1 /* ColorPaintContext.java -- context for painting solid colors 2 Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 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) 9 any later version. 10 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. 15 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 19 02110-1301 USA. 20 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 24 combination. 25 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. */ 37 38 39 package java.awt; 40 41 import java.awt.image.ColorModel; 42 import java.awt.image.Raster; 43 44 /** 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 47 * implemented. 48 * 49 * @author Eric Blake (ebb9@email.byu.edu) 50 */ 51 class ColorPaintContext implements PaintContext 52 { 53 /** 54 * The color to fill any raster with. Package visible for use in 55 * SystemColor. 56 */ 57 final int color; 58 final ColorModel colorModel; 59 60 private ColorRaster cachedRaster; 61 62 63 /** 64 * Create the context for a given color. 65 * 66 * @param colorRGB The solid color to use. 67 */ ColorPaintContext(int colorRGB)68 ColorPaintContext(int colorRGB) 69 { 70 this(ColorModel.getRGBdefault(), colorRGB); 71 } 72 73 /** 74 * Create the context for a given color. 75 * 76 * @param cm The color model of this context. 77 * @param colorRGB The solid color to use. 78 */ ColorPaintContext(ColorModel cm,int colorRGB)79 ColorPaintContext(ColorModel cm,int colorRGB) 80 { 81 color = colorRGB; 82 colorModel = cm; 83 } 84 85 /** 86 * Release the resources allocated for the paint. As the color is constant, 87 * there aren't any resources. 88 */ dispose()89 public void dispose() 90 { 91 } 92 93 /** 94 * Return the color model of this context. 95 * 96 * @return the context color model 97 */ getColorModel()98 public ColorModel getColorModel() 99 { 100 return colorModel; 101 } 102 103 /** 104 * Return a raster containing the colors for the graphics operation. 105 * 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 111 */ getRaster(int x, int y, int width, int height)112 public Raster getRaster(int x, int y, int width, int height) 113 { 114 if( cachedRaster == null 115 || cachedRaster.getWidth() < width 116 || cachedRaster.getHeight() < height) 117 { 118 cachedRaster = new ColorRaster(colorModel, 0, 0, width, height, color); 119 } 120 return cachedRaster.createChild(0 ,0 ,width ,height ,0 ,0 , null); 121 } 122 123 /** 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. 126 */ 127 private class ColorRaster extends Raster 128 { 129 130 /** 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. 139 */ ColorRaster(ColorModel cm,int x, int y, int width, int height, int rgbPixel)140 ColorRaster(ColorModel cm,int x, int y, int width, int height, int rgbPixel) 141 { 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, 147 dataBuffer); 148 } 149 150 151 multiplyData(Object src, Object dest, int factor)152 private Object multiplyData(Object src, Object dest, int factor) 153 { 154 Object from; 155 int srcLength = 0; 156 if (src instanceof byte[]) 157 { 158 srcLength = ((byte[])src).length; 159 160 if (dest == null) dest = new byte[factor * srcLength]; 161 } 162 else if (src instanceof short[]) 163 { 164 srcLength = ((short[])src).length; 165 if (dest == null) dest = new short[factor * srcLength]; 166 } 167 else if (src instanceof int[]) 168 { 169 srcLength = ((int[]) src).length; 170 if (dest == null) dest = new int[factor * srcLength]; 171 } 172 else 173 { 174 throw new ClassCastException("Unknown data buffer type"); 175 } 176 177 System.arraycopy(src,0,dest,0,srcLength); 178 179 int count = 1; 180 while(count*2 < factor) 181 { 182 System.arraycopy(dest, 0, dest, count * srcLength, count*srcLength); 183 count *= 2; 184 } 185 186 if(factor > count) 187 System.arraycopy(dest,0, dest, count * srcLength, 188 (factor - count) * srcLength ); 189 190 return dest; 191 } 192 193 } 194 195 } // class ColorPaintContext 196