I need to be able to create a JPEG output stream in B4J so I can save images arriving via FTP in AWS S3 buckets as JPEGs (PNG doesn't cut it).
In B4A I was doing this without problems with code of form:
....WriteToStream(wrk_out, jpg_quality, "JPEG")
B4J apparently doesn't support JPEG (although B4A does - another of life's little mysteries).
I have been playing around with code I found here:
http://www.java2s.com/Code/Java/2D-...fileTheJPEGqualitycanbespecifiedinpercent.htm
So far I have:
Which dies with:
I can find no way around this and I really need to get it resolved - any and all help appreciated...
In B4A I was doing this without problems with code of form:
....WriteToStream(wrk_out, jpg_quality, "JPEG")
B4J apparently doesn't support JPEG (although B4A does - another of life's little mysteries).
I have been playing around with code I found here:
http://www.java2s.com/Code/Java/2D-...fileTheJPEGqualitycanbespecifiedinpercent.htm
So far I have:
B4X:
Private Sub WriteToStreamJPEG(In_image As Image, JPEG_quality As Int) As OutputStream
Private wrk_out As OutputStream
wrk_out.InitializeToBytesArray(0)
nativeMe.RunMethod("saveImageAsJPEG", Array(In_image, wrk_out, JPEG_quality))
' nativeMe.RunMethod("saveImageAsJPEG", Array(Array As Image (In_image), Array As OutputStream (wrk_out), Array As Int (JPEG_quality)))
Return wrk_out
End Sub
#If Java
//See http://www.java2s.com/Code/Java/2D-Graphics-GUI/WritesanimagetoanoutputstreamasaJPEGfileTheJPEGqualitycanbespecifiedinpercent.htm
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.Locale;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
/**
* Writes an image to an output stream as a JPEG file. The JPEG quality can
* be specified in percent.
*
* @param image
* image to be written
* @param stream
* target stream
* @param qualityPercent
* JPEG quality in percent
*
* @throws IOException
* if an I/O error occured
* @throws IllegalArgumentException
* if qualityPercent not between 0 and 100
*/
public static void saveImageAsJPEG(BufferedImage image,
OutputStream stream, int qualityPercent) throws IOException {
if ((qualityPercent < 0) || (qualityPercent > 100)) {
throw new IllegalArgumentException("Quality out of bounds!");
}
float quality = qualityPercent / 100f;
ImageWriter writer = null;
Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
if (iter.hasNext()) {
writer = (ImageWriter) iter.next();
}
ImageOutputStream ios = ImageIO.createImageOutputStream(stream);
writer.setOutput(ios);
ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
iwparam.setCompressionQuality(quality);
writer.write(null, new IIOImage(image, null, null), iwparam);
ios.flush();
writer.dispose();
ios.close();
}
#End IfExtensive googling would suggest my problem is trying to pass a B4J Image to a java BufferedImage.
I can find no way around this and I really need to get it resolved - any and all help appreciated...
