Test: Don't resize frame, tweek print-matrix; AWTPrintLifecycle: Add scale and convenient AWT container traversal context; GLCanvas/GLJPanel properly handle existing MSAA and req. AA;

- Test: Don't resize frame, tweek print-matrix
  - Use scaleComp72 to scale the frame to fit on page,
    i.e. global print matrix

  - Use scaleGLMatXY = 72.0 / glDPI
    to locally scale on the GL drawable as being passed to AWTPrintLifecycle.setup(..)

  - Hence frame stays untouched/stable, no need for 'offscreen' print test,
    which is removed.

- AWTPrintLifecycle: Add scale and convenient AWT container traversal context
  Use a simple decoration for all AWTPrintLifecycle impl. components within a container:

    final AWTPrintLifecycle.Context ctx = AWTPrintLifecycle.Context.setupPrint(frame, g2d, scaleGLMatXY, scaleGLMatXY);
    try {
    } finally {
       ctx.releasePrint();
    }

- GLCanvas/GLJPanel properly handle existing MSAA and req. AA;
  - GLCanvas: Workaround bug where onscreen MSAA cannot switch to offscreen FBO,
              i.e. stay 'onscreen'
  - GLJPanel: Use new offscreen FBO if MSAA is requested and not yet used.

- GLJPanel.Offscreen.postGL(): always swapBufer(), was missing for !GLSL swapping

Results GLCanvas / GLJPanel:
  - Good scaling
  - Stable behavior / visibility
  - High DPI mode works

4 files changed, 218 insertions, 90 deletions

diff --git a/src/jogl/classes/javax/media/opengl/awt/AWTPrintLifecycle.java b/src/jogl/classes/javax/media/opengl/awt/AWTPrintLifecycle.java
index 077ee42a9..293bdb809 100644
--- a/src/jogl/classes/javax/media/opengl/awt/AWTPrintLifecycle.java
+++ b/src/jogl/classes/javax/media/opengl/awt/AWTPrintLifecycle.java
@@ -29,9 +29,12 @@ package javax.media.opengl.awt;
 
 import javax.media.opengl.GLAutoDrawable;
 import java.awt.Component;
+import java.awt.Container;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 
+import jogamp.nativewindow.awt.AWTMisc;
+
 /**
  * Interface describing print lifecycle to support AWT printing
  * on AWT {@link GLAutoDrawable}s.
@@ -41,11 +44,55 @@ public interface AWTPrintLifecycle {
     /**
      * Shall be called before {@link Component#print(Graphics)}.
      * @param g2d the {@link Graphics2D} instance, which will be used for printing.
+     * @param scaleMatX {@link Graphics2D} {@link Graphics2D#scale(double, double) scaling factor}, i.e. rendering 1/scaleMatX * width pixels
+     * @param scaleMatY {@link Graphics2D} {@link Graphics2D#scale(double, double) scaling factor}, i.e. rendering 1/scaleMatY * height pixels
      */
-    void setupPrint(Graphics2D g2d);
+    void setupPrint(Graphics2D g2d, double scaleMatX, double scaleMatY);
     
     /**
      * Shall be called after very last {@link Component#print(Graphics)}.
      */
     void releasePrint();
+
+    public static class Context {
+        public static Context setupPrint(Container c, Graphics2D g2d, double scaleMatX, double scaleMatY) {
+            final Context t = new Context(c, g2d, scaleMatX, scaleMatY);
+            t.setupPrint(c);
+            return t;
+        }
+
+        public void releasePrint() {
+            count = AWTMisc.performAction(cont, AWTPrintLifecycle.class, releaseAction);
+        }
+        
+        public int getCount() { return count; }
+        
+        private final Container cont;
+        private final Graphics2D g2d;
+        private final double scaleMatX;
+        private final double scaleMatY;
+        private int count;
+        
+        private final AWTMisc.ComponentAction setupAction = new AWTMisc.ComponentAction() {
+            @Override
+            public void run(Component c) {
+                ((AWTPrintLifecycle)c).setupPrint(g2d, scaleMatX, scaleMatY);
+            } };
+        private final AWTMisc.ComponentAction releaseAction = new AWTMisc.ComponentAction() {
+            @Override
+            public void run(Component c) {
+                ((AWTPrintLifecycle)c).releasePrint();
+            } };
+
+        private Context(Container c, Graphics2D g2d, double scaleMatX, double scaleMatY) {
+            this.cont = c;
+            this.g2d = g2d;
+            this.scaleMatX = scaleMatX;
+            this.scaleMatY = scaleMatY;
+            this.count = 0;
+        }
+        private void setupPrint(Container c) {
+            count = AWTMisc.performAction(c, AWTPrintLifecycle.class, setupAction);
+        }
+    }
 }
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
index 8f9684db1..b2ffc17a2 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
@@ -86,7 +86,6 @@ import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLDrawableFactory;
 import javax.media.opengl.GLEventListener;
 import javax.media.opengl.GLException;
-import javax.media.opengl.GLOffscreenAutoDrawable;
 import javax.media.opengl.GLProfile;
 import javax.media.opengl.GLRunnable;
 import javax.media.opengl.Threading;
@@ -733,11 +732,11 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
   private volatile boolean printActive = false;
   private boolean printUseAA = false;
   private GLAnimatorControl printAnimator = null; 
-  private GLOffscreenAutoDrawable printGLAD = null;
+  private GLAutoDrawable printGLAD = null;
   private AWTTilePainter printAWTTiles = null;
   
   @Override
-  public void setupPrint(Graphics2D g2d) {
+  public void setupPrint(Graphics2D g2d, double scaleMatX, double scaleMatY) {
       if( !validateGLDrawable() ) {
           if(DEBUG) {
               System.err.println(getThreadName()+": Info: GLCanvas setupPrint - skipped GL render, drawable not valid yet");
@@ -758,7 +757,7 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
           printUseAA = null != _useAA && ( _useAA == RenderingHints.VALUE_ANTIALIAS_DEFAULT || _useAA == RenderingHints.VALUE_ANTIALIAS_ON );
       }
       if( DEBUG ) {
-          System.err.println("AWT print.setup: canvasSize "+getWidth()+"x"+getWidth()+", useAA "+printUseAA+", printAnimator "+printAnimator);
+          System.err.println("AWT print.setup: canvasSize "+getWidth()+"x"+getWidth()+", scaleMat "+scaleMatX+" x "+scaleMatY+", useAA "+printUseAA+", printAnimator "+printAnimator);
           {
               final Set<Entry<Object, Object>> rEntries = rHints.entrySet();
               int count = 0;
@@ -770,7 +769,10 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
           final AffineTransform aTrans = g2d.getTransform();
           System.err.println(" scale "+aTrans.getScaleX()+" x "+aTrans.getScaleY());
           System.err.println(" move "+aTrans.getTranslateX()+" x "+aTrans.getTranslateY());
-      }      
+      }
+      final int componentCount = isOpaque() ? 3 : 4;
+      final TileRenderer printRenderer = new TileRenderer();
+      printAWTTiles = new AWTTilePainter(printRenderer, componentCount, scaleMatX, scaleMatY, DEBUG);
       AWTEDTExecutor.singleton.invoke(getTreeLock(), true /* allowOnNonEDT */, true /* wait */, setupPrintOnEDT);
   }
   private final Runnable setupPrintOnEDT = new Runnable() {
@@ -782,30 +784,31 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
               printAnimator.remove(GLCanvas.this);
           }
           final GLCapabilities caps = (GLCapabilities)getChosenGLCapabilities().cloneMutable();
-          caps.setDoubleBuffered(false);
           final GLProfile glp = caps.getGLProfile();
-          if( printUseAA && !caps.getSampleBuffers() ) {
-              if ( !glp.isGL2ES3() ) {
-                  if( DEBUG ) {
-                      System.err.println("Ignore MSAA due to gl-profile < GL2ES3");
+          if( caps.getSampleBuffers() ) {
+              // bug / issue w/ swapGLContextAndAllGLEventListener and onscreen MSAA w/ NV/GLX
+              printGLAD = GLCanvas.this;
+          } else {
+              caps.setDoubleBuffered(false);
+              caps.setOnscreen(false);
+              if( printUseAA && !caps.getSampleBuffers() ) {
+                  if ( !glp.isGL2ES3() ) {
+                      if( DEBUG ) {
+                          System.err.println("Ignore MSAA due to gl-profile < GL2ES3");
+                      }
+                      printUseAA = false;
+                  } else {
+                      caps.setSampleBuffers(true);
+                      caps.setNumSamples(8);
                   }
-                  printUseAA = false;
-              } else {
-                  caps.setSampleBuffers(true);
-                  caps.setNumSamples(8); // FIXME
               }
+              final GLDrawableFactory factory = GLDrawableFactory.getFactory(caps.getGLProfile());
+              printGLAD = factory.createOffscreenAutoDrawable(null, caps, null, PRINT_TILE_SIZE, PRINT_TILE_SIZE, null);
+              GLDrawableUtil.swapGLContextAndAllGLEventListener(GLCanvas.this, printGLAD);
           }
-          caps.setOnscreen(false);
-          final GLDrawableFactory factory = GLDrawableFactory.getFactory(caps.getGLProfile());
-          printGLAD = factory.createOffscreenAutoDrawable(null, caps, null, PRINT_TILE_SIZE, PRINT_TILE_SIZE, null);
-          GLDrawableUtil.swapGLContextAndAllGLEventListener(GLCanvas.this, printGLAD);
-          destroyOnEDTAction.run();
           
-          final int componentCount = isOpaque() ? 3 : 4;
-          final TileRenderer printRenderer = new TileRenderer();
-          printRenderer.setTileSize(printGLAD.getWidth(), printGLAD.getHeight(), 0);
-          printRenderer.attachToAutoDrawable(printGLAD);
-          printAWTTiles = new AWTTilePainter(printRenderer, componentCount, DEBUG);
+          printAWTTiles.renderer.setTileSize(printGLAD.getWidth(), printGLAD.getHeight(), 0);
+          printAWTTiles.renderer.attachToAutoDrawable(printGLAD);
           if( DEBUG ) {
               System.err.println("AWT print.setup "+printAWTTiles);
               System.err.println("AWT print.setup AA "+printUseAA+", "+caps);
@@ -832,9 +835,10 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
           }
           printAWTTiles.dispose();
           printAWTTiles= null;
-          createDrawableAndContext( false );
-          GLDrawableUtil.swapGLContextAndAllGLEventListener(printGLAD, GLCanvas.this);
-          printGLAD.destroy();
+          if( printGLAD != GLCanvas.this ) {
+              GLDrawableUtil.swapGLContextAndAllGLEventListener(printGLAD, GLCanvas.this);
+              printGLAD.destroy();
+          }
           printGLAD = null;
           if( null != printAnimator ) {
               printAnimator.add(GLCanvas.this);
@@ -854,17 +858,26 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
           // we cannot dispatch print on AWT-EDT due to printing internal locking ..
       }
       sendReshape = false; // clear reshape flag
-      final Graphics2D printGraphics = (Graphics2D)graphics;
-      printAWTTiles.updateGraphics2DAndClipBounds(printGraphics);
-      final TileRenderer tileRenderer = printAWTTiles.getTileRenderer(); 
-      if( DEBUG ) {
-          System.err.println("AWT print.0: "+tileRenderer);
+      
+      final Graphics2D g2d = (Graphics2D)graphics;
+      printAWTTiles.setupGraphics2DAndClipBounds(g2d);
+      try {
+          final TileRenderer tileRenderer = printAWTTiles.renderer;
+          if( DEBUG ) {
+              System.err.println("AWT print.0: "+tileRenderer);
+          }
+          do {
+              if( printGLAD != GLCanvas.this ) {
+                  tileRenderer.display();
+              } else {
+                  Threading.invoke(true, displayOnEDTAction, getTreeLock());
+              }
+          } while ( !tileRenderer.eot() );
+      } finally {
+          printAWTTiles.resetGraphics2D();
       }
-      do {
-          tileRenderer.display();
-      } while ( !tileRenderer.eot() );
       if( DEBUG ) {
-          System.err.println("AWT print.X: "+tileRenderer);
+          System.err.println("AWT print.X: "+printAWTTiles);
       }
   }
     
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
index 2488bd443..b549ad30c 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
@@ -98,6 +98,7 @@ import com.jogamp.nativewindow.awt.AWTWindowClosingProtocol;
 import com.jogamp.opengl.FBObject;
 import com.jogamp.opengl.util.GLPixelBuffer.GLPixelAttributes;
 import com.jogamp.opengl.util.GLPixelBuffer.SingletonGLPixelBufferProvider;
+import com.jogamp.opengl.util.GLDrawableUtil;
 import com.jogamp.opengl.util.GLPixelStorageModes;
 import com.jogamp.opengl.util.TileRenderer;
 import com.jogamp.opengl.util.awt.AWTGLPixelBuffer;
@@ -500,12 +501,15 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
     }
   }
 
+  private static final int PRINT_TILE_SIZE = 512;
   private volatile boolean printActive = false;
+  private boolean printUseAA = false;
   private GLAnimatorControl printAnimator = null; 
+  private GLAutoDrawable printGLAD = null;
   private AWTTilePainter printAWTTiles = null;
   
   @Override
-  public void setupPrint(Graphics2D g2d) {
+  public void setupPrint(Graphics2D g2d, double scaleMatX, double scaleMatY) {
       if (!isInitialized) {
           if(DEBUG) {
               System.err.println(getThreadName()+": Info: GLJPanel setupPrint - skipped GL render, drawable not valid yet");
@@ -521,6 +525,28 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
       printActive = true; 
       sendReshape = false; // clear reshape flag
       handleReshape = false; // ditto
+      final RenderingHints rHints = g2d.getRenderingHints();
+      {
+          final Object _useAA = rHints.get(RenderingHints.KEY_ANTIALIASING);
+          printUseAA = null != _useAA && ( _useAA == RenderingHints.VALUE_ANTIALIAS_DEFAULT || _useAA == RenderingHints.VALUE_ANTIALIAS_ON );
+      }
+      if( DEBUG ) {
+          System.err.println("AWT print.setup: canvasSize "+getWidth()+"x"+getWidth()+", scaleMat "+scaleMatX+" x "+scaleMatY+", useAA "+printUseAA+", printAnimator "+printAnimator);
+          {
+              final Set<Entry<Object, Object>> rEntries = rHints.entrySet();
+              int count = 0;
+              for(Iterator<Entry<Object, Object>> rEntryIter = rEntries.iterator(); rEntryIter.hasNext(); count++) {
+                  final Entry<Object, Object> rEntry = rEntryIter.next();
+                  System.err.println("Hint["+count+"]: "+rEntry.getKey()+" -> "+rEntry.getValue());
+              }
+          }
+          final AffineTransform aTrans = g2d.getTransform();
+          System.err.println(" scale "+aTrans.getScaleX()+" x "+aTrans.getScaleY());
+          System.err.println(" move "+aTrans.getTranslateX()+" x "+aTrans.getTranslateY());
+      }
+      final int componentCount = isOpaque() ? 3 : 4;
+      final TileRenderer printRenderer = new TileRenderer();
+      printAWTTiles = new AWTTilePainter(printRenderer, componentCount, scaleMatX, scaleMatY, DEBUG);
       AWTEDTExecutor.singleton.invoke(getTreeLock(), true /* allowOnNonEDT */, true /* wait */, setupPrintOnEDT);
   }
   private final Runnable setupPrintOnEDT = new Runnable() {
@@ -531,14 +557,34 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
           printAnimator =  helper.getAnimator();
           if( null != printAnimator ) {
               printAnimator.remove(GLJPanel.this);
-          }          
-          final int componentCount = isOpaque() ? 3 : 4;
-          final TileRenderer printRenderer = new TileRenderer();
-          printRenderer.setTileSize(getWidth(), getHeight(), 0);
-          printRenderer.attachToAutoDrawable(GLJPanel.this);
-          printAWTTiles = new AWTTilePainter(printRenderer, componentCount, DEBUG);
+          }
+          
+          printGLAD = GLJPanel.this; // default: re-use 
+          final GLCapabilities caps = (GLCapabilities)getChosenGLCapabilities().cloneMutable();
+          final GLProfile glp = caps.getGLProfile();
+          if( printUseAA && !caps.getSampleBuffers() ) {
+              if ( !glp.isGL2ES3() ) {
+                  if( DEBUG ) {
+                      System.err.println("Ignore MSAA due to gl-profile < GL2ES3");
+                  }
+                  printUseAA = false;
+              } else {
+                  // MSAA FBO ..
+                  caps.setDoubleBuffered(false);
+                  caps.setOnscreen(false);
+                  caps.setSampleBuffers(true);
+                  caps.setNumSamples(8);
+                  final GLDrawableFactory factory = GLDrawableFactory.getFactory(caps.getGLProfile());
+                  printGLAD = factory.createOffscreenAutoDrawable(null, caps, null, PRINT_TILE_SIZE, PRINT_TILE_SIZE, null);
+                  GLDrawableUtil.swapGLContextAndAllGLEventListener(GLJPanel.this, printGLAD);
+              }
+          }
+          printAWTTiles.renderer.setTileSize(printGLAD.getWidth(), printGLAD.getHeight(), 0);
+          printAWTTiles.renderer.attachToAutoDrawable(printGLAD);
           if( DEBUG ) {
               System.err.println("AWT print.setup "+printAWTTiles);
+              System.err.println("AWT print.setup AA "+printUseAA+", "+caps);
+              System.err.println("AWT print.setup "+printGLAD);
           }
       }
   };
@@ -563,6 +609,11 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
           }
           printAWTTiles.dispose();
           printAWTTiles= null;
+          if( printGLAD != GLJPanel.this ) {
+              GLDrawableUtil.swapGLContextAndAllGLEventListener(printGLAD, GLJPanel.this);
+              printGLAD.destroy();
+          }
+          printGLAD = null;
           if( null != printAnimator ) {
               printAnimator.add(GLJPanel.this);
               printAnimator = null;
@@ -582,33 +633,26 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
       }
       sendReshape = false; // clear reshape flag
       handleReshape = false; // ditto
-      final Graphics2D printGraphics = (Graphics2D)graphics;
-      if( DEBUG ) {
-          System.err.println("AWT print.0: canvasSize "+getWidth()+"x"+getWidth()+", printAnimator "+printAnimator);
-          {
-              final RenderingHints rHints = printGraphics.getRenderingHints();
-              final Set<Entry<Object, Object>> rEntries = rHints.entrySet();
-              int count = 0;
-              for(Iterator<Entry<Object, Object>> rEntryIter = rEntries.iterator(); rEntryIter.hasNext(); count++) {
-                  final Entry<Object, Object> rEntry = rEntryIter.next();
-                  System.err.println("Hint["+count+"]: "+rEntry.getKey()+" -> "+rEntry.getValue());
-              }
+      
+      final Graphics2D g2d = (Graphics2D)graphics;
+      printAWTTiles.setupGraphics2DAndClipBounds(g2d);
+      try {
+          final TileRenderer tileRenderer = printAWTTiles.renderer; 
+          if( DEBUG ) {
+              System.err.println("AWT print.0: "+tileRenderer);
           }
-          final AffineTransform aTrans = printGraphics.getTransform();
-          System.err.println(" scale "+aTrans.getScaleX()+" x "+aTrans.getScaleY());
-          System.err.println(" move "+aTrans.getTranslateX()+" x "+aTrans.getTranslateY());
-      }      
-      printAWTTiles.updateGraphics2DAndClipBounds(printGraphics);
-      final TileRenderer tileRenderer = printAWTTiles.getTileRenderer(); 
-      if( DEBUG ) {
-          System.err.println("AWT print.0: "+tileRenderer);
+          do {
+              if( printGLAD != GLJPanel.this ) {
+                  tileRenderer.display();
+              } else {
+                  backend.doPlainPaint();
+              }
+          } while ( !tileRenderer.eot() );
+      } finally {
+          printAWTTiles.resetGraphics2D();
       }
-      do {
-          // printRenderer.display();
-          backend.doPlainPaint();
-      } while ( !tileRenderer.eot() );
       if( DEBUG ) {
-          System.err.println("AWT print.X: "+tileRenderer);
+          System.err.println("AWT print.X: "+printAWTTiles);
       }
   }
   @Override
@@ -803,6 +847,12 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
     // so swapping the buffers doesn't do anything. We also don't
     // currently have the provision to skip copying the data to the
     // Swing portion of the GLJPanel in any of the rendering paths.
+    if( printActive && isInitialized) {
+        final Backend b = backend;
+        if ( null != b ) {
+            b.getDrawable().swapBuffers();
+        }
+    }
   }
 
   @Override
@@ -1007,7 +1057,7 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
       backend.postGL(g, true);
     }
 
-    public void print(GLAutoDrawable drawable) {
+    public void plainPaint(GLAutoDrawable drawable) {
       helper.display(GLJPanel.this);
     }
     
@@ -1066,7 +1116,7 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
   private final Runnable updaterPlainDisplayAction = new Runnable() {
     @Override
     public void run() {
-      updater.print(GLJPanel.this);
+      updater.plainPaint(GLJPanel.this);
     }
   };
   
@@ -1405,13 +1455,14 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
             gl2es3.glPixelStorei(GL2ES3.GL_PACK_ROW_LENGTH, pixelBuffer.width);
             gl2es3.glReadBuffer(gl2es3.getDefaultReadBuffer());
         }
-
+        
+        offscreenDrawable.swapBuffers();
+        
         if(null != glslTextureRaster) { // implies flippedVertical
             // perform vert-flipping via OpenGL/FBO        
             final GLFBODrawable fboDrawable = (GLFBODrawable)offscreenDrawable;
             final FBObject.TextureAttachment fboTex = fboDrawable.getTextureBuffer(GL.GL_FRONT);
             
-            fboDrawable.swapBuffers();
             fboFlipped.bind(gl);
             
             // gl.glActiveTexture(GL.GL_TEXTURE0 + fboDrawable.getTextureUnit()); // implicit by GLFBODrawableImpl: swapBuffers/contextMadeCurent -> swapFBOImpl
diff --git a/src/jogl/classes/jogamp/opengl/awt/AWTTilePainter.java b/src/jogl/classes/jogamp/opengl/awt/AWTTilePainter.java
index 7493a19c5..8d07bdb8e 100644
--- a/src/jogl/classes/jogamp/opengl/awt/AWTTilePainter.java
+++ b/src/jogl/classes/jogamp/opengl/awt/AWTTilePainter.java
@@ -31,6 +31,7 @@ import java.awt.Color;
 import java.awt.Graphics2D;
 import java.awt.Rectangle;
 import java.awt.Shape;
+import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
 import java.awt.image.DataBufferInt;
 
@@ -51,13 +52,15 @@ import com.jogamp.opengl.util.awt.AWTGLPixelBuffer.AWTGLPixelBufferProvider;
  * </p>
  */
 public class AWTTilePainter {
-    final private TileRenderer renderer;
-    final private int componentCount;
-    final private boolean verbose;
+    public final TileRenderer renderer;
+    public final int componentCount;
+    public final double scaleMatX, scaleMatY;
+    public final boolean verbose;
     
     private AWTGLPixelBuffer tBuffer = null;
     private BufferedImage vFlipImage = null;
     private Graphics2D g2d = null;
+    private AffineTransform saveAT = null;    
     
     /** 
      * Assumes a configured {@link TileRenderer}, i.e.
@@ -69,30 +72,43 @@ public class AWTTilePainter {
      * <p>
      * <code>componentCount</code> reflects opaque, i.e. 4 if non opaque.
      * </p>
+     * @param renderer
+     * @param componentCount
+     * @param scaleMatX {@link Graphics2D} {@link Graphics2D#scale(double, double) scaling factor}, i.e. rendering 1/scaleMatX * width pixels
+     * @param scaleMatY {@link Graphics2D} {@link Graphics2D#scale(double, double) scaling factor}, i.e. rendering 1/scaleMatY * height pixels
+     * @param verbose
      */
-    public AWTTilePainter(TileRenderer renderer, int componentCount, boolean verbose) {
+    public AWTTilePainter(TileRenderer renderer, int componentCount, double scaleMatX, double scaleMatY, boolean verbose) {
         this.renderer = renderer;
         this.renderer.setGLEventListener(preTileGLEL, postTileGLEL);
         this.componentCount = componentCount;
+        this.scaleMatX = scaleMatX;
+        this.scaleMatY = scaleMatY;
         this.verbose = verbose;
         this.renderer.setRowOrder(TileRenderer.TR_TOP_TO_BOTTOM);
     }
     
     public String toString() { return renderer.toString(); }
     
-    public TileRenderer getTileRenderer() { return renderer; }
-    
     /**
      * Caches the {@link Graphics2D} instance for rendering.
      * <p>
+     * Copies the current {@link Graphics2D} {@link AffineTransform}
+     * and scales {@link Graphics2D} w/ <code>scaleMatX</code> x <code>scaleMatY</code>.<br>
+     * After rendering, the {@link AffineTransform} should be reset via {@link #resetGraphics2D()}.
+     * </p>
+     * <p>
      * Sets the {@link TileRenderer}'s {@link TileRenderer#setImageSize(int, int) image size}
      * and {@link TileRenderer#setTileOffset(int, int) tile offset} according the
      * the {@link Graphics2D#getClipBounds() graphics clip bounds}.
      * </p>
      * @param g2d
      */
-    public void updateGraphics2DAndClipBounds(Graphics2D g2d) {
+    public void setupGraphics2DAndClipBounds(Graphics2D g2d) {
         this.g2d = g2d;
+        saveAT = g2d.getTransform();
+        g2d.scale(scaleMatX, scaleMatY);
+        
         final Rectangle gClipOrig = g2d.getClipBounds();
         final Rectangle gClip = new Rectangle(gClipOrig);
         if( 0 > gClip.x ) {
@@ -106,10 +122,15 @@ public class AWTTilePainter {
         if( verbose ) {
             System.err.println("AWT print.0: "+gClipOrig+" -> "+gClip);
         }
-        renderer.setImageSize(gClip.width, gClip.height);      
+        renderer.setImageSize(gClip.width, gClip.height);
         renderer.setTileOffset(gClip.x, gClip.y);
     }
     
+    /** See {@ #setupGraphics2DAndClipBounds(Graphics2D)}. */
+    public void resetGraphics2D() {        
+        g2d.setTransform(saveAT);
+    }
+    
     /**
      * Disposes resources and {@link TileRenderer#detachFromAutoDrawable() detaches}
      * the {@link TileRenderer}'s {@link GLAutoDrawable}.
@@ -194,24 +215,20 @@ public class AWTTilePainter {
             }
             final Shape oClip = g2d.getClip();
             g2d.clipRect(pX, pYf, tWidth, tHeight);
-            final Shape clip = g2d.getClip();
             g2d.drawImage(dstImage, pX, pYf, dstImage.getWidth(), dstImage.getHeight(), null); // Null ImageObserver since image data is ready.
-            g2d.setColor(Color.BLACK);
-            g2d.drawRect(pX, pYf, tWidth, tHeight);
-            {
+            if( verbose ) {
+                System.err.println("XXX tile-post.X clip "+oClip+" -> "+g2d.getClip());
+                g2d.setColor(Color.BLACK);
+                g2d.drawRect(pX, pYf, tWidth, tHeight);
                 final Rectangle r = oClip.getBounds();
                 g2d.setColor(Color.YELLOW);
                 g2d.drawRect(r.x, r.y, r.width, r.height);
-            }
-            g2d.setClip(oClip);
-            if( verbose ) {
-                System.err.println("XXX tile-post.X clip "+oClip+" -> "+clip);
                 System.err.println("XXX tile-post.X "+renderer);
                 System.err.println("XXX tile-post.X dst-img "+dstImage.getWidth()+"x"+dstImage.getHeight()+" -> "+pX+"/"+pYf);
             }
+            g2d.setClip(oClip);
         }
         @Override
         public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {}
-    };      
-
+    };
 }