Fixed a bug related to cropping images from top=0 & left=0

lib/getFilterInfosAndTargetContentTypeFromQueryString.js

@@ -72,15 +72,16 @@ function isNumberWithin(num, min, max) {
 }
 
 function isValidOperation(name, args) {
+    var maxDimension = 16384;
     switch (name) {
     case 'crop':
         return args.length === 1 && /^(?:east|west|center|north(?:|west|east)|south(?:|west|east))/.test(args[0]);
     case 'rotate':
         return args.length === 0 || (args.length === 1 && (args[0] === 0 || args[0] === 90 || args[0] === 180 || args[0] === 270));
     case 'resize':
-        return args.length === 2 && isNumberWithin(args[0], 1, 16384) && isNumberWithin(args[1], 1, 16384);
+        return args.length === 2 && isNumberWithin(args[0], 1, maxDimension) && isNumberWithin(args[1], 1, maxDimension);
     case 'extract':
-        return args.length === 4 && isNumberWithin(args[0], 1, 16384) && isNumberWithin(args[1], 1, 16384) && isNumberWithin(args[2], 1, 16384) && isNumberWithin(args[3], 1, 16384);
+        return args.length === 4 && isNumberWithin(args[0], 0, maxDimension - 1) && isNumberWithin(args[1], 0, maxDimension - 1) && isNumberWithin(args[2], 1, maxDimension) && isNumberWithin(args[3], 1, maxDimension);
     case 'interpolateWith':
         return args.length === 1 && /^(?:nearest|bilinear|vertexSplitQuadraticBasisSpline|bicubic|locallyBoundedBicubic|nohalo)$/.test(args[0]);
     case 'background':

test/processImage.js

@@ -537,6 +537,12 @@ describe('express-processimage', function () {
         );
     });
 
+    it('should work fine when cropping an item starting from top 0 and left 0', function () {
+        return expect('GET /turtle.jpg?extract=0,0,300,200', 'to yield response', {
+            body: expect.it('to resemble', pathModule.resolve(__dirname, '..', 'testdata', 'turtleCropped300x200FromTopLeft.jpg'))
+        });
+    });
+
     describe('with the gm engine', function () {
         it('should allow a crop operation with a gravity of center', function () {
             return expect('GET /turtle.jpg?gm&resize=40,15&crop=center', 'to yield response', {