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package jogamp.opengl.util.pngj.chunks;
import jogamp.opengl.util.pngj.ImageInfo;
import jogamp.opengl.util.pngj.PngHelperInternal;
import jogamp.opengl.util.pngj.PngjException;
/**
* gAMA chunk.
* <p>
* see http://www.w3.org/TR/PNG/#11gAMA
*/
public class PngChunkGAMA extends PngChunkSingle {
public final static String ID = ChunkHelper.gAMA;
// http://www.w3.org/TR/PNG/#11gAMA
private double gamma;
public PngChunkGAMA(final ImageInfo info) {
super(ID, info);
}
@Override
public ChunkOrderingConstraint getOrderingConstraint() {
return ChunkOrderingConstraint.BEFORE_PLTE_AND_IDAT;
}
@Override
public ChunkRaw createRawChunk() {
final ChunkRaw c = createEmptyChunk(4, true);
final int g = (int) (gamma * 100000 + 0.5);
PngHelperInternal.writeInt4tobytes(g, c.data, 0);
return c;
}
@Override
public void parseFromRaw(final ChunkRaw chunk) {
if (chunk.len != 4)
throw new PngjException("bad chunk " + chunk);
final int g = PngHelperInternal.readInt4fromBytes(chunk.data, 0);
gamma = (g) / 100000.0;
}
@Override
public void cloneDataFromRead(final PngChunk other) {
gamma = ((PngChunkGAMA) other).gamma;
}
public double getGamma() {
return gamma;
}
public void setGamma(final double gamma) {
this.gamma = gamma;
}
}
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