Added option - no-upscale, nu - as resizing strategy to decline upscaling of smaller images. Fix #61.

webroot/img.php

@@ -529,6 +529,15 @@ verbose("convolve = " . print_r($convolve, 1));
 
 
 
+/**
+ * no-upscale, nu - Do not upscale smaller image to larger dimension.
+ */
+$upscale = getDefined(array('no-upscale', 'nu'), false, true);
+
+verbose("upscale = $upscale");
+
+
+
 /**
  * Display image if verbose mode
  */
@@ -565,6 +574,7 @@ $img->log("Incoming arguments: " . print_r(verbose(), 1))
             'fillToFit' => $fillToFit,
             'crop'      => $crop,
             'area'      => $area,
+            'upscale'   => $upscale,
 
             // Pre-processing, before resizing is done
             'scale'        => $scale,

webroot/test/test_option-no-upscale.php

@@ -0,0 +1,50 @@
+<?php
+// Include config for all testcases
+include __DIR__ . "/config.php";
+
+
+
+// The title of the test case
+$title = "Testing option no-upscale";
+
+
+
+// Provide a short description of the testcase.
+$description = "Do not upscale image when original image (slice) is smaller than target image.";
+
+
+
+// Use these images in the test
+$images = array(
+    'car.png',
+);
+
+
+
+// For each image, apply these testcases
+$nc = null; //"&nc"; //null; //&nc'; 
+$testcase = array(
+    $nc . '&w=600',
+    $nc . '&w=600&no-upscale',
+    $nc . '&h=400',
+    $nc . '&h=400&no-upscale',
+    $nc . '&w=600&h=400',
+    $nc . '&w=600&h=400&no-upscale',
+    $nc . '&w=600&h=400&stretch',
+    $nc . '&w=600&h=400&no-upscale&stretch',
+    $nc . '&w=600&h=400&crop-to-fit',
+    $nc . '&w=600&h=400&no-upscale&crop-to-fit',
+    $nc . '&w=600&h=400&fill-to-fit',
+    $nc . '&w=600&h=400&no-upscale&fill-to-fit',
+/*
+    $nc . '&w=600&ar=1.6',
+    $nc . '&w=600&ar=1.6&no-upscale',
+    $nc . '&h=400&ar=1.6',
+    $nc . '&h=400&ar=1.6&no-upscale',
+*/
+);
+
+
+
+// Apply testcases and present results
+include __DIR__ . "/template.php";