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1 files changed, 257 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/ReplicateScaleFilter.java b/libjava/classpath/java/awt/image/ReplicateScaleFilter.java
new file mode 100644
index 000000000..94aad85dd
--- /dev/null
+++ b/libjava/classpath/java/awt/image/ReplicateScaleFilter.java
@@ -0,0 +1,257 @@
+/* ReplicateScaleFilter.java -- Java class for filtering images
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt.image;
+
+import java.util.Hashtable;
+
+/**
+ * This filter should be used for fast scaling of images where the result
+ * does not need to ensure straight lines are still straight, etc.  The
+ * exact method is not defined by Sun but some sort of fast Box filter should
+ * probably be correct.
+ * <br>
+ * Currently this filter does nothing and needs to be implemented.
+ *
+ * @author C. Brian Jones (cbj@gnu.org)
+ */
+public class ReplicateScaleFilter extends ImageFilter
+{
+    public ReplicateScaleFilter(int width, int height) {
+        destHeight = height;
+        destWidth = width;
+    }
+
+    /**
+     * The height of the destination image.
+     */
+    protected int destHeight;
+
+    /**
+     * The width of the destination image.
+     */
+    protected int destWidth;
+
+    /**
+     * The height of the source image.
+     */
+    protected int srcHeight;
+
+    /**
+     * The width of the source image.
+     */
+    protected int srcWidth;
+
+    /**
+     *
+     */
+    protected int srcrows[];
+
+    /**
+     *
+     */
+    protected int srccols[];
+
+    /**
+     *
+     */
+    protected Object outpixbuf;
+
+    /**
+     * An <code>ImageProducer</code> indicates the size of the image
+     * being produced using this method.  A filter can override this
+     * method to intercept these calls from the producer in order to
+     * change either the width or the height before in turn calling
+     * the consumer's <code>setDimensions</code> method.
+     *
+     * @param width the width of the image
+     * @param height the height of the image
+     */
+    public void setDimensions(int width, int height)
+    {
+        srcWidth = width;
+        srcHeight = height;
+
+        /* If either destHeight or destWidth is < 0, the image should
+           maintain its original aspect ratio.  When both are < 0,
+           just maintain the original width and height. */
+        if (destWidth < 0 && destHeight < 0)
+        {
+            destWidth = width;
+            destHeight = height;
+        }
+        else if (destWidth < 0)
+        {
+            destWidth = width * destHeight / srcHeight;
+        }
+        else if (destHeight < 0)
+        {
+            destHeight = height * destWidth / srcWidth;
+        }
+
+        if (consumer != null)
+          consumer.setDimensions(destWidth, destHeight);
+    }
+
+    /**
+     * An <code>ImageProducer</code> can set a list of properties
+     * associated with this image by using this method.
+     *
+     * @param props the list of properties associated with this image
+     */
+    public void setProperties(Hashtable<?, ?> props)
+    {
+      Hashtable<Object, Object> prop2 = (Hashtable<Object, Object>) props;
+      prop2.put("filters", "ReplicateScaleFilter");
+      if (consumer != null)
+        consumer.setProperties(prop2);
+    }
+
+    /**
+     * This function delivers a rectangle of pixels where any
+     * pixel(m,n) is stored in the array as a <code>byte</code> at
+     * index (n * scansize + m + offset).
+     *
+     * @param x the x coordinate of the rectangle
+     * @param y the y coordinate of the rectangle
+     * @param w the width of the rectangle
+     * @param h the height of the rectangle
+     * @param model the <code>ColorModel</code> used to translate the pixels
+     * @param pixels the array of pixel values
+     * @param offset the index of the first pixels in the <code>pixels</code> array
+     * @param scansize the width to use in extracting pixels from the <code>pixels</code> array
+     */
+    public void setPixels(int x, int y, int w, int h,
+           ColorModel model, byte[] pixels, int offset, int scansize)
+    {
+      if (srcrows == null || srccols == null)
+        setupSources();
+      int dx1 = (2 * x * destWidth + srcWidth - 1) / (2 * destWidth);
+      int dy1 = (2 * y * destHeight + srcHeight - 1) / (2 * destHeight);
+      byte[] pix;
+      if (outpixbuf != null && outpixbuf instanceof byte[])
+        {
+          pix = (byte[]) outpixbuf;
+        }
+      else
+        {
+          pix = new byte[destWidth];
+          outpixbuf = pix;
+        }
+      int sy, sx;
+      for (int yy = dy1; (sy = srcrows[yy]) < y + h; yy++)
+        {
+          int offs = offset + scansize * (sy - y);
+          int xx;
+          for (xx = dx1; (sx = srccols[xx]) < x + w; xx++)
+            {
+              pix[xx] = pixels[offs + sx - x];
+            }
+          if (xx > dx1)
+            {
+              consumer.setPixels(dx1, yy, xx - dx1, 1, model, pix, dx1,
+                                 destWidth);
+            }
+        }
+    }
+
+    /**
+     * This function delivers a rectangle of pixels where any
+     * pixel(m,n) is stored in the array as an <code>int</code> at
+     * index (n * scansize + m + offset).
+     *
+     * @param x the x coordinate of the rectangle
+     * @param y the y coordinate of the rectangle
+     * @param w the width of the rectangle
+     * @param h the height of the rectangle
+     * @param model the <code>ColorModel</code> used to translate the pixels
+     * @param pixels the array of pixel values
+     * @param offset the index of the first pixels in the <code>pixels</code> array
+     * @param scansize the width to use in extracting pixels from the <code>pixels</code> array
+     */
+    public void setPixels(int x, int y, int w, int h,
+           ColorModel model, int[] pixels, int offset, int scansize)
+    {
+      if (srcrows == null || srccols == null)
+        setupSources();
+      int dx1 = (2 * x * destWidth + srcWidth - 1) / (2 * destWidth);
+      int dy1 = (2 * y * destHeight + srcHeight - 1) / (2 * destHeight);
+      int[] pix;
+      if (outpixbuf != null && outpixbuf instanceof int[])
+        {
+          pix = (int[]) outpixbuf;
+        }
+      else
+        {
+          pix = new int[destWidth];
+          outpixbuf = pix;
+        }
+      int sy, sx;
+      for (int yy = dy1; (sy = srcrows[yy]) < y + h; yy++)
+        {
+          int offs = offset + scansize * (sy - y);
+          int xx;
+          for (xx = dx1; (sx = srccols[xx]) < x + w; xx++)
+            {
+              pix[xx] = pixels[offs + sx - x];
+            }
+          if (xx > dx1)
+            {
+              consumer.setPixels(dx1, yy, xx - dx1, 1, model, pix, dx1,
+                                 destWidth);
+            }
+        }
+    }
+
+  /**
+   * Sets up the srcrows and srccols arrays.
+   */
+  private void setupSources()
+  {
+    srcrows = new int[destHeight + 1];
+    for (int y = 0; y <= destHeight; y++)
+      {
+        srcrows[y] = (2 * y * srcHeight + srcHeight) / (2 * destHeight);
+      }
+    srccols = new int[destWidth + 1];
+    for (int x = 0; x <= destWidth; x++)
+      {
+        srccols[x] = (2 * x * srcWidth + srcWidth) / (2 * destWidth);
+      }
+  }
+}