Day: January 5, 2015

I was using cairo_rectangle() for drawing waterfall, but perhaps doing it with GDK-PixBuf is more efficient.

rowstride = gdk_pixbuf_get_rowstride (pixbuf);
for(int i=0;i<i_max;i++) {
 p = gdk_pixbuf_get_pixels(pixbuf) + i * rowstride;
 for(int j=0;j<j_max;j++) {
  double tmp = waterfall[i][j];
  *p++ = colormap_r(tmp);
  *p++ = colormap_g(tmp);
  *p++ = colormap_b(tmp);
 }
}

gdk_pixbuf_composite() is used with non 1.0 scaling factors to get a smooth image.