Processingでwidthとheightで大きい方にあわせる

PImage img;
void setup() {
  size(800, 300);
  img = loadImage("IMG_0266.jpg");
  float w, h;
  if (img.width>img.height) {
    w = (float)width;
    h = (float)width/img.width*img.height;
  }
  else {
    w = (float)height/img.height*img.width;
    h = (float)height;
  }
  image(img, 0, 0, w, h);
}