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-rw-r--r--src/demos/util/SGIImage.java335
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diff --git a/src/demos/util/SGIImage.java b/src/demos/util/SGIImage.java
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-/*
- * Portions copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
- */
-
-package demos.util;
-
-import java.io.*;
-import javax.media.opengl.*;
-import com.sun.opengl.utils.*;
-
-// Test harness
-import java.awt.image.*;
-import javax.swing.*;
-
-/** <p> Reads SGI RGB/RGBA images. </p>
-
- <p> Written from <a href =
- "http://astronomy.swin.edu.au/~pbourke/dataformats/sgirgb/">Paul
- Bourke's adaptation</a> of the <a href =
- "http://astronomy.swin.edu.au/~pbourke/dataformats/sgirgb/sgiversion.html">SGI
- specification</a>. </p>
-*/
-
-public class SGIImage {
- private Header header;
- private int format;
- private byte[] data;
- // Used for decoding RLE-compressed images
- private int[] rowStart;
- private int[] rowSize;
- private int rleEnd;
- private byte[] tmpData;
- private byte[] tmpRead;
-
- static class Header {
- short magic; // IRIS image file magic number
- // This should be decimal 474
- byte storage; // Storage format
- // 0 for uncompressed
- // 1 for RLE compression
- byte bpc; // Number of bytes per pixel channel
- // Legally 1 or 2
- short dimension; // Number of dimensions
- // Legally 1, 2, or 3
- // 1 means a single row, XSIZE long
- // 2 means a single 2D image
- // 3 means multiple 2D images
- short xsize; // X size in pixels
- short ysize; // Y size in pixels
- short zsize; // Number of channels
- // 1 indicates greyscale
- // 3 indicates RGB
- // 4 indicates RGB and Alpha
- int pixmin; // Minimum pixel value
- // This is the lowest pixel value in the image
- int pixmax; // Maximum pixel value
- // This is the highest pixel value in the image
- int dummy; // Ignored
- // Normally set to 0
- String imagename; // Image name; 80 bytes long
- // Must be null terminated, therefore at most 79 bytes
- int colormap; // Colormap ID
- // 0 - normal mode
- // 1 - dithered, 3 mits for red and green, 2 for blue, obsolete
- // 2 - index colour, obsolete
- // 3 - not an image but a colourmap
- // 404 bytes char DUMMY Ignored
- // Should be set to 0, makes the header 512 bytes.
-
- Header(DataInputStream in) throws IOException {
- magic = in.readShort();
- storage = in.readByte();
- bpc = in.readByte();
- dimension = in.readShort();
- xsize = in.readShort();
- ysize = in.readShort();
- zsize = in.readShort();
- pixmin = in.readInt();
- pixmax = in.readInt();
- dummy = in.readInt();
- byte[] tmpname = new byte[80];
- in.read(tmpname);
- int numChars = 0;
- while (tmpname[numChars++] != 0);
- imagename = new String(tmpname, 0, numChars);
- colormap = in.readInt();
- byte[] tmp = new byte[404];
- in.read(tmp);
- }
-
- public String toString() {
- return ("magic: " + magic +
- " storage: " + (int) storage +
- " bpc: " + (int) bpc +
- " dimension: " + dimension +
- " xsize: " + xsize +
- " ysize: " + ysize +
- " zsize: " + zsize +
- " pixmin: " + pixmin +
- " pixmax: " + pixmax +
- " imagename: " + imagename +
- " colormap: " + colormap);
- }
- }
-
- private SGIImage(Header header) {
- this.header = header;
- }
-
- /** Reads an SGI image from the specified file. */
- public static SGIImage read(String filename) throws IOException {
- return read(new FileInputStream(filename));
- }
-
- /** Reads an SGI image from the specified InputStream. */
- public static SGIImage read(InputStream in) throws IOException {
- DataInputStream dIn = new DataInputStream(new BufferedInputStream(in));
-
- Header header = new Header(dIn);
- SGIImage res = new SGIImage(header);
- res.decodeImage(dIn);
- return res;
- }
-
- /** Returns the width of the image. */
- public int getWidth() {
- return header.xsize;
- }
-
- /** Returns the height of the image. */
- public int getHeight() {
- return header.ysize;
- }
-
- /** Returns the OpenGL format for this texture; e.g. GL.GL_BGR or GL.GL_BGRA. */
- public int getFormat() {
- return format;
- }
-
- /** Returns the raw data for this texture in the correct
- (bottom-to-top) order for calls to glTexImage2D. */
- public byte[] getData() { return data; }
-
- public String toString() {
- return header.toString();
- }
-
- //----------------------------------------------------------------------
- // Internals only below this point
- //
-
- private void decodeImage(DataInputStream in) throws IOException {
- if (header.storage == 1) {
- // Read RLE compression data; row starts and sizes
- int x = header.ysize * header.zsize;
- rowStart = new int[x];
- rowSize = new int[x];
- rleEnd = 4 * 2 * x + 512;
- for (int i = 0; i < x; i++) {
- rowStart[i] = in.readInt();
- }
- for (int i = 0; i < x; i++) {
- rowSize[i] = in.readInt();
- }
- tmpRead = new byte[header.xsize * 256];
- }
- tmpData = readAll(in);
-
- int xsize = header.xsize;
- int ysize = header.ysize;
- int zsize = header.zsize;
- int lptr = 0;
-
- data = new byte[xsize * ysize * 4];
- byte[] rbuf = new byte[xsize];
- byte[] gbuf = new byte[xsize];
- byte[] bbuf = new byte[xsize];
- byte[] abuf = new byte[xsize];
- for (int y = 0; y < ysize; y++) {
- if (zsize >= 4) {
- getRow(rbuf, y, 0);
- getRow(gbuf, y, 1);
- getRow(bbuf, y, 2);
- getRow(abuf, y, 3);
- rgbatorgba(rbuf, gbuf, bbuf, abuf, data, lptr);
- } else if (zsize == 3) {
- getRow(rbuf, y, 0);
- getRow(gbuf, y, 1);
- getRow(bbuf, y, 2);
- rgbtorgba(rbuf, gbuf, bbuf, data, lptr);
- } else if (zsize == 2) {
- getRow(rbuf, y, 0);
- getRow(abuf, y, 1);
- latorgba(rbuf, abuf, data, lptr);
- } else {
- getRow(rbuf, y, 0);
- bwtorgba(rbuf, data, lptr);
- }
- lptr += 4 * xsize;
- }
- rowStart = null;
- rowSize = null;
- tmpData = null;
- tmpRead = null;
- format = GL.GL_BGRA;
- }
-
- private void getRow(byte[] buf, int y, int z) {
- if (header.storage == 1) {
- int offs = rowStart[y + z * header.ysize] - rleEnd;
- System.arraycopy(tmpData, offs, tmpRead, 0, rowSize[y + z * header.ysize]);
- int iPtr = 0;
- int oPtr = 0;
- for (;;) {
- byte pixel = tmpRead[iPtr++];
- int count = (int) (pixel & 0x7F);
- if (count == 0) {
- return;
- }
- if ((pixel & 0x80) != 0) {
- while ((count--) > 0) {
- buf[oPtr++] = tmpRead[iPtr++];
- }
- } else {
- pixel = tmpRead[iPtr++];
- while ((count--) > 0) {
- buf[oPtr++] = pixel;
- }
- }
- }
- } else {
- int offs = (y * header.xsize) + (z * header.xsize * header.ysize);
- System.arraycopy(tmpData, offs, buf, 0, header.xsize);
- }
- }
-
- private void bwtorgba(byte[] b, byte[] dest, int lptr) {
- for (int i = 0; i < b.length; i++) {
- dest[4 * i + lptr + 0] = b[i];
- dest[4 * i + lptr + 1] = b[i];
- dest[4 * i + lptr + 2] = b[i];
- dest[4 * i + lptr + 3] = (byte) 0xFF;
- }
- }
-
- private void latorgba(byte[] b, byte[] a, byte[] dest, int lptr) {
- for (int i = 0; i < b.length; i++) {
- dest[4 * i + lptr + 0] = b[i];
- dest[4 * i + lptr + 1] = b[i];
- dest[4 * i + lptr + 2] = b[i];
- dest[4 * i + lptr + 3] = a[i];
- }
- }
-
- private void rgbtorgba(byte[] r, byte[] g, byte[] b, byte[] dest, int lptr) {
- for (int i = 0; i < b.length; i++) {
- dest[4 * i + lptr + 0] = r[i];
- dest[4 * i + lptr + 1] = g[i];
- dest[4 * i + lptr + 2] = b[i];
- dest[4 * i + lptr + 3] = (byte) 0xFF;
- }
- }
-
- private void rgbatorgba(byte[] r, byte[] g, byte[] b, byte[] a, byte[] dest, int lptr) {
- for (int i = 0; i < b.length; i++) {
- dest[4 * i + lptr + 0] = r[i];
- dest[4 * i + lptr + 1] = g[i];
- dest[4 * i + lptr + 2] = b[i];
- dest[4 * i + lptr + 3] = a[i];
- }
- }
-
- private byte[] readAll(DataInputStream in) throws IOException {
- byte[] dest = new byte[16384];
- int pos = 0;
- int numRead = 0;
-
- boolean done = false;
-
- do {
- numRead = in.read(dest, pos, dest.length - pos);
- if (pos == dest.length) {
- // Resize destination buffer
- byte[] newDest = new byte[2 * dest.length];
- System.arraycopy(dest, 0, newDest, 0, pos);
- dest = newDest;
- }
- if (numRead > 0) {
- pos += numRead;
- }
-
- done = ((numRead == -1) || (in.available() == 0));
- } while (!done);
-
- // Trim destination buffer
- if (pos != dest.length) {
- byte[] finalDest = new byte[pos];
- System.arraycopy(dest, 0, finalDest, 0, pos);
- dest = finalDest;
- }
-
- return dest;
- }
-
- public static void main(String[] args) {
- for (int i = 0; i < args.length; i++) {
- try {
- System.out.println(args[i] + ":");
- SGIImage image = SGIImage.read(args[i]);
- System.out.println(image);
- BufferedImage img = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
- WritableRaster raster = img.getRaster();
- DataBufferByte db = (DataBufferByte) raster.getDataBuffer();
- byte[] src = image.getData();
- byte[] dest = db.getData();
- for (int j = 0; j < src.length; j += 4) {
- dest[j + 0] = src[j + 3];
- dest[j + 1] = src[j + 2];
- dest[j + 2] = src[j + 1];
- dest[j + 3] = src[j + 0];
- }
- // System.arraycopy(src, 0, dest, 0, src.length);
- ImageIcon icon = new ImageIcon(img);
- JLabel label = new JLabel();
- label.setIcon(icon);
- JFrame frame = new JFrame(args[i]);
- frame.getContentPane().add(label);
- frame.pack();
- frame.show();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
-}
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