1 /* ColorPaintContext.java -- context for painting solid colors
2 Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
41 import java.awt.image.ColorModel;
42 import java.awt.image.Raster;
45 * This class provides a paint context which will fill a rectanglar region of
46 * a raster scan with the given color. However, it is not yet completely
49 * @author Eric Blake (ebb9@email.byu.edu)
51 class ColorPaintContext implements PaintContext
54 * The color to fill any raster with. Package visible for use in
58 final ColorModel colorModel;
60 private ColorRaster cachedRaster;
64 * Create the context for a given color.
66 * @param colorRGB The solid color to use.
68 ColorPaintContext(int colorRGB)
70 this(ColorModel.getRGBdefault(), colorRGB);
74 * Create the context for a given color.
76 * @param cm The color model of this context.
77 * @param colorRGB The solid color to use.
79 ColorPaintContext(ColorModel cm,int colorRGB)
86 * Release the resources allocated for the paint. As the color is constant,
87 * there aren't any resources.
94 * Return the color model of this context.
96 * @return the context color model
98 public ColorModel getColorModel()
104 * Return a raster containing the colors for the graphics operation.
106 * @param x the x-coordinate, in device space
107 * @param y the y-coordinate, in device space
108 * @param width the width, in device space
109 * @param height the height, in device space
110 * @return a raster for the given area and color
112 public Raster getRaster(int x, int y, int width, int height)
114 if( cachedRaster == null
115 || cachedRaster.getWidth() < width
116 || cachedRaster.getHeight() < height)
118 cachedRaster = new ColorRaster(colorModel, 0, 0, width, height, color);
120 return cachedRaster.createChild(0 ,0 ,width ,height ,0 ,0 , null);
124 * A ColorRaster is a raster that is completely filled with one color. The
125 * data layout is taken from the color model given to the constructor.
127 private class ColorRaster extends Raster
131 * Create a raster that is compaltible with the given color model and
132 * filled with the given color.
133 * @param cm The color model for this raster.
134 * @param x The smallest horizontal corrdinate in the raster.
135 * @param y The smallest vertical coordinate in the raster.
136 * @param width The width of the raster.
137 * @param height The height of the raster.
138 * @param rgbPixel The RGB value of the color for this raster.
140 ColorRaster(ColorModel cm,int x, int y, int width, int height, int rgbPixel)
142 super(cm.createCompatibleSampleModel(width,height),new Point(x,y));
143 Object pixel = cm.getDataElements(rgbPixel,null);
144 int[] pixelComps = cm.getComponents(pixel, null, 0);
145 int[] d = (int[]) multiplyData(pixelComps,null,width*height);
146 getSampleModel().setPixels(0, 0, width, height, d,
152 private Object multiplyData(Object src, Object dest, int factor)
156 if (src instanceof byte[])
158 srcLength = ((byte[])src).length;
160 if (dest == null) dest = new byte[factor * srcLength];
162 else if (src instanceof short[])
164 srcLength = ((short[])src).length;
165 if (dest == null) dest = new short[factor * srcLength];
167 else if (src instanceof int[])
169 srcLength = ((int[]) src).length;
170 if (dest == null) dest = new int[factor * srcLength];
174 throw new ClassCastException("Unknown data buffer type");
177 System.arraycopy(src,0,dest,0,srcLength);
180 while(count*2 < factor)
182 System.arraycopy(dest, 0, dest, count * srcLength, count*srcLength);
187 System.arraycopy(dest,0, dest, count * srcLength,
188 (factor - count) * srcLength );
195 } // class ColorPaintContext