From c9aa0e74b961be30588437f7be4be315eb47a06f Mon Sep 17 00:00:00 2001
From: Simon Elvery <simon@elvery.net>
Date: Mon, 26 Mar 2012 14:21:14 +1000
Subject: [PATCH] ENHANCEMENT: Before preforming an image resize, make sure
 it's actually required.

This is better from an efficiency point of view and it also eliminates unessesary re-sampling (i.e. reduction in quailty).
---
 filesystem/GD.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/filesystem/GD.php b/filesystem/GD.php
index 667265096..16eccff93 100644
--- a/filesystem/GD.php
+++ b/filesystem/GD.php
@@ -64,6 +64,11 @@ class GD extends Object {
 		$width = round($width);
 		$height = round($height);
 		
+		// Check that a resize is actually necessary.
+		if ($width == $this->width && $height == $this->height) {
+			return $this;
+		}
+		
 		$newGD = imagecreatetruecolor($width, $height);
 		
 		// Preserves transparency between images
@@ -125,6 +130,11 @@ class GD extends Object {
 		$width = round($width);
 		$height = round($height);
 		
+		// Check that a resize is actually necessary.
+		if ($width == $this->width && $height == $this->height) {
+			return $this;
+		}
+		
 		if(!$width && !$height) user_error("No dimensions given", E_USER_ERROR);
 		if(!$width) user_error("Width not given", E_USER_ERROR);
 		if(!$height) user_error("Height not given", E_USER_ERROR);
@@ -299,6 +309,10 @@ class GD extends Object {
 		$width = round($width);
 		$height = round($height);
 		
+		// Check that a resize is actually necessary.
+		if ($width == $this->width && $height == $this->height) {
+			return $this;
+		}
 		
 		$newGD = imagecreatetruecolor($width, $height);