writableraster.java

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     * primitive array of type TransferType.  For image data supported by
     * the Java 2D(tm) API, this will be one of DataBuffer.TYPE_BYTE,
     * DataBuffer.TYPE_USHORT, DataBuffer.TYPE_INT, DataBuffer.TYPE_SHORT,
     * DataBuffer.TYPE_FLOAT, or DataBuffer.TYPE_DOUBLE.  Data in the array
     * may be in a packed format, thus increasing efficiency for data
     * transfers.
     * An ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds, or if inData is not large enough to hold the pixel data.
     * However, explicit bounds checking is not guaranteed.
     * A ClassCastException will be thrown if the input object is not null
     * and references anything other than an array of TransferType.
     * @see java.awt.image.SampleModel#setDataElements(int, int, Object, DataBuffer)
     * @param x        The X coordinate of the pixel location.
     * @param y        The Y coordinate of the pixel location.
     * @param inData   An object reference to an array of type defined by
     *                 getTransferType() and length getNumDataElements()
     *                 containing the pixel data to place at x,y.
     *
     * @throws ArrayIndexOutOfBoundsException if the coordinates are not
     * in bounds, or if inData is too small to hold the input.
     */
    public void setDataElements(int x, int y, Object inData) {
        sampleModel.setDataElements(x-sampleModelTranslateX,
                                    y-sampleModelTranslateY,
                                    inData, dataBuffer);
    }

    /**
     * Sets the data for a rectangle of pixels from an input Raster.
     * The input Raster must be compatible with this WritableRaster
     * in that they must have the same number of bands, corresponding bands
     * must have the same number of bits per sample, the TransferTypes
     * and NumDataElements must be the same, and the packing used by
     * the getDataElements/setDataElements must be identical.
     * An ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * However, explicit bounds checking is not guaranteed.
     * @param x        The X coordinate of the pixel location.
     * @param y        The Y coordinate of the pixel location.
     * @param inRaster Raster containing data to place at x,y.
     *
     * @throws NullPointerException if inRaster is null.
     * @throws ArrayIndexOutOfBoundsException if the coordinates are not
     * in bounds.
     */
    public void setDataElements(int x, int y, Raster inRaster) {
        int dstOffX = x+inRaster.getMinX();
        int dstOffY = y+inRaster.getMinY();
        int width  = inRaster.getWidth();
        int height = inRaster.getHeight();
        if ((dstOffX < this.minX) || (dstOffY < this.minY) ||
            (dstOffX + width > this.minX + this.width) ||
            (dstOffY + height > this.minY + this.height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }

        int srcOffX = inRaster.getMinX();
        int srcOffY = inRaster.getMinY();
        Object tdata = null;

        for (int startY=0; startY < height; startY++) {
            tdata = inRaster.getDataElements(srcOffX, srcOffY+startY,
                                             width, 1, tdata);
            setDataElements(dstOffX, dstOffY+startY,
                            width, 1, tdata);
        }
    }

    /**
     * Sets the data for a rectangle of pixels from a
     * primitive array of type TransferType.  For image data supported by
     * the Java 2D API, this will be one of DataBuffer.TYPE_BYTE,
     * DataBuffer.TYPE_USHORT, DataBuffer.TYPE_INT, DataBuffer.TYPE_SHORT,
     * DataBuffer.TYPE_FLOAT, or DataBuffer.TYPE_DOUBLE.  Data in the array
     * may be in a packed format, thus increasing efficiency for data
     * transfers.
     * An ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds, or if inData is not large enough to hold the pixel data.
     * However, explicit bounds checking is not guaranteed.
     * A ClassCastException will be thrown if the input object is not null
     * and references anything other than an array of TransferType.
     * @see java.awt.image.SampleModel#setDataElements(int, int, int, int, Object, DataBuffer)
     * @param x        The X coordinate of the upper left pixel location.
     * @param y        The Y coordinate of the upper left pixel location.
     * @param w        Width of the pixel rectangle.
     * @param h        Height of the pixel rectangle.
     * @param inData   An object reference to an array of type defined by
     *                 getTransferType() and length w*h*getNumDataElements()
     *                 containing the pixel data to place between x,y and
     *                 x+w-1, y+h-1.
     *
     * @throws NullPointerException if inData is null.
     * @throws ArrayIndexOutOfBoundsException if the coordinates are not
     * in bounds, or if inData is too small to hold the input.
     */
    public void setDataElements(int x, int y, int w, int h, Object inData) {
        sampleModel.setDataElements(x-sampleModelTranslateX,
                                    y-sampleModelTranslateY,
                                    w,h,inData,dataBuffer);
    }

    /**
     * Copies pixels from Raster srcRaster to this WritableRaster.  Each pixel
     * in srcRaster is copied to the same x,y address in this raster, unless 
     * the address falls outside the bounds of this raster.  srcRaster
     * must have the same number of bands as this WritableRaster.  The
     * copy is a simple copy of source samples to the corresponding destination
     * samples.
     * <p>
     * If all samples of both source and destination Rasters are of
     * integral type and less than or equal to 32 bits in size, then calling
     * this method is equivalent to executing the following code for all
     * <code>x,y</code> addresses valid in both Rasters.
     * <pre>
     *       Raster srcRaster;
     *       WritableRaster dstRaster;
     *       for (int b = 0; b < srcRaster.getNumBands(); b++) {
     *           dstRaster.setSample(x, y, b, srcRaster.getSample(x, y, b));
     *       }
     * </pre>
     * Thus, when copying an integral type source to an integral type
     * destination, if the source sample size is greater than the destination
     * sample size for a particular band, the high order bits of the source
     * sample are truncated.  If the source sample size is less than the
     * destination size for a particular band, the high order bits of the
     * destination are zero-extended or sign-extended depending on whether
     * srcRaster's SampleModel treats the sample as a signed or unsigned
     * quantity.
     * <p>
     * When copying a float or double source to an integral type destination,
     * each source sample is cast to the destination type.  When copying an
     * integral type source to a float or double destination, the source
     * is first converted to a 32-bit int (if necessary), using the above
     * rules for integral types, and then the int is cast to float or
     * double.
     * <p>
     * @param srcRaster  The  Raster from which to copy pixels.
     *
     * @throws NullPointerException if srcRaster is null.
     */
    public void setRect(Raster srcRaster) {
        setRect(0,0,srcRaster);
    }

    /**
     * Copies pixels from Raster srcRaster to this WritableRaster.
     * For each (x, y) address in srcRaster, the corresponding pixel
     * is copied to address (x+dx, y+dy) in this WritableRaster,
     * unless (x+dx, y+dy) falls outside the bounds of this raster.
     * srcRaster must have the same number of bands as this WritableRaster.
     * The copy is a simple copy of source samples to the corresponding
     * destination samples.  For details, see
     * {@link WritableRaster#setRect(Raster)}.
     *
     * @param dx        The X translation factor from src space to dst space
     *                  of the copy.
     * @param dy        The Y translation factor from src space to dst space
     *                  of the copy.
     * @param srcRaster The Raster from which to copy pixels.
     *
     * @throws NullPointerException if srcRaster is null.
     */
    public void setRect(int dx, int dy, Raster srcRaster) {
        int width  = srcRaster.getWidth();
        int height = srcRaster.getHeight();
        int srcOffX = srcRaster.getMinX();
        int srcOffY = srcRaster.getMinY();
        int dstOffX = dx+srcOffX;
        int dstOffY = dy+srcOffY;

        // Clip to this raster
        if (dstOffX < this.minX) {
            int skipX = this.minX - dstOffX;
            width -= skipX;
            srcOffX += skipX;
            dstOffX = this.minX;
        }
        if (dstOffY < this.minY) {
            int skipY = this.minY - dstOffY;
            height -= skipY;
            srcOffY += skipY;
            dstOffY = this.minY;
        }
        if (dstOffX+width > this.minX+this.width) {
            width = this.minX + this.width - dstOffX;
        }
        if (dstOffY+height > this.minY+this.height) {
            height = this.minY + this.height - dstOffY;
        }

        if (width <= 0 || height <= 0) {
            return;
        }

        switch (srcRaster.getSampleModel().getDataType()) {
        case DataBuffer.TYPE_BYTE:
        case DataBuffer.TYPE_SHORT:
        case DataBuffer.TYPE_USHORT:
        case DataBuffer.TYPE_INT:
            int[] iData = null;    
            for (int startY=0; startY < height; startY++) {
                // Grab one scanline at a time
                iData =
                    srcRaster.getPixels(srcOffX, srcOffY+startY, width, 1,
                                        iData);
                setPixels(dstOffX, dstOffY+startY, width, 1, iData);
            }
            break;

        case DataBuffer.TYPE_FLOAT:
            float[] fData = null;    
            for (int startY=0; startY < height; startY++) {
                fData =
                    srcRaster.getPixels(srcOffX, srcOffY+startY, width, 1,
                                        fData);
                setPixels(dstOffX, dstOffY+startY, width, 1, fData);
            }
            break;

        case DataBuffer.TYPE_DOUBLE:
            double[] dData = null;    
            for (int startY=0; startY < height; startY++) {
                // Grab one scanline at a time
                dData =
                    srcRaster.getPixels(srcOffX, srcOffY+startY, width, 1,
                                        dData);
                setPixels(dstOffX, dstOffY+startY, width, 1, dData);
            }
            break;
        }
    }

    /** 
     * Sets a pixel in the DataBuffer using an int array of samples for input.
     * An ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * However, explicit bounds checking is not guaranteed.
     * @param x      The X coordinate of the pixel location.
     * @param y      The Y coordinate of the pixel location.
     * @param iArray The input samples in a int array.
     *