Table table = loadTable("viewport.csv", "header");

size(2500, 2500);

background(0);

for (TableRow row : table.rows()) {
  int count = row.getInt("count");
  int width = row.getInt("width");
  int height = row.getInt("height");
  stroke( 255.0, min( 255.0, (log( float( count ) ) / 4.8) * 255.0), 0.0 );
  point(width, height);
}

save("viewport heatmap.png");