Function readContour

MyGUIEngine/src/msdfgen/core/shape-description.cpp:91–185

template <typename T, int (*readChar)(T *), int (*readCoord)(T *, Point2 &)>
static bool readContour(T *input, Contour &output, const Point2 *first, int terminator, bool &colorsSpecified) {
    Point2 p[4], start;
    if (first)
        p[0] = *first;
    else {
        int result = readCoord(input, p[0]);
        if (result != 2)
            return result != 1 && readChar(input) == terminator;
    }
    start = p[0];
    int c = '\0';
    while ((c = readChar(input)) != terminator) {
        if (c != ';')
            return false;
        EdgeColor color = WHITE;
        int result = readCoord(input, p[1]);
        if (result == 2) {
            output.addEdge(EdgeHolder(p[0], p[1], color));
            p[0] = p[1];
            continue;
        } else if (result == 1)
            return false;
        else {
            int controlPoints = 0;
            switch ((c = readChar(input))) {
                case '#':
                    output.addEdge(EdgeHolder(p[0], start, color));
                    p[0] = start;
                    continue;
                case ';':
                    goto FINISH_EDGE;
                case '(':
                    goto READ_CONTROL_POINTS;
                case 'C': case 'c':
                    color = CYAN;
                    colorsSpecified = true;
                    break;
                case 'M': case 'm':
                    color = MAGENTA;
                    colorsSpecified = true;
                    break;
                case 'Y': case 'y':
                    color = YELLOW;
                    colorsSpecified = true;
                    break;
                case 'W': case 'w':
                    color = WHITE;
                    colorsSpecified = true;
                    break;
                default:
                    return c == terminator;
            }
            switch (readChar(input)) {
                case ';':
                    goto FINISH_EDGE;
                case '(':
                READ_CONTROL_POINTS:
                    if ((controlPoints = readControlPoints<T, readChar, readCoord>(input, p+1)) < 0)