Examples of java.awt.image.Raster.createChild()

java.awt.image.Raster.createChild()
Returns a new Raster which shares all or part of this Raster's DataBuffer. The new Raster will possess a reference to the current Raster, accessible through its getParent() method.
The parentX, parentY, width and height parameters form a Rectangle in this Raster's coordinate space, indicating the area of pixels to be shared. An error will be thrown if this Rectangle is not contained with the bounds of the current Raster.
The new Raster may additionally be translated to a different coordinate system for the plane than that used by the current Raster. The childMinX and childMinY parameters give the new (x, y) coordinate of the upper-left pixel of the returned Raster; the coordinate (childMinX, childMinY) in the new Raster will map to the same pixel as the coordinate (parentX, parentY) in the current Raster.
The new Raster may be defined to contain only a subset of the bands of the current Raster, possibly reordered, by means of the bandList parameter. If bandList is null, it is taken to include all of the bands of the current Raster in their current order.
To create a new Raster that contains a subregion of the current Raster, but shares its coordinate system and bands, this method should be called with childMinX equal to parentX, childMinY equal to parentY, and bandList equal to null. @param parentX The X coordinate of the upper-left corner in this Raster's coordinates @param parentY The Y coordinate of the upper-left corner in this Raster's coordinates @param width Width of the region starting at (parentX, parentY) @param height Height of the region starting at (parentX, parentY). @param childMinX The X coordinate of the upper-left corner of the returned Raster @param childMinY The Y coordinate of the upper-left corner of the returned Raster @param bandList Array of band indices, or null to use all bands @return a new Raster. @exception RasterFormatException if the specified subregion is outsideof the raster bounds. @throws RasterFormatException if width orheight is less than or equal to zero, or computing any of parentX + width, parentY + height, childMinX + width, or childMinY + height results in integer overflow

            int numBands = ras.getNumBands() - 1;
            int[] bandList = new int[numBands];
            for (int i = 0; i < numBands; i++) {
                bandList[i] = i;
            }
            ras = ras.createChild(0, 0,
                                  ras.getWidth(), ras.getHeight(),
                                  0, 0,
                                  bandList);
        }

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    int endY = YToTileY(bounds.y + bounds.height - 1);
    Raster tile;


    if ((startX == endX) && (startY == endY)) {
      tile = getTile(startX, startY);
      return tile.createChild(bounds.x, bounds.y,
                  bounds.width, bounds.height,
                  bounds.x, bounds.y, null);
    } else {
      // Create a WritableRaster of the desired size
      SampleModel sm =

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            srcx -= dstx;
            srcy -= dsty;
            while (si.nextSpan(span)) {
                int w = span[2] - span[0];
                int h = span[3] - span[1];
                srcRas = srcRas.createChild(srcx + span[0], srcy + span[1],
                                            w, h, 0, 0, null);
                dstRas = dstRas.createWritableChild(span[0], span[1],
                                                    w, h, 0, 0, null);
                ctx.compose(srcRas, dstRas, dstRas);
            }

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    // //
    if (src.getNumXTiles() == 1 && src.getNumYTiles() == 1) {
      final int minTileX = src.getMinTileX();
      final int minTileY = src.getMinTileY();
      final Raster sourceR = src.getTile(minTileX, minTileY);
      rasterOp.filter(sourceR.createChild(src.getMinX(), src.getMinY(),
          src.getWidth(), src.getHeight(), 0, 0, null), destWr);
      return dest;
    }


    // //

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            if (noTransform) {
                Raster ras = src.getTile(tileX, tileY);
                if (noSubband)
                    return ras;
                else {
                    return ras.createChild(sx, sy, tileWidth, tileHeight,
                                           sx, sy, sourceBands);
                }
            }


            WritableRaster ras = Raster.createWritableRaster(sm, new Point(sx, sy));

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            raster = im.getTile(im.getMinTileX(), im.getMinTileY());


            // Ensure result has requested coverage.
            Rectangle bounds = raster.getBounds();
            if (!bounds.equals(region)) {
                raster = raster.createChild(region.x, region.y,
                                            region.width, region.height,
                                            region.x, region.y,
                                            null);
            }
        } else {

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            int numBands = ras.getNumBands() - 1;
            int[] bandList = new int[numBands];
            for (int i = 0; i < numBands; i++) {
                bandList[i] = i;
            }
            ras = ras.createChild(0, 0,
                                  ras.getWidth(), ras.getHeight(),
                                  0, 0,
                                  bandList);
        }

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        int endY = YToTileY(bounds.y + bounds.height - 1);
        Raster tile;


        if ((startX == endX) && (startY == endY)) {
            tile = getTile(startX, startY);
            return tile.createChild(bounds.x, bounds.y,
                                    bounds.width, bounds.height,
                                    bounds.x, bounds.y, null);
        } else {
            // Create a WritableRaster of the desired size
            SampleModel sm =

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        int yt0 = getYTile(rect.y);
        int yt1 = getYTile(rect.y+rect.height-1);


        if ((xt0 == xt1) && (yt0 == yt1)) {
            Raster r = getTile(xt0, yt0);
            return r.createChild(rect.x, rect.y, rect.width, rect.height,
                                 rect.x, rect.y, null);
        }
        // rect crosses tile boundries...
        return super.getData(rect);
    }

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      int[] bandList = new int[numBands];
      for (int i = 0; i < numBands; i++)
      {
        bandList[i] = i;
      }
      ras = ras.createChild(0, 0, ras.getWidth(), ras.getHeight(), 0, 0,
          bandList);
    }


    if (interlace)
    {

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