tinf
fpnge
tinf | fpnge | |
---|---|---|
3 | 4 | |
142 | 79 | |
- | - | |
10.0 | 4.2 | |
over 1 year ago | about 2 months ago | |
C | C++ | |
zlib License | Apache License 2.0 |
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tinf
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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
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EzGz - An easy to use single header no dependency library for decompression of .gz archives written in modern C++ (probably faster than zlib)
Right now I'm using a C library (https://github.com/jibsen/tinf) due to size constraints. Adding a few hundred kB is prohibitive in that space.
fpnge
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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!
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Hello, PNG
But most platforms these days have some form of CRC32 "acceleration". Adler32 is easy to compute so I'm even less concerned there.
I spent a bunch of time optimising the code in [fpnge](https://github.com/veluca93/fpnge), which is [often notably faster than fpng](https://github.com/nigeltao/qoir/blob/5671f584dcf84ddb71e28d...), yet checksum time is basically negligible.
Having said that, the double-checksum aspect of PNG does feel unnecessary.
- Computing Adler32 Checksums at 41 GB/s
- QOI – The Quite OK Image Format
What are some alternatives?
Stm32-FatFs-Gzip - This project offers a simplified compressor that produces Gzip-compatible output with small resources for microcontrollers and edge computers. He uses the very basic LZ77 compression algorithm and static Deflate Huffman tree encoding to compress / decompress data into Gzip files.
fpng - Super fast C++ .PNG writer/reader
figlet-fonts - my collection of figlet / toilet ascii art fonts
zpaqlpy - Compiles a zpaqlpy source file (a Python-subset) to a ZPAQ configuration file for usage with zpaqd
canvas_ity - A tiny, single-header <canvas>-like 2D rasterizer for C++
php-qoi - QOI image encoder and decoder written in pure PHP
libpng - LIBPNG: Portable Network Graphics support, official libpng repository
UNITS - a compile-time, header-only, dimensional analysis and unit conversion library built on c++14 with no dependencies.
zlib-ng - zlib replacement with optimizations for "next generation" systems.