Add fixpng.sh for convenient fixing of iOS-optimized PNGs.

README.md

@@ -1,13 +1,15 @@
 # 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/).
 
 * `NSObject+deallocBlock.h`: Add a block to any object that will execute when that object is deallocated. Described in detail at [CIMGF](http://www.cimgf.com/2012/02/17/extending-nsdata-and-not-overriding-dealloc/).
 
 * `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.

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
+
+}