/**
* Flushes any pending data and closes output file. If writing to an OutputStream, the stream is
* not closed.
*/
public boolean finish() {
if (!started) return false;
boolean ok = true;
started = false;
try {
out.write(0x3b); // gif trailer
out.flush();
if (closeStream) {
out.close();
}
} catch (IOException e) {
ok = false;
}
// reset for subsequent use
transIndex = 0;
out = null;
image = null;
pixels = null;
indexedPixels = null;
colorTab = null;
closeStream = false;
firstFrame = true;
return ok;
}
/** DOCUMENT ME! */
public void Compress() throws IOException {
WriteHeaders(out);
WriteCompressedData(out);
WriteEOI(out);
out.flush();
}
/**
* Writes the image out to a stream in the GIF file format. This will be a single GIF87a image,
* non-interlaced, with no background color. <B>This may take some time.</B>
*
* <p>
*
* @param output The stream to output to. This should probably be a buffered stream.
* @exception IOException Will be thrown if a write operation fails.
*/
public void Write(OutputStream output) throws IOException {
BitUtils.WriteString(output, "GIF87a");
ScreenDescriptor sd = new ScreenDescriptor(width_, height_, numColors_);
sd.Write(output);
output.write(colors_, 0, colors_.length);
ImageDescriptor id = new ImageDescriptor(width_, height_, ',');
id.Write(output);
byte codesize = BitUtils.BitsNeeded(numColors_);
if (codesize == 1) ++codesize;
output.write(codesize);
LZWCompressor.LZWCompress(output, codesize, pixels_);
output.write(0);
id = new ImageDescriptor((byte) 0, (byte) 0, ';');
id.Write(output);
output.flush();
}