view->PreviousSafeToBreakOffset(offset);
     unsigned cached_safe = result->CachedPreviousSafeToBreakOffset(offset);
     EXPECT_EQ(safe, cached_safe);
   } while (--offset > start_offset);
 }

 TEST_F(ShapeResultViewTest, LatinMultiRun) {
   TextDirection direction = TextDirection::kLtr;
   HarfBuzzShaper shaper_a(To16Bit("hello", 5));
   HarfBuzzShaper shaper_b(To16Bit(" w", 2));
   HarfBuzzShaper shaper_c(To16Bit("orld", 4));
   HarfBuzzShaper shaper_d(To16Bit("!", 1));

   // Combine four separate results into a single one to ensure we have a result
   // with multiple runs: "hello world!"
   scoped_refptr<ShapeResult> result =
       ShapeResult::Create(&font, 0, 0, direction);
   shaper_a.Shape(&font, direction)->CopyRange(0u, 5u, result.get());
   shaper_b.Shape(&font, direction)->CopyRange(0u, 2u, result.get());
   shaper_c.Shape(&font, direction)->CopyRange(0u, 4u, result.get());
   shaper_d.Shape(&font, direction)->CopyRange(0u, 1u, result.get());

   Vector<ShapeResultTestGlyphInfo> result_glyphs;
   result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&result_glyphs));

   // Create composite view out of multiple segments where at least some of the
   // segments have multiple runs: "hello wood wold!"
   ShapeResultView::Segment segments[5] = {
       {result.get(), 0, 8},    // "hello wo"
       {result.get(), 7, 8},    // "o"
       {result.get(), 10, 11},  // "d"
       {result.get(), 5, 8},    // " wo"
       {result.get(), 9, 12},   // "ld!"
   };
   auto composite_view = ShapeResultView::Create(&segments[0], 5);
   Vector<ShapeResultTestGlyphInfo> view_glyphs;
   composite_view->ForEachGlyph(0, AddGlyphInfo,
                                static_cast<void*>(&view_glyphs));

   EXPECT_EQ(composite_view->StartIndex(), 0u);
   EXPECT_EQ(composite_view->NumCharacters(), 16u);
   EXPECT_EQ(composite_view->NumGlyphs(), 16u);
   EXPECT_EQ(view_glyphs.size(), 16u);

   HarfBuzzShaper shaper2(To16Bit("hello world!", 12));
   scoped_refptr<const ShapeResult> result2 = shaper2.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> glyphs2;
   result2->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs2));
   EXPECT_TRUE(CompareResultGlyphs(result_glyphs, glyphs2, 0u, 12u));

   HarfBuzzShaper reference_shaper(To16Bit("hello wood wold!", 16));
   scoped_refptr<const ShapeResult> reference_result =
       reference_shaper.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> reference_glyphs;
   reference_result->ForEachGlyph(0, AddGlyphInfo,
                                  static_cast<void*>(&reference_glyphs));

   scoped_refptr<ShapeResult> composite_copy =
       ShapeResult::Create(&font, 0, 0, direction);
   result->CopyRange(0, 8, composite_copy.get());
   result->CopyRange(7, 8, composite_copy.get());
   result->CopyRange(10, 11, composite_copy.get());
   result->CopyRange(5, 8, composite_copy.get());
   result->CopyRange(9, 12, composite_copy.get());

   Vector<ShapeResultTestGlyphInfo> composite_copy_glyphs;
   composite_copy->ForEachGlyph(0, AddGlyphInfo,
                                static_cast<void*>(&composite_copy_glyphs));

   EXPECT_TRUE(CompareResultGlyphs(view_glyphs, reference_glyphs, 0u, 16u));
   EXPECT_TRUE(
       CompareResultGlyphs(composite_copy_glyphs, reference_glyphs, 0u, 16u));
   EXPECT_EQ(composite_view->Width(), composite_copy->Width());
 }

 TEST_F(ShapeResultViewTest, LatinCompositeView) {
   String string =
       To16Bit("Test run with multiple words and breaking opportunities.", 56);
   TextDirection direction = TextDirection::kLtr;

   HarfBuzzShaper shaper(string);
   scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> glyphs;
   result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs));

   String reference_string = To16Bit("multiple breaking opportunities Test", 36);
   HarfBuzzShaper reference_shaper(reference_string);
   scoped_refptr<const ShapeResult> reference_result =
       reference_shaper.Shape(&font, direction);
   Vector<ShapeResultTestGlyphInfo> reference_glyphs;

   // Match the character index logic of ShapeResult::CopyRange where the the
   // character index of the first result is preserved and all subsequent ones
   // are adjusted to be sequential.
   // TODO(layout-dev): Arguably both should be updated to renumber the first
   // result as well but some callers depend on the existing behavior.
   scoped_refptr<ShapeResult> composite_copy =
       ShapeResult::Create(&font, 0, 0, direction);
   result->CopyRange(14, 23, composite_copy.get());
   result->CopyRange(33, 55, composite_copy.get());
   result->CopyRange(4, 5, composite_copy.get());
   result->CopyRange(0, 4, composite_copy.get());
   EXPECT_EQ(composite_copy->NumCharacters(), reference_result->NumCharacters());
   EXPECT_EQ(composite_copy->NumGlyphs(), reference_result->NumGlyphs());
   composite_copy->ForEachGlyph(0, AddGlyphInfo,
                                static_cast<void*>(&reference_glyphs));

   // Create composite view out of multiple segments:
   ShapeResultView::Segment segments[4] = {
       {result.get(), 14, 23},  // "multiple "
       {result.get(), 33, 55},  // "breaking opportunities"
       {result.get(), 4, 5},    // " "
       {result.get(), 0, 4}     // "Test"
   };
   auto composite_view = ShapeResultView::Create(&segments[0], 4);

   EXPECT_EQ(composite_view->StartIndex(), composite_copy->StartIndex());
   EXPECT_EQ(composite_view->NumCharacters(), reference_result->NumCharacters());
   EXPECT_EQ(composite_view->NumGlyphs(), reference_result->NumGlyphs());

   Vector<ShapeResultTestGlyphInfo> composite_glyphs;
   composite_view->ForEachGlyph(0, AddGlyphInfo,
                                static_cast<void*>(&composite_glyphs));
   EXPECT_EQ(composite_glyphs.size(), 36u);
   EXPECT_TRUE(CompareResultGlyphs(composite_glyphs, reference_glyphs, 0u, 22u));
   EXPECT_EQ(composite_view->Width(), composite_copy->Width());
 }

 TEST_F(ShapeResultViewTest, MixedScriptsCompositeView) {
   String string_a = To16Bit("Test with multiple 字体 ", 22);
   String string_b = To16Bit("and 本書.", 7);
   TextDirection direction = TextDirection::kLtr;

   HarfBuzzShaper shaper_a(string_a);
   scoped_refptr<const ShapeResult> result_a = shaper_a.Shape(&font, direction);
   HarfBuzzShaper shaper_b(string_b);
   scoped_refptr<const ShapeResult> result_b = shaper_b.Shape(&font, direction);

   String reference_string = To16Bit("Test with multiple 字体 and 本書.", 29);
   HarfBuzzShaper reference_shaper(reference_string);
   scoped_refptr<const ShapeResult> reference_result =
       reference_shaper.Shape(&font, direction);

   // Create a copy using CopyRange and compare with that to ensure that the same
   // fonts are used for both the composite and the reference. The combined
   // reference_result data might use different fonts, resulting in different
   // glyph ids and metrics.
   scoped_refptr<ShapeResult> composite_copy =
       ShapeResult::Create(&font, 0, 0, direction);
   result_a->CopyRange(0, 22, composite_copy.get());
   result_b->CopyRange(0, 7, composite_copy.get());
   EXPECT_EQ(composite_copy->NumCharacters(), reference_result->NumCharacters());
   EXPECT_EQ(composite_copy->NumGlyphs(), reference_result->NumGlyphs());
   Vector<ShapeResultTestGlyphInfo> reference_glyphs;
   composite_copy->ForEachGlyph(0, AddGlyphInfo,
                                static_cast<void*>(&reference_glyphs));

   ShapeResultView::Segment segments[4] = {{result_a.get(), 0, 22},
                                           {result_b.get(), 0, 7}};
   auto composite_view = ShapeResultView::Create(&segments[0], 2);

   EXPECT_EQ(composite_view->StartIndex(), 0u);
   EXPECT_EQ(composite_view->NumCharacters(), reference_result->NumCharacters());
   EXPECT_EQ(composite_view->NumGlyphs(), reference_result->NumGlyphs());

   Vector<ShapeResultTestGlyphInfo> composite_glyphs;
   composite_view->ForEachGlyph(0, AddGlyphInfo,
                                static_cast<void*>(&composite_glyphs));
   EXPECT_TRUE(CompareResultGlyphs(composite_glyphs, reference_glyphs, 0u,
                                   reference_glyphs.size()));
   EXPECT_EQ(composite_view->Width(), composite_copy->Width());
 }

 TEST_F(ShapeResultViewTest, TrimEndOfView) {
   String string = To16Bit("12345678901234567890", 20);
   TextDirection direction = TextDirection::kLtr;
   HarfBuzzShaper shaper(string);
   scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);

   // Create a view from 5 to 20.
   scoped_refptr<const ShapeResultView> view1 =
       ShapeResultView::Create(result.get(), 5, 20);
   EXPECT_EQ(view1->NumCharacters(), 15u);
   EXPECT_EQ(view1->NumGlyphs(), 15u);

   // Trim the last character from the view.
   scoped_refptr<const ShapeResultView> view2 =
       ShapeResultView::Create(view1.get(), 5, 19);
   EXPECT_EQ(view2->NumCharacters(), 14u);
   EXPECT_EQ(view2->NumGlyphs(), 14u);
 }

 }  // namespace blink
	// Copyright 2018 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "third_party/blink/renderer/platform/fonts/shaping/shaping_line_breaker.h"

	#include <unicode/uscript.h>
	#include "testing/gtest/include/gtest/gtest.h"
	#include "third_party/blink/renderer/platform/fonts/font.h"
	#include "third_party/blink/renderer/platform/fonts/font_cache.h"
	#include "third_party/blink/renderer/platform/fonts/font_test_utilities.h"
	#include "third_party/blink/renderer/platform/fonts/shaping/harfbuzz_shaper.h"
	#include "third_party/blink/renderer/platform/fonts/shaping/shape_result.h"
	#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_test_info.h"
	#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_view.h"

	namespace blink {

	class ShapeResultViewTest : public testing::Test {
	protected:
	void SetUp() override {
	font_description.SetComputedSize(12.0);
	font = Font(font_description);
	}

	void TearDown() override {}

	FontCachePurgePreventer font_cache_purge_preventer;
	FontDescription font_description;
	Font font;
	};

	TEST_F(ShapeResultViewTest, LatinSingleView) {
	String string =
	To16Bit("Test run with multiple words and breaking opportunities.", 56);
	TextDirection direction = TextDirection::kLtr;

	HarfBuzzShaper shaper(string);
	scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> glyphs;
	result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs));

	// Test view at the start of the result: "Test run with multiple"
	ShapeResultView::Segment segment = {result.get(), 0, 22};
	auto first4 = ShapeResultView::Create(&segment, 1);

	EXPECT_EQ(first4->StartIndex(), 0u);
	EXPECT_EQ(first4->NumCharacters(), 22u);
	EXPECT_EQ(first4->NumGlyphs(), 22u);

	Vector<ShapeResultTestGlyphInfo> first4_glyphs;
	first4->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&first4_glyphs));
	EXPECT_EQ(first4_glyphs.size(), 22u);
	EXPECT_TRUE(CompareResultGlyphs(first4_glyphs, glyphs, 0u, 22u));

	// Test view in the middle of the result: "multiple words and breaking"
	segment = {result.get(), 14, 41};
	auto middle4 = ShapeResultView::Create(&segment, 1);

	EXPECT_EQ(middle4->StartIndex(), 14u);
	EXPECT_EQ(middle4->NumCharacters(), 27u);
	EXPECT_EQ(middle4->NumGlyphs(), 27u);

	Vector<ShapeResultTestGlyphInfo> middle4_glyphs;
	middle4->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&middle4_glyphs));
	EXPECT_EQ(middle4_glyphs.size(), 27u);
	EXPECT_TRUE(CompareResultGlyphs(middle4_glyphs, glyphs, 14u, 27u));

	// Test view at the end of the result: "breaking opportunities."
	segment = {result.get(), 33, 56};
	auto last2 = ShapeResultView::Create(&segment, 1);

	EXPECT_EQ(last2->StartIndex(), 33u);
	EXPECT_EQ(last2->NumCharacters(), 23u);
	EXPECT_EQ(last2->NumGlyphs(), 23u);

	Vector<ShapeResultTestGlyphInfo> last2_glyphs;
	last2->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&last2_glyphs));
	EXPECT_EQ(last2_glyphs.size(), 23u);
	EXPECT_TRUE(CompareResultGlyphs(last2_glyphs, glyphs, 33u, 23u));
	}

	TEST_F(ShapeResultViewTest, ArabicSingleView) {
	String string = To16Bit("عربى نص", 7);
	TextDirection direction = TextDirection::kRtl;

	HarfBuzzShaper shaper(string);
	scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> glyphs;
	result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs));

	// Test view at the start of the result: "عربى"
	ShapeResultView::Segment segment = {result.get(), 0, 4};
	auto first_word = ShapeResultView::Create(&segment, 1);
	Vector<ShapeResultTestGlyphInfo> first_glyphs;
	first_word->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&first_glyphs));

	EXPECT_EQ(first_word->StartIndex(), 0u);
	EXPECT_EQ(first_word->NumCharacters(), 4u);
	EXPECT_EQ(first_word->NumGlyphs(), 4u);
	EXPECT_EQ(first_glyphs.size(), 4u);

	String first_reference_string = To16Bit("عربى", 4);
	HarfBuzzShaper first_reference_shaper(first_reference_string);
	scoped_refptr<const ShapeResult> first_wortd_reference =
	first_reference_shaper.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> first_reference_glyphs;
	first_wortd_reference->ForEachGlyph(
	0, AddGlyphInfo, static_cast<void*>(&first_reference_glyphs));
	EXPECT_EQ(first_reference_glyphs.size(), 4u);

	EXPECT_TRUE(
	CompareResultGlyphs(first_glyphs, first_reference_glyphs, 0u, 4u));
	EXPECT_TRUE(CompareResultGlyphs(first_glyphs, glyphs, 3u, 7u));

	// Test view at the end of the result: "نص"
	segment = {result.get(), 4, 7};
	auto last_word = ShapeResultView::Create(&segment, 1);
	Vector<ShapeResultTestGlyphInfo> last_glyphs;
	last_word->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&last_glyphs));

	EXPECT_EQ(last_word->StartIndex(), 4u);
	EXPECT_EQ(last_word->NumCharacters(), 3u);
	EXPECT_EQ(last_word->NumGlyphs(), 3u);
	EXPECT_EQ(last_glyphs.size(), 3u);
	}

	TEST_F(ShapeResultViewTest, PreviousSafeToBreak) {
	String string =
	u"\u0028\u05D1\u0029\u0020\u05D4\u05D1\u05DC\u0020\u05D0\u05DE\u05E8"
	u"\u0020\u05E2\u05DC\u0020"
	u"\u05D3\u05D1\u05E8\u05D9\u0020\u05D4\u05D1\u05DC\u05D9\u0020\u05D4"
	u"\u05E2\u05D5\u05DC\u05DD\u002C"
	u"\u0020\u05D5\u05E1\u05DE\u05DA\u0020\u05D4\u05B2\u05D1\u05B5\u05DC"
	u"\u0020\u05D0\u05DC\u0020\u05D4"
	u"\u05D1\u05DC\u05D9\u05DD\u0020\u05D5\u05D0\u05DD\u0020\u05DC\u05D0"
	u"\u0020\u05D9\u05DE\u05E6\u05D0"
	u"\u0020\u05DE\u05D4\u05E9\u05DE\u05D5\u05EA\u0020\u05E9\u05D4\u05DD"
	u"\u0020\u05E2\u05DC\u0020\u05DE"
	u"\u05E9\u05E7\u05DC\u0020\u05D0\u05E8\u05E5\u0020\u05E9\u05D9\u05E9"
	u"\u05EA\u05E0\u05D4\u0020\u05D7"
	u"\u05D5\u05E5\u0020\u05DE\u05B5\u05D7\u05B2\u05D3\u05B7\u05E8\u0020"
	u"\u05DE\u05B4\u05E9\u05B0\u05C1"
	u"\u05DB\u05B8\u05D1\u05B0\u05DA\u05B8\u0020\u0028\u05E9\u05DE\u05D5"
	u"\u05EA\u0020\u05D6\u05F3\u003A"
	u"\u05DB\u05F4\u05D7\u0029";
	TextDirection direction = TextDirection::kRtl;
	HarfBuzzShaper shaper(string);
	const RunSegmenter::RunSegmenterRange range = {
	51, 131, USCRIPT_HEBREW, blink::OrientationIterator::kOrientationKeep,
	blink::FontFallbackPriority::kText};
	scoped_refptr<ShapeResult> shape_result =
	shaper.Shape(&font, direction, 51, 131, range);

	unsigned start_offset = 59;
	unsigned end_offset = 118;
	scoped_refptr<const ShapeResultView> result_view =
	ShapeResultView::Create(shape_result.get(), start_offset, end_offset);
	scoped_refptr<ShapeResult> result = result_view->CreateShapeResult();

	unsigned offset = end_offset;
	do {
	unsigned safe = result_view->PreviousSafeToBreakOffset(offset);
	unsigned cached_safe = result->CachedPreviousSafeToBreakOffset(offset);
	EXPECT_EQ(safe, cached_safe);
	} while (--offset > start_offset);
	}

	TEST_F(ShapeResultViewTest, LatinMultiRun) {
	TextDirection direction = TextDirection::kLtr;
	HarfBuzzShaper shaper_a(To16Bit("hello", 5));
	HarfBuzzShaper shaper_b(To16Bit(" w", 2));
	HarfBuzzShaper shaper_c(To16Bit("orld", 4));
	HarfBuzzShaper shaper_d(To16Bit("!", 1));

	// Combine four separate results into a single one to ensure we have a result
	// with multiple runs: "hello world!"
	scoped_refptr<ShapeResult> result =
	ShapeResult::Create(&font, 0, 0, direction);
	shaper_a.Shape(&font, direction)->CopyRange(0u, 5u, result.get());
	shaper_b.Shape(&font, direction)->CopyRange(0u, 2u, result.get());
	shaper_c.Shape(&font, direction)->CopyRange(0u, 4u, result.get());
	shaper_d.Shape(&font, direction)->CopyRange(0u, 1u, result.get());

	Vector<ShapeResultTestGlyphInfo> result_glyphs;
	result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&result_glyphs));

	// Create composite view out of multiple segments where at least some of the
	// segments have multiple runs: "hello wood wold!"
	ShapeResultView::Segment segments[5] = {
	{result.get(), 0, 8}, // "hello wo"
	{result.get(), 7, 8}, // "o"
	{result.get(), 10, 11}, // "d"
	{result.get(), 5, 8}, // " wo"
	{result.get(), 9, 12}, // "ld!"
	};
	auto composite_view = ShapeResultView::Create(&segments[0], 5);
	Vector<ShapeResultTestGlyphInfo> view_glyphs;
	composite_view->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&view_glyphs));

	EXPECT_EQ(composite_view->StartIndex(), 0u);
	EXPECT_EQ(composite_view->NumCharacters(), 16u);
	EXPECT_EQ(composite_view->NumGlyphs(), 16u);
	EXPECT_EQ(view_glyphs.size(), 16u);

	HarfBuzzShaper shaper2(To16Bit("hello world!", 12));
	scoped_refptr<const ShapeResult> result2 = shaper2.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> glyphs2;
	result2->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs2));
	EXPECT_TRUE(CompareResultGlyphs(result_glyphs, glyphs2, 0u, 12u));

	HarfBuzzShaper reference_shaper(To16Bit("hello wood wold!", 16));
	scoped_refptr<const ShapeResult> reference_result =
	reference_shaper.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> reference_glyphs;
	reference_result->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&reference_glyphs));

	scoped_refptr<ShapeResult> composite_copy =
	ShapeResult::Create(&font, 0, 0, direction);
	result->CopyRange(0, 8, composite_copy.get());
	result->CopyRange(7, 8, composite_copy.get());
	result->CopyRange(10, 11, composite_copy.get());
	result->CopyRange(5, 8, composite_copy.get());
	result->CopyRange(9, 12, composite_copy.get());

	Vector<ShapeResultTestGlyphInfo> composite_copy_glyphs;
	composite_copy->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&composite_copy_glyphs));

	EXPECT_TRUE(CompareResultGlyphs(view_glyphs, reference_glyphs, 0u, 16u));
	EXPECT_TRUE(
	CompareResultGlyphs(composite_copy_glyphs, reference_glyphs, 0u, 16u));
	EXPECT_EQ(composite_view->Width(), composite_copy->Width());
	}

	TEST_F(ShapeResultViewTest, LatinCompositeView) {
	String string =
	To16Bit("Test run with multiple words and breaking opportunities.", 56);
	TextDirection direction = TextDirection::kLtr;

	HarfBuzzShaper shaper(string);
	scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> glyphs;
	result->ForEachGlyph(0, AddGlyphInfo, static_cast<void*>(&glyphs));

	String reference_string = To16Bit("multiple breaking opportunities Test", 36);
	HarfBuzzShaper reference_shaper(reference_string);
	scoped_refptr<const ShapeResult> reference_result =
	reference_shaper.Shape(&font, direction);
	Vector<ShapeResultTestGlyphInfo> reference_glyphs;

	// Match the character index logic of ShapeResult::CopyRange where the the
	// character index of the first result is preserved and all subsequent ones
	// are adjusted to be sequential.
	// TODO(layout-dev): Arguably both should be updated to renumber the first
	// result as well but some callers depend on the existing behavior.
	scoped_refptr<ShapeResult> composite_copy =
	ShapeResult::Create(&font, 0, 0, direction);
	result->CopyRange(14, 23, composite_copy.get());
	result->CopyRange(33, 55, composite_copy.get());
	result->CopyRange(4, 5, composite_copy.get());
	result->CopyRange(0, 4, composite_copy.get());
	EXPECT_EQ(composite_copy->NumCharacters(), reference_result->NumCharacters());
	EXPECT_EQ(composite_copy->NumGlyphs(), reference_result->NumGlyphs());
	composite_copy->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&reference_glyphs));

	// Create composite view out of multiple segments:
	ShapeResultView::Segment segments[4] = {
	{result.get(), 14, 23}, // "multiple "
	{result.get(), 33, 55}, // "breaking opportunities"
	{result.get(), 4, 5}, // " "
	{result.get(), 0, 4} // "Test"
	};
	auto composite_view = ShapeResultView::Create(&segments[0], 4);

	EXPECT_EQ(composite_view->StartIndex(), composite_copy->StartIndex());
	EXPECT_EQ(composite_view->NumCharacters(), reference_result->NumCharacters());
	EXPECT_EQ(composite_view->NumGlyphs(), reference_result->NumGlyphs());

	Vector<ShapeResultTestGlyphInfo> composite_glyphs;
	composite_view->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&composite_glyphs));
	EXPECT_EQ(composite_glyphs.size(), 36u);
	EXPECT_TRUE(CompareResultGlyphs(composite_glyphs, reference_glyphs, 0u, 22u));
	EXPECT_EQ(composite_view->Width(), composite_copy->Width());
	}

	TEST_F(ShapeResultViewTest, MixedScriptsCompositeView) {
	String string_a = To16Bit("Test with multiple 字体 ", 22);
	String string_b = To16Bit("and 本書.", 7);
	TextDirection direction = TextDirection::kLtr;

	HarfBuzzShaper shaper_a(string_a);
	scoped_refptr<const ShapeResult> result_a = shaper_a.Shape(&font, direction);
	HarfBuzzShaper shaper_b(string_b);
	scoped_refptr<const ShapeResult> result_b = shaper_b.Shape(&font, direction);

	String reference_string = To16Bit("Test with multiple 字体 and 本書.", 29);
	HarfBuzzShaper reference_shaper(reference_string);
	scoped_refptr<const ShapeResult> reference_result =
	reference_shaper.Shape(&font, direction);

	// Create a copy using CopyRange and compare with that to ensure that the same
	// fonts are used for both the composite and the reference. The combined
	// reference_result data might use different fonts, resulting in different
	// glyph ids and metrics.
	scoped_refptr<ShapeResult> composite_copy =
	ShapeResult::Create(&font, 0, 0, direction);
	result_a->CopyRange(0, 22, composite_copy.get());
	result_b->CopyRange(0, 7, composite_copy.get());
	EXPECT_EQ(composite_copy->NumCharacters(), reference_result->NumCharacters());
	EXPECT_EQ(composite_copy->NumGlyphs(), reference_result->NumGlyphs());
	Vector<ShapeResultTestGlyphInfo> reference_glyphs;
	composite_copy->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&reference_glyphs));

	ShapeResultView::Segment segments[4] = {{result_a.get(), 0, 22},
	{result_b.get(), 0, 7}};
	auto composite_view = ShapeResultView::Create(&segments[0], 2);

	EXPECT_EQ(composite_view->StartIndex(), 0u);
	EXPECT_EQ(composite_view->NumCharacters(), reference_result->NumCharacters());
	EXPECT_EQ(composite_view->NumGlyphs(), reference_result->NumGlyphs());

	Vector<ShapeResultTestGlyphInfo> composite_glyphs;
	composite_view->ForEachGlyph(0, AddGlyphInfo,
	static_cast<void*>(&composite_glyphs));
	EXPECT_TRUE(CompareResultGlyphs(composite_glyphs, reference_glyphs, 0u,
	reference_glyphs.size()));
	EXPECT_EQ(composite_view->Width(), composite_copy->Width());
	}

	TEST_F(ShapeResultViewTest, TrimEndOfView) {
	String string = To16Bit("12345678901234567890", 20);
	TextDirection direction = TextDirection::kLtr;
	HarfBuzzShaper shaper(string);
	scoped_refptr<const ShapeResult> result = shaper.Shape(&font, direction);

	// Create a view from 5 to 20.
	scoped_refptr<const ShapeResultView> view1 =
	ShapeResultView::Create(result.get(), 5, 20);
	EXPECT_EQ(view1->NumCharacters(), 15u);
	EXPECT_EQ(view1->NumGlyphs(), 15u);

	// Trim the last character from the view.
	scoped_refptr<const ShapeResultView> view2 =
	ShapeResultView::Create(view1.get(), 5, 19);
	EXPECT_EQ(view2->NumCharacters(), 14u);
	EXPECT_EQ(view2->NumGlyphs(), 14u);
	}

	} // namespace blink