Image

Overview

Module

• package: org.eclipse.dirigible.sdk.io
• source: io/Image.java

Image resize helper. Reads from any InputStream (file, HTTP body, in-memory buffer), scales the image to the requested dimensions, and returns a fresh stream you can pipe into the next sink. The type argument is the output format ("png", "jpg", ...) — the platform uses javax.imageio.ImageIO under the hood, so the supported list matches whatever codecs are on the JVM classpath.

For more advanced transformations (crop, rotate, compose) drop down to ImageIO or a dedicated library and bring the bytes back through Streams.

Key Features:

• Stream-friendly: Takes any InputStream source and returns an InputStream you can pipe forward.
• Format conversion: Output format is decided by the type argument independently of the input.
• Pluggable codecs: Uses javax.imageio.ImageIO, so any extra codecs on the classpath light up automatically.

Example Usage:

import java.io.InputStream;
import org.eclipse.dirigible.sdk.io.Files;
import org.eclipse.dirigible.sdk.io.Image;
import org.eclipse.dirigible.sdk.io.Streams;

try (InputStream src = Files.exists("/var/data/in.png")
        ? java.nio.file.Files.newInputStream(java.nio.file.Paths.get("/var/data/in.png"))
        : null) {
    InputStream resized = Image.resize(src, "png", 256, 256);
    byte[] data = Streams.readBytes(resized);
    // ... write `data` somewhere
}

Methods

resize()

Resizes the image read from original to the given width and height, encoding the result as type and returning a new InputStream over the encoded bytes.

public static InputStream resize(InputStream original, String type, int width, int height) throws IOException;

Parameter	Type	Description
original	InputStream	Source stream over the original image bytes.
type	String	Output image format (e.g. "png", "jpg").
width	int	Target width in pixels.
height	int	Target height in pixels.

Returns

• Type: InputStream
• Description: A new stream over the resized image bytes.