SkShapers::unicode Namespace Reference

Functions
SKSHAPER_API std::unique_ptr< SkShaper::BiDiRunIterator >	BidiRunIterator (sk_sp< SkUnicode > unicode, const char *utf8, size_t utf8Bytes, uint8_t bidiLevel)

Function Documentation

BidiRunIterator()

std::unique_ptr< SkShaper::BiDiRunIterator > SkShapers::unicode::BidiRunIterator	(	sk_sp< SkUnicode >	unicode,
		const char *	utf8,
		size_t	utf8Bytes,
		uint8_t	bidiLevel
	)

Definition at line 120 of file SkShaper_skunicode.cpp.

                                                                              {
    if (!unicode) {
        return nullptr;
    }
    // ubidi only accepts utf16 (though internally it basically works on utf32 chars).
    // We want an ubidi_setPara(UBiDi*, UText*, UBiDiLevel, UBiDiLevel*, UErrorCode*);
    if (!SkTFitsIn<int32_t>(utf8Bytes)) {
        SkDEBUGF("Bidi error: text too long");
        return nullptr;
    }
 
    int32_t utf16Units = SkUTF::UTF8ToUTF16(nullptr, 0, utf8, utf8Bytes);
    if (utf16Units < 0) {
        SkDEBUGF("Invalid utf8 input\n");
        return nullptr;
    }
 
    std::unique_ptr<uint16_t[]> utf16(new uint16_t[utf16Units]);
    (void)SkUTF::UTF8ToUTF16(utf16.get(), utf16Units, utf8, utf8Bytes);
 
    auto bidiDir = (bidiLevel % 2 == 0) ? SkBidiIterator::kLTR : SkBidiIterator::kRTL;
    SkUnicodeBidi bidi = unicode->makeBidiIterator(utf16.get(), utf16Units, bidiDir);
    if (!bidi) {
        SkDEBUGF("Bidi error\n");
        return nullptr;
    }
 
    return std::make_unique<SkUnicodeBidiRunIterator>(utf8, utf8 + utf8Bytes, std::move(bidi));
}