| /* RGBImageFilter.java -- Java class for filtering Pixels by RGB values |
| Copyright (C) 1999, 2005 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; |
| |
| /** |
| * A filter designed to filter images in the default RGBColorModel regardless of |
| * the ImageProducer's ColorModel. |
| * |
| * @author Mark Benvenuto (mcb54@columbia.edu) |
| */ |
| public abstract class RGBImageFilter extends ImageFilter |
| { |
| protected ColorModel origmodel; |
| |
| protected ColorModel newmodel; |
| |
| /** |
| Specifies whether to apply the filter to the index entries of the |
| IndexColorModel. Subclasses should set this to true if the filter |
| does not depend on the pixel's coordinate. |
| */ |
| protected boolean canFilterIndexColorModel = false; |
| |
| /** |
| Construct new RGBImageFilter. |
| */ |
| public RGBImageFilter() |
| { |
| } |
| |
| /** |
| * Sets the ColorModel used to filter with. If the specified ColorModel is IndexColorModel |
| * and canFilterIndexColorModel is true, we subsitute the ColorModel for a filtered one |
| * here and in setPixels whenever the original one appears. Otherwise overrides the default |
| * ColorModel of ImageProducer and specifies the default RGBColorModel |
| * |
| * @param model the color model to be used most often by setPixels |
| * @see ColorModel */ |
| public void setColorModel(ColorModel model) |
| { |
| origmodel = model; |
| newmodel = model; |
| |
| if( ( model instanceof IndexColorModel) && canFilterIndexColorModel ) { |
| newmodel = filterIndexColorModel( (IndexColorModel) model ); |
| if (consumer != null) |
| consumer.setColorModel(newmodel); |
| } |
| else { |
| if (consumer != null) |
| consumer.setColorModel(ColorModel.getRGBdefault()); |
| } |
| } |
| |
| /** |
| Registers a new ColorModel to subsitute for the old ColorModel when |
| setPixels encounters the a pixel with the old ColorModel. The pixel |
| remains unchanged except for a new ColorModel. |
| |
| @param oldcm the old ColorModel |
| @param newcm the new ColorModel |
| */ |
| public void substituteColorModel(ColorModel oldcm, |
| ColorModel newcm) |
| { |
| origmodel = oldcm; |
| newmodel = newcm; |
| } |
| |
| /** |
| Filters an IndexColorModel through the filterRGB function. Uses |
| coordinates of -1 to indicate its filtering an index and not a pixel. |
| |
| @param icm an IndexColorModel to filter |
| */ |
| public IndexColorModel filterIndexColorModel(IndexColorModel icm) |
| { |
| int len = icm.getMapSize(), rgb; |
| byte reds[] = new byte[len], greens[] = new byte[len], blues[] = new byte[len], alphas[] = new byte[len]; |
| |
| icm.getAlphas( alphas ); |
| icm.getReds( reds ); |
| icm.getGreens( greens ); |
| icm.getBlues( blues ); |
| |
| for( int i = 0; i < len; i++ ) |
| { |
| rgb = filterRGB( -1, -1, makeColor ( alphas[i], reds[i], greens[i], blues[i] ) ); |
| alphas[i] = (byte)(( 0xff000000 & rgb ) >> 24); |
| reds[i] = (byte)(( 0xff0000 & rgb ) >> 16); |
| greens[i] = (byte)(( 0xff00 & rgb ) >> 8); |
| blues[i] = (byte)(0xff & rgb); |
| } |
| return new IndexColorModel( icm.getPixelSize(), len, reds, greens, blues, alphas ); |
| } |
| |
| private int makeColor( byte a, byte r, byte g, byte b ) |
| { |
| return ( 0xff000000 & (a << 24) | 0xff0000 & (r << 16) | 0xff00 & (g << 8) | 0xff & b ); |
| } |
| |
| /** |
| This functions filters a set of RGB pixels through filterRGB. |
| |
| @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 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 filterRGBPixels(int x, int y, int w, int h, int[] pixels, |
| int offset, int scansize) |
| { |
| for (int yp = 0; yp < h; yp++) |
| { |
| for (int xp = 0; xp < w; xp++) |
| { |
| pixels[offset + xp] = filterRGB(xp + x, yp + y, pixels[offset + xp]); |
| } |
| offset += scansize; |
| } |
| } |
| |
| |
| /** |
| * If the ColorModel is the same ColorModel which as already converted |
| * then it converts it the converted ColorModel. Otherwise it passes the |
| * array of pixels through filterRGBpixels. |
| * |
| * @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(model == origmodel && (model instanceof IndexColorModel) && canFilterIndexColorModel) |
| { |
| if (consumer != null) |
| consumer.setPixels(x, y, w, h, newmodel, pixels, offset, scansize); |
| } |
| else |
| { |
| int intPixels[] = |
| convertColorModelToDefault( x, y, w, h, model, pixels, offset, scansize ); |
| filterRGBPixels( x, y, w, h, intPixels, offset, scansize ); |
| if (consumer != null) |
| consumer.setPixels(x, y, w, h, ColorModel.getRGBdefault(), intPixels, offset, scansize); |
| } |
| } |
| |
| /** |
| * 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(model == origmodel && (model instanceof IndexColorModel) && canFilterIndexColorModel) |
| { |
| if (consumer != null) |
| consumer.setPixels(x, y, w, h, newmodel, pixels, offset, scansize); |
| } |
| else |
| { |
| //FIXME: Store the filtered pixels in a separate temporary buffer? |
| convertColorModelToDefault( x, y, w, h, model, pixels, offset, scansize ); |
| filterRGBPixels( x, y, w, h, pixels, offset, scansize ); |
| if (consumer != null) |
| consumer.setPixels(x, y, w, h, ColorModel.getRGBdefault(), pixels, offset, scansize); |
| } |
| } |
| |
| private int[] convertColorModelToDefault(int x, int y, int w, int h, |
| ColorModel model, byte pixels[], |
| int offset, int scansize) |
| { |
| int intPixels[] = new int[pixels.length]; |
| for (int i = 0; i < pixels.length; i++) |
| intPixels[i] = makeColorbyDefaultCM(model, pixels[i]); |
| return intPixels; |
| } |
| |
| private void convertColorModelToDefault(int x, int y, int w, int h, |
| ColorModel model, int pixels[], |
| int offset, int scansize) |
| { |
| for (int i = 0; i < pixels.length; i++) |
| pixels[i] = makeColorbyDefaultCM(model, pixels[i]); |
| } |
| |
| private int makeColorbyDefaultCM(ColorModel model, byte rgb) |
| { |
| return makeColor( model.getAlpha( rgb ) * 4, model.getRed( rgb ) * 4, model.getGreen( rgb ) * 4, model.getBlue( rgb ) * 4 ); |
| } |
| |
| private int makeColorbyDefaultCM(ColorModel model, int rgb) |
| { |
| return makeColor( model.getAlpha( rgb ), model.getRed( rgb ), model.getGreen( rgb ), model.getBlue( rgb ) ); |
| } |
| |
| private int makeColor( int a, int r, int g, int b ) |
| { |
| return (int)( 0xff000000 & (a << 24) | 0xff0000 & (r << 16) | 0xff00 & (g << 8) | 0xff & b ); |
| } |
| |
| |
| /** |
| Filters a single pixel from the default ColorModel. |
| |
| @param x x-coordinate |
| @param y y-coordinate |
| @param rgb color |
| */ |
| public abstract int filterRGB(int x, |
| int y, |
| int rgb); |
| } |