feat: add image bed command

src/main/kotlin/cn/rtast/fancybot/util/misc/GIF.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/9/21
+ */
+
+
+package cn.rtast.fancybot.util.misc
+
+import com.madgag.gif.fmsware.AnimatedGifEncoder
+import com.madgag.gif.fmsware.GifDecoder
+import java.awt.image.BufferedImage
+import java.io.ByteArrayOutputStream
+
+fun GifDecoder.makeGif(frames: List<BufferedImage>): ByteArray {
+    val estimatedSize = frames.size * 50 * 1024
+    val byteArrayOutputStream = ByteArrayOutputStream(estimatedSize)
+    val encoder = AnimatedGifEncoder()
+    encoder.start(byteArrayOutputStream)
+    encoder.setRepeat(0)
+    val delays = frames.indices.map { this.getDelay(this.frameCount - it - 1) }
+    frames.indices.forEach { i ->
+        encoder.setDelay(delays[i])
+        encoder.addFrame(frames[i])
+    }
+    encoder.finish()
+    return byteArrayOutputStream.toByteArray()
+}