Simple read/write PPM files (P3/P6) in Swift (macOS, iOS, tvOS, watchOS, macCatalyst, Linux).
Read a PPM file
Load a PPM file as a CGImage
let ppmData = Data(...) let cgImage = try PPM.readImage(data: ppmData)
Load raw PPM image data from a file
let imageData: PPM.ImageData = try PPM.read(fileURL: ppm1URL) // width = imageData.width // height = imageData.height // rawRGBBytes = imageData.data
Write a PPM file
Write a CGImage to a PPM file
NOTE: PPM doesn't support transparency, so any transparency information is lost.
let cgImage = CGImage(...) let data = try PPM.writeImage(cgImage, format: .P3)
Write raw RGB data to a PPM file
let imageData = PPM.ImageData(...) try imageData.write(format: .P3, fileURL: <some_url>)
- Linux only supports very naive color conversions between RGB-CMYK-Gray.
To build/test linux support using a mac
- Install Docker Desktop for Mac on your mac
- Make sure that docker is running (or else the next command will fail with a weird or no error message)
- Run the following command in the directory you want to mirror in your linux
docker run --rm --privileged --interactive --tty --volume "$(pwd):/src" --workdir "/src" swift:latest
Now, from within the docker container, run
swift build swift test
Note that the /src directory in the Linux container is a direct mirror of the current directory on the host OS, not a copy. If you delete a file in /src in the Linux container, that file will be gone on the host OS, too.
MIT License Copyright (c) 2022 Darren Ford Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.