Unicode Variation Selectors support in collectCandidateRuns

Source/platform/fonts/shaping/HarfBuzzShaperTest.cpp

 // Copyright (c) 2014 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 "config.h"
 #include "platform/fonts/shaping/HarfBuzzShaper.h"
 
 #include "platform/fonts/Font.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/GlyphPage.h"
@@ skipping 49 matching lines @@
     HarfBuzzShaper shaper(font, leadingCommon);
     shaper.shape();
 
     ASSERT_EQ(shaper.numberOfRunsForTesting(), 1u);
     ASSERT_EQ(shaper.runInfoForTesting(0, startIndex, numGlyphs, script), true);
     ASSERT_EQ(startIndex, 0u);
     ASSERT_EQ(numGlyphs, 8u);
     ASSERT_EQ(script, HB_SCRIPT_LATIN);
 }
 
+TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsUnicodeVariants)
+{
+    struct {
+        const char* name;
+        UChar string[4];
+        hb_script_t script;
+    } testlist[] = {
+        { "Standard Variants text style", { 0x30, 0xFE0E }, HB_SCRIPT_COMMON },
+        { "Standard Variants emoji style", { 0x203C, 0xFE0F }, HB_SCRIPT_COMMON },
+        { "Standard Variants of Ideograph", { 0x4FAE, 0xFE00 }, HB_SCRIPT_HAN },
+        { "Ideographic Variants", { 0x3402, 0xDB40, 0xDD00 }, HB_SCRIPT_HAN },
+        { "Not-defined Variants", { 0x41, 0xDB40, 0xDDEF }, HB_SCRIPT_LATIN },
+    };
+    for (auto& test : testlist) {
+        String str(test.string);
+        TextRun run(str);
+        HarfBuzzShaper shaper(font, run);
+        shaper.shape();
+        EXPECT_EQ(1u, shaper.numberOfRunsForTesting()) << test.name;
+        ASSERT_TRUE(shaper.runInfoForTesting(0, startIndex, numGlyphs, script)) << test.name;
+        EXPECT_EQ(0u, startIndex) << test.name;
+        // TODO(kojii): HarfBuzzFace does not support UVS yet and numGlyphs becomes 2
+        // EXPECT_EQ(1u, numGlyphs) << test.name;
+        EXPECT_EQ(test.script, script) << test.name;
+    }
+}
+
 TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsDevanagariCommon)
 {
     UChar devanagariCommonString[] = { 0x915, 0x94d, 0x930, 0x28, 0x20, 0x29 };
     TextRun devanagariCommonLatin(devanagariCommonString, 6);
     HarfBuzzShaper shaper(font, devanagariCommonLatin);
     shaper.shape();
 
     ASSERT_EQ(shaper.numberOfRunsForTesting(), 2u);
     ASSERT_EQ(shaper.runInfoForTesting(0, startIndex, numGlyphs, script), true);
     ASSERT_EQ(startIndex, 0u);
@@ skipping 67 matching lines @@
     shaper.shape();
 
     ASSERT_EQ(shaper.numberOfRunsForTesting(), 1u);
     ASSERT_EQ(shaper.runInfoForTesting(0, startIndex, numGlyphs, script), true);
     ASSERT_EQ(startIndex, 0u);
     ASSERT_EQ(numGlyphs, 3u);
     ASSERT_EQ(script, HB_SCRIPT_ARABIC);
 }
 
 }