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package com.bumptech.glide.load.resource.gif;
import android.graphics.Bitmap;
import android.util.Log;
import com.bumptech.glide.gifdecoder.GifDecoder;
import com.bumptech.glide.gifdecoder.GifHeader;
import com.bumptech.glide.gifdecoder.GifHeaderParser;
import com.bumptech.glide.gifencoder.AnimatedGifEncoder;
import com.bumptech.glide.load.ResourceEncoder;
import com.bumptech.glide.load.Transformation;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.UnitTransformation;
import com.bumptech.glide.load.resource.bitmap.BitmapResource;
import com.bumptech.glide.util.LogTime;
import java.io.IOException;
import java.io.OutputStream;
/**
* An {@link com.bumptech.glide.load.ResourceEncoder} that can write
* {@link com.bumptech.glide.load.resource.gif.GifDrawable} to cache.
*/
public class GifResourceEncoder implements ResourceEncoder<GifDrawable> {
private static final Factory FACTORY = new Factory();
private static final String TAG = "GifEncoder";
private final GifDecoder.BitmapProvider provider;
private final BitmapPool bitmapPool;
private final Factory factory;
public GifResourceEncoder(BitmapPool bitmapPool) {
this(bitmapPool, FACTORY);
}
// Visible for testing.
GifResourceEncoder(BitmapPool bitmapPool, Factory factory) {
this.bitmapPool = bitmapPool;
provider = new GifBitmapProvider(bitmapPool);
this.factory = factory;
}
@Override
public boolean encode(Resource<GifDrawable> resource, OutputStream os) {
long startTime = LogTime.getLogTime();
GifDrawable drawable = resource.get();
Transformation<Bitmap> transformation = drawable.getFrameTransformation();
if (transformation instanceof UnitTransformation) {
return writeDataDirect(drawable.getData(), os);
}
GifDecoder decoder = decodeHeaders(drawable.getData());
AnimatedGifEncoder encoder = factory.buildEncoder();
if (!encoder.start(os)) {
return false;
}
for (int i = 0; i < decoder.getFrameCount(); i++) {
Bitmap currentFrame = decoder.getNextFrame();
Resource<Bitmap> transformedResource = getTransformedFrame(currentFrame, transformation, drawable);
try {
if (!encoder.addFrame(transformedResource.get())) {
return false;
}
int currentFrameIndex = decoder.getCurrentFrameIndex();
int delay = decoder.getDelay(currentFrameIndex);
encoder.setDelay(delay);
decoder.advance();
} finally {
transformedResource.recycle();
}
}
boolean result = encoder.finish();
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Encoded gif with " + decoder.getFrameCount() + " frames and " + drawable.getData().length
+ " bytes in " + LogTime.getElapsedMillis(startTime) + " ms");
}
return result;
}
private boolean writeDataDirect(byte[] data, OutputStream os) {
boolean success = true;
try {
os.write(data);
} catch (IOException e) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Failed to write data to output stream in GifResourceEncoder", e);
}
success = false;
}
return success;
}
private GifDecoder decodeHeaders(byte[] data) {
GifHeaderParser parser = factory.buildParser();
parser.setData(data);
GifHeader header = parser.parseHeader();
GifDecoder decoder = factory.buildDecoder(provider);
decoder.setData(header, data);
decoder.advance();
return decoder;
}
private Resource<Bitmap> getTransformedFrame(Bitmap currentFrame, Transformation<Bitmap> transformation,
GifDrawable drawable) {
// TODO: what if current frame is null?
Resource<Bitmap> bitmapResource = factory.buildFrameResource(currentFrame, bitmapPool);
Resource<Bitmap> transformedResource = transformation.transform(bitmapResource,
drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
if (!bitmapResource.equals(transformedResource)) {
bitmapResource.recycle();
}
return transformedResource;
}
@Override
public String getId() {
return "";
}
// Visible for testing.
static class Factory {
public GifDecoder buildDecoder(GifDecoder.BitmapProvider bitmapProvider) {
return new GifDecoder(bitmapProvider);
}
public GifHeaderParser buildParser() {
return new GifHeaderParser();
}
public AnimatedGifEncoder buildEncoder() {
return new AnimatedGifEncoder();
}
public Resource<Bitmap> buildFrameResource(Bitmap bitmap, BitmapPool bitmapPool) {
return new BitmapResource(bitmap, bitmapPool);
}
}
}
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