BufferedImage转换WritableImage

要将 `BufferedImage` 转换为 `WritableImage`，可以按照以下步骤进行操作：

1. 创建一个 `WritableImage` 对象，它的宽度和高度与 `BufferedImage` 相同。

WritableImage wImage = new WritableImage(bufferedImage.getWidth(), bufferedImage.getHeight());

2. 获取 `WritableImage` 的像素写入器，用于将像素数据从 `BufferedImage` 传输到 `WritableImage` 中。

PixelWriter writer = wImage.getPixelWriter();

3. 将 `BufferedImage` 的像素数据转换为 `javafx.scene.paint.Color` 对象，并将其写入到 `WritableImage` 中。

for (int x = 0; x < bufferedImage.getWidth(); x++) {
    for (int y = 0; y < bufferedImage.getHeight(); y++) {
        int argb = bufferedImage.getRGB(x, y);
        Color color = Color.rgb((argb >> 16) & 0xff, (argb >> 8) & 0xff, argb & 0xff, (argb >> 24) & 0xff);
        writer.setColor(x, y, color);
    }
}

完整的代码如下所示：

import java.awt.image.BufferedImage;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.paint.Color;

public class BufferedImageToWritableImage {

    public static WritableImage convert(BufferedImage bufferedImage) {
        WritableImage wImage = new WritableImage(bufferedImage.getWidth(), bufferedImage.getHeight());
        PixelWriter writer = wImage.getPixelWriter();
        for (int x = 0; x < bufferedImage.getWidth(); x++) {
            for (int y = 0; y < bufferedImage.getHeight(); y++) {
                int argb = bufferedImage.getRGB(x, y);
                Color color = Color.rgb((argb >> 16) & 0xff, (argb >> 8) & 0xff, argb & 0xff, (argb >> 24) & 0xff);
                writer.setColor(x, y, color);
            }
        }
        return wImage;
    }

    public static void main(String[] args) {
        BufferedImage bufferedImage = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
        WritableImage wImage = convert(bufferedImage);
        // Do something with the WritableImage...
    }
}