/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.sanselan.formats.bmp.pixelparsers;
import java.io.IOException;
import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.formats.bmp.BmpHeaderInfo;
import com.google.code.appengine.awt.image.BufferedImage;
import com.google.code.appengine.awt.image.DataBuffer;
public class PixelParserRle extends PixelParser
{
public PixelParserRle(BmpHeaderInfo bhi, byte ColorTable[],
byte ImageData[])
{
super(bhi, ColorTable, ImageData);
}
private int getSamplesPerByte() throws ImageReadException, IOException
{
if (bhi.bitsPerPixel == 8)
return 1;
else if (bhi.bitsPerPixel == 4)
return 2;
else
throw new ImageReadException("BMP RLE: bad BitsPerPixel: "
+ bhi.bitsPerPixel);
}
private int[] convertDataToSamples(int data) throws ImageReadException,
IOException
{
int rgbs[];
if (bhi.bitsPerPixel == 8)
{
rgbs = new int[1];
rgbs[0] = getColorTableRGB(data);
// pixels_written = 1;
}
else if (bhi.bitsPerPixel == 4)
{
rgbs = new int[2];
int sample1 = data >> 4;
int sample2 = 0x0f & data;
rgbs[0] = getColorTableRGB(sample1);
rgbs[1] = getColorTableRGB(sample2);
// pixels_written = 2;
}
else
throw new ImageReadException("BMP RLE: bad BitsPerPixel: "
+ bhi.bitsPerPixel);
return rgbs;
}
private int processByteOfData(int rgbs[], int repeat, int x, int y,
int width, int height, DataBuffer db, BufferedImage bi)
throws ImageReadException
{
// int rbg
int pixels_written = 0;
for (int i = 0; i < repeat; i++)
{
if ((x >= 0) && (x < width) && (y >= 0) && (y < height))
{
// int rgb = 0xff000000;
// rgb = getNextRGB();
int rgb = rgbs[i % rgbs.length];
// bi.setRGB(x, y, rgb);
db.setElem(y * bhi.width + x, rgb);
// bi.setRGB(x, y, 0xff00ff00);
}
else
{
System.out.println("skipping bad pixel (" + x + "," + y + ")");
}
x++;
pixels_written++;
}
return pixels_written;
}
public void processImage(BufferedImage bi) throws ImageReadException,
IOException
{
DataBuffer db = bi.getRaster().getDataBuffer();
int count = 0;
int width = bhi.width;
int height = bhi.height;
int x = 0, y = height - 1;
// bfp.setDebug(true);
boolean done = false;
while (!done)
{
count++;
// if (count > 100)
// return;
int a = 0xff & bfp.readByte("RLE (" + x + "," + y + ") a", is,
"BMP: Bad RLE");
// baos.write(a);
int b = 0xff & bfp.readByte("RLE (" + x + "," + y + ") b", is,
"BMP: Bad RLE");
// baos.write(b);
if (a == 0)
{
switch (b)
{
case 0 : // EOL
{
// System.out.println("EOL");
y--;
x = 0;
}
break;
case 1 : // EOF
// System.out
// .println("xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
done = true;
break;
case 2 : {
// System.out
// .println("xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
int c = 0xff & bfp
.readByte("RLE c", is, "BMP: Bad RLE");
// baos.write(c);
int d = 0xff & bfp
.readByte("RLE d", is, "BMP: Bad RLE");
// baos.write(d);
}
break;
default : {
// System.out
// .println("xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
int SamplesPerByte = getSamplesPerByte();
int size = b / SamplesPerByte;
if ((b % SamplesPerByte) > 0)
size++;
if ((size % 2) != 0)
size++;
// System.out.println("b: " + b);
// System.out.println("size: " + size);
// System.out.println("SamplesPerByte: " + SamplesPerByte);
byte bytes[] = bfp.readByteArray("bytes", size, is,
"RLE: Absolute Mode");
int remaining = b;
// while(true)
for (int i = 0; remaining > 0; i++)
// for (int i = 0; i < bytes.length; i++)
{
int samples[] = convertDataToSamples(0xff & bytes[i]);
int towrite = Math.min(remaining, SamplesPerByte);
// System.out.println("remaining: " + remaining);
// System.out.println("SamplesPerByte: "
// + SamplesPerByte);
// System.out.println("towrite: " + towrite);
int written = processByteOfData(samples, towrite,
x, y, width, height, db, bi);
// System.out.println("written: " + written);
// System.out.println("");
x += written;
remaining -= written;
}
// baos.write(bytes);
}
break;
}
}
else
{
int rgbs[] = convertDataToSamples(b);
x += processByteOfData(rgbs, a, x, y, width, height, db, bi);
// x += processByteOfData(b, a, x, y, width, height, bi);
}
}
}
}