1 /*
   2  * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.awt.image;
  27 
  28 import java.awt.Component;
  29 import java.awt.Graphics2D;
  30 import java.awt.GraphicsConfiguration;
  31 import java.awt.GraphicsDevice;
  32 import java.awt.Rectangle;
  33 import java.awt.Transparency;
  34 import java.awt.geom.AffineTransform;
  35 import java.awt.image.BufferedImage;
  36 import java.awt.image.ColorModel;
  37 import java.awt.image.DirectColorModel;
  38 import java.awt.image.Raster;
  39 import java.awt.image.WritableRaster;
  40 
  41 public class BufferedImageGraphicsConfig
  42     extends GraphicsConfiguration
  43 {
  44     private static final int numconfigs = BufferedImage.TYPE_BYTE_BINARY;
  45     private static BufferedImageGraphicsConfig configs[] =
  46         new BufferedImageGraphicsConfig[numconfigs];
  47 
  48     public static BufferedImageGraphicsConfig getConfig(BufferedImage bImg) {
  49         BufferedImageGraphicsConfig ret;
  50         int type = bImg.getType();
  51         if (type > 0 && type < numconfigs) {
  52             ret = configs[type];
  53             if (ret != null) {
  54                 return ret;
  55             }
  56         }
  57         if (bImg instanceof OffScreenImage) {
  58             ret = ((OffScreenImage)bImg).new GraphicsConfig();
  59         } else {
  60             ret = new BufferedImageGraphicsConfig(bImg, null);
  61         }
  62         if (type > 0 && type < numconfigs) {
  63             configs[type] = ret;
  64         }
  65         return ret;
  66     }
  67     
  68     GraphicsDevice gd;
  69     ColorModel model;
  70     Raster raster;
  71     int width, height;
  72 
  73     public BufferedImageGraphicsConfig(BufferedImage bufImg, Component comp) {
  74         if (comp == null) {
  75             this.gd = new BufferedImageDevice(this);
  76         } else {
  77             Graphics2D g2d = (Graphics2D)comp.getGraphics();
  78             this.gd = g2d.getDeviceConfiguration().getDevice();
  79         }
  80         this.model = bufImg.getColorModel();
  81         this.raster = bufImg.getRaster().createCompatibleWritableRaster(1, 1);
  82         this.width = bufImg.getWidth();
  83         this.height = bufImg.getHeight();
  84     }
  85 
  86     /**
  87      * Return the graphics device associated with this configuration.
  88      */
  89     public GraphicsDevice getDevice() {
  90         return gd;
  91     }
  92     
  93     /**
  94      * Returns a BufferedImage with channel layout and color model
  95      * compatible with this graphics configuration.  This method
  96      * has nothing to do with memory-mapping
  97      * a device.  This BufferedImage has
  98      * a layout and color model
  99      * that is closest to this native device configuration and thus
 100      * can be optimally blitted to this device.
 101      */
 102     public BufferedImage createCompatibleImage(int width, int height) {
 103         WritableRaster wr = raster.createCompatibleWritableRaster(width, height);
 104         return new BufferedImage(model, wr, model.isAlphaPremultiplied(), null);
 105     }
 106     
 107     /**
 108      * Returns the color model associated with this configuration.
 109      */
 110     public ColorModel getColorModel() {
 111         return model;
 112     }
 113 
 114     /**
 115      * Returns the color model associated with this configuration that
 116      * supports the specified transparency.
 117      */
 118     public ColorModel getColorModel(int transparency) {
 119 
 120         if (model.getTransparency() == transparency) {
 121             return model;
 122         }
 123         switch (transparency) {
 124         case Transparency.OPAQUE:
 125             return new DirectColorModel(24, 0xff0000, 0xff00, 0xff);
 126         case Transparency.BITMASK:
 127             return new DirectColorModel(25, 0xff0000, 0xff00, 0xff, 0x1000000);
 128         case Transparency.TRANSLUCENT:
 129             return ColorModel.getRGBdefault();
 130         default:
 131             return null;
 132         }
 133     }
 134 
 135     /**
 136      * Returns the default Transform for this configuration.  This
 137      * Transform is typically the Identity transform for most normal
 138      * screens.  Device coordinates for screen and printer devices will
 139      * have the origin in the upper left-hand corner of the target region of
 140      * the device, with X coordinates
 141      * increasing to the right and Y coordinates increasing downwards.
 142      * For image buffers, this Transform will be the Identity transform.
 143      */
 144     public AffineTransform getDefaultTransform() {
 145         return new AffineTransform();
 146     }
 147 
 148     /**
 149      *
 150      * Returns a Transform that can be composed with the default Transform
 151      * of a Graphics2D so that 72 units in user space will equal 1 inch
 152      * in device space.
 153      * Given a Graphics2D, g, one can reset the transformation to create
 154      * such a mapping by using the following pseudocode:
 155      * <pre>
 156      *      GraphicsConfiguration gc = g.getGraphicsConfiguration();
 157      *
 158      *      g.setTransform(gc.getDefaultTransform());
 159      *      g.transform(gc.getNormalizingTransform());
 160      * </pre>
 161      * Note that sometimes this Transform will be identity (e.g. for
 162      * printers or metafile output) and that this Transform is only
 163      * as accurate as the information supplied by the underlying system.
 164      * For image buffers, this Transform will be the Identity transform,
 165      * since there is no valid distance measurement.
 166      */
 167     public AffineTransform getNormalizingTransform() {
 168         return new AffineTransform();
 169     }
 170 
 171     public Rectangle getBounds() {
 172         return new Rectangle(0, 0, width, height);
 173     }
 174 }