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+/*
+ * Portions copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
+ */
+
+package demos.util;
+
+import java.io.*;
+import net.java.games.jogl.*;
+
+// 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_EXT or GL.GL_BGRA_EXT. */
+ 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_EXT;
+ }
+
+ 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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