src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGMetadata.java

*** 1,7 ****
  /*
!  * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 2257,2266 ****
--- 2257,2272 ----
              }
          }
          return retVal;
      }
  
+     boolean hasTransparentColor() {
+         return tRNS_present &&
+                (tRNS_colorType == PNGImageReader.PNG_COLOR_RGB ||
+                tRNS_colorType == PNGImageReader.PNG_COLOR_GRAY);
+     }
+ 
      // Reset all instance variables to their initial state
      public void reset() {
          IHDR_present = false;
          PLTE_present = false;
          bKGD_present = false;