public Gif(PApplet parent, String filename) {
// this creates a fake image so that the first time this
// attempts to draw, something happens that's not an exception
super(1, 1, ARGB);
this.parent = parent;
// create the GifDecoder
GifDecoder gifDecoder = createDecoder(parent, filename);
// fill up the PImage and the delay arrays
frames = extractFrames(gifDecoder);
delays = extractDelays(gifDecoder);
// get the GIFs repeat count
repeatSetting = gifDecoder.getLoopCount();
// re-init our PImage with the new size
super.init(frames[0].width, frames[0].height, ARGB);
jump(0);
parent.registerMethod("dispose", this);
// and now, make the magic happen
runner = new Thread(this);
runner.start();
}
/*
* creates an int-array of frame delays in the gifDecoder object
*/
private static int[] extractDelays(GifDecoder gifDecoder) {
int n = gifDecoder.getFrameCount();
int[] delays = new int[n];
for (int i = 0; i < n; i++) {
delays[i] = gifDecoder.getDelay(i); // display duration of frame in
// milliseconds
}
return delays;
}
/*
* creates a PImage-array of gif frames in a GifDecoder object
*/
private static PImage[] extractFrames(GifDecoder gifDecoder) {
int n = gifDecoder.getFrameCount();
PImage[] frames = new PImage[n];
for (int i = 0; i < n; i++) {
BufferedImage frame = gifDecoder.getFrame(i);
frames[i] = new PImage(frame.getWidth(), frame.getHeight(), ARGB);
System.arraycopy(
frame.getRGB(0, 0, frame.getWidth(), frame.getHeight(), null, 0, frame.getWidth()),
0,
frames[i].pixels,
0,
frame.getWidth() * frame.getHeight());
}
return frames;
}
/*
* creates a GifDecoder object and loads a gif file
*/
private static GifDecoder createDecoder(PApplet parent, String filename) {
GifDecoder gifDecoder = new GifDecoder();
gifDecoder.read(createInputStream(parent, filename));
return gifDecoder;
}