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;
}
@Override
protected void resizeEvent(QResizeEvent event) {
if (width() > image.width() || height() > image.height()) {
int newWidth = Math.max(width() + 128, image.width());
int newHeight = Math.max(height() + 128, image.height());
image = resizeImage(image, new QSize(newWidth, newHeight));
update();
}
super.resizeEvent(event);
}
public SmokeEffect(int width, int height) {
m_width = width;
m_height = height;
m_seeds = new int[16000];
for (int i = 0; i < m_seeds.length; ++i) {
double d = Math.random();
m_seeds[i] = (int) (d * 255);
}
m_image = new QImage(width, height, QImage.Format.Format_ARGB32_Premultiplied);
m_image.fill(0);
m_data = new int[m_width * (m_height + 1)];
seedLastRow();
}