private void decodeImage(final DataInputStream in) throws IOException {
if (header.storage == 1) {
// Read RLE compression data; row starts and sizes
final 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);
final int xsize = header.xsize;
final int ysize = header.ysize;
final int zsize = header.zsize;
int lptr = 0;
data = new byte[xsize * ysize * 4];
final byte[] rbuf = new byte[xsize];
final byte[] gbuf = new byte[xsize];
final byte[] bbuf = new byte[xsize];
final 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_RGBA;
header.zsize = 4;
}
/** Creates an SGIImage from the specified data in either RGB or RGBA format. */
public static SGIImage createFromData(
final int width, final int height, final boolean hasAlpha, final byte[] data) {
final Header header = new Header();
header.xsize = (short) width;
header.ysize = (short) height;
header.zsize = (short) (hasAlpha ? 4 : 3);
final SGIImage image = new SGIImage(header);
image.data = data;
return image;
}