undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/jdk/java/awt/image/DrawImage/ScaledImageAlphaTest.java
+++ b/test/jdk/java/awt/image/DrawImage/ScaledImageAlphaTest.java
@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2016, 2016, 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.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @key headful
+ * @bug     8139183
+ * @summary Test verifies whether alpha channel of a translucent
+ *          image is proper or not after scaling through drawImage.
+ * @run     main ScaledImageAlphaTest
+ */
+
+import java.awt.AlphaComposite;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsEnvironment;
+import java.awt.Transparency;
+import java.awt.image.BufferedImage;
+import java.awt.image.VolatileImage;
+
+public class ScaledImageAlphaTest {
+
+    static final int translucentAlpha = 128, opaqueAlpha = 255;
+    static final int[] translucentVariants = new int[] {
+        BufferedImage.TYPE_INT_ARGB,
+        BufferedImage.TYPE_INT_ARGB_PRE,
+        BufferedImage.TYPE_4BYTE_ABGR,
+        BufferedImage.TYPE_4BYTE_ABGR_PRE
+    };
+    static final int[] alphaValues = new int[] {
+        translucentAlpha,
+        opaqueAlpha
+    };
+    static int width = 50, height = 50;
+    static int scaleX = 5, scaleY = 5, scaleWidth = 40, scaleHeight = 40;
+
+    private static void verifyAlpha(Color color, int alpha) {
+
+        /* if extracted alpha value is equal alpha that we set
+         * for background color, alpha channel is not lost
+         * while scaling otherwise we have lost alpha channel.
+         */
+        int extractedAlpha = color.getAlpha();
+
+        if (extractedAlpha != alpha) {
+            throw new RuntimeException("Alpha channel for background"
+                    + " is lost while scaling");
+        }
+    }
+
+    private static void validateBufferedImageAlpha() {
+
+        Color backgroundColor, extractedColor;
+        // verify for all translucent buffered image types
+        for (int type : translucentVariants) {
+            // verify for both opaque and translucent background color
+            for (int alpha : alphaValues) {
+                // create BufferedImage of dimension (50,50)
+                BufferedImage img = new
+                    BufferedImage(width, height, type);
+                Graphics2D imgGraphics = (Graphics2D)img.getGraphics();
+                /* scale image to smaller dimension and set any
+                 * background color with alpha.
+                 */
+                backgroundColor = new Color(0, 255, 0, alpha);
+                imgGraphics.
+                    drawImage(img, scaleX, scaleY, scaleWidth, scaleHeight,
+                              backgroundColor, null);
+                imgGraphics.dispose();
+
+                /* get pixel information for background color with
+                 * scaled coordinates.
+                 */
+                extractedColor = new Color(img.getRGB(scaleX, scaleY), true);
+                verifyAlpha(extractedColor, alpha);
+            }
+        }
+    }
+
+    private static void validateVolatileImageAlpha() {
+
+        Color backgroundColor, extractedColor;
+        VolatileImage img;
+        BufferedImage bufImg = new
+                    BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
+        for (int alpha : alphaValues) {
+            backgroundColor = new Color(0, 255, 0, alpha);
+            do {
+                img = createVolatileImage(width, height,
+                                          Transparency.TRANSLUCENT);
+                Graphics2D imgGraphics = (Graphics2D)img.getGraphics();
+                // clear VolatileImage as by default it has white opaque image
+                imgGraphics.setComposite(AlphaComposite.Clear);
+                imgGraphics.fillRect(0,0, width, height);
+
+                imgGraphics.setComposite(AlphaComposite.SrcOver);
+                /* scale image to smaller dimension and set background color
+                 * to green with translucent alpha.
+                 */
+                imgGraphics.
+                    drawImage(img, scaleX, scaleY, scaleWidth, scaleHeight,
+                              backgroundColor, null);
+                //get BufferedImage out of VolatileImage
+                bufImg = img.getSnapshot();
+                imgGraphics.dispose();
+            } while (img.contentsLost());
+
+            /* get pixel information for background color with
+             * scaled coordinates.
+             */
+            extractedColor = new Color(bufImg.getRGB(scaleX, scaleY), true);
+            verifyAlpha(extractedColor, alpha);
+        }
+    }
+
+    private static VolatileImage createVolatileImage(int width, int height,
+                                                     int transparency) {
+        GraphicsEnvironment ge = GraphicsEnvironment.
+                                 getLocalGraphicsEnvironment();
+        GraphicsConfiguration gc = ge.getDefaultScreenDevice().
+                                   getDefaultConfiguration();
+
+        VolatileImage image = gc.createCompatibleVolatileImage(width, height,
+                                                               transparency);
+        return image;
+    }
+
+    public static void main(String[] args) {
+        // test alpha channel with different types of BufferedImage
+        validateBufferedImageAlpha();
+        // test alpha channel with VolatileImage
+        validateVolatileImageAlpha();
+    }
+}