Adding option which defaults to 1. Set to 2 to get a twice as large image. Useful for Retina displays. Basically a shortcut to enlarge the image. #25

CImage.php

@@ -173,6 +173,12 @@ class CImage
     private $newHeight;
     private $newHeightOrig; // Save original value
 
+    
+    /**
+     * Change target height & width when different ppi, ppi 2 means double image dimensions.
+     */
+    private $ppi = 1;
+
 
     /**
      * Array with details on how to crop, incoming as argument and calculated.
@@ -353,6 +359,7 @@ class CImage
 
             // Output format
             'outputFormat' => null,
+            'ppi'          => 1,
 
             // Options for saving
             //'quality'     => null,
@@ -521,6 +528,18 @@ class CImage
             $this->log("Setting new height based on aspect ratio to {$this->newHeight}");
         }
 
+        // Change width & height based on ppi
+        if ($this->ppi != 1) {
+            if (!is_null($this->newWidth)) {
+                $this->newWidth  = round($this->newWidth * $this->ppi);
+                $this->log("Setting new width based on ppi={$this->ppi} - w={$this->newWidth}");
+            }
+            if (!is_null($this->newHeight)) {
+                $this->newHeight = round($this->newHeight * $this->ppi);
+                $this->log("Setting new height based on ppi={$this->ppi} - h={$this->newHeight}");
+            }
+        }
+
         // Check values to be within domain
         is_null($this->newWidth)
             or is_numeric($this->newWidth)

README.md

@@ -133,6 +133,7 @@ Revision history
 
 v0.5.x (latest)
 
+* Adding option `ppi` which defaults to 1. Set to 2 to get a twice as large image. Useful for Retina displays. Basically a shortcut to enlarge the image.
 * Adding utility `cache.bash` to ease gathering stats on cache usage. #21
 * Cache-directory can now be readonly and serve all cached files, still failing when need to save files. #5
 * Cache now uses same file extension as original image #37. 

webroot/img.php

@@ -463,6 +463,15 @@ verbose("json = $outputFormat");
 
 
 
+/**
+ * ppi - change to get larger image to easier support larger ppi, such as retina.
+ */
+$ppi = get('ppi', 1);
+
+verbose("ppi = $ppi");
+
+
+
 /**
  * Display image if verbose mode
  */
@@ -522,6 +531,7 @@ $img->setVerbose($verbose)
 
             // Output format
             'outputFormat' => $outputFormat,
+            'ppi'          => $ppi,
         )
     )
     ->loadImageDetails()