Base maximum output dimensions on limitation of format

lib/constructor.js

@@ -97,7 +97,7 @@ const Sharp = function (input, options) {
   this.options = {
     // input options
     sequentialRead: false,
-    limitInputPixels: maximum.pixels,
+    limitInputPixels: Math.pow(0x3FFF, 2),
     // ICC profiles
     iccProfilePath: path.join(__dirname, 'icc') + path.sep,
     // resize options
@@ -189,18 +189,6 @@ const Sharp = function (input, options) {
 };
 util.inherits(Sharp, stream.Duplex);
 
-/**
- * Pixel limits.
- * @member
- * @private
- */
-const maximum = {
-  width: 0x3FFF,
-  height: 0x3FFF,
-  pixels: Math.pow(0x3FFF, 2)
-};
-Sharp.maximum = maximum;
-
 /**
  * An EventEmitter that emits a `change` event when a task is either:
  * - queued, waiting for _libuv_ to provide a worker thread