JavaCPP Presets for LibRaw

^{Build status for all platforms: Commercial support:}

Introduction

This directory contains the JavaCPP Presets module for:

• LibRaw 0.20.2 https://www.libraw.org/

Please refer to the parent README.md file for more detailed information about the JavaCPP Presets.

Documentation

Java API documentation is available here:

• http://bytedeco.org/javacpp-presets/libraw/apidocs/

Sample Usage

Here is an example of implementing dcraw functionality using LibRaw ported to Java from this C++ source file:

• https://github.com/LibRaw/LibRaw/blob/master/samples/dcraw_emu.cpp

We can use Maven 3 to download and install automatically all the class files as well as the native binaries. To run this sample code, after creating the pom.xml and LibRawDemo.java source files below, simply execute on the command line:

 $ mvn compile exec:java"

The pom.xml build file

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.bytedeco.libraw</groupId>
    <artifactId>librawdemo</artifactId>
    <version>1.5.9-SNAPSHOT</version>
    <properties>
        <exec.mainClass>LibRawDemo</exec.mainClass>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>libraw-platform</artifactId>
            <version>0.20.2-1.5.9-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <build>
        <sourceDirectory>.</sourceDirectory>
    </build>
</project>

The LibRawDemo.java source file

import org.bytedeco.javacpp.BytePointer;
import org.bytedeco.libraw.LibRaw;
import org.bytedeco.libraw.libraw_output_params_t;

import static org.bytedeco.libraw.global.LibRaw.*;

public class LibRawDemo {
    public static String libRawVersion() {
        try (BytePointer version = LibRaw.version()) {
            return version.getString();
        }
    }

    public static void handleError(int err, String message) {
        if (err != LibRaw_errors.LIBRAW_SUCCESS.value) {
            final String msg;
            try (BytePointer e = libraw_strerror(err)) {
                msg = e.getString();
            }
            System.err.println(message + " : " + msg);
            System.exit(err);
        }
    }

    public static void main(String[] args) {
        System.out.println("");
        System.out.println("LibRaw.version(): " + libRawVersion());

        try (LibRaw rawProcessor = new LibRaw()) {
            // Set processing parameters
            libraw_output_params_t params = rawProcessor.imgdata().params();
            params.half_size(1); // Create half size image
            params.output_tiff(1); // Save as TIFF

            String srcFile = "my_sample_image.dng";
            System.out.println("Reading: " + srcFile);
            int ret = rawProcessor.open_file(srcFile);
            handleError(ret, "Cannot open " + srcFile);

            System.out.println("Unpacking: " + srcFile);
            ret = rawProcessor.unpack();
            handleError(ret, "Cannot unpack " + srcFile);

            System.out.println("Processing");
            ret = rawProcessor.dcraw_process();
            handleError(ret, "Cannot process" + srcFile);

            String dstFile = "my_sample_image.tif";
            System.out.println("Writing file: " + dstFile);
            ret = rawProcessor.dcraw_ppm_tiff_writer(dstFile);
            handleError(ret, "Cannot write " + dstFile);

            System.out.println("Cleaning up");
            rawProcessor.recycle();
        }

        System.out.println("Done");
        System.exit(LibRaw_errors.LIBRAW_SUCCESS.value);
    }
}