Merge "Fix bug #5559439 Bogus tab title in browser"

    // Get the glyphs base count for offsetting the glyphIDs returned by Harfbuzz

    // This is needed as the Typeface used for shaping can be not the default one

    // when we are shapping any script that needs to use a fallback Font

    // when we are shapping any script that needs to use a fallback Font.

    // If we are a "common" script we dont need to shift

    unsigned result = 0;

    switch(shaperItem.item.script) {

        case HB_Script_Arabic:

        case HB_Script_Hebrew:

            const uint16_t* text16 = (const uint16_t*)shaperItem.string;

    unsigned result = paint->getBaseGlyphCount(SkUTF16_NextUnichar(&text16));

            SkUnichar firstUnichar = SkUTF16_NextUnichar(&text16);

            result = paint->getBaseGlyphCount(firstUnichar);

            break;

    }

    // Set the correct Typeface depending on the script

    FontData* data = reinterpret_cast<FontData*>(shaperItem.font->userData);

            LOGD("Using Default Typeface");

#endif

            }

            break;

    }

    shaperItem.face = HB_NewFace(data, harfbuzzSkiaGetTable);

    return result;

}

HB_Script TextLayoutCacheValue::getScriptFromRun(const UChar* chars, size_t start, size_t count,

        bool isRTL) {

    ssize_t nextCodePoint = 0;

    uint32_t codePoint = utf16_to_code_point(chars + start, count, &nextCodePoint);

    HB_Script script = code_point_to_script(codePoint);

    if (script == HB_Script_Inherited) {

#if DEBUG_GLYPHS

         LOGD("Cannot find a correct script for code point=%d "

                 " Need to look at the next code points.", codePoint);

#endif

         while (script == HB_Script_Inherited && nextCodePoint < count) {

             codePoint = utf16_to_code_point(chars, count, &nextCodePoint);

             script = code_point_to_script(codePoint);

        }

    }

    if (script == HB_Script_Inherited) {

#if DEBUG_GLYPHS

        LOGD("Cannot find a correct script from the text."

                " Need to select a default script depending on the passed text direction.");

#endif

        script = isRTL ? HB_Script_Arabic : HB_Script_Common;

    }

#if DEBUG_GLYPHS

    LOGD("Found script=%d for chars='%s'", script, String8(chars + start, count).string());

#endif

    return script;

}

void TextLayoutCacheValue::computeValuesWithHarfbuzz(SkPaint* paint, const UChar* chars,

        size_t start, size_t count, size_t contextCount, int dirFlags,

        Vector<jfloat>* const outAdvances, jfloat* outTotalAdvance,

    static unsigned shapeFontRun(HB_ShaperItem& shaperItem, SkPaint* paint,

            size_t count, bool isRTL);

    static HB_Script getScriptFromRun(const UChar* chars, size_t start, size_t count,

            bool isRTL);

    static void deleteGlyphArrays(HB_ShaperItem& shaperItem);

    static void createGlyphArrays(HB_ShaperItem& shaperItem, int size);