| /* |
| * 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.commons.sanselan.formats.bmp.writers; |
| |
| import java.awt.image.BufferedImage; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.commons.sanselan.common.BinaryOutputStream; |
| import org.apache.commons.sanselan.palette.SimplePalette; |
| |
| public class BmpWriterPalette extends BmpWriter |
| { |
| private final SimplePalette palette; |
| private final int bitsPerSample; |
| |
| public BmpWriterPalette(SimplePalette palette) |
| { |
| this.palette = palette; |
| |
| if (palette.length() <= 2) |
| bitsPerSample = 1; |
| else if (palette.length() <= 16) |
| bitsPerSample = 4; |
| else |
| bitsPerSample = 8; |
| } |
| |
| @Override |
| public int getPaletteSize() |
| { |
| return palette.length(); |
| } |
| |
| @Override |
| public int getBitsPerPixel() |
| { |
| return bitsPerSample; |
| } |
| |
| @Override |
| public void writePalette(BinaryOutputStream bos) throws IOException |
| { |
| for (int i = 0; i < palette.length(); i++) |
| { |
| int rgb = palette.getEntry(i); |
| |
| int red = 0xff & (rgb >> 16); |
| int green = 0xff & (rgb >> 8); |
| int blue = 0xff & (rgb >> 0); |
| |
| bos.write(blue); |
| bos.write(green); |
| bos.write(red); |
| bos.write(0); |
| } |
| } |
| |
| @Override |
| public byte[] getImageData(BufferedImage src) |
| { |
| int width = src.getWidth(); |
| int height = src.getHeight(); |
| |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| |
| int bit_cache = 0; |
| int bits_in_cache = 0; |
| |
| int bytecount = 0; |
| for (int y = height - 1; y >= 0; y--) |
| { |
| for (int x = 0; x < width; x++) |
| { |
| int argb = src.getRGB(x, y); |
| int rgb = 0xffffff & argb; |
| |
| int index = palette.getPaletteIndex(rgb); |
| |
| if (bitsPerSample == 8) |
| { |
| baos.write(0xff & index); |
| bytecount++; |
| } else |
| // 4 or 1 |
| { |
| bit_cache = (bit_cache << bitsPerSample) | index; |
| bits_in_cache += bitsPerSample; |
| if (bits_in_cache >= 8) |
| { |
| baos.write(0xff & bit_cache); |
| bytecount++; |
| bit_cache = 0; |
| bits_in_cache = 0; |
| } |
| } |
| } |
| |
| if (bits_in_cache > 0) |
| { |
| bit_cache = (bit_cache << (8 - bits_in_cache)); |
| |
| baos.write(0xff & bit_cache); |
| bytecount++; |
| bit_cache = 0; |
| bits_in_cache = 0; |
| } |
| |
| while ((bytecount % 4) != 0) |
| { |
| baos.write(0); |
| bytecount++; |
| } |
| } |
| |
| return baos.toByteArray(); |
| } |
| } |