Method resizeImage

core/src/processing/awt/ShimAWT.java:240–268

(PImage img, int w, int h)

  static public void resizeImage(PImage img, int w, int h) {  // ignore
    if (w <= 0 && h <= 0) {
      throw new IllegalArgumentException("width or height must be > 0 for resize");
    }

    if (w == 0) {  // Use height to determine relative size
      float diff = (float) h / (float) img.height;
      w = (int) (img.width * diff);
    } else if (h == 0) {  // Use the width to determine relative size
      float diff = (float) w / (float) img.width;
      h = (int) (img.height * diff);
    }

    BufferedImage bimg =
      shrinkImage((BufferedImage) img.getNative(), w*img.pixelDensity, h*img.pixelDensity);

    PImage temp = new PImageAWT(bimg);
    img.pixelWidth = temp.width;
    img.pixelHeight = temp.height;

    // Get the resized pixel array
    img.pixels = temp.pixels;

    img.width = img.pixelWidth / img.pixelDensity;
    img.height = img.pixelHeight / img.pixelDensity;

    // Mark the pixels array as altered
    img.updatePixels();
  }


  // Adapted from getFasterScaledInstance() method from page 111 of