in src/main/java/org/apache/sling/thumbnails/internal/transformers/RotateHandler.java [45:52]
public void handle(InputStream inputStream, OutputStream outputStream, TransformationHandlerConfig config)
throws IOException {
Builder<? extends InputStream> builder = Thumbnails.of(inputStream);
double degrees = config.getProperties().get(DEGREES, 0.0);
builder.rotate(degrees);
builder.scale(1.0);
builder.toOutputStream(outputStream);
}