pics
fpng
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
pics
- Hello, PNG
-
can’t be the only one
Using this framework, you can started with some excercises or dig into some file formats if you want something different (many file format have segments with variable length so the header will provide either offset or length which makes a good execercise for understanding pointer arithmetic).
- Binary Posters
-
How to generate an object file (and later an exe) from assembly
And this is not official, but you'll probably like it: https://github.com/corkami/pics/tree/master/binary/pe101
-
An MP4 file first draft
Author's github: https://github.com/corkami/pics
He works on things like hash collisions, image files that contain an image of their own hash, "polyglot" files and such like.
I think this is intended as a "minimum viable mp4 file" to show what the required binary parts are.
- Computing Posters
- ELF 101 a Linux Executable Walkthrough by Ange Albertini [pdf]
-
Fantastic Symbols and Where to Find Them - Part 1
ELF Executable and Linkable Format diagram by Ange Albertini
fpng
-
png crate gets an ultrafast compression mode, up to 4x faster decompression
When the QOI format was first announced it wasn't clear that was even possible while keeping PNG format compatibility. But the fpng and fpnge C/C++ libraries showed it was, and today you can take advantage of those advances in a general purpose PNG library in Rust!
-
Hello, PNG
CRC is a table and 5 lines of code. That's trivial.
>zlib is 23k lines
It's not needed to make a PNG reader/writer. zlib is massive overkill for only making a PNG reader or writer. Here's a tiny deflate/inflate code [2] under 1k lines (and could be much smaller if needed).
stb[0] has single headers of ~7k lines total including all of the formats PNG, JPG, BMP,. PSD, GIF, HDR, and PIC. Here's [1] a 3k lines single file PNG version with tons if #ifdefs for all sorts of platforms. Removing those and I'd not be surprised if you could not do it in ~1k lines (which I'd consider quite simple compared to most of todays' media formats).
>Of course they're not common formats so you're stuck with complex formats like PNG
BMP is super common and easy to use anywhere.
I use flat image files all the time for quick and dirty stuff. They quickly saturate disk speeds and networking speeds (say recording a few decent speed cameras), and I've found PNG compression to alleviate those saturate CPU speeds (some libs are super slow, some are vastly faster). I've many times made custom compression formats to balance these for high performance tools when neither things like BMPs or things like PNG would suffice.
[0] https://github.com/nothings/stb
[1] https://github.com/richgel999/fpng/blob/main/src/fpng.cpp
[2] https://github.com/jibsen/tinf/tree/master/src
- Quite OK Image is now my favorite asset format
-
Computing Adler32 Checksums at 41 GB/s
This was actually considered, and other libraries do ignore checksums, or at least have options to:
https://github.com/richgel999/fpng/issues/9
-
QOI – The Quite OK Image Format
In the other direction, you can target a subset of PNG to get less optimized images but with QOI-like encode and decode speed: https://github.com/richgel999/fpng
-
ReShade 5.0 Released!
On specific operations like screenshots for example the new version is WAY faster though. We were using stb_image_write.h but switched to fpng which promised 12-19x faster compression at smaller sizes. That and the fact that screenshot saving have now been given it's own thread so it now longer causes a small stutter like when it was on the main thread, means that screenshot are now near instantaneous.
-
QOI – The “Quite OK Image Format” for fast, lossless image compression
I think QOI inspired the creation of https://github.com/richgel999/fpng which creates standard PNGs and compares itself directly to QOI.
-
Losslessly compresses RGB and RGBA images to a similar size of PNG, while offering a 20x-50x speedup in compression and 3x-4x speedup in decompression
BTW, today I found this fpng-fast PNG writer. There is a comparison with QOI in the readme.
What are some alternatives?
pdftilecut - pdftilecut lets you sub-divide a PDF page(s) into smaller pages so you can print them on small form printers.
qoi - The “Quite OK Image Format” for fast, lossless image compression
Plex-Movie-Poster-Display - Scraps the Plex sessions page to display the current playing movie or TV show poster on a screen.
fpnge - Demo of a fast PNG encoder.
parca-agent - eBPF based always-on profiler auto-discovering targets in Kubernetes and systemd, zero code changes or restarts needed!
libdeflate - Heavily optimized library for DEFLATE/zlib/gzip compression and decompression
MP4Inspector - A Chrome extension to help you inspect Mp4 video content and find irregularities in video streams.
oss-nvjpg - Hardware-accelerated JPEG decoding on the Nvidia Tegra X1
GpxTrackPoster - Create a visually appealing poster from your GPX tracks
PNG-spec - Maintenance of the PNG specification
basis_universal - Basis Universal GPU Texture Codec
php-qoi - QOI image encoder and decoder written in pure PHP