Untitled

for (const HorizontalTextLayouter::Data &d : textLayouter.data) {
    if (d.text.empty()) {
        continue;
    }

    Ref fontRef;
    // If it's an INVALID ref then we stick to our original font
    if (d.fontRef.gen == -1 && d.fontRef.num == -1) {
        font->getEmbeddedFontID(&fontRef);
    } else {
        fontRef = d.fontRef;
    }

    FontSubsetter *fontSubsetter = doc->getFontSubsetter();

    char byte1 = d.text.at(0);
    char byte2 = d.text.at(1);

    if (byte1 == 0) {
        // ASCII normal width character
        fontSubsetter->addEntry(fontRef, byte2);
    } else {
        // Unicode double width character
        uint32_t unicodeChar = 0;

        // starting from left of the binary representation
        // first 8 bits are copied from byte2
        // next 8 bits are from byte1
        for (int i = 0; i < 8; i++) {
            if (byte2 & (1 << i)) {
                unicodeChar |= (1 << i);
            }
        }
        for (int i = 0; i < 8; i++) {
            if (byte1 & (1 << i)) {
                unicodeChar |= (1 << (i + 8));
            }
        }

        fontSubsetter->addEntry(fontRef, unicodeChar);
    }
}