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1 files changed, 184 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/CropImageFilter.java b/libjava/classpath/java/awt/image/CropImageFilter.java
new file mode 100644
index 000000000..4d8fb624f
--- /dev/null
+++ b/libjava/classpath/java/awt/image/CropImageFilter.java
@@ -0,0 +1,184 @@
+/* CropImageFilter.java -- Java class for cropping image filter
+   Copyright (C) 1999, 2004  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.awt.Rectangle;
+import java.util.Hashtable;
+
+/**
+ * Currently this filter does almost nothing and needs to be implemented.
+ *
+ * @author C. Brian Jones (cbj@gnu.org)
+ */
+public class CropImageFilter extends ImageFilter
+{
+    int x;
+    int y;
+    int width;
+    int height;
+
+    /**
+     * Construct a new <code>CropImageFilter</code> instance.
+     *
+     * @param x the x-coordinate location of the top-left of the cropped rectangle
+     * @param y the y-coordinate location of the top-left of the cropped rectangle
+     * @param width the width of the cropped rectangle
+     * @param height the height of the cropped rectangle
+     */
+    public CropImageFilter(int x, int y, int width, int height) {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+    }
+
+    /**
+     * An <code>ImageProducer</code> indicates the size of the image
+     * being produced using this method.  This filter overrides this
+     * method in order to set the dimentions to the size of the
+     * cropped rectangle instead of the size of the image.
+     *
+     * @param width the width of the image
+     * @param height the height of the image
+     */
+    public void setDimensions(int width, int height)
+    {
+      if (consumer != null)
+        consumer.setDimensions(this.width, this.height);
+    }
+
+    /**
+     * An <code>ImageProducer</code> can set a list of properties
+     * associated with this image by using this method.
+     * <br>
+     * FIXME - What property is set for this class?
+     *
+     * @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", "CropImageFilter");
+      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)
+    {
+        Rectangle filterBounds = new Rectangle(this.x, this.y,
+                                               this.width, this.height);
+        Rectangle pixelBounds = new Rectangle(x, y, w, h);
+
+        if (filterBounds.intersects(pixelBounds))
+        {
+            Rectangle bounds = filterBounds.intersection(pixelBounds);
+
+            byte[] cropped = new byte[bounds.width * bounds.height];
+            for (int i = 0; i < bounds.height; i++)
+            {
+                int start = (bounds.y - pixelBounds.y + i) * scansize + offset;
+
+                for (int j = 0; j < bounds.width; j++)
+                    cropped[i * bounds.width + j] = pixels[start + bounds.x + j];
+            }
+
+            if (consumer != null)
+              consumer.setPixels(0, 0,
+                                 bounds.width, bounds.height,
+                                 model, cropped, 0, bounds.width);
+        }
+    }
+
+    /**
+     * 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)
+    {
+        Rectangle filterBounds = new Rectangle(this.x, this.y,
+                                               this.width, this.height);
+        Rectangle pixelBounds = new Rectangle(x, y, w, h);
+
+        if (filterBounds.intersects(pixelBounds))
+        {
+            Rectangle bounds = filterBounds.intersection(pixelBounds);
+
+            int[] cropped = new int[bounds.width * bounds.height];
+            for (int i = 0; i < bounds.height; i++)
+            {
+                int start = (bounds.y - pixelBounds.y + i) * scansize + offset;
+
+                for (int j = 0; j < bounds.width; j++)
+                    cropped[i * bounds.width + j] = pixels[start + bounds.x + j];
+            }
+
+            if (consumer != null)
+              consumer.setPixels(0, 0,
+                                 bounds.width, bounds.height,
+                                 model, cropped, 0, bounds.width);
+        }
+    }
+
+}