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#646: Spi now recognizes VP8 encoded images in VP8X ("extended format").

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This commit is contained in:
Harald Kuhr 2021-12-14 19:30:08 +01:00
parent 529c59f93f
commit 25c703f4b2
1 changed files with 27 additions and 1 deletions
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28
imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderSpi.java
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@ -35,6 +35,7 @@ import com.twelvemonkeys.imageio.spi.ImageReaderSpiBase;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteOrder;
import java.util.Locale;
@ -76,7 +77,8 @@ public final class WebPImageReaderSpi extends ImageReaderSpiBase {
switch (chunk) {
// TODO. Support lossless
// case WebP.CHUNK_VP8L:
// case WebP.CHUNK_VP8X:
case WebP.CHUNK_VP8X:
return containsSupportedChunk(stream, chunk);
case WebP.CHUNK_VP8_:
return true;
default:
@ -89,6 +91,30 @@ public final class WebPImageReaderSpi extends ImageReaderSpiBase {
}
}
private static boolean containsSupportedChunk(ImageInputStream stream, int chunk) throws IOException {
// Temporary: Seek for VP8_, either first or second (after ICCP), or inside ANMF...
try {
while (chunk != WebP.CHUNK_VP8L && chunk != WebP.CHUNK_ALPH) {
long length = stream.readUnsignedInt();
stream.seek(stream.getStreamPosition() + length);
chunk = stream.readInt();
// Look inside ANMF chunks...
if (chunk == WebP.CHUNK_ANMF) {
stream.seek(stream.getStreamPosition() + 4 + 16);
chunk = stream.readInt();
}
if (chunk == WebP.CHUNK_VP8_) {
return true;
}
}
}
catch (EOFException ignore) {}
return false;
}
@Override
public ImageReader createReaderInstance(final Object extension) {
return new WebPImageReader(this);