文件列表:

LICENSE (16725, 2022-06-06)
qoi-test/ (0, 2022-06-06)
qoi-test/compare.sh (414, 2022-06-06)
qoi-test/hexdump.sh (54, 2022-06-06)
qoi-test/qoi_test_images.out/ (0, 2022-06-06)
qoi-test/reader-tests.rkt (1451, 2022-06-06)
qoi-test/setup.sh (626, 2022-06-06)
qoi-test/writer-tests.rkt (1246, 2022-06-06)
qoi/ (0, 2022-06-06)
qoi/info.rkt (312, 2022-06-06)
qoi/lib/ (0, 2022-06-06)
qoi/lib/image.rkt (1193, 2022-06-06)
qoi/lib/qoi-defs.rkt (1850, 2022-06-06)
qoi/lib/reader.rkt (3620, 2022-06-06)
qoi/lib/writer.rkt (3575, 2022-06-06)
qoi/main.rkt (398, 2022-06-06)

Quite OK Image format encoder and decoder in Racket === This repository contains a [Racket](https://racket-lang.org/) implementation of an encoder and a decoder for the [QOI image format](https://qoiformat.org/). At the moment, this implementation can only convert raw RGBA images to/from QOI. Other image formats can be handled by separate image manipulation tools or libraries. Credits ------- Thanks to Matthias Felleisen for reviewing and improving the code. Installation ------------ Install [Racket](https://racket-lang.org/). Run these commands to clone this repository and install the `qoi` library: ``` git clone https://github.com/aumouvantsillage/qoi-racket.git cd qoi-racket/qoi raco pkg install --auto ``` Examples -------- Install [ImageMagick](https://imagemagick.org/). Run this script to get the official test image set and convert the PNG files to RGBA: ``` cd qoi-racket/qoi-test ./setup.sh ``` ### QOI encoding Run this script to convert all test images `qoi_test_images/*.rgba` to `qoi_test_images.out/*.qoi`: ``` racket writer-tests.rkt ``` ### QOI decoding Run this script to convert all test images `qoi_test_images/*.qoi` to `qoi_test_images.out/*.rgba`: ``` racket reader-tests.rkt ``` API --- ```racket (struct image (width height channels colorspace pixels)) ``` Structure type for images. Use `make-image` to create a new image instance. * `width`: image width, in pixels. * `height`: image height, in pixels. * `channels`: 3=RGB, 4=RGBA. * `colorspace`: 0=sRGB with linear alpha, 1=all channels linear. * `pixels`: a mutable [byte string](https://docs.racket-lang.org/reference/bytestrings.html) with RGBA pixel values (one byte per channel). ```racket (make-image width height channels colorspace) ``` Creates and returns a new instance of the `image` structure type. ```racket (image-read-rgba width height channels colorspace [in (current-input-port)]) ``` Creates and returns a new instance of the `image` structure type. Its `pixels` field is filled with RGBA data from the input port `in`. ```racket (image-write-rgba img [out (current-output-port)]) ``` Write the RGBA data of the image `img` to the output port `out`. ```racket (image-read-qoi [in (current-input-port)]) ``` Creates and returns a new instance of the `image` structure type. This function reads and decodes QOI data from the input port `in` and fills the `pixels` field of the image with the decoded RGBA data. ```racket (image-write-qoi img [out (current-output-port)]) ``` Encode the RGBA data of the image `img` to the QOI format and write the result to the output port `out`.

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