[DW-34] add dynamic treshold (.net6+)

Author: ikkyuland

IronSoftware.Drawing/IronSoftware.Drawing.Common/AnyBitmap.cs

@@ -3040,7 +3040,25 @@ object ICloneable.Clone()
         /// <returns></returns>
         private static IImageEncoder GetDefaultImageImportEncoder(int imageWidth, int imageHeight)
         {
-            const int threshold = 1920 * 1080;
+
+            int threshold = 1920 * 1080; //FHD
+#if NET6_0_OR_GREATER
+            long totalBytes = GC.GetGCMemoryInfo().TotalAvailableMemoryBytes;
+            long totalGB = totalBytes / (1024L * 1024 * 1024);
+
+            if (totalGB <= 2)
+                threshold = 1280 * 720; //HD
+            else if (totalGB <= 4)
+                threshold = 1920 * 1080; //FHD
+            else if (totalGB <= 8)
+                threshold = 2560 * 1440; //2K
+            else if (totalGB <= 16)
+                threshold = 4096 * 2160; //4K
+            else if (totalGB <= 32)
+                threshold = 7680 * 4320; //8K
+            else if (totalGB <= 64)
+                threshold = 15360 * 8640; //16K
+#endif
             if (imageWidth * imageHeight <= threshold)
             {
                 //small Image
@@ -3181,7 +3199,7 @@ private static void InternalSaveAsMultiPageGif(IEnumerable<Image> images, Stream
             }
         }
 
-        #endregion
+#endregion
 
         [Browsable(false)]
         [Bindable(false)]