libpng

Library for manipulating PNG images
http://www.libpng.org/pub/png/libpng.html

Current versions
1.6.34
HEAD

libpng requires the following formula to be installed:
xz 5.2.3 General-purpose data compression with high compression ratio

Reverse dependencies

The following formulae require libpng to be installed:
fox 1.6.51 Toolkit for developing Graphical User Interfaces easily.
grace 5.1.25
atpdec 1.7
php55 5.5.38_12 PHP Version 5.5
php53 5.3.29_8 PHP Version 5.3
php54 5.4.45_7 PHP Version 5.4
sdl_image 1.2.12_7 Image file loading library
imlib2 1.4.10_1 Image loading and rendering library
fig2dev 3.2.6a_1 Translates figures generated by xfig to other formats
libkate 0.4.1_1 Overlay codec for multiplexed audio/video in Ogg
libsvg-cairo 0.1.6_2 SVG rendering library using Cairo
ufraw 0.22_2 Unidentified Flying RAW: RAW image processing utility
mozjpeg 3.2 Improved JPEG encoder
libbpg 0.9.7_1 Image format meant to improve on JPEG quality and file size
librasterlite 1.1g_3 Library to store and retrieve huge raster coverages
grace 5.1.25_2 WYSIWYG 2D plotting tool for X11
guetzli 1.0.1 Perceptual JPEG encoder
scale2x 3.1 Real-time graphics effect
stella 5.0.2 Atari 2600 VCS emulator
dvdauthor 0.7.2 DVD-authoring toolset
qrencode 4.0.0 QR Code generation
png++ 0.2.5_1 C++ wrapper for libpng library
pngnq 1.1_1 Tool for optimizing PNG images
podofo 0.9.5_1 Library to work with the PDF file format
neopop-sdl 0.2 NeoGeo Pocket emulator
openslide 3.4.1_3 C library to read whole-slide images (a.k.a. virtual slides)
imageworsener 1.3.2_1 Utility and library for image scaling and processing
fs-uae 2.8.3 Amiga emulator
xu4 1.0beta4+r3088 Remake of Ultima IV
teem 1.11.0 Libraries for scientific raster data
openmsx 0.14.0 MSX emulator
dosbox-x 0.801_1 DOSBox with accurate emulation and wide testing
mupen64plus 2.5 Cross-platform plugin-based N64 emulator
ffmpegthumbnailer 2.2.0_1 Create thumbnails for your video files
webalizer 2.23-08_1 Web server log file analysis
logstalgia 1.1.0 Web server access log visualizer with retro style
blat 36 Genomic sequence search tool
visp 3.0.1_4 Visual Servoing Platform library
devil 1.8.0_1 Cross-platform image library
jbig2dec 0.14 JBIG2 decoder and library (for monochrome documents)
libagar 1.5.0_1 Cross-platform GUI toolkit
nagios 4.3.4 Network monitoring and management system
nazghul 0.7.1 Computer role-playing game engine
openjpeg 2.3.0 Library for JPEG-2000 image manipulation
openrct2 0.1.1 Open source re-implementation of RollerCoaster Tycoon 2
ploticus 2.42_1 Scriptable plotting and graphing utility
rgbds 0.3.3 Rednex GameBoy Development System
synfig 1.0.2_2 Command-line renderer
rlvm 0.14_3 RealLive interpreter for VisualArts games
apng2gif 1.8 Convert APNG animations into animated GIF format
gif2png 2.5.11 Convert GIFs to PNGs
htmldoc 1.9.1 Convert HTML to PDF or PostScript
zint 2.6.2 Barcode encoding library supporting over 50 symbologies
mapserver 7.0.7 Publish spatial data and interactive mapping apps to the web
swfmill 0.3.6 xml2swf and swf2xml processor
dcmtk 3.6.2 OFFIS DICOM toolkit command-line utilities
simutrans 120.1.3 Transport simulator
mono-libgdiplus 5.6 GDI+-compatible API on non-Windows operating systems
webp 0.6.1 Image format providing lossless and lossy compression for web images
ucsc-genome-browser 338 Mirror of the UCSC Genome Browser
ome-files 0.5.0 Open Microscopy Environment (OME) File scientific image I/O library
pioneer 20171001_1 Game of lonely space adventure
fuse-emulator 1.5.0 Free Unix Spectrum Emulator
gegl 0.3.26 Graph based image processing framework
sile 0.9.5-alpha_3 Modern typesetting system inspired by TeX
gource 0.47 Version Control Visualization Tool
mapcrafter 2.4_2 Minecraft map renderer
enigma 1.21_3 Puzzle game inspired by Oxyd and Rock'n'Roll
enblend-enfuse 4.2_3 Combines images that overlap
dlib 19.8 C++ library for machine learning
astrometry-net 0.73 Automatic identification of astronomical images
insighttoolkit 4.13.0 ITK is a toolkit for performing registration and segmentation
sumo 0.32.0 Simulation of Urban Mobility
fontforge 20170731_2 Command-line outline and bitmap font editor/converter
ttfautohint 1.8.1 Auto-hinter for TrueType fonts
visp 3.1.0 Visual Servoing Platform library
blastem 0.5.1 Fast and accurate Genesis emulator
php70 7.0.27_19 PHP Version 7.0
grib-api 1.25.0 Encode and decode grib messages (editions 1 and 2)
povray 3.7.0.7 Persistence Of Vision RAYtracer (POVRAY)
php56 5.6.33_9 PHP Version 5.6
freetype 2.9 Software library to render fonts
vtk 8.1.0 Toolkit for 3D computer graphics, image processing, and visualization
lensfun 0.3.2_2 Remove defects from digital images
taisei 1.1.2_1 Clone of Touhou Project shoot-em-up games
gdal 1.11.5_3 Geospatial Data Abstraction Library
scummvm 2.0.0 Graphic adventure game interpreter
fox 1.6.56 Toolkit for developing Graphical User Interfaces easily

Recent formula history

ilovezfs Use “squiggly” heredocs.
Viktor Szakats libpng: secure url(s)
ilovezfs libpng 1.6.34
ilovezfs libpng 1.6.32
ilovezfs libpng 1.6.31

Formula code at GitHub