README
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iOS PNG File Normalizer
This package reverts optimizations that are done by Xcode for PNG files when packaging iOS apps:
- Removes CgBI chunks
- Fixes compressed IDAT chunks
- removes alpha pre-multiply
The package does similar things like ipin.py or xcrun -sdk iphoneos pngcrush -revert-iphone-optimizations
Installation
The import path for the package is github.com/andrianbdn/iospng.
To install it, run:
go get github.com/andrianbdn/iospng
Usage
func PngRevertOptimizationWithSize
func PngRevertOptimizationWithSize(reader io.Reader, writer io.Writer) (int, int, error)
This function actually does everything: reads PNG from reader and in case it is iOS-optimized, reverts optimization. Function does not change data if PNG does not have CgBI chunk.
First two return parameters (ints) are PNG width and height.
func PngRevertOptimization
func PngRevertOptimization(reader io.Reader, writer io.Writer) error
Old-style function that does not return size also available.
See also
Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
var ( ErrPngHeader = errors.New("Not a Png") ErrImageData = errors.New("Unexpected amount of image data") )
Functions ¶
func PngRevertOptimization ¶
old, compatible version
func PngRevertOptimizationWithSize ¶
This function actually does everything: reads PNG from reader and in case it is iOS-optimized, reverts optimization.
Function does not change data if PNG does not have CgBI chunk.
Types ¶
This section is empty.
Source Files
Directories