1 /*
   2  * Copyright (c) 1997, 2016, 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 import java.awt.image.Raster;
  28 import java.awt.image.WritableRaster;
  29 import java.awt.image.RasterFormatException;
  30 import java.awt.image.SampleModel;
  31 import java.awt.image.SinglePixelPackedSampleModel;
  32 import java.awt.image.DataBufferInt;
  33 import java.awt.Rectangle;
  34 import java.awt.Point;
  35 
  36 /**
  37  * This class defines a Raster with pixels consisting of one or more 32-bit
  38  * data elements stored in close proximity to each other in a integer array.
  39  * The bit precision per data element is that
  40  * of the data type (that is, the bit precision for this raster is 32).
  41  * There is only one pixel stride and one scanline stride for all
  42  * bands.  For a given pixel, all samples fit in N data elements and these
  43  * N data elements hold samples for only one pixel.  This type of Raster
  44  * can be used with a PackedColorModel.
  45  * <p>
  46  * For example, if there is only one data element per pixel, a
  47  * SinglePixelPackedSampleModel can be used to represent multiple
  48  * bands with a PackedColorModel (including a DirectColorModel) for
  49  * color interpretation.
  50  *
  51  */
  52 public class IntegerComponentRaster extends SunWritableRaster {
  53 
  54     static final int TYPE_CUSTOM                = 0;
  55     static final int TYPE_BYTE_SAMPLES          = 1;
  56     static final int TYPE_USHORT_SAMPLES        = 2;
  57     static final int TYPE_INT_SAMPLES           = 3;
  58     static final int TYPE_BYTE_BANDED_SAMPLES   = 4;
  59     static final int TYPE_USHORT_BANDED_SAMPLES = 5;
  60     static final int TYPE_INT_BANDED_SAMPLES    = 6;
  61     static final int TYPE_BYTE_PACKED_SAMPLES   = 7;
  62     static final int TYPE_USHORT_PACKED_SAMPLES = 8;
  63     static final int TYPE_INT_PACKED_SAMPLES    = 9;
  64     static final int TYPE_INT_8BIT_SAMPLES      = 10;
  65     static final int TYPE_BYTE_BINARY_SAMPLES   = 11;
  66 
  67     /** private band offset for use by native code */
  68     protected int bandOffset;
  69 
  70     /** Data offsets for each band of image data. */
  71     protected int[]         dataOffsets;
  72 
  73     /** Scanline stride of the image data contained in this Raster. */
  74     protected int           scanlineStride;
  75 
  76     /** Pixel stride of the image data contained in this Raster. */
  77     protected int           pixelStride;
  78 
  79     /** The image data array. */
  80     protected int[]         data;
  81 
  82     /** The number of data elements required to store a pixel. */
  83     protected int           numDataElems;
  84 
  85     int type;
  86 
  87     /** A cached copy of minX + width for use in bounds checks. */
  88     private int maxX;
  89 
  90     /** A cached copy of minY + height for use in bounds checks. */
  91     private int maxY;
  92 
  93     private static native void initIDs();
  94     static {
  95         /* ensure that the necessary native libraries are loaded */
  96         NativeLibLoader.loadLibraries();
  97         initIDs();
  98     }
  99 
 100     /**
 101      *  Constructs a IntegerComponentRaster with the given SampleModel.
 102      *  The Raster's upper left corner is origin and it is the same
 103      *  size as the SampleModel.  A DataBuffer large enough to describe the
 104      *  Raster is automatically created.  SampleModel must be of type
 105      *  SinglePixelPackedSampleModel.
 106      *  @param sampleModel     The SampleModel that specifies the layout.
 107      *  @param origin          The Point that specified the origin.
 108      */
 109     public IntegerComponentRaster(SampleModel sampleModel, Point origin) {
 110         this(sampleModel,
 111              (DataBufferInt) sampleModel.createDataBuffer(),
 112              new Rectangle(origin.x,
 113                            origin.y,
 114                            sampleModel.getWidth(),
 115                            sampleModel.getHeight()),
 116              origin,
 117              null);
 118     }
 119 
 120     /**
 121      * Constructs a IntegerComponentRaster with the given SampleModel
 122      * and DataBuffer.  The Raster's upper left corner is origin and
 123      * it is the same sizes the SampleModel.  The DataBuffer is not
 124      * initialized and must be a DataBufferInt compatible with SampleModel.
 125      * SampleModel must be of type SinglePixelPackedSampleModel.
 126      * @param sampleModel     The SampleModel that specifies the layout.
 127      * @param dataBuffer      The DataBufferInt that contains the image data.
 128      * @param origin          The Point that specifies the origin.
 129      */
 130     public IntegerComponentRaster(SampleModel sampleModel,
 131                                   DataBufferInt dataBuffer,
 132                                   Point origin)
 133     {
 134         this(sampleModel,
 135              dataBuffer,
 136              new Rectangle(origin.x,
 137                            origin.y,
 138                            sampleModel.getWidth(),
 139                            sampleModel.getHeight()),
 140              origin,
 141              null);
 142     }
 143 
 144    /**
 145      * Constructs a IntegerComponentRaster with the given SampleModel,
 146      * DataBuffer, and parent.  DataBuffer must be a DataBufferInt and
 147      * SampleModel must be of type SinglePixelPackedSampleModel.
 148      * When translated into the base Raster's
 149      * coordinate system, aRegion must be contained by the base Raster.
 150      * Origin is the coodinate in the new Raster's coordinate system of
 151      * the origin of the base Raster.  (The base Raster is the Raster's
 152      * ancestor which has no parent.)
 153      *
 154      * Note that this constructor should generally be called by other
 155      * constructors or create methods, it should not be used directly.
 156      * @param sampleModel     The SampleModel that specifies the layout.
 157      * @param dataBuffer      The DataBufferInt that contains the image data.
 158      * @param aRegion         The Rectangle that specifies the image area.
 159      * @param origin          The Point that specifies the origin.
 160      * @param parent          The parent (if any) of this raster.
 161      */
 162     public IntegerComponentRaster(SampleModel sampleModel,
 163                                   DataBufferInt dataBuffer,
 164                                   Rectangle aRegion,
 165                                   Point origin,
 166                                   IntegerComponentRaster parent)
 167     {
 168         super(sampleModel,dataBuffer,aRegion,origin,parent);
 169         this.maxX = minX + width;
 170         this.maxY = minY + height;
 171 
 172         if (dataBuffer.getNumBanks() != 1) {
 173             throw new
 174                 RasterFormatException("DataBuffer for IntegerComponentRasters"+
 175                                       " must only have 1 bank.");
 176         }
 177         this.data = stealData(dataBuffer, 0);
 178 
 179         if (sampleModel instanceof SinglePixelPackedSampleModel) {
 180             SinglePixelPackedSampleModel sppsm =
 181                     (SinglePixelPackedSampleModel)sampleModel;
 182             int[] boffsets = sppsm.getBitOffsets();
 183             boolean notByteBoundary = false;
 184             for (int i=1; i < boffsets.length; i++) {
 185                 if ((boffsets[i]%8) != 0) {
 186                     notByteBoundary = true;
 187                 }
 188             }
 189             this.type = (notByteBoundary
 190                          ? IntegerComponentRaster.TYPE_INT_PACKED_SAMPLES
 191                          : IntegerComponentRaster.TYPE_INT_8BIT_SAMPLES);
 192 
 193             this.scanlineStride = sppsm.getScanlineStride();
 194             this.pixelStride    = 1;
 195             this.dataOffsets = new int[1];
 196             this.dataOffsets[0] = dataBuffer.getOffset();
 197             this.bandOffset = this.dataOffsets[0];
 198             int xOffset = aRegion.x - origin.x;
 199             int yOffset = aRegion.y - origin.y;
 200             dataOffsets[0] += xOffset+yOffset*scanlineStride;
 201             this.numDataElems = sppsm.getNumDataElements();
 202         } else {
 203             throw new RasterFormatException("IntegerComponentRasters must have"+
 204                                             " SinglePixelPackedSampleModel");
 205         }
 206 
 207         verify();
 208     }
 209 
 210 
 211     /**
 212      * Returns a copy of the data offsets array. For each band the data offset
 213      * is the index into the band's data array, of the first sample of the
 214      * band.
 215      */
 216     public int[] getDataOffsets() {
 217         return dataOffsets.clone();
 218     }
 219 
 220     /**
 221      * Returns data offset for the specified band.  The data offset
 222      * is the index into the data array in which the first sample
 223      * of the first scanline is stored.
 224      */
 225     public int getDataOffset(int band) {
 226         return dataOffsets[band];
 227     }
 228 
 229 
 230     /**
 231      * Returns the scanline stride -- the number of data array elements between
 232      * a given sample and the sample in the same column of the next row.
 233      */
 234     public int getScanlineStride() {
 235         return scanlineStride;
 236     }
 237 
 238     /**
 239      * Returns pixel stride -- the number of data array elements  between two
 240      * samples for the same band on the same scanline.
 241      */
 242     public int getPixelStride() {
 243         return pixelStride;
 244     }
 245 
 246     /**
 247      * Returns a reference to the data array.
 248      */
 249     public int[] getDataStorage() {
 250         return data;
 251     }
 252 
 253     /**
 254      * Returns the data elements for all bands at the specified
 255      * location.
 256      * An ArrayIndexOutOfBounds exception will be thrown at runtime
 257      * if the pixel coordinate is out of bounds.
 258      * A ClassCastException will be thrown if the input object is non null
 259      * and references anything other than an array of transferType.
 260      * @param x        The X coordinate of the pixel location.
 261      * @param y        The Y coordinate of the pixel location.
 262      * @param obj      An object reference to an array of type defined by
 263      *                 getTransferType() and length getNumDataElements().
 264      *                 If null an array of appropriate type and size will be
 265      *                 allocated.
 266      * @return         An object reference to an array of type defined by
 267      *                 getTransferType() with the request pixel data.
 268      */
 269     public Object getDataElements(int x, int y, Object obj) {
 270         if ((x < this.minX) || (y < this.minY) ||
 271             (x >= this.maxX) || (y >= this.maxY)) {
 272             throw new ArrayIndexOutOfBoundsException
 273                 ("Coordinate out of bounds!");
 274         }
 275         int outData[];
 276         if (obj == null) {
 277             outData = new int[numDataElements];
 278         } else {
 279             outData = (int[])obj;
 280         }
 281         int off = (y-minY)*scanlineStride +
 282                   (x-minX)*pixelStride;
 283         for (int band = 0; band < numDataElements; band++) {
 284             outData[band] = data[dataOffsets[band] + off];
 285         }
 286 
 287         return outData;
 288     }
 289 
 290 
 291     /**
 292      * Returns an array  of data elements from the specified rectangular
 293      * region.
 294      * An ArrayIndexOutOfBounds exception will be thrown at runtime
 295      * if the pixel coordinates are out of bounds.
 296      * A ClassCastException will be thrown if the input object is non null
 297      * and references anything other than an array of transferType.
 298      <pre>
 299      *       int[] bandData = (int[])raster.getDataElements(x, y, w, h, null);
 300      *       int numDataElements = raster.getNumDataElements();
 301      *       int[] pixel = new int[numDataElements];
 302      *       // To find a data element at location (x2, y2)
 303      *       System.arraycopy(bandData, ((y2-y)*w + (x2-x))*numDataElements,
 304      *                        pixel, 0, numDataElements);
 305      * </pre>
 306      * @param x        The X coordinate of the upper left pixel location.
 307      * @param y        The Y coordinate of the upper left pixel location.
 308      * @param w        Width of the pixel rectangle.
 309      * @param h        Height of the pixel rectangle.
 310      * @param obj      An object reference to an array of type defined by
 311      *                 getTransferType() and length w*h*getNumDataElements().
 312      *                 If null an array of appropriate type and size will be
 313      *                 allocated.
 314      * @return         An object reference to an array of type defined by
 315      *                 getTransferType() with the request pixel data.
 316      */
 317     public Object getDataElements(int x, int y, int w, int h, Object obj) {
 318         if ((x < this.minX) || (y < this.minY) ||
 319             (x + w > this.maxX) || (y + h > this.maxY)) {
 320             throw new ArrayIndexOutOfBoundsException
 321                 ("Coordinate out of bounds!");
 322         }
 323         int outData[];
 324         if (obj instanceof int[]) {
 325             outData = (int[])obj;
 326         } else {
 327             outData = new int[numDataElements*w*h];
 328         }
 329         int yoff = (y-minY)*scanlineStride +
 330                    (x-minX)*pixelStride;
 331         int xoff;
 332         int off = 0;
 333         int xstart;
 334         int ystart;
 335 
 336         for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
 337             xoff = yoff;
 338             for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
 339                 for (int c = 0; c < numDataElements; c++) {
 340                     outData[off++] = data[dataOffsets[c] + xoff];
 341                 }
 342             }
 343         }
 344 
 345         return outData;
 346     }
 347 
 348 
 349     /**
 350      * Stores the data elements for all bands at the specified location.
 351      * An ArrayIndexOutOfBounds exception will be thrown at runtime
 352      * if the pixel coordinate is out of bounds.
 353      * A ClassCastException will be thrown if the input object is non null
 354      * and references anything other than an array of transferType.
 355      * @param x        The X coordinate of the pixel location.
 356      * @param y        The Y coordinate of the pixel location.
 357      * @param obj      An object reference to an array of type defined by
 358      *                 getTransferType() and length getNumDataElements()
 359      *                 containing the pixel data to place at x,y.
 360      */
 361     public void setDataElements(int x, int y, Object obj) {
 362         if ((x < this.minX) || (y < this.minY) ||
 363             (x >= this.maxX) || (y >= this.maxY)) {
 364             throw new ArrayIndexOutOfBoundsException
 365                 ("Coordinate out of bounds!");
 366         }
 367         int inData[] = (int[])obj;
 368 
 369         int off = (y-minY)*scanlineStride +
 370                   (x-minX)*pixelStride;
 371 
 372         for (int i = 0; i < numDataElements; i++) {
 373             data[dataOffsets[i] + off] = inData[i];
 374         }
 375 
 376         markDirty();
 377     }
 378 
 379 
 380     /**
 381      * Stores the Raster data at the specified location.
 382      * The transferType of the inputRaster must match this raster.
 383      * An ArrayIndexOutOfBoundsException will be thrown at runtime
 384      * if the pixel coordinates are out of bounds.
 385      * @param x          The X coordinate of the pixel location.
 386      * @param y          The Y coordinate of the pixel location.
 387      * @param inRaster   Raster of data to place at x,y location.
 388      */
 389     public void setDataElements(int x, int y, Raster inRaster) {
 390         int dstOffX = x + inRaster.getMinX();
 391         int dstOffY = y + inRaster.getMinY();
 392         int width  = inRaster.getWidth();
 393         int height = inRaster.getHeight();
 394         if ((dstOffX < this.minX) || (dstOffY < this.minY) ||
 395             (dstOffX + width > this.maxX) || (dstOffY + height > this.maxY)) {
 396             throw new ArrayIndexOutOfBoundsException
 397                 ("Coordinate out of bounds!");
 398         }
 399         setDataElements(dstOffX, dstOffY, width, height, inRaster);
 400     }
 401 
 402     /**
 403      * Stores the Raster data at the specified location.
 404      * @param dstX The absolute X coordinate of the destination pixel
 405      * that will receive a copy of the upper-left pixel of the
 406      * inRaster
 407      * @param dstY The absolute Y coordinate of the destination pixel
 408      * that will receive a copy of the upper-left pixel of the
 409      * inRaster
 410      * @param width      The number of pixels to store horizontally
 411      * @param height     The number of pixels to store vertically
 412      * @param inRaster   Raster of data to place at x,y location.
 413      */
 414     private void setDataElements(int dstX, int dstY,
 415                                  int width, int height,
 416                                  Raster inRaster) {
 417         // Assume bounds checking has been performed previously
 418         if (width <= 0 || height <= 0) {
 419             return;
 420         }
 421 
 422         // Write inRaster (minX, minY) to (dstX, dstY)
 423 
 424         int srcOffX = inRaster.getMinX();
 425         int srcOffY = inRaster.getMinY();
 426         int tdata[] = null;
 427 
 428         if (inRaster instanceof IntegerComponentRaster &&
 429             (pixelStride == 1) && (numDataElements == 1)) {
 430             IntegerComponentRaster ict = (IntegerComponentRaster) inRaster;
 431             if (ict.getNumDataElements() != 1) {
 432                 throw new ArrayIndexOutOfBoundsException("Number of bands"+
 433                                                          " does not match");
 434             }
 435 
 436             // Extract the raster parameters
 437             tdata    = ict.getDataStorage();
 438             int tss  = ict.getScanlineStride();
 439             int toff = ict.getDataOffset(0);
 440 
 441             int srcOffset = toff;
 442 
 443             int dstOffset = dataOffsets[0]+(dstY-minY)*scanlineStride+
 444                                            (dstX-minX);
 445 
 446 
 447             // Fastest case.  We can copy scanlines
 448             if (ict.getPixelStride() == pixelStride) {
 449                 width *= pixelStride;
 450 
 451                 // Loop through all of the scanlines and copy the data
 452                 for (int startY=0; startY < height; startY++) {
 453                     System.arraycopy(tdata, srcOffset, data, dstOffset, width);
 454                     srcOffset += tss;
 455                     dstOffset += scanlineStride;
 456                 }
 457                 markDirty();
 458                 return;
 459             }
 460         }
 461 
 462         Object odata = null;
 463         for (int startY=0; startY < height; startY++) {
 464             odata = inRaster.getDataElements(srcOffX, srcOffY+startY,
 465                                              width, 1, odata);
 466             setDataElements(dstX, dstY+startY,
 467                             width, 1, odata);
 468         }
 469     }
 470 
 471     /**
 472      * Stores an array of data elements into the specified rectangular
 473      * region.
 474      * An ArrayIndexOutOfBounds exception will be thrown at runtime
 475      * if the pixel coordinates are out of bounds.
 476      * A ClassCastException will be thrown if the input object is non null
 477      * and references anything other than an array of transferType.
 478      * The data elements in the
 479      * data array are assumed to be packed.  That is, a data element
 480      * for the nth band at location (x2, y2) would be found at:
 481      * <pre>
 482      *      inData[((y2-y)*w + (x2-x))*numDataElements + n]
 483      * </pre>
 484      * @param x        The X coordinate of the upper left pixel location.
 485      * @param y        The Y coordinate of the upper left pixel location.
 486      * @param w        Width of the pixel rectangle.
 487      * @param h        Height of the pixel rectangle.
 488      * @param obj      An object reference to an array of type defined by
 489      *                 getTransferType() and length w*h*getNumDataElements()
 490      *                 containing the pixel data to place between x,y and
 491      *                 x+h, y+h.
 492      */
 493     public void setDataElements(int x, int y, int w, int h, Object obj) {
 494         if ((x < this.minX) || (y < this.minY) ||
 495             (x + w > this.maxX) || (y + h > this.maxY)) {
 496             throw new ArrayIndexOutOfBoundsException
 497                 ("Coordinate out of bounds!");
 498         }
 499         int inData[] = (int[])obj;
 500 
 501         int yoff = (y-minY)*scanlineStride +
 502                    (x-minX)*pixelStride;
 503         int xoff;
 504         int off = 0;
 505         int xstart;
 506         int ystart;
 507 
 508         for (ystart=0; ystart < h; ystart++, yoff += scanlineStride) {
 509             xoff = yoff;
 510             for (xstart=0; xstart < w; xstart++, xoff += pixelStride) {
 511                 for (int c = 0; c < numDataElements; c++) {
 512                     data[dataOffsets[c] + xoff] = inData[off++];
 513                 }
 514             }
 515         }
 516 
 517         markDirty();
 518     }
 519 
 520 
 521     /**
 522      * Creates a subraster given a region of the raster.  The x and y
 523      * coordinates specify the horizontal and vertical offsets
 524      * from the upper-left corner of this raster to the upper-left corner
 525      * of the subraster.  A subset of the bands of the parent Raster may
 526      * be specified.  If this is null, then all the bands are present in the
 527      * subRaster. A translation to the subRaster may also be specified.
 528      * Note that the subraster will reference the same
 529      * DataBuffer as the parent raster, but using different offsets.
 530      * @param x               X offset.
 531      * @param y               Y offset.
 532      * @param width           Width (in pixels) of the subraster.
 533      * @param height          Height (in pixels) of the subraster.
 534      * @param x0              Translated X origin of the subraster.
 535      * @param y0              Translated Y origin of the subraster.
 536      * @param bandList        Array of band indices.
 537      * @exception RasterFormatException
 538      *            if the specified bounding box is outside of the parent raster.
 539      */
 540     public WritableRaster createWritableChild (int x, int y,
 541                                                int width, int height,
 542                                                int x0, int y0,
 543                                                int bandList[]) {
 544         if (x < this.minX) {
 545             throw new RasterFormatException("x lies outside raster");
 546         }
 547         if (y < this.minY) {
 548             throw new RasterFormatException("y lies outside raster");
 549         }
 550         if ((x+width < x) || (x+width > this.minX + this.width)) {
 551             throw new RasterFormatException("(x + width) is outside raster");
 552         }
 553         if ((y+height < y) || (y+height > this.minY + this.height)) {
 554             throw new RasterFormatException("(y + height) is outside raster");
 555         }
 556 
 557         SampleModel sm;
 558 
 559         if (bandList != null)
 560             sm = sampleModel.createSubsetSampleModel(bandList);
 561         else
 562             sm = sampleModel;
 563 
 564         int deltaX = x0 - x;
 565         int deltaY = y0 - y;
 566 
 567         return new IntegerComponentRaster(sm,
 568                                           (DataBufferInt) dataBuffer,
 569                                           new Rectangle(x0,y0,width,height),
 570                                           new Point(sampleModelTranslateX+deltaX,
 571                                                     sampleModelTranslateY+deltaY),
 572                                           this);
 573     }
 574 
 575 
 576     /**
 577      * Creates a subraster given a region of the raster.  The x and y
 578      * coordinates specify the horizontal and vertical offsets
 579      * from the upper-left corner of this raster to the upper-left corner
 580      * of the subraster.  A subset of the bands of the parent raster may
 581      * be specified. If this is null, then all the bands are present in the
 582      * subRaster. Note that the subraster will reference the same
 583      * DataBuffer as the parent raster, but using different offsets.
 584      * @param x               X offset.
 585      * @param y               Y offset.
 586      * @param width           Width (in pixels) of the subraster.
 587      * @param height          Height (in pixels) of the subraster.
 588      * @param x0              Translated X origin of the subRaster.
 589      * @param y0              Translated Y origin of the subRaster.
 590      * @param bandList        Array of band indices.
 591      * @exception RasterFormatException
 592      *            if the specified bounding box is outside of the parent raster.
 593      */
 594     public Raster createChild (int x, int y,
 595                                int width, int height,
 596                                int x0, int y0,
 597                                int bandList[]) {
 598         return createWritableChild(x, y, width, height, x0, y0, bandList);
 599     }
 600 
 601 
 602     /**
 603      * Creates a raster with the same band layout but using a different
 604      * width and height, and with new zeroed data arrays.
 605      */
 606     public WritableRaster createCompatibleWritableRaster(int w, int h) {
 607         if (w <= 0 || h <=0) {
 608             throw new RasterFormatException("negative "+
 609                                           ((w <= 0) ? "width" : "height"));
 610         }
 611 
 612         SampleModel sm = sampleModel.createCompatibleSampleModel(w,h);
 613 
 614         return new IntegerComponentRaster(sm, new Point(0,0));
 615     }
 616 
 617     /**
 618      * Creates a raster with the same data layout and the same
 619      * width and height, and with new zeroed data arrays.  If
 620      * the raster is a subraster, this will call
 621      * createCompatibleRaster(width, height).
 622      */
 623     public WritableRaster createCompatibleWritableRaster() {
 624         return createCompatibleWritableRaster(width,height);
 625     }
 626 
 627     /**
 628      * Verify that the layout parameters are consistent with the data.
 629      *
 630      * The method verifies whether scanline stride and pixel stride do not
 631      * cause an integer overflow during calculation of a position of the pixel
 632      * in data buffer. It also verifies whether the data buffer has enough data
 633      *  to correspond the raster layout attributes.
 634      *
 635      * @throws RasterFormatException if an integer overflow is detected,
 636      * or if data buffer has not enough capacity.
 637      */
 638     protected final void verify() {
 639         /* Need to re-verify the dimensions since a sample model may be
 640          * specified to the constructor
 641          */
 642         if (width <= 0 || height <= 0 ||
 643             height > (Integer.MAX_VALUE / width))
 644         {
 645             throw new RasterFormatException("Invalid raster dimension");
 646         }
 647 
 648         if (dataOffsets[0] < 0) {
 649             throw new RasterFormatException("Data offset ("+dataOffsets[0]+
 650                                             ") must be >= 0");
 651         }
 652 
 653         if ((long)minX - sampleModelTranslateX < 0 ||
 654             (long)minY - sampleModelTranslateY < 0) {
 655 
 656             throw new RasterFormatException("Incorrect origin/translate: (" +
 657                     minX + ", " + minY + ") / (" +
 658                     sampleModelTranslateX + ", " + sampleModelTranslateY + ")");
 659         }
 660 
 661         // we can be sure that width and height are greater than 0
 662         if (scanlineStride < 0 ||
 663             scanlineStride > (Integer.MAX_VALUE / height))
 664         {
 665             // integer overflow
 666             throw new RasterFormatException("Incorrect scanline stride: "
 667                     + scanlineStride);
 668         }
 669 
 670         if (height > 1 || minY - sampleModelTranslateY > 0) {
 671             // buffer should contain at least one scanline
 672             if (scanlineStride > data.length) {
 673                 throw new RasterFormatException("Incorrect scanline stride: "
 674                         + scanlineStride);
 675             }
 676         }
 677 
 678         int lastScanOffset = (height - 1) * scanlineStride;
 679 
 680         if (pixelStride < 0 ||
 681             pixelStride > (Integer.MAX_VALUE / width) ||
 682             pixelStride > data.length)
 683         {
 684             // integer overflow
 685             throw new RasterFormatException("Incorrect pixel stride: "
 686                     + pixelStride);
 687         }
 688         int lastPixelOffset = (width - 1) * pixelStride;
 689 
 690         if (lastPixelOffset > (Integer.MAX_VALUE - lastScanOffset)) {
 691             // integer overflow
 692             throw new RasterFormatException("Incorrect raster attributes");
 693         }
 694         lastPixelOffset += lastScanOffset;
 695 
 696         int index;
 697         int maxIndex = 0;
 698         for (int i = 0; i < numDataElements; i++) {
 699             if (dataOffsets[i] > (Integer.MAX_VALUE - lastPixelOffset)) {
 700                 throw new RasterFormatException("Incorrect band offset: "
 701                             + dataOffsets[i]);
 702             }
 703 
 704             index = lastPixelOffset + dataOffsets[i];
 705 
 706             if (index > maxIndex) {
 707                 maxIndex = index;
 708             }
 709         }
 710         if (data.length <= maxIndex) {
 711             throw new RasterFormatException("Data array too small (should be > "
 712                     + maxIndex + " )");
 713         }
 714     }
 715 
 716     public String toString() {
 717         return new String ("IntegerComponentRaster: width = "+width
 718                            +" height = " + height
 719                            +" #Bands = " + numBands
 720                            +" #DataElements "+numDataElements
 721                            +" xOff = "+sampleModelTranslateX
 722                            +" yOff = "+sampleModelTranslateY
 723                            +" dataOffset[0] "+dataOffsets[0]);
 724     }
 725 
 726 //    /**
 727 //     * For debugging...  prints a region of a one-band IntegerComponentRaster
 728 //     */
 729 //    public void print(int x, int y, int w, int h) {
 730 //        // REMIND:  Only works for 1 band!
 731 //        System.out.println(this);
 732 //        int offset = dataOffsets[0] + y*scanlineStride + x*pixelStride;
 733 //        int off;
 734 //        for (int yoff=0; yoff < h; yoff++, offset += scanlineStride) {
 735 //            off = offset;
 736 //            System.out.print("Line "+(sampleModelTranslateY+y+yoff)+": ");
 737 //            for (int xoff = 0; xoff < w; xoff++, off+= pixelStride) {
 738 //                System.out.print(Integer.toHexString(data[off])+" ");
 739 //            }
 740 //            System.out.println("");
 741 //        }
 742 //    }
 743 
 744 }