void replace()

in libs/screen/image.cpp [586:614]

• 25 lines of code
• 11 McCabe index (conditional complexity)

void replace(Image_ img, int from, int to) {
    if (img->bpp() != 4)
        return;
    to &= 0xf;
    if (from == to)
        return;

    img->makeWritable();

    // avoid bleeding 'to' color into the overflow areas of the picture
    if (from == 0 && img->hasPadding()) {
        for (int i = 0; i < img->height(); ++i)
            for (int j = 0; j < img->width(); ++j)
                if (getCore(img, j, i) == from)
                    setCore(img, j, i, to);
        return;
    }

    auto ptr = img->pix();
    auto len = img->pixLength();
    while (len--) {
        auto b = *ptr;
        if ((b & 0xf) == from)
            b = (b & 0xf0) | to;
        if ((b >> 4) == from)
            b = (to << 4) | (b & 0xf);
        *ptr++ = b;
    }
}