+++ /dev/null
-/* $RCSfile$
- * $Author: nicove $
- * $Date: 2007-03-30 12:26:16 -0500 (Fri, 30 Mar 2007) $
- * $Revision: 7275 $
- *
- * Some portions of this file have been modified by Robert Hanson hansonr.at.stolaf.edu 2012-2017
- * for use in SwingJS via transpilation into JavaScript using Java2Script.
- *
- * Copyright (C) 2002-2005 The Jmol Development Team
- *
- * Contact: jmol-developers@lists.sf.net
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-package javajs.img;
-
-import java.io.BufferedInputStream;
-import java.io.IOException;
-
-import javajs.util.Rdr;
-
-/**
- * src: http://www.javaworld.com/article/2077542/learn-java/java-tip-43--how-to-
- * read-8--and-24-bit-microsoft-windows-bitmaps-in-java-applications.html
- *
- * see also: http://en.wikipedia.org/wiki/BMP_file_format
- *
- * Modified by Bob Hanson hansonr@stolaf.edu
- *
- * @author Bob Hanson (hansonr@stolaf.edu)
- *
- */
-public class BMPDecoder {
-
- public BMPDecoder() {
- // for reflection
- }
-
- private BufferedInputStream bis;
-
- /**
- * original comment:
- *
- * loadbitmap() method converted from Windows C code. Reads only uncompressed
- * 24- and 8-bit images. Tested with images saved using Microsoft Paint in
- * Windows 95. If the image is not a 24- or 8-bit image, the program refuses
- * to even try. I guess one could include 4-bit images by masking the byte by
- * first 1100 and then 0011. I am not really interested in such images. If a
- * compressed image is attempted, the routine will probably fail by generating
- * an IOException. Look for variable ncompression to be different from 0 to
- * indicate compression is present.
- *
- * @param bytes
- * @return [image byte array, width, height]
- */
- public Object[] decodeWindowsBMP(byte[] bytes) {
- try {
- bis = Rdr.getBIS(bytes);
- temp = new byte[4];
- // read BITMAPFILEHEADER
- if (readByte() != 'B' || readByte() != 'M')
- return null;
- readInt(); // file size; ignored
- readShort(); // reserved
- readShort(); // reserved
- readInt(); // ptr to pixel array; ignored
- int imageWidth, imageHeight, bitsPerPixel, nColors = 0, imageSize = 0;
- // read BITMAP header
- int headerSize = readInt();
- switch (headerSize) {
- case 12:
- // BITMAPCOREHEADER
- imageWidth = readShort();
- imageHeight = readShort();
- readShort(); // planes
- bitsPerPixel = readShort();
- break;
- case 40:
- // BITMAPINFOHEADER
- imageWidth = readInt();
- imageHeight = readInt();
- readShort(); // planes
- bitsPerPixel = readShort();
- int ncompression = readInt();
- if (ncompression != 0) {
- System.out.println("BMP Compression is :" + ncompression
- + " -- aborting");
- return null;
- }
- imageSize = readInt();
- readInt(); // hres
- readInt(); // vres
- nColors = readInt();
- readInt(); // colors used
- break;
- default:
- System.out.println("BMP Header unrecognized, length=" + headerSize
- + " -- aborting");
- return null;
- }
- boolean isYReversed = (imageHeight < 0);
- if (isYReversed)
- imageHeight = -imageHeight;
- int nPixels = imageHeight * imageWidth;
- int bytesPerPixel = bitsPerPixel / 8;
- nColors = (nColors > 0 ? nColors : 1 << bitsPerPixel);
- int npad = (bytesPerPixel == 4 ? 0
- : imageSize == 0 ? 4 - (imageWidth % 4) : (imageSize / imageHeight)
- - imageWidth * bytesPerPixel) % 4;
- int[] palette;
- int[] buf = new int[nPixels];
- int dpt = (isYReversed ? imageWidth : -imageWidth);
- int pt0 = (isYReversed ? 0 : nPixels + dpt);
- int pt1 = (isYReversed ? nPixels : dpt);
- switch (bitsPerPixel) {
- case 32:
- case 24:
- for (int pt = pt0; pt != pt1; pt += dpt, pad(npad))
- for (int i = 0; i < imageWidth; i++)
- buf[pt + i] = readColor(bytesPerPixel);
- break;
- case 8:
- palette = new int[nColors];
- for (int i = 0; i < nColors; i++)
- palette[i] = readColor(4);
- for (int pt = pt0; pt != pt1; pt += dpt, pad(npad))
- for (int i = 0; i < imageWidth; i++)
- buf[pt + i] = palette[readByte()];
- break;
- case 4:
- npad = (4 - (((imageWidth + 1) / 2) % 4)) % 4;
- palette = new int[nColors];
- for (int i = 0; i < nColors; i++)
- palette[i] = readColor(4);
- int b4 = 0;
- for (int pt = pt0; pt != pt1; pt += dpt, pad(npad))
- for (int i = 0, shift = 4; i < imageWidth; i++, shift = 4 - shift)
- buf[pt + i] = palette[((shift == 4 ? (b4 = readByte()) : b4) >> shift) & 0xF];
- break;
- case 1:
- int color1 = readColor(3);
- int color2 = readColor(3);
- npad = (4 - (((imageWidth + 7) / 8) % 4)) % 4;
- int b = 0;
- for (int pt = pt0; pt != pt1; pt += dpt, pad(npad))
- for (int i = 0, bpt = -1; i < imageWidth; i++, bpt--) {
- if (bpt < 0) {
- b = readByte();
- bpt = 7;
- }
- buf[pt + i] = ((b & (1 << bpt)) == 0 ? color1 : color2);
- }
- break;
- case 64:
- case 2:
- default:
- System.out
- .println("Not a 32-, 24-, 8-, 4-, or 1-bit Windows Bitmap, aborting...");
- return null;
- }
- return new Object[] { buf, Integer.valueOf(imageWidth),
- Integer.valueOf(imageHeight) };
- } catch (Exception e) {
- System.out.println("Caught exception in loadbitmap!");
- }
- return null;
- }
-
- private boolean pad(int npad) throws IOException {
- for (int i = 0; i < npad; i++)
- readByte();
- return true;
- }
-
- private byte[] temp;
-
- private int readColor(int n) throws IOException {
- bis.read(temp, 0, n);
- return 0xff << 24 | ((temp[2] & 0xff) << 16)
- | ((temp[1] & 0xff) << 8) | temp[0] & 0xff;
- }
-
- private int readInt() throws IOException {
- bis.read(temp, 0, 4);
- return ((temp[3] & 0xff) << 24) | ((temp[2] & 0xff) << 16)
- | ((temp[1] & 0xff) << 8) | temp[0] & 0xff;
- }
-
- private int readShort() throws IOException {
- bis.read(temp, 0, 2);
- return ((temp[1] & 0xff) << 8) | temp[0] & 0xff;
- }
-
- private int readByte() throws IOException {
- bis.read(temp, 0, 1);
- return temp[0] & 0xff;
- }
-
-}
git://source.jalview.org / jalview.git / blobdiff