From 383aa4e4d9cf4b0997b9277df838728102e0db3c Mon Sep 17 00:00:00 2001
From: Odd Stråbø <oddstr13@openshell.no>
Date: Wed, 17 Mar 2021 00:15:09 +0100
Subject: Add Resize to fill box alternative to image endpoints

---
 MediaBrowser.Model/Drawing/DrawingUtils.cs | 48 ++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

(limited to 'MediaBrowser.Model/Drawing')

diff --git a/MediaBrowser.Model/Drawing/DrawingUtils.cs b/MediaBrowser.Model/Drawing/DrawingUtils.cs
index 1512c52337..8fb9bdc0ac 100644
--- a/MediaBrowser.Model/Drawing/DrawingUtils.cs
+++ b/MediaBrowser.Model/Drawing/DrawingUtils.cs
@@ -57,6 +57,54 @@ namespace MediaBrowser.Model.Drawing
             return new ImageDimensions(newWidth, newHeight);
         }
 
+        /// <summary>
+        /// Resizes to fill box.
+        /// Returns original size if both width and height are null or zero.
+        /// </summary>
+        /// <param name="size">The original size object.</param>
+        /// <param name="fillWidth">A new fixed width, if desired.</param>
+        /// <param name="fillHeight">A new fixed height, if desired.</param>
+        /// <returns>A new size object or size.</returns>
+        public static ImageDimensions ResizeFill(
+            ImageDimensions size,
+            int? fillWidth,
+            int? fillHeight)
+        {
+            // Return original size if input is invalid.
+            if (
+                (fillWidth == null && fillHeight == null)
+                || (fillWidth == 0 || fillHeight == 0))
+            {
+                return size;
+            }
+
+            if (fillWidth == null || fillWidth == 0)
+            {
+                fillWidth = 1;
+            }
+
+            if (fillHeight == null || fillHeight == 0)
+            {
+                fillHeight = 1;
+            }
+
+            double widthRatio = (double)size.Width / (double)fillWidth;
+            double heightRatio = (double)size.Height / (double)fillHeight!;
+            // min()
+            double scaleRatio = widthRatio > heightRatio ? heightRatio : widthRatio;
+
+            // Clamp to current size.
+            if (scaleRatio < 1)
+            {
+                return size;
+            }
+
+            int newWidth = Convert.ToInt32(Math.Ceiling((double)size.Width / scaleRatio));
+            int newHeight = Convert.ToInt32(Math.Ceiling((double)size.Height / scaleRatio));
+
+            return new ImageDimensions(newWidth, newHeight);
+        }
+
         /// <summary>
         /// Gets the new width.
         /// </summary>
-- 
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