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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java')
-rw-r--r-- | libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java b/libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java new file mode 100644 index 000000000..db2335f1c --- /dev/null +++ b/libjava/classpath/java/awt/image/AreaAveragingScaleFilter.java @@ -0,0 +1,268 @@ +/* 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; + } +} |