GLFW窗口图标

Question

try {
            BufferedImage originalImage =
                    ImageIO.read(new File("favicon.png"));
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write( originalImage, "png", baos );
            baos.flush();
            byte[] imageInByte = baos.toByteArray();
            ByteBuffer buF = ByteBuffer.wrap(imageInByte);
            GLFWImage.Buffer b = new GLFWImage.Buffer(buF);
            glfwSetWindowIcon(window, b);
        } catch (IOException io){
            System.out.println("Could not load window icon!");
            System.out.println(io.toString());
        }

# A fatal error has been detected by the Java Runtime Environment:
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.

提前谢了。

Answer 1

这种解决方案是笨拙的；但是，它对我有效！：）它基于lwjgl事件演示中的代码，但要使用它，我必须实现演示Ioutil。设置图标的代码如下：

ByteBuffer icon16;
ByteBuffer icon32;
try {
    icon16 = IOUtil.ioResourceToByteBuffer("src/hexsweeper/hex16.png", 2048);
    icon32 = IOUtil.ioResourceToByteBuffer("src/hexsweeper/hex32.png", 4096);
} catch (Exception e) {
    throw new RuntimeException(e);
}

    
IntBuffer w = memAllocInt(1);
IntBuffer h = memAllocInt(1);
IntBuffer comp = memAllocInt(1);
    
try ( GLFWImage.Buffer icons = GLFWImage.malloc(2) ) {
    ByteBuffer pixels16 = stbi_load_from_memory(icon16, w, h, comp, 4);
    icons
        .position(0)
        .width(w.get(0))
        .height(h.get(0))
        .pixels(pixels16);

    ByteBuffer pixels32 = stbi_load_from_memory(icon32, w, h, comp, 4);
    icons
        .position(1)
        .width(w.get(0))
        .height(h.get(0))
        .pixels(pixels32);

    icons.position(0);
    glfwSetWindowIcon(window, icons);

    stbi_image_free(pixels32);
    stbi_image_free(pixels16);
}

进口情况如下：

import java.nio.ByteBuffer;
import java.nio.IntBuffer;

import org.lwjgl.glfw.GLFWImage;

import static org.lwjgl.stb.STBImage.*;
import static org.lwjgl.system.MemoryUtil.*;

在另一个文件（名为IOUtil）中，我放置了以下代码：

import org.lwjgl.BufferUtils;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import static org.lwjgl.BufferUtils.*;

public final class IOUtil {

private IOUtil() {
}

private static ByteBuffer resizeBuffer(ByteBuffer buffer, int newCapacity) {
    ByteBuffer newBuffer = BufferUtils.createByteBuffer(newCapacity);
    buffer.flip();
    newBuffer.put(buffer);
    return newBuffer;
}

/**
 * Reads the specified resource and returns the raw data as a ByteBuffer.
 *
 * @param resource   the resource to read
 * @param bufferSize the initial buffer size
 *
 * @return the resource data
 *
 * @throws IOException if an IO error occurs
 */
public static ByteBuffer ioResourceToByteBuffer(String resource, int bufferSize) throws IOException {
    ByteBuffer buffer;

    Path path = Paths.get(resource);
    if ( Files.isReadable(path) ) {
        try (SeekableByteChannel fc = Files.newByteChannel(path)) {
            buffer = BufferUtils.createByteBuffer((int)fc.size() + 1);
            while ( fc.read(buffer) != -1 ) ;
        }
    } else {
        try (
            InputStream source = IOUtil.class.getClassLoader().getResourceAsStream(resource);
            ReadableByteChannel rbc = Channels.newChannel(source)
        ) {
            buffer = createByteBuffer(bufferSize);

            while ( true ) {
                int bytes = rbc.read(buffer);
                if ( bytes == -1 )
                    break;
                if ( buffer.remaining() == 0 )
                    buffer = resizeBuffer(buffer, buffer.capacity() * 2);
            }
        }
    }

    buffer.flip();
    return buffer;
}

}