Method checkAlpha

core/src/processing/core/PImage.java:273–284

Check the alpha on an image, using a really primitive loop.

()

   * Check the alpha on an image, using a really primitive loop.
   */
  protected void checkAlpha() {
    if (pixels == null) return;

    for (int i = 0; i < pixels.length; i++) {
      // since transparency is often at corners, hopefully this
      // will find a non-transparent pixel quickly and exit
      if ((pixels[i] & 0xff000000) != 0xff000000) {
        format = ARGB;
        break;
      }
    }
  }


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