FYI: Graphics.clearRect test

[Francis Kung <fkung at redhat dot com>]

Hi,

This patch, already committed, adds a test for the Graphics.clearRect()
method.

Regards,
Francis


2006-10-02  Francis Kung  <fkung@redhat.com>

	* gnu/testlet/java/awt/Graphics/clearRect.java: New file.

Index: gnu/testlet/java/awt/Graphics/clearRect.java
===================================================================
RCS file: gnu/testlet/java/awt/Graphics/clearRect.java
diff -N gnu/testlet/java/awt/Graphics/clearRect.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gnu/testlet/java/awt/Graphics/clearRect.java	1 Jan 1970 00:00:00 -0000
@@ -0,0 +1,87 @@
+/* clearRect.java -- checks for the clearRect() method in the Graphics class.
+   Copyright (C) 2006 Francis Kung <fkung@redhat.com>
+This file is part of Mauve.
+
+Mauve is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+Mauve is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Mauve; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+*/
+
+// Tags: JDK1.2
+
+package gnu.testlet.java.awt.Graphics;
+
+import gnu.testlet.TestHarness;
+import gnu.testlet.Testlet;
+
+import java.awt.AlphaComposite;
+import java.awt.Color;
+import java.awt.GradientPaint;
+import java.awt.Graphics2D;
+import java.awt.geom.Point2D;
+import java.awt.image.BufferedImage;
+
+public class clearRect implements Testlet
+{
+  
+  public void test(TestHarness harness)
+  {
+    BufferedImage img = new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB);
+    Graphics2D g2d = (Graphics2D)img.getGraphics();
+
+    // The default, at least for BufferedImageGraphics
+    harness.check(g2d.getBackground(), new Color(0,0,0,255));
+    harness.check(img.getRaster().getSample(10, 10, 0), 0);
+    harness.check(img.getRaster().getSample(10, 10, 1), 0);
+    harness.check(img.getRaster().getSample(10, 10, 2), 0);
+    harness.check(img.getRaster().getSample(10, 10, 3), 0);
+    
+    // Show that clearRect only depends on background, and ignores current
+    // color, composite, and paint
+    g2d.setColor(new Color(200, 200, 200, 50));
+    g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));
+    g2d.setPaint(new GradientPaint(new Point2D.Double(0,0),
+                                   new Color(10, 10, 10),
+                                   new Point2D.Double(20, 20),
+                                   new Color(75, 75, 75),
+                                   true));
+    
+    Color c = new Color(100, 100, 100);
+    g2d.setBackground(c);
+    g2d.clearRect(0, 0, 20, 20);
+    harness.check(img.isAlphaPremultiplied(), false);
+    
+    harness.check(g2d.getBackground(), c);
+    harness.check(img.getRaster().getSample(10, 10, 0), 100);
+    harness.check(img.getRaster().getSample(10, 10, 1), 100);
+    harness.check(img.getRaster().getSample(10, 10, 2), 100);
+    harness.check(img.getRaster().getSample(10, 10, 3), 255);
+    
+    // Show that the background is applied with a AlphaComposite.SRC rule,
+    // that is, the entire contents are directly replaced by the background
+    // and no compositing is performed.
+    c = new Color(200, 200, 200, 51);
+    g2d.setBackground(c);
+    g2d.clearRect(0, 0, 20, 20);
+    harness.check(img.isAlphaPremultiplied(), false);
+
+    harness.check(g2d.getBackground(), c);
+    harness.check(img.getRaster().getSample(10, 10, 0), 200);
+    harness.check(img.getRaster().getSample(10, 10, 1), 200);
+    harness.check(img.getRaster().getSample(10, 10, 2), 200);
+    harness.check(img.getRaster().getSample(10, 10, 3), 51);
+  }
+}
+