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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java
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+/* AreaAveragingScaleFilter.java -- Java class for filtering images
+ Copyright (C) 1999,2006 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;
+
+/**
+ * This filter should produce images which do not have image artifacts
+ * like broken lines which were originally unbroken. The cost is of
+ * course speed. Using bi-linear interpolation here against 4 pixel
+ * points should give the desired results although Sun does not
+ * specify what the exact algorithm should be.
+ * <br>
+ *
+ * @author C. Brian Jones (cbj@gnu.org)
+ */
+public class AreaAveragingScaleFilter extends ReplicateScaleFilter
+{
+ /**
+ * Construct an instance of <code>AreaAveragingScaleFilter</code> which
+ * should be used in conjunction with a <code>FilteredImageSource</code>
+ * object.
+ *
+ * @param width the width of the destination image
+ * @param height the height of the destination image
+ */
+ public AreaAveragingScaleFilter(int width, int height) {
+ super(width, height);
+ }
+
+ /**
+ * The <code>ImageProducer</code> should call this method with a
+ * bit mask of hints from any of <code>RANDOMPIXELORDER</code>,
+ * <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>,
+ * <code>SINGLEPASS</code>, <code>SINGLEFRAME</code> from the
+ * <code>ImageConsumer</code> interface.
+ * <br>
+ * FIXME - more than likely Sun's implementation desires
+ * <code>TOPDOWNLEFTRIGHT</code> order and this method is overloaded here
+ * in order to assure that mask is part of the hints added to
+ * the consumer.
+ *
+ * @param flags a bit mask of hints
+ * @see ImageConsumer
+ */
+ public void setHints(int flags)
+ {
+ if (consumer != null)
+ consumer.setHints(flags);
+ }
+
+ /**
+ * 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)
+ {
+ double rx = ((double) srcWidth) / destWidth;
+ double ry = ((double) srcHeight) / destHeight;
+
+ int destScansize = (int) Math.round(scansize / rx);
+
+ byte[] destPixels = averagePixels(x, y, w, h,
+ model, pixels, offset, scansize,
+ rx, ry, destScansize);
+
+ if (consumer != null)
+ consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry),
+ (int) Math.ceil(w/rx), (int) Math.ceil(h/ry),
+ model, destPixels, 0, destScansize);
+ }
+
+ /**
+ * 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)
+ {
+ double rx = ((double) srcWidth) / destWidth;
+ double ry = ((double) srcHeight) / destHeight;
+
+ int destScansize = (int) Math.round(scansize / rx);
+
+ int[] destPixels = averagePixels(x, y, w, h,
+ model, pixels, offset, scansize,
+ rx, ry, destScansize);
+
+ if (consumer != null)
+ consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry),
+ (int) Math.ceil(w/rx), (int) Math.ceil(h/ry),
+ model, destPixels, 0, destScansize);
+ }
+
+ /**
+ * This is a really terrible implementation,
+ * since it uses the nearest-neighbor method. This filter is rarely used though.
+ *
+ * @param srcx, srcy - Source rectangle upper-left corner
+ * @param srcw, srch - Source rectangle width and height
+ * @param model - Pixel color model
+ * @param srcPixels - Source pixel data.
+ * @param srcOffset - Starting offset into the source pixel data array.
+ * @param srcScansize - Source array scanline size.
+ * @param rx,ry - Scaling factor.
+ * @param destScansize - Destination array scanline size.
+ */
+ private byte[] averagePixels(int srcx, int srcy, int srcw, int srch,
+ ColorModel model, byte[] srcPixels,
+ int srcOffset, int srcScansize,
+ double rx, double ry, int destScansize)
+ {
+ int destW = (int) Math.ceil(srcw/rx);
+ int destH = (int) Math.ceil(srch/ry);
+ byte[] destPixels = new byte[ destW * destH ];
+ int sx, sy;
+
+ int w = (int)Math.ceil(rx);
+ int h = (int)Math.ceil(ry);
+
+ for(int x = 0; x < destW; x++)
+ for(int y = 0; y < destH; y++)
+ {
+ sx = (int) (x * rx);
+ sy = (int) (y * ry);
+
+ int r,g,b,a;
+ r = g = b = a = 0;
+
+ for(int i = 0; i < w; i++)
+ {
+ for(int j = 0; j < h; j++)
+ {
+ int idx = srcx + sx + i + (srcy + sy + j)*srcScansize;
+ r += model.getRed(srcPixels[ idx ]);
+ g += model.getGreen(srcPixels[ idx ]);
+ b += model.getBlue(srcPixels[ idx ]);
+ a += model.getAlpha(srcPixels[ idx ]);
+ }
+ }
+
+ r = r / (w * h);
+ g = g / (w * h);
+ b = b / (w * h);
+ a = a / (w * h);
+
+ // Does this really work?
+ destPixels[x + destScansize*y] = (byte)model.getDataElement
+ (new int[]{r, g, b, a}, 0);
+ }
+
+ return destPixels;
+ }
+
+ /**
+ * This is a really terrible implementation,
+ * since it uses the nearest-neighbor method. This filter is rarely used though.
+ *
+ * @param srcx, srcy - Source rectangle upper-left corner
+ * @param srcw, srch - Source rectangle width and height
+ * @param model - Pixel color model
+ * @param srcPixels - Source pixel data.
+ * @param srcOffset - Starting offset into the source pixel data array.
+ * @param srcScansize - Source array scanline size.
+ * @param rx,ry - Scaling factor.
+ * @param destScansize - Destination array scanline size.
+ */
+ private int[] averagePixels(int srcx, int srcy, int srcw, int srch,
+ ColorModel model, int[] srcPixels,
+ int srcOffset, int srcScansize,
+ double rx, double ry, int destScansize)
+ {
+ int destW = (int) Math.ceil(srcw/rx);
+ int destH = (int) Math.ceil(srch/ry);
+ int[] destPixels = new int[ destW * destH ];
+ int sx, sy;
+
+ int w = (int)Math.ceil(rx);
+ int h = (int)Math.ceil(ry);
+
+ for(int x = 0; x < destW; x++)
+ for(int y = 0; y < destH; y++)
+ {
+ sx = (int) (x * rx);
+ sy = (int) (y * ry);
+
+ int r,g,b,a;
+ r = g = b = a = 0;
+
+ for(int i = 0; i < w; i++)
+ {
+ for(int j = 0; j < h; j++)
+ {
+ int idx = srcx + sx + i + (srcy + sy + j)*srcScansize;
+ r += model.getRed(srcPixels[ idx ]);
+ g += model.getGreen(srcPixels[ idx ]);
+ b += model.getBlue(srcPixels[ idx ]);
+ a += model.getAlpha(srcPixels[ idx ]);
+ }
+ }
+
+ r = r / (w * h);
+ g = g / (w * h);
+ b = b / (w * h);
+ a = a / (w * h);
+
+ destPixels[x + destScansize*y] = model.getDataElement
+ (new int[]{r, g, b, a}, 0);
+ }
+
+ return destPixels;
+ }
+}