diff --git a/WellspringCS.cs b/WellspringCS.cs
index ea4d0df..7aea1fe 100644
--- a/WellspringCS.cs
+++ b/WellspringCS.cs
@@ -101,29 +101,9 @@ namespace WellspringCS
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
 		public static extern IntPtr Wellspring_CreateFont(
 			IntPtr fontBytes,
-			uint fontBytesLength
-		);
-
-		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
-		public static extern IntPtr Wellspring_CreatePacker(
-			IntPtr Font,
-			float fontSize,
-			uint width,
-			uint height,
-			uint strideInBytes,
-			uint padding
-		);
-
-		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
-		public static extern uint Wellspring_PackFontRanges(
-			IntPtr packer,
-			IntPtr ranges, /* FontRange array */
-			uint numRanges
-		);
-
-		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
-		public static extern IntPtr Wellspring_GetPixelDataPointer(
-			IntPtr packer
+			uint fontBytesLength,
+			IntPtr atlasJsonBytes,
+			uint atlasJsonBytesLength
 		);
 
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
@@ -132,12 +112,12 @@ namespace WellspringCS
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
 		public static extern void Wellspring_StartTextBatch(
 			IntPtr textBatch,
-			IntPtr packer
+			IntPtr font
 		);
 
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
 		public static extern byte Wellspring_TextBounds(
-			IntPtr packer,
+			IntPtr font,
 			float x,
 			float y,
 			HorizontalAlignment horizontalAlignment,
@@ -175,11 +155,6 @@ namespace WellspringCS
 			IntPtr textBatch
 		);
 
-		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
-		public static extern void Wellspring_DestroyPacker(
-			IntPtr packer
-		);
-
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
 		public static extern void Wellspring_DestroyFont(
 			IntPtr font