libjava/classpath/java/awt/image/ImageConsumer.java

   1 /* ImageConsumer.java -- Java interface for image consumption
   2    Copyright (C) 1999, 2003 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.image;
  40
  41 import java.util.Hashtable;
  42
  43 /**
  44  * An object implementing the <code>ImageProducer</code> interface can
  45  * use objects implementing this interface to deliver the image data.
  46  *
  47  * @author C. Brian Jones (cbj@gnu.org)
  48  */
  49 public interface ImageConsumer
  50 {
  51     /**
  52      * The pixel order may be random.  This should be
  53      * the default assumption of the <code>ImageConsumer</code>.
  54      *
  55      * @see #setHints
  56      */
  57     int RANDOMPIXELORDER = 1;
  58
  59     /**
  60      * The pixel order is top-down, left-right.
  61      *
  62      * @see #setHints
  63      */
  64     int TOPDOWNLEFTRIGHT = 2;
  65
  66     /**
  67      * The pixel order is in multiples of complete scanlines.
  68      *
  69      * @see #setHints
  70      */
  71     int COMPLETESCANLINES = 4;
  72
  73     /**
  74      * The pixels will be delivered in a single pass.  There is at
  75      * most one call to <code>setPixels</code> for any single pixel.
  76      *
  77      * @see #setHints
  78      * @see #setPixels(int, int, int, int, ColorModel, int[], int, int)
  79      */
  80     int SINGLEPASS = 8;
  81
  82     /**
  83      * The pixels will be delivered with multiple calls to
  84      * <code>setPixels</code>.  The image contains a single frame
  85      * which ends when <code>imageComplete</code> is called with the
  86      * <code>STATICIMAGEDONE</code> flag.  If the image is constantly
  87      * changing such as with video then the end of each frame is
  88      * marked by a similar call to <code>imageComplete</code> with the
  89      * <code>SINGLEFRAMEDONE</code> flag.
  90      *
  91      * @see #setHints
  92      * @see #imageComplete
  93      */
  94     int SINGLEFRAME = 16;
  95
  96     /**
  97      * Indicates an error occurred while producing an image.
  98      *
  99      * @see #imageComplete
 100      */
 101     int IMAGEERROR = 1;
 102
 103     /**
 104      * A single frame is complete but more will follow.
 105      *
 106      * @see #imageComplete
 107      */
 108     int SINGLEFRAMEDONE = 2;
 109
 110     /**
 111      * The image is complete and no more pixels or frames will follow.
 112      *
 113      * @see #imageComplete
 114      */
 115     int STATICIMAGEDONE = 3;
 116
 117     /**
 118      * Production of the image has been aborted.
 119      *
 120      * @see #imageComplete
 121      */
 122     int IMAGEABORTED = 4;
 123
 124     /**
 125      * An <code>ImageProducer</code> indicates the size of the image
 126      * being produced using this method.
 127      *
 128      * @param width the width of the image
 129      * @param height the height of the image
 130      */
 131     void setDimensions(int width, int height);
 132
 133     /**
 134      * An <code>ImageProducer</code> can set a list of properties
 135      * associated with this image by using this method.
 136      *
 137      * @param props the list of properties associated with this image
 138      */
 139     void setProperties(Hashtable props);
 140
 141     /**
 142      * This <code>ColorModel</code> should indicate the model used by
 143      * the majority of calls to <code>setPixels</code>.  Each call to
 144      * <code>setPixels</code> could however indicate a different
 145      * <code>ColorModel</code>.
 146      *
 147      * @param model the color model to be used most often by setPixels
 148      * @see ColorModel
 149      */
 150     void setColorModel(ColorModel model);
 151
 152     /**
 153      * The <code>ImageProducer</code> should call this method with a
 154      * bit mask of hints from any of <code>RANDOMPIXELORDER</code>,
 155      * <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>,
 156      * <code>SINGLEPASS</code>, <code>SINGLEFRAME</code>.
 157      *
 158      * @param flags a bit mask of hints
 159      */
 160     void setHints(int flags);
 161
 162     /**
 163      * Deliver a subset of an ImageProducer's pixels to this ImageConsumer.
 164      *
 165      * Each element of the pixels array represents one pixel.  The
 166      * pixel data is formatted according to the color model model.
 167      * The x and y parameters are the coordinates of the block of
 168      * pixels being delivered to this ImageConsumer.  They are
 169      * specified relative to the top left corner of the image being
 170      * produced.  Likewise, w and h are the pixel block's dimensions.
 171      *
 172      * @param x x coordinate of pixel block
 173      * @param y y coordinate of pixel block
 174      * @param w width of pixel block
 175      * @param h height of pixel block
 176      * @param model color model used to interpret pixel data
 177      * @param pixels pixel block data
 178      * @param offset offset into pixels array
 179      * @param scansize width of one row in the pixel block
 180      */
 181     void setPixels(int x, int y, int w, int h,
 182            ColorModel model, byte[] pixels, int offset, int scansize);
 183
 184     /**
 185      * Deliver a subset of an ImageProducer's pixels to this ImageConsumer.
 186      *
 187      * Each element of the pixels array represents one pixel.  The
 188      * pixel data is formatted according to the color model model.
 189      * The x and y parameters are the coordinates of the rectangular
 190      * region of pixels being delivered to this ImageConsumer,
 191      * specified relative to the top left corner of the image being
 192      * produced.  Likewise, w and h are the pixel region's dimensions.
 193      *
 194      * @param x x coordinate of pixel block
 195      * @param y y coordinate of pixel block
 196      * @param w width of pixel block
 197      * @param h height of pixel block
 198      * @param model color model used to interpret pixel data
 199      * @param pixels pixel block data
 200      * @param offset offset into pixels array
 201      * @param scansize width of one row in the pixel block
 202      */
 203     void setPixels(int x, int y, int w, int h,
 204            ColorModel model, int[] pixels, int offset, int scansize);
 205
 206     /**
 207      * The <code>ImageProducer</code> calls this method to indicate a
 208      * single frame or the entire image is complete.  The method is
 209      * also used to indicate an error in loading or producing the
 210      * image.
 211      *
 212      * @param status the status of image production, represented by a
 213      * bitwise OR of ImageConsumer flags
 214      */
 215     void imageComplete(int status);
 216 }