/
Image.java
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/
Image.java
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package io.github.spencerpark.jupyter.kernel.display.common;
import io.github.spencerpark.jupyter.kernel.display.RenderContext;
import io.github.spencerpark.jupyter.kernel.display.Renderer;
import io.github.spencerpark.jupyter.kernel.display.mime.MIMEType;
import javax.imageio.ImageIO;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Base64;
public class Image {
public static final MIMEType PNG = MIMEType.IMAGE_PNG;
public static final MIMEType JPEG = MIMEType.IMAGE_JPEG;
public static final MIMEType GIF = MIMEType.IMAGE_GIF;
public static final MIMEType SVG = MIMEType.IMAGE_SVG;
public static void registerAll(Renderer renderer) {
renderer.createRegistration(java.awt.image.RenderedImage.class)
.preferring(PNG)
.supporting(JPEG, GIF)
.register(Image::renderImage);
renderer.createRegistration(InputStream.class)
.preferring(PNG)
.supporting(JPEG, GIF)
.register(Image::renderImageFromStream);
}
private static String imageTob64(java.awt.image.RenderedImage image, String fmt) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
ImageIO.write(image, fmt, Base64.getEncoder().wrap(out));
return out.toString("UTF-8");
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static void renderImage(java.awt.image.RenderedImage data, RenderContext context) {
context.renderIfRequested(PNG, () -> imageTob64(data, "png"));
context.renderIfRequested(JPEG, () -> imageTob64(data, "jpeg"));
context.renderIfRequested(GIF, () -> imageTob64(data, "gif"));
}
public static void renderImageFromStream(InputStream data, RenderContext context) {
try {
renderImage(ImageIO.read(data), context);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}