Support Hanb script.

Hanb is a union of Han and Bopomofo.

Bug: 26687969
Change-Id: Ic696bcbbc9607f3842fd0115668b8e7bd917e62b

libs/minikin/FontLanguage.cpp

@@ -61,9 +61,16 @@ FontLanguage::FontLanguage(const char* buf, size_t length) : FontLanguage() {
 uint8_t FontLanguage::scriptToSubScriptBits(uint32_t script) {
     uint8_t subScriptBits = 0u;
     switch (script) {
+        case SCRIPT_TAG('B', 'o', 'p', 'o'):
+            subScriptBits = kBopomofoFlag;
+            break;
         case SCRIPT_TAG('H', 'a', 'n', 'g'):
             subScriptBits = kHangulFlag;
             break;
+        case SCRIPT_TAG('H', 'a', 'n', 'b'):
+            // Bopomofo is almost exclusively used in Taiwan.
+            subScriptBits = kHanFlag | kBopomofoFlag;
+            break;
         case SCRIPT_TAG('H', 'a', 'n', 'i'):
             subScriptBits = kHanFlag;
             break;

libs/minikin/FontLanguage.h

@@ -68,14 +68,15 @@ private:
     // mLanguage = 0 means the FontLanguage is unsupported.
     uint32_t mLanguage;
 
-    // For faster comparing, use 7 bits for specific scripts.
-    static const uint8_t kEmojiFlag = 1u;
-    static const uint8_t kHanFlag = 1u << 1;
-    static const uint8_t kHangulFlag = 1u << 2;
-    static const uint8_t kHiraganaFlag = 1u << 3;
-    static const uint8_t kKatakanaFlag = 1u << 4;
-    static const uint8_t kSimplifiedChineseFlag = 1u << 5;
-    static const uint8_t kTraditionalChineseFlag = 1u << 6;
+    // For faster comparing, use 8 bits for specific scripts.
+    static const uint8_t kBopomofoFlag = 1u;
+    static const uint8_t kEmojiFlag = 1u << 1;
+    static const uint8_t kHanFlag = 1u << 2;
+    static const uint8_t kHangulFlag = 1u << 3;
+    static const uint8_t kHiraganaFlag = 1u << 4;
+    static const uint8_t kKatakanaFlag = 1u << 5;
+    static const uint8_t kSimplifiedChineseFlag = 1u << 6;
+    static const uint8_t kTraditionalChineseFlag = 1u << 7;
     uint8_t mSubScriptBits;
 
     static uint8_t scriptToSubScriptBits(uint32_t script);

tests/FontFamilyTest.cpp

@@ -131,6 +131,7 @@ TEST_F(FontLanguageTest, ScriptMatchTest) {
         { "zh-Hani", "Hani", SUPPORTED },
         { "ko-Kore", "Kore", SUPPORTED },
         { "ko-Hang", "Hang", SUPPORTED },
+        { "zh-Hanb", "Hanb", SUPPORTED },
 
         // Japanese supports Hiragana, Katakanara, etc.
         { "ja-Jpan", "Hira", SUPPORTED },
@@ -142,6 +143,10 @@ TEST_F(FontLanguageTest, ScriptMatchTest) {
         // Chinese supports Han.
         { "zh-Hans", "Hani", SUPPORTED },
         { "zh-Hant", "Hani", SUPPORTED },
+        { "zh-Hanb", "Hani", SUPPORTED },
+
+        // Hanb supports Bopomofo.
+        { "zh-Hanb", "Bopo", SUPPORTED },
 
         // Korean supports Hangul.
         { "ko-Kore", "Hang", SUPPORTED },
@@ -176,12 +181,19 @@ TEST_F(FontLanguageTest, ScriptMatchTest) {
         // Kanji doesn't support Chinese, etc.
         { "zh-Hani", "Hant", NOT_SUPPORTED },
         { "zh-Hani", "Hans", NOT_SUPPORTED },
+        { "zh-Hani", "Hanb", NOT_SUPPORTED },
 
         // Hangul doesn't support Korean, etc.
         { "ko-Hang", "Kore", NOT_SUPPORTED },
         { "ko-Hani", "Kore", NOT_SUPPORTED },
         { "ko-Hani", "Hang", NOT_SUPPORTED },
         { "ko-Hang", "Hani", NOT_SUPPORTED },
+
+        // Han with botomofo doesn't support simplified Chinese, etc.
+        { "zh-Hanb", "Hant", NOT_SUPPORTED },
+        { "zh-Hanb", "Hans", NOT_SUPPORTED },
+        { "zh-Hanb", "Jpan", NOT_SUPPORTED },
+        { "zh-Hanb", "Kore", NOT_SUPPORTED },
     };
 
     for (auto testCase : testCases) {