Refactor HarfBuzzShaper to not retain font data

third_party/WebKit/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 "platform/fonts/shaping/HarfBuzzShaper.h"
 
 #include "platform/fonts/Font.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/shaping/ShapeResultTestInfo.h"
 #include "platform/text/TextRun.h"
@@ skipping 20 matching lines @@
   unsigned numGlyphs = 0;
   hb_script_t script = HB_SCRIPT_INVALID;
 };
 
 static inline ShapeResultTestInfo* testInfo(RefPtr<ShapeResult>& result) {
   return static_cast<ShapeResultTestInfo*>(result.get());
 }
 
 TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsLatin) {
   TextRun latinCommon(reinterpret_cast<const LChar*>("ABC DEF."), 8);
-  HarfBuzzShaper shaper(&font, latinCommon);
-  RefPtr<ShapeResult> result = shaper.shapeResult();
+  HarfBuzzShaper shaper(latinCommon);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
   ASSERT_EQ(1u, testInfo(result)->numberOfRunsForTesting());
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script));
   EXPECT_EQ(0u, startIndex);
   EXPECT_EQ(8u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_LATIN, script);
 }
 
 TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsLeadingCommon) {
   TextRun leadingCommon(reinterpret_cast<const LChar*>("... test"), 8);
-  HarfBuzzShaper shaper(&font, leadingCommon);
-  RefPtr<ShapeResult> result = shaper.shapeResult();
+  HarfBuzzShaper shaper(leadingCommon);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
   ASSERT_EQ(1u, testInfo(result)->numberOfRunsForTesting());
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script));
   EXPECT_EQ(0u, startIndex);
   EXPECT_EQ(8u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_LATIN, script);
 }
 
 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);
-    RefPtr<ShapeResult> result = shaper.shapeResult();
+    HarfBuzzShaper shaper(run);
+    RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
     EXPECT_EQ(1u, testInfo(result)->numberOfRunsForTesting()) << test.name;
     ASSERT_TRUE(
         testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script))
         << test.name;
     EXPECT_EQ(0u, startIndex) << test.name;
     if (numGlyphs == 2) {
 // If the specified VS is not in the font, it's mapped to .notdef.
 // then hb_ot_hide_default_ignorables() swaps it to a space with zero-advance.
 // http://lists.freedesktop.org/archives/harfbuzz/2015-May/004888.html
 // OpenType recommends Glyph ID 3 for a space; not a hard requirement though.
 // https://www.microsoft.com/typography/otspec/recom.htm
 #if !OS(MACOSX)
       EXPECT_EQ(3u, testInfo(result)->glyphForTesting(0, 1)) << test.name;
 #endif
       EXPECT_EQ(0.f, testInfo(result)->advanceForTesting(0, 1)) << test.name;
     } else {
       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);
-  RefPtr<ShapeResult> result = shaper.shapeResult();
+  HarfBuzzShaper shaper(devanagariCommonLatin);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
   ASSERT_EQ(2u, testInfo(result)->numberOfRunsForTesting());
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script));
   EXPECT_EQ(0u, startIndex);
   EXPECT_EQ(1u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_DEVANAGARI, script);
 
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(1, startIndex, numGlyphs, script));
   EXPECT_EQ(3u, startIndex);
   EXPECT_EQ(3u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_DEVANAGARI, script);
 }
 
 TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsDevanagariCommonLatinCommon) {
   UChar devanagariCommonLatinString[] = {0x915, 0x94d, 0x930, 0x20,
                                          0x61,  0x62,  0x2E};
   TextRun devanagariCommonLatin(devanagariCommonLatinString, 7);
-  HarfBuzzShaper shaper(&font, devanagariCommonLatin);
-  RefPtr<ShapeResult> result = shaper.shapeResult();
+  HarfBuzzShaper shaper(devanagariCommonLatin);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
   ASSERT_EQ(3u, testInfo(result)->numberOfRunsForTesting());
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script));
   EXPECT_EQ(0u, startIndex);
   EXPECT_EQ(1u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_DEVANAGARI, script);
 
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(1, startIndex, numGlyphs, script));
   EXPECT_EQ(3u, startIndex);
   EXPECT_EQ(1u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_DEVANAGARI, script);
 
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(2, startIndex, numGlyphs, script));
   EXPECT_EQ(4u, startIndex);
   EXPECT_EQ(3u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_LATIN, script);
 }
 
 TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsArabicThaiHanLatin) {
   UChar mixedString[] = {0x628, 0x64A, 0x629, 0xE20, 0x65E5, 0x62};
   TextRun mixed(mixedString, 6);
-  HarfBuzzShaper shaper(&font, mixed);
-  RefPtr<ShapeResult> result = shaper.shapeResult();
+  HarfBuzzShaper shaper(mixed);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
   ASSERT_EQ(4u, testInfo(result)->numberOfRunsForTesting());
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script));
   EXPECT_EQ(0u, startIndex);
   EXPECT_EQ(3u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_ARABIC, script);
 
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(1, startIndex, numGlyphs, script));
   EXPECT_EQ(3u, startIndex);
   EXPECT_EQ(1u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_THAI, script);
 
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(2, startIndex, numGlyphs, script));
   EXPECT_EQ(4u, startIndex);
   EXPECT_EQ(1u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_HAN, script);
 
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(3, startIndex, numGlyphs, script));
   EXPECT_EQ(5u, startIndex);
   EXPECT_EQ(1u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_LATIN, script);
 }
 
+TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsArabicThaiHanLatinTwice) {
+  UChar mixedString[] = {0x628, 0x64A, 0x629, 0xE20, 0x65E5, 0x62};
+  TextRun mixed(mixedString, 6);
+  HarfBuzzShaper shaper(mixed);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
+  ASSERT_EQ(4u, testInfo(result)->numberOfRunsForTesting());
+
+  // Shape again on the same shape object and check the number of runs.
+  // Should be equal if no state was retained between shape calls.
+  RefPtr<ShapeResult> result2 = shaper.shapeResult(&font);
+  ASSERT_EQ(4u, testInfo(result2)->numberOfRunsForTesting());
+}
+
 TEST_F(HarfBuzzShaperTest, ResolveCandidateRunsArabic) {
   UChar arabicString[] = {0x628, 0x64A, 0x629};
   TextRun arabic(arabicString, 3);
-  HarfBuzzShaper shaper(&font, arabic);
-  RefPtr<ShapeResult> result = shaper.shapeResult();
+  HarfBuzzShaper shaper(arabic);
+  RefPtr<ShapeResult> result = shaper.shapeResult(&font);
 
   ASSERT_EQ(1u, testInfo(result)->numberOfRunsForTesting());
   ASSERT_TRUE(
       testInfo(result)->runInfoForTesting(0, startIndex, numGlyphs, script));
   EXPECT_EQ(0u, startIndex);
   EXPECT_EQ(3u, numGlyphs);
   EXPECT_EQ(HB_SCRIPT_ARABIC, script);
 }
 
 }  // namespace blink