R Observatory: Metrics for fastpng version 0.1.9

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

fastpng

0.1.9Package record

Read and Write PNG Files with Configurable Decoder/Encoder Options

0packages dependsuggested by 1

3.4Kdownloads / year

50.9%test coverage

13/13flavors OK

Overview

About

Maintained by Mike ChengCRAN page ↗GitHub ↗Issues ↗

Read and write PNG images with arrays, rasters, native rasters, numeric arrays, integer arrays, raw vectors and indexed values. This PNG encoder exposes configurable internal options enabling the user to select a speed-size tradeoff. For example, disabling compression can speed up writing PNG by a factor of 50. Multiple image formats are supported including raster, native rasters, and integer and numeric arrays at color depths of 1, 2, 3 or 4. 16-bit images are also supported. This implementation uses the 'libspng' 'C' library which is available from https://github.com/randy408/libspng/.

Changes in 0.1.9

Address rchk issues on CRAN

From NEWS.md in the release

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)

install.packages("fastpng", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("coolbutuseless/fastpng")

Development version from coolbutuseless/fastpng. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-fastpng

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-fastpng

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 2.5 min · r-devel-windows-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-07-19
WARNING12 OK, 1 WARNING2026-07-16
OK14 OK2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.1.9

README· In the repository, left out of the releaseVignettesYes · 1 · dynamicNEWSYes · 100% structured · mentions 0.1.9Citation fileNoWebsitenot declared in DESCRIPTION

Help pages: 6
Examples that run: 100%4 run in a plain check
Exported functions with examples: 80%
Documented parameters: 88%
Return-value docs: 80%
Help pages citing references: 0%

Vignettes (1)

Overview HTML

How these are measured

Downloads

3.4K

CRAN downloads in the past year

Rank #7,424 · ~9/day · ~281/mo

Releases R versions

Daily download trend is not available in this view yet.

63030 days

1.2K90 days

3.4K1 year

Compare downloads with other packages →

Also on400 r2u

How downloads are counted

Repository

coolbutuseless/fastpng ↗Account: coolbutuseless

20Stars

1Forks

2Open issues

0Open PRs

0Releases

103Commits

1Commit identities

103 commits · Last activity 2026-07-18 · 0% stars, 30d

Responsiveness

How these are sampled

PRs merged (all time): not measured
Median days to close, 50 most recently updated closed issues: 96
Median days to close, 50 most recently updated closed PRs: not measured

Stars over time

2025-06-12 · 182026-07-07 · 20

How these are measured

PracticesBeta

5 development-tooling and community-health practices detected across 3 families in the upstream repository

Checks run against github.com/coolbutuseless/fastpng on 2026-10-11.

Continuous integration (2)

GitHub ActionsR CMD check workflow

The R CMD check workflow runs on Linux, macOS and Windows, and on R-devel

Docs source (1)

README.Rmd

Reproducibility and dev environment (2)

data-raw/Dev Container

How this is detected·Detection ruleset v3 (2026-09-26)

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Installing fastpng adds 1 package (1 with compiled code, 38 KB of source tarballs). Heaviest: colorfast 38 KB.

Depends (1)

R >= 4.1.0

Imports (1)

colorfast

LinkingTo (1)

colorfast

Suggests (4)

knitr png rmarkdown testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Suggested by 1

Suggests, most downloaded first

nara

How these are counted

Code & Tests

Datasets

People & History

People (13)

Mike Cheng

Author, Maintainer since 0.1.5 (2024), Copyright holder

Randy408

Author, Copyright holder

Author of bundled libspng

The PNG Reference Library Authors

Author, Copyright holder

Mike Klein

Contributor

SSE2 optimised filter functions

Mars Rullgard

Contributor

NEON optimised filter functions

Matt Sarett

Contributor

SSE2 optimised filter functions

Richard Townsend

Contributor

NEON optimised palette expansion functions

James Yu

Contributor

NEON optimised filter functions

Arm Holdings

Copyright holder

NEON optimised palette expansion functions

Andreas Dilger

Copyright holder

Glenn Randers-Pehrson

Copyright holder

SSE2 optimised filter functions

Guy Eric Schalnat

Copyright holder

Cosmin Truta

Copyright holder

SSE2 optimised filter functions, NEON optimised filter functions, NEON optimised palette expansion functions

Releases (4)

Pick two releases to compare their code metrics.

0.1.9Latest
record
2026-07-18 · current release · diff ↗
R
R 4.6.0 released · 2026-04-24
0.1.8
record
2026-02-27 · diff ↗
R
R 4.5.0 released · 2025-04-11
0.1.7
record
2025-01-14 · diff ↗
0.1.5
record
2024-09-04
R
R 4.4.0 released · 2024-04-24

Package metadata

First published: 2024-09-04
Total releases: 4 / 2 yrs
License: MIT + file LICENSE OSI
Copyright: The included 'libspng' code is Copyright (c) 2018-2023, Randy <randy408@protonmail.com>. Sections within the 'libspng' code are derived from 'libpng' and copyright attributed to those authors. See 'COPYRIGHTS' for license information and full attribution of all copyrighted sections of code.
Minimum R: ≥ 4.1.0
Bundled data: 2.2 MB / 1 file
Download size: 2.8 MB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("fastpng")

Format

Cheng, M., Arm Holdings, Randy408, The PNG Reference Library Authors, Dilger, A., Klein, M., Randers-Pehrson, G., Rullgard, M., Sarett, M., Schalnat, G. E., Townsend, R., Truta, C., & Yu, J. (2026). fastpng: Read and Write PNG Files with Configurable Decoder/Encoder Options (Version 0.1.9) [Computer software]. https://doi.org/10.32614/CRAN.package.fastpng

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for fastpng version 0.1.9 [Data set]. HJJB, LLC. Data release v2026-10-18. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-18, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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