| /* Copyright (C) 2004 Free Software Foundation |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package java.awt.image; |
| |
| import gnu.java.awt.Buffers; |
| |
| /** |
| * MultiPixelPackedSampleModel provides a single band model that supports |
| * multiple pixels in a single unit. Pixels have 2^n bits and 2^k pixels fit |
| * per data element. |
| * |
| * @author Jerry Quinn (jlquinn@optonline.net) |
| */ |
| public class MultiPixelPackedSampleModel extends SampleModel |
| { |
| private int scanlineStride; |
| private int[] bitMasks; |
| private int[] bitOffsets; |
| private int[] sampleSize; |
| private int dataBitOffset; |
| private int elemBits; |
| private int numberOfBits; |
| private int numElems; |
| |
| public MultiPixelPackedSampleModel(int dataType, int w, int h, |
| int numberOfBits) |
| { |
| this(dataType, w, h, numberOfBits, 0, 0); |
| } |
| |
| public MultiPixelPackedSampleModel(int dataType, int w, int h, |
| int numberOfBits, int scanlineStride, |
| int dataBitOffset) |
| { |
| super(dataType, w, h, 1); |
| |
| switch (dataType) |
| { |
| case DataBuffer.TYPE_BYTE: |
| elemBits = 8; |
| break; |
| case DataBuffer.TYPE_USHORT: |
| elemBits = 16; |
| break; |
| case DataBuffer.TYPE_INT: |
| elemBits = 32; |
| break; |
| default: |
| throw new IllegalArgumentException("MultiPixelPackedSampleModel" |
| + " unsupported dataType"); |
| } |
| |
| this.dataBitOffset = dataBitOffset; |
| |
| this.numberOfBits = numberOfBits; |
| if (numberOfBits > elemBits) |
| throw new RasterFormatException("MultiPixelPackedSampleModel pixel size" |
| + " larger than dataType"); |
| switch (numberOfBits) |
| { |
| case 1: case 2: case 4: case 8: case 16: case 32: break; |
| default: |
| throw new RasterFormatException("MultiPixelPackedSampleModel pixel" |
| + " size not 2^n bits"); |
| } |
| numElems = elemBits / numberOfBits; |
| |
| // Compute scan line large enough for w pixels. |
| if (scanlineStride == 0) |
| scanlineStride = ((dataBitOffset + w * numberOfBits) / elemBits); |
| this.scanlineStride = scanlineStride; |
| |
| |
| sampleSize = new int[1]; |
| sampleSize[0] = numberOfBits; |
| |
| bitMasks = new int[numElems]; |
| bitOffsets = new int[numElems]; |
| for (int i=0; i < numElems; i++) |
| { |
| bitOffsets[numElems - i- 1] = numberOfBits * i; |
| bitMasks[numElems - i - 1] = ((1 << numberOfBits) - 1) << |
| bitOffsets[numElems - i - 1]; |
| } |
| } |
| |
| public SampleModel createCompatibleSampleModel(int w, int h) |
| { |
| /* FIXME: We can avoid recalculation of bit offsets and sample |
| sizes here by passing these from the current instance to a |
| special private constructor. */ |
| return new MultiPixelPackedSampleModel(dataType, w, h, numberOfBits); |
| } |
| |
| |
| /** |
| * Creates a DataBuffer for holding pixel data in the format and |
| * layout described by this SampleModel. The returned buffer will |
| * consist of one single bank. |
| */ |
| public DataBuffer createDataBuffer() |
| { |
| int size; |
| |
| // FIXME: The comment refers to SinglePixelPackedSampleModel. See if the |
| // same can be done for MultiPixelPackedSampleModel. |
| // We can save (scanlineStride - width) pixels at the very end of |
| // the buffer. The Sun reference implementation (J2SE 1.3.1 and |
| // 1.4.1_01) seems to do this; tested with Mauve test code. |
| size = scanlineStride * height; |
| |
| return Buffers.createBuffer(getDataType(), size); |
| } |
| |
| |
| public int getNumDataElements() |
| { |
| return 1; |
| } |
| |
| public int[] getSampleSize() |
| { |
| return sampleSize; |
| } |
| |
| public int getSampleSize(int band) |
| { |
| return sampleSize[0]; |
| } |
| |
| public int getOffset(int x, int y) |
| { |
| return scanlineStride * y + ((dataBitOffset + x*numberOfBits) / elemBits); |
| } |
| |
| public int getBitOffset(int x) |
| { |
| return (dataBitOffset + x*numberOfBits) % elemBits; |
| } |
| |
| public int getDataBitOffset() |
| { |
| return dataBitOffset; |
| } |
| |
| public int getScanlineStride() |
| { |
| return scanlineStride; |
| } |
| |
| public int getPixelBitStride() |
| { |
| return numberOfBits; |
| } |
| |
| |
| public SampleModel createSubsetSampleModel(int[] bands) |
| { |
| int numBands = bands.length; |
| if (numBands != 1) |
| throw new RasterFormatException("MultiPixelPackedSampleModel only" |
| + " supports one band"); |
| |
| return new MultiPixelPackedSampleModel(dataType, width, height, |
| numberOfBits, scanlineStride, |
| dataBitOffset); |
| } |
| |
| /** |
| * Extract one pixel and return in an array of transfer type. |
| * |
| * Extracts the pixel at x, y from data and stores into the 0th index of the |
| * array obj, since there is only one band. If obj is null, a new array of |
| * getTransferType() is created. |
| * |
| * @param x The x-coordinate of the pixel rectangle to store in <code>obj</code>. |
| * @param y The y-coordinate of the pixel rectangle to store in <code>obj</code>. |
| * @param obj The primitive array to store the pixels into or null to force creation. |
| * @param data The DataBuffer that is the source of the pixel data. |
| * @return The primitive array containing the pixel data. |
| * @see java.awt.image.SampleModel#getDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer) |
| */ |
| public Object getDataElements(int x, int y, Object obj, |
| DataBuffer data) |
| { |
| int pixel = getSample(x, y, 0, data); |
| switch (getTransferType()) |
| { |
| case DataBuffer.TYPE_BYTE: |
| if (obj == null) obj = new byte[1]; |
| ((byte[])obj)[0] = (byte)pixel; |
| return obj; |
| case DataBuffer.TYPE_USHORT: |
| if (obj == null) obj = new short[1]; |
| ((short[])obj)[0] = (short)pixel; |
| return obj; |
| case DataBuffer.TYPE_INT: |
| if (obj == null) obj = new int[1]; |
| ((int[])obj)[0] = pixel; |
| return obj; |
| default: |
| // Seems like the only sensible thing to do. |
| throw new ClassCastException(); |
| } |
| } |
| |
| public int[] getPixel(int x, int y, int[] iArray, DataBuffer data) |
| { |
| if (iArray == null) iArray = new int[1]; |
| iArray[0] = getSample(x, y, 0, data); |
| |
| return iArray; |
| } |
| |
| public int[] getPixels(int x, int y, int w, int h, int[] iArray, |
| DataBuffer data) |
| { |
| int offset = getOffset(x, y); |
| if (iArray == null) iArray = new int[w*h]; |
| int outOffset = 0; |
| for (y=0; y<h; y++) |
| { |
| int lineOffset = offset; |
| for (x=0; x<w;) |
| { |
| int samples = data.getElem(lineOffset++); |
| for (int b=0; b<numElems && x<w; b++) |
| { |
| iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b]; |
| x++; |
| } |
| } |
| offset += scanlineStride; |
| } |
| return iArray; |
| } |
| |
| public int getSample(int x, int y, int b, DataBuffer data) |
| { |
| int pos = |
| ((dataBitOffset + x * numberOfBits) % elemBits) / numberOfBits; |
| int offset = getOffset(x, y); |
| int samples = data.getElem(offset); |
| return (samples & bitMasks[pos]) >>> bitOffsets[pos]; |
| } |
| |
| /** |
| * Set the pixel at x, y to the value in the first element of the primitive |
| * array obj. |
| * |
| * @param x The x-coordinate of the data elements in <code>obj</code>. |
| * @param y The y-coordinate of the data elements in <code>obj</code>. |
| * @param obj The primitive array containing the data elements to set. |
| * @param data The DataBuffer to store the data elements into. |
| * @see java.awt.image.SampleModel#setDataElements(int, int, int, int, java.lang.Object, java.awt.image.DataBuffer) |
| */ |
| public void setDataElements(int x, int y, Object obj, DataBuffer data) |
| { |
| int transferType = getTransferType(); |
| if (getTransferType() != data.getDataType()) |
| { |
| throw new IllegalArgumentException("transfer type ("+ |
| getTransferType()+"), "+ |
| "does not match data "+ |
| "buffer type (" + |
| data.getDataType() + |
| ")."); |
| } |
| |
| int offset = getOffset(x, y); |
| |
| try |
| { |
| switch (transferType) |
| { |
| case DataBuffer.TYPE_BYTE: |
| { |
| DataBufferByte out = (DataBufferByte) data; |
| byte[] in = (byte[]) obj; |
| out.getData()[offset] = in[0]; |
| return; |
| } |
| case DataBuffer.TYPE_USHORT: |
| { |
| DataBufferUShort out = (DataBufferUShort) data; |
| short[] in = (short[]) obj; |
| out.getData()[offset] = in[0]; |
| return; |
| } |
| case DataBuffer.TYPE_INT: |
| { |
| DataBufferInt out = (DataBufferInt) data; |
| int[] in = (int[]) obj; |
| out.getData()[offset] = in[0]; |
| return; |
| } |
| default: |
| throw new ClassCastException("Unsupported data type"); |
| } |
| } |
| catch (ArrayIndexOutOfBoundsException aioobe) |
| { |
| String msg = "While writing data elements" + |
| ", x="+x+", y="+y+ |
| ", width="+width+", height="+height+ |
| ", scanlineStride="+scanlineStride+ |
| ", offset="+offset+ |
| ", data.getSize()="+data.getSize()+ |
| ", data.getOffset()="+data.getOffset()+ |
| ": " + |
| aioobe; |
| throw new ArrayIndexOutOfBoundsException(msg); |
| } |
| } |
| |
| public void setPixel(int x, int y, int[] iArray, DataBuffer data) |
| { |
| setSample(x, y, 0, iArray[0], data); |
| } |
| |
| public void setSample(int x, int y, int b, int s, DataBuffer data) |
| { |
| int bitpos = |
| ((dataBitOffset + x * numberOfBits) % elemBits) / numberOfBits; |
| int offset = getOffset(x, y); |
| |
| s = s << bitOffsets[bitpos]; |
| s = s & bitMasks[bitpos]; |
| |
| int sample = data.getElem(offset); |
| sample |= s; |
| data.setElem(offset, sample); |
| } |
| |
| /** |
| * Creates a String with some information about this SampleModel. |
| * @return A String describing this SampleModel. |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() |
| { |
| StringBuffer result = new StringBuffer(); |
| result.append(getClass().getName()); |
| result.append("["); |
| result.append("scanlineStride=").append(scanlineStride); |
| for(int i=0; i < bitMasks.length; i+=1) |
| { |
| result.append(", mask[").append(i).append("]=0x").append(Integer.toHexString(bitMasks[i])); |
| } |
| |
| result.append("]"); |
| return result.toString(); |
| } |
| } |