GH-118 Internal Error workaround (#119)

core/core-awt/src/main/java/org/icepdf/core/pobjects/annotations/Annotation.java

@@ -30,8 +30,8 @@
 import java.awt.geom.*;
 import java.beans.PropertyChangeListener;
 import java.beans.PropertyChangeSupport;
-import java.util.*;
 import java.util.List;
+import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 

core/core-awt/src/main/java/org/icepdf/core/pobjects/graphics/BlendComposite.java

@@ -50,6 +50,9 @@
 import java.awt.image.DataBuffer;
 import java.awt.image.Raster;
 import java.awt.image.WritableRaster;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.util.logging.Logger;
 
 public final class BlendComposite implements Composite {
@@ -98,8 +101,38 @@ public enum BlendingMode {
  private static boolean disableBlendComposite;
 
  static {
+ // sets the shadow colour of the decorator.
  disableBlendComposite = Defs.booleanProperty(
  "org.icepdf.core.paint.disableBlendComposite", false);
+
+ /*
+ Check for XRSurfaceData.XRInternalSurfaceData.getRaster implementation
+ On Linux, the implementation simply returns InternalError
+ We have to preventatively disable it, otherwise it will cause an InternalError when annotations using
+ BlendComposite are rendered
+ */
+ try {
+ final Class xrSurfaceDataClass = Class.forName("sun.java2d.xr.XRSurfaceData$XRInternalSurfaceData");
+ final Constructor constructor = xrSurfaceDataClass.getDeclaredConstructor(Class.forName("sun.java2d.xr.XRBackend"), int.class);
+ final Object xrSurfaceData = constructor.newInstance(null, 0);
+ final Method getRaster = xrSurfaceDataClass.getMethod("getRaster", int.class, int.class, int.class, int.class);
+ getRaster.invoke(xrSurfaceData, 0, 0, 0, 0);
+ } catch (final InvocationTargetException e) {
+ if (e.getCause() instanceof InternalError) {
+ disableBlendComposite = true;
+ }
+ /*
+ If there is another cause, this means that getRaster implementation is not simply "throw
+ new InternalError()", in which case this implementation may perfectly work with real values.
+ */
+ } catch (final InternalError e) {
+ disableBlendComposite = true;
+ } catch (final Exception ignored) {
+ /*
+ If there are other exceptions (NoSuchClass, NoSuchMethod, etc), this probably means that the api changed
+ or that java2d.xr is not available, in which case the blend composite rendering could work perfectly.
+ */
+ }
  }
 
  public static final Name NORMAL_VALUE = new Name("Normal");