feat: added Image.toByteArray() and toBase64()

Author: AlmasB

fxgl-core/src/main/kotlin/com/almasb/fxgl/texture/Images.kt

@@ -17,8 +17,10 @@ import javafx.scene.effect.BlendMode
 import javafx.scene.image.*
 import javafx.scene.paint.Color
 import javafx.scene.shape.Rectangle
+import java.io.ByteArrayOutputStream
 import java.nio.file.Files
 import java.nio.file.Path
+import java.util.Base64
 import java.util.concurrent.Callable
 import javax.imageio.ImageIO
 import kotlin.math.abs
@@ -608,6 +610,20 @@ fun Image.subImage(area: Rectangle2D): Image {
     return newImage
 }
 
+fun Image.toByteArray(): ByteArray {
+    val awtImage = toBufferedImage(this)
+
+    val baos = ByteArrayOutputStream()
+
+    ImageIO.write(awtImage, "png", baos)
+
+    return baos.toByteArray()
+}
+
+fun Image.toBase64(): String {
+    return Base64.getEncoder().encodeToString(this.toByteArray())
+}
+
 /**
  * @return the sum of rgb values, which is in range [0..3]
  */

fxgl-core/src/test/kotlin/com/almasb/fxgl/texture/ImagesTest.kt

@@ -105,4 +105,15 @@ class ImagesTest {
 
         assertThat(result, `is`(0.0))
     }
+
+    @Test
+    fun `Convert to base64`() {
+        val img1 = ColoredTexture(100, 100, Color.WHITE).image
+
+        val s = img1.toBase64()
+
+        assertThat(s, `is`(
+            "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAA/ElEQVR4Xu3RoQEAMAyAsP7/dOv3wBCJxDJLyryBvwyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTGkBhDYgyJMSTmAPgrrNZaawxDAAAAAElFTkSuQmCC"
+        ))
+    }
 }