From e8f095f33c39204963ebe74bced8d955f8176688 Mon Sep 17 00:00:00 2001
From: Tom Harrington <tph@atomicbird.com>
Date: Sat, 2 Jun 2012 15:59:26 -0600
Subject: [PATCH] Add fixpng.sh for convenient fixing of iOS-optimized PNGs.

---
 README.md |  6 ++++--
 fixpng.sh | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 2 deletions(-)
 create mode 100644 fixpng.sh

diff --git a/README.md b/README.md
index 08fbd3c..fef1b0d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Atomic Tools
 
-A collection of useful Objective-C code. Most of this has been blogged about at [Cocoa is my Girlfriend](http://www.cimgf.com/).
+A collection of useful Objective-C code and other items of use to iOS and Mac OS X developers. Most of this has been blogged about at [Cocoa is my Girlfriend](http://www.cimgf.com/).
 
 * `NSObject+setValuesForKeysWithJSONDictionary.h`: Safer alternative to `setValuesForKeysWithDictionary:` for use when importing JSON. Works with any object with declared properties corresponding to JSON dictionary keys. Detailed discussion is at [CIMGF](http://www.cimgf.com/2012/01/11/handling-incoming-json-redux/).
 
@@ -8,6 +8,8 @@ A collection of useful Objective-C code. Most of this has been blogged about at
 
 * `NSData+reallyMapped.h`: Create an NSData object using a memory mapped file. Works even though `dataWithContentsOfMappedFile:` is deprecated in iOS 5.0 and `NSDataReadingMappedAlways` doesn't always (despite the name) create memory mapped instances. Described in detail at [CIMGF](http://www.cimgf.com/2012/02/17/extending-nsdata-and-not-overriding-dealloc/).
 
+* `fixpng.sh`: Two shell functions useful for converting iOS-optimized PNGs back into standard PNGs. These functions rely on the `xcrun` command-line tool and probably require that Xcode 4.3 or higher be installed.
+
 # Important note
 
-All code in this repository is designed for use with automated reference counting (ARC). If you are not using ARC you may experience memory leaks or worse.
+All Objective-C code in this repository is designed for use with automated reference counting (ARC). If you are not using ARC you may experience memory leaks or worse.
diff --git a/fixpng.sh b/fixpng.sh
new file mode 100644
index 0000000..3c915bd
--- /dev/null
+++ b/fixpng.sh
@@ -0,0 +1,40 @@
+# Fix an iOS-converted PNG
+# By Tom Harrington, June 1 2012.
+
+fixpng () {
+	if [ -z "$1" ]; then
+		echo "Usage: fixpng <inputFile> [outputFile]"
+		return -1
+	else
+		inputFile=$1
+		
+		# Only "png" and "PNG" are allowed
+		pngRegex='.*.(png|PNG)$'
+		if [[ $inputFile =~ $pngRegex ]]; then
+			if [ -n "$2" ]; then
+				# Use whatever name was provided
+				outputFile=$2
+			else
+				# Generate a filename, preserve file extension case.
+				extension=${BASH_REMATCH[1]}
+				outputFile=${inputFile%.$extension}-fixed.$extension
+			fi
+			echo "Converting $inputFile to $outputFile"
+			
+			xcrun -sdk iphoneos pngcrush -q -revert-iphone-optimizations $inputFile $outputFile
+		else
+			echo "Skipping $inputFile since it's not a png"
+		fi
+	fi
+}
+
+# Fix a whole mess of pngs at once
+fixpngs () {
+	if [ -z "$1" ]; then
+		echo "Usage: fixpng <inputFiles> [outputFile]"
+		return -1
+	else
+		for file in "$@"; do fixpng $file; done
+	fi
+
+}