private static QImage warpImage(QImage src, int warp, int sign) {
int w = src.width();
int ppl = src.bytesPerLine() / 4;
int srch = src.height();
int desth = srch + warp;
QImage dest = new QImage(w, desth, QImage.Format.Format_ARGB32_Premultiplied);
dest.fill(0);
QNativePointer sbits = src.bits();
QNativePointer dbits = dest.bits();
sbits.setVerificationEnabled(false);
dbits.setVerificationEnabled(false);
double r = w / 2.0;
int extra_offset = sign >= 0 ? 0 : warp;
for (int x = 0; x < w; ++x) {
int oset = (int) (((Math.sqrt(Math.abs(r * r - (x - r) * (x - r)))) * sign / r) * warp);
for (int y = 0; y < srch; ++y) {
int p = sbits.intAt(y * ppl + x);
dbits.setIntAt(((y + oset + extra_offset) * ppl) + x, p);
}
}
return dest;
}
