How do I create a Font Face using the latest version (3.3.6) LWJGL Freetype binding?

[giodas]

Not sure how to create a Font Face using LWJGL Freetype binding. Couldn't find enough documentation or any examples around it.

I can load the library, but I get a SIGSEGV error when I try to load the font file (a woff file).

Here is what I tried to do:

package org.example;

import org.lwjgl.*;
import org.lwjgl.system.*;
import org.lwjgl.util.freetype.FT_Face;

import java.io.IOException;
import java.io.InputStream;
import java.nio.*;

import static org.lwjgl.system.MemoryStack.*;
import static org.lwjgl.util.freetype.FreeType.*;

public class Main {

    public static void main(String[] args) {
        // For now just verify that the FreeType library loads correctly
        try (MemoryStack stack = stackPush()) {
            PointerBuffer pp = stack.mallocPointer(1);

            int err = FT_Init_FreeType(pp);
            if (err != FT_Err_Ok) {
                throw new IllegalStateException("Failed to initialize FreeType: " + FT_Error_String(err));
            }

            long library = pp.get(0);

            IntBuffer major = stack.mallocInt(1);
            IntBuffer minor = stack.mallocInt(1);
            IntBuffer patch = stack.mallocInt(1);

            FT_Library_Version(library, major, minor, patch);
            System.out.println("Loaded FreeType " + major.get(0) + "." + minor.get(0) + "." + patch.get(0));

            FT_Done_FreeType(library);

            // Load the WOFF file
            String fontPath = "AdelleSans-ThinItalic.woff";
            byte[] fontData;
            try (InputStream fileStream = Main.class.getResourceAsStream(fontPath)) {
                assert fileStream != null;
                fontData = fileStream.readAllBytes();
            }
            ByteBuffer fontByteBuffer = MemoryUtil.memAlloc(1024 * 1024);
            fontByteBuffer.put(fontData);
            fontByteBuffer.flip();
            PointerBuffer pointerBuffer = stack.mallocPointer(1); // not sure how to create the PointBuffer
            int error = FT_New_Memory_Face(library, fontByteBuffer, fontByteBuffer.remaining(), pointerBuffer);

            System.out.println(error);

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

Here is the error I get:

Task :org.example.Main.main() FAILED Loaded FreeType 2.13.3

A fatal error has been detected by the Java Runtime Environment:

SIGSEGV (0xb) at pc=0x000000012f240600, pid=44875, tid=259

JRE version: OpenJDK Runtime Environment Temurin-17.0.7+7 (17.0.7+7) (build 17.0.7+7) Java VM: OpenJDK 64-Bit Server VM Temurin-17.0.7+7 (17.0.7+7, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, bsd-aarch64) Problematic frame: C [libfreetype.dylib+0x8600]

[darriousliu]

Why do you called FT_Done_FreeType(library); to deinitialize the library before creating Face? This is clearly wrong.