* @throws IOException
*/
public static APNG convertGiftoAPNG(File readGif,I_UIupdater callback) throws IOException{
APNG theApng=null;
FileInputStream fis=null;
GIFImageReader reader=null;
try{
fis=new FileInputStream(readGif);
reader = (GIFImageReader) ImageIO.getImageReadersByFormatName("GIF").next();
ImageInputStream iis = ImageIO.createImageInputStream(fis);
reader.setInput(iis);
int numImages=reader.getNumImages(true);
boolean hasLocalColors=false;
boolean hasTransparecy=false;
int iTransparency=-1;
GIFStreamMetadata smd=(GIFStreamMetadata) reader.getStreamMetadata();
//Analyze, which mode will be used
GIFImageMetadata md;
for(int i=0;i<numImages;i++){
md=(GIFImageMetadata) reader.getImageMetadata(i);
if(md.transparentColorFlag){
iTransparency=md.transparentColorIndex;
hasTransparecy=true;
}
if(md.localColorTable!=null){
hasLocalColors=true;
}
}
Emodes mode=Emodes.PALETTE; // for no local Colortables and no/single-transparency
// and NO animation
int decision=0;
if(hasLocalColors){
decision+=1;
}
if(hasTransparecy){
decision+=2;
}
if((numImages>1)){
decision+=4;
}
switch(decision){
default:
case 0: case 2:
mode=Emodes.PALETTE;
break;
case 1: case 4: case 5:
mode=Emodes.RGB;
break;
case 3: case 6: case 7:
mode=Emodes.ARGB;
break;
}
md=(GIFImageMetadata) reader.getImageMetadata(0);
if(md.imageLeftPosition>0 || md.imageTopPosition>0
|| md.imageHeight!=smd.logicalScreenHeight
|| md.imageWidth!=smd.logicalScreenWidth){
// first frame must have no offset!
// mode set to ARGB, image will be altered before addFrame()
mode=Emodes.ARGB;
}
int numLoops=ChunkacTL.INFINITE_LOOP;
GifInfo readgifinfo=new GifInfo(readGif);
numLoops=readgifinfo.getLoops();
theApng=new APNG(smd.logicalScreenWidth,smd.logicalScreenHeight,mode, numLoops,
(mode==Emodes.PALETTE)? smd.globalColorTable : null, iTransparency);
//now add frames (by using BufferedImage)
//tell callback how many frame there are
if(callback!=null){
callback.updatemax(numImages);
}
// prepare our workers
ExecutorService threadExecutor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
// Disposal-Methods:
// method name(gif-method-number -> apng-method-number):
// unknown(0->0(ignored)), no disposal(1->0)
// restore to background(2->1), restore to previous(3->2)
int seqNr = 0;
for(int i=0;i<numImages;i++){
//if stop-button is clicked
if(Thread.currentThread().isInterrupted()){
//close reader & stream
reader.dispose();
fis.close();
throw new CancellationException("stop-button was pushed");
}
//callback current frame:
if(callback!=null){
callback.updatecur(i+1);
}
md=(GIFImageMetadata) reader.getImageMetadata(i);
int idismet=md.disposalMethod;
if(idismet>0 && idismet<=3){
idismet=idismet-1;
}
if(i==0 && (md.imageLeftPosition>0 || md.imageTopPosition>0
|| md.imageHeight!=smd.logicalScreenHeight
|| md.imageWidth!=smd.logicalScreenWidth)){
// first frame must have no offset!
BufferedImage tmp=new BufferedImage(smd.logicalScreenWidth,
smd.logicalScreenHeight,BufferedImage.TYPE_INT_ARGB);
Graphics tmpg=tmp.getGraphics();
tmpg.setColor(new Color(0,0,0,0));
tmpg.fillRect(0, 0, smd.logicalScreenWidth, smd.logicalScreenHeight);
tmpg.drawImage(reader.read(i), md.imageLeftPosition, md.imageTopPosition, null);
//theApng.addFrame(tmp, 0, 0, md.delayTime, idismet);
FrameThread ft = new FrameThread(theApng,tmp, 0, 0, md.delayTime, idismet,seqNr);
threadExecutor.execute(ft);
} else {
FrameThread ft = new FrameThread(theApng,reader.read(i), md.imageLeftPosition, md.imageTopPosition,md.delayTime, idismet,seqNr);
threadExecutor.execute(ft);
}
// incr seqnr
if (i == 0)
{
seqNr++; // first idat has no seqnr
}
else
{
seqNr+=2;
}
} // add all frames
// all threads should come to an end now
threadExecutor.shutdown(); // shutdown worker threads
while (!threadExecutor.isTerminated())
{
try
{
threadExecutor.awaitTermination(60,TimeUnit.SECONDS);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
// seperate chunk list has to be now integrated
// this has to happen because of the parallel working threads
theApng.integrateChunks();
//add tEXt-chunk here
theApng.maChunks.add(new ChunktEXt()); //software-note
//and all comments from the gif:
theApng.maChunks.add(new ChunktEXt("Comment",readgifinfo.getComment()));
//close reader & stream
reader.dispose();
fis.close();
//callback completion of all frames / beginning of write-operation, which should follow
if(callback!=null){
callback.updatecur(numImages+1);
}
} catch (IOException ex){
//close reader & stream
if(reader!=null){
reader.dispose();
}
if(fis!=null){
fis.close();
}
throw ex;//and pass through
} catch (RuntimeException ex){
//close reader & stream
if(reader!=null){
reader.dispose();
}
if(fis!=null){
fis.close();
}
throw ex;//and pass through