| /* ColorPaintContext.java -- context for painting solid colors |
| Copyright (C) 2002, 2004, 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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; |
| |
| import java.awt.image.ColorModel; |
| import java.awt.image.Raster; |
| |
| /** |
| * This class provides a paint context which will fill a rectanglar region of |
| * a raster scan with the given color. However, it is not yet completely |
| * implemented. |
| * |
| * @author Eric Blake (ebb9@email.byu.edu) |
| */ |
| class ColorPaintContext implements PaintContext |
| { |
| /** |
| * The color to fill any raster with. Package visible for use in |
| * SystemColor. |
| */ |
| final int color; |
| final ColorModel colorModel; |
| |
| private ColorRaster cachedRaster; |
| |
| |
| /** |
| * Create the context for a given color. |
| * |
| * @param c The solid color to use. |
| */ |
| ColorPaintContext(int colorRGB) |
| { |
| this(ColorModel.getRGBdefault(), colorRGB); |
| } |
| |
| /** |
| * Create the context for a given color. |
| * |
| * @param cm The color model of this context. |
| * @param c The solid color to use. |
| */ |
| ColorPaintContext(ColorModel cm,int colorRGB) |
| { |
| color = colorRGB; |
| colorModel = cm; |
| } |
| |
| /** |
| * Release the resources allocated for the paint. As the color is constant, |
| * there aren't any resources. |
| */ |
| public void dispose() |
| { |
| } |
| |
| /** |
| * Return the color model of this context. |
| * |
| * @return the context color model |
| */ |
| public ColorModel getColorModel() |
| { |
| return colorModel; |
| } |
| |
| /** |
| * Return a raster containing the colors for the graphics operation. |
| * |
| * @param x the x-coordinate, in device space |
| * @param y the y-coordinate, in device space |
| * @param w the width, in device space |
| * @param h the height, in device space |
| * @return a raster for the given area and color |
| */ |
| public Raster getRaster(int x, int y, int width, int height) |
| { |
| if( cachedRaster == null |
| || cachedRaster.getWidth() < width |
| || cachedRaster.getHeight() < height) |
| { |
| cachedRaster = new ColorRaster(colorModel, 0, 0, width, height, color); |
| } |
| return cachedRaster.createChild(0 ,0 ,width ,height ,x ,y , null); |
| } |
| |
| /** |
| * A ColorRaster is a raster that is completely filled with one color. The |
| * data layout is taken from the color model given to the constructor. |
| */ |
| private class ColorRaster extends Raster |
| { |
| |
| /** |
| * Create a raster that is compaltible with the given color model and |
| * filled with the given color. |
| * @param cm The color model for this raster. |
| * @param x The smallest horizontal corrdinate in the raster. |
| * @param y The smallest vertical coordinate in the raster. |
| * @param width The width of the raster. |
| * @param height The height of the raster. |
| * @param rgbPixel The RGB value of the color for this raster. |
| */ |
| ColorRaster(ColorModel cm,int x, int y, int width, int height, int rgbPixel) |
| { |
| super(cm.createCompatibleSampleModel(width,height),new Point(x,y)); |
| Object pixel = cm.getDataElements(rgbPixel,null); |
| getSampleModel().setDataElements(0, 0, |
| width, height, |
| multiplyData(pixel,null,width*height), |
| dataBuffer); |
| } |
| |
| |
| |
| private Object multiplyData(Object src, Object dest, int factor) |
| { |
| Object from; |
| int srcLength = 0; |
| if (src instanceof byte[]) |
| { |
| srcLength = ((byte[])src).length; |
| |
| if (dest == null) dest = new byte[factor * srcLength]; |
| } |
| else if (src instanceof short[]) |
| { |
| srcLength = ((short[])src).length; |
| if (dest == null) dest = new short[factor * srcLength]; |
| } |
| else if (src instanceof int[]) |
| { |
| srcLength = ((int[]) src).length; |
| if (dest == null) dest = new int[factor * srcLength]; |
| } |
| else |
| { |
| throw new ClassCastException("Unknown data buffer type"); |
| } |
| |
| System.arraycopy(src,0,dest,0,srcLength); |
| |
| int count = 1; |
| while(count*2 < factor) |
| { |
| System.arraycopy(dest, 0, dest, count * srcLength, count*srcLength); |
| count *= 2; |
| } |
| |
| if(factor > count) |
| System.arraycopy(dest,0, dest, count * srcLength, |
| (factor - count) * srcLength ); |
| |
| return dest; |
| } |
| |
| } |
| |
| } // class ColorPaintContext |