From ebf5a7981f01065193f58a6f3e13e01123894ce0 Mon Sep 17 00:00:00 2001
From: nathan <nathan@dorkbox.com>
Date: Sun, 17 Sep 2017 16:28:38 +0200
Subject: [PATCH] Added clampMaxImageSize so an image will be a max of that
 size, but still maintain it's aspect ratio.

---
 src/dorkbox/util/ImageUtil.java | 42 +++++++++++++++++++++++++++++----
 1 file changed, 38 insertions(+), 4 deletions(-)

diff --git a/src/dorkbox/util/ImageUtil.java b/src/dorkbox/util/ImageUtil.java
index 12b2291..5291b27 100644
--- a/src/dorkbox/util/ImageUtil.java
+++ b/src/dorkbox/util/ImageUtil.java
@@ -39,6 +39,44 @@ import javax.swing.ImageIcon;
 public
 class ImageUtil {
 
+    /**
+     * @return returns an image, where the aspect ratio is kept, but the maximum size is maintained.
+     */
+    public static
+    BufferedImage clampMaxImageSize(final BufferedImage image, final int size) {
+        int width = image.getWidth(null);
+        int height = image.getHeight(null);
+
+        if (width <= size && height <= size) {
+            return image;
+        }
+
+        // scale width/height
+        if (width > size) {
+            double scaleRatio = (double) size / (double) width;
+            width = size;
+            height = (int) (height * scaleRatio);
+        }
+
+        if (height > size) {
+            double scaleRatio = (double) size / (double) height;
+            height = size;
+            width = (int) (width * scaleRatio);
+        }
+
+        int type = image.getType();
+        if (type == 0) {
+            type = BufferedImage.TYPE_INT_ARGB;
+        }
+
+        BufferedImage resizedImage = new BufferedImage(width, height, type);
+        Graphics2D g = resizedImage.createGraphics();
+        g.drawImage(image, 0, 0, width, height, null);
+        g.dispose();
+
+        return resizedImage;
+    }
+
     /**
      * There are issues with scaled images on Windows. This correctly scales the image.
      */
@@ -196,10 +234,6 @@ class ImageUtil {
      */
     public static
     BufferedImage getSquareBufferedImage(Image image) {
-        if (image instanceof BufferedImage) {
-            return (BufferedImage) image;
-        }
-
         int width = image.getWidth(null);
         int height = image.getHeight(null);