Initial
This commit is contained in:
Dominic Szablewski
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.gitignore
vendored
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.gitignore
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images/
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README.md
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README.md
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# QOI - The “Quite OK Image” format for fast, lossless image compression
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Single-file MIT licensed library for C/C++
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See [qoi.h](https://github.com/phoboslab/qoi/blob/master/qoi.h) for
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the documentation.
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More info at https://phoboslab.org/log/2021/11/qoi-fast-lossless-image-compression
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## Why?
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Compared to stb_image and stb_image_write QOI offers 20x-50x faster encoding,
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3x-4x faster decoding and 20% better compression. It's also stupidly simple and
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fits in about 300 lines of C.
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## Example Usage
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- [qoiconv.c](https://github.com/phoboslab/qoi/blob/master/qoiconv.c)
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converts between png <> qoi
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- [qoibench.c](https://github.com/phoboslab/qoi/blob/master/qoibench.c)
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a simple wrapper to benchmark stbi, libpng and qoi
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509
qoi.h
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qoi.h
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/*
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QOI - The “Quite OK Image” format for fast, lossless image compression
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Dominic Szablewski - https://phoboslab.org
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-- LICENSE: The MIT License(MIT)
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Copyright(c) 2021 Dominic Szablewski
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files(the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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-- About
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QOI encodes and decodes images in a lossless format. An encoded QOI image is
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usually around 10--30% larger than a decently optimized PNG image.
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QOI outperforms simpler PNG encoders in compression ratio and performance. QOI
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images are typically 20% smaller than PNGs written with stbi_image but 10%
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larger than with libpng. Encoding is 25-50x faster and decoding is 3-4x faster
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than stbi_image or libpng.
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-- Synopsis
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// Define `QOI_IMPLEMENTATION` in *one* C/C++ file before including this
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// library to create the implementation.
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#define QOI_IMPLEMENTATION
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#include "qoi.h"
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// Load and decode a QOI image from the file system into a 32bbp RGBA buffer
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int width, height;
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void *rgba_pixels = qoi_read("image.qoi", &width, &height, 4);
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// Encode and store an RGBA buffer to the file system
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qoi_write("image_new.qoi", rgba_pixels, width, height, 4);
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-- Documentation
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This library provides the following functions;
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- qoi_read -- read and decode a QOI file
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- qoi_decode -- decode the raw bytes of a QOI image from memory
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- qoi_write -- encode and write a QOI file
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- qoi_encode -- encode an rgba buffer into a QOI image in memory
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See the function declaration below for the signature and more information.
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If you don't want/need the qoi_read and qoi_write functions, you can define
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QOI_NO_STDIO before including this library.
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This library uses malloc() and free(). To supply your own malloc implementation
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you can define QOI_MALLOC and QOI_FREE before including this library.
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-- Data Format
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A QOI file has the following header, followed by any number of data "chunks".
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struct qoi_header_t {
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char [4]; // magic bytes "qoif"
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unsigned short width; // image width in pixels
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unsigned short height; // image height in pixels
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unsigned int size; // number of data bytes following this header
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};
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The decoder and encoder start with {r: 0, g: 0, b: 0, a: 255} as the previous
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pixel value. Pixels are either encoded as
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- a run of the previous pixel
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- an index into a previously seen pixel
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- a difference to the previous pixel value in r,g,b,a
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- full r,g,b,a values
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A running array[64] of previously seen pixel values is maintained by the encoder
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and decoder. Each pixel that is seen by the encoder and decoder is put into this
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array at the position (r^g^b^a) % 64. In the encoder, if the pixel value at this
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index matches the current pixel, this index position is written to the stream.
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Each chunk starts with a 2, 3 or 4 bit tag, followed by a number of data bits.
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The bit length of chunks is divisible by 8 - i.e. all chunks are byte aligned.
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QOI_INDEX {
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u8 tag : 2; // b00
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u8 idx : 6; // 6-bit index into the color index array: 0..63
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}
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QOI_RUN_8 {
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u8 tag : 3; // b010
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u8 run : 5; // 5-bit run-length repeating the previous pixel: 1..32
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}
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QOI_RUN16 {
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u8 tag : 3; // b011
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u16 run : 13; // 13-bit run-length repeating the previous pixel: 33..8224
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}
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QOI_DIFF8 {
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u8 tag : 2; // b10
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u8 dr : 2; // 2-bit red channel difference: -1..2
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u8 dg : 2; // 2-bit green channel difference: -1..2
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u8 db : 2; // 2-bit blue channel difference: -1..2
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}
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QOI_DIFF16 {
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u8 tag : 3; // b110
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u8 dr : 5; // 5-bit red channel difference: -15..16
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u8 dg : 4; // 4-bit green channel difference: -7.. 8
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u8 db : 4; // 4-bit blue channel difference: -7.. 8
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}
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QOI_DIFF24 {
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u8 tag : 4; // b1110
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u8 dr : 5; // 5-bit red channel difference: -15..16
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u8 dg : 5; // 5-bit green channel difference: -15..16
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u8 db : 5; // 5-bit blue channel difference: -15..16
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u8 da : 5; // 5-bit alpha channel difference: -15..16
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}
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QOI_COLOR {
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u8 tag : 4; // b1111
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u8 has_r: 1; // red byte follows
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u8 has_g: 1; // green byte follows
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u8 has_b: 1; // blue byte follows
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u8 has_a: 1; // alpha byte follows
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u8 r; // red value if has_r == 1: 0..255
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u8 g; // green value if has_g == 1: 0..255
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u8 b; // blue value if has_b == 1: 0..255
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u8 a; // alpha value if has_a == 1: 0..255
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}
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*/
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// -----------------------------------------------------------------------------
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// Header - Public functions
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#ifndef QOI_H
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#define QOI_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef QOI_NO_STDIO
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// Encode raw RGB or RGBA pixels into a QOI image write it to the file system.
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// w and h denote the the width and height of the pixel data. channels must be
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// either 3 for RGB data or 4 for RGBA.
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// The function returns 0 on failure (invalid parameters, or fopen or malloc
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// failed) or the number of bytes written on success.
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int qoi_write(const char *filename, const void *data, int w, int h, int channels);
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// Read and decode a QOI image from the file system into either raw RGB
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// (channels=3) or RGBA (channels=4) pixel data.
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// The function either returns NULL on failure (invalid data, or malloc or fopen
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// failed) or a pointer to the decoded pixels. On success out_w and out_h will
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// be set to the width and height of the decoded image.
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// The returned pixel data should be free()d after use.
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void *qoi_read(const char *filename, int *out_w, int *out_h, int channels);
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#endif // QOI_NO_STDIO
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// Encode raw RGB or RGBA pixels into a QOI image in memory. w and h denote the
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// width and height of the pixel data. channels must be either 3 for RGB data
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// or 4 for RGBA.
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// The function either returns NULL on failure (invalid parameters or malloc
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// failed) or a pointer to the encoded data on success. On success the out_len
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// is set to the size in bytes of the encoded data.
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// The returned qoi data should be free()d after user.
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void *qoi_encode(const void *data, int w, int h, int channels, int *out_len);
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// Decode a QOI image from memory into either raw RGB (channels=3) or RGBA
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// (channels=4) pixel data.
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// The function either returns NULL on failure (invalid parameters or malloc
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// failed) or a pointer to the decoded pixels. On success out_w and out_h will
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// be set to the width and height of the decoded image.
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// The returned pixel data should be free()d after use.
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void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channels);
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#ifdef __cplusplus
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}
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#endif
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#endif // QOI_H
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// -----------------------------------------------------------------------------
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// Implementation
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#ifdef QOI_IMPLEMENTATION
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#include <stdlib.h>
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#ifndef QOI_MALLOC
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#define QOI_MALLOC(sz) malloc(sz)
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#define QOI_FREE(p) free(p)
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#endif
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#define QOI_INDEX 0x00 // 00xxxxxx
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#define QOI_RUN_8 0x40 // 010xxxxx
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#define QOI_RUN_16 0x60 // 011xxxxx
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#define QOI_DIFF_8 0x80 // 10xxxxxx
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#define QOI_DIFF_16 0xc0 // 110xxxxx
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#define QOI_DIFF_24 0xe0 // 1110xxxx
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#define QOI_COLOR 0xf0 // 1111xxxx
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#define QOI_MASK_2 0xc0 // 11000000
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#define QOI_MASK_3 0xe0 // 11100000
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#define QOI_MASK_4 0xf0 // 11110000
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#define QOI_COLOR_HASH(C) (C.rgba.r ^ C.rgba.g ^ C.rgba.b ^ C.rgba.a)
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typedef union {
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struct { unsigned char r, g, b, a; } rgba;
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unsigned int v;
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} qoi_rgba_t;
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typedef union {
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char chars[4];
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unsigned int v;
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} qoi_magic_t;
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typedef struct {
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qoi_magic_t magic;
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unsigned short width;
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unsigned short height;
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unsigned int size;
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} qoi_header_t;
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const static qoi_magic_t qoi_magic = {.chars = {'q','o','i','f'}};
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void *qoi_encode(const void *data, int w, int h, int channels, int *out_len) {
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if (
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data == NULL || out_len == NULL ||
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w <= 0 || w >= (1 << 16) ||
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h <= 0 || h >= (1 << 16) ||
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channels < 3 || channels > 4
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) {
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return NULL;
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}
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int max_size = w * h * (channels + 1) + sizeof(qoi_header_t) + 4;
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int p = 0;
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unsigned char *bytes = QOI_MALLOC(max_size);
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if (!bytes) {
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return NULL;
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}
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*(qoi_header_t *)bytes = (qoi_header_t) {
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.magic = qoi_magic,
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.width = w,
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.height = h,
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.size = 0 // will be set at the end
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};
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p += sizeof(qoi_header_t);
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const unsigned char *pixels = (const unsigned char *)data;
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qoi_rgba_t index[64] = {0};
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int run = 0;
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qoi_rgba_t px_prev = {.rgba = {.r = 0, .g = 0, .b = 0, .a = 255}};
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qoi_rgba_t px = px_prev;
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int px_len = w * h * channels;
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int px_end = px_len - channels;
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for (int px_pos = 0; px_pos < px_len; px_pos += channels) {
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if (channels == 4) {
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px = *(qoi_rgba_t *)(pixels + px_pos);
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}
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else {
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px.rgba.r = pixels[px_pos];
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px.rgba.g = pixels[px_pos+1];
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px.rgba.b = pixels[px_pos+2];
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}
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if (px.v == px_prev.v) {
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run++;
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}
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if (run > 0 && (run == 0x2020 || px.v != px_prev.v || px_pos == px_end)) {
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if (run < 33) {
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run -= 1;
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bytes[p++] = QOI_RUN_8 | run;
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}
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else {
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run -= 33;
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bytes[p++] = QOI_RUN_16 | run >> 8;
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bytes[p++] = run;
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}
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run = 0;
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}
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if (px.v != px_prev.v) {
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int index_pos = QOI_COLOR_HASH(px) % 64;
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if (index[index_pos].v == px.v) {
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bytes[p++] = QOI_INDEX | index_pos;
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}
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else {
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index[index_pos] = px;
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int vr = px.rgba.r - px_prev.rgba.r;
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int vg = px.rgba.g - px_prev.rgba.g;
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int vb = px.rgba.b - px_prev.rgba.b;
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int va = px.rgba.a - px_prev.rgba.a;
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if (
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vr > -16 && vr < 17 && vg > -16 && vg < 17 &&
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vb > -16 && vb < 17 && va > -16 && va < 17
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) {
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if (
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va == 0 && vr > -2 && vr < 3 &&
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vg > -2 && vg < 3 && vb > -2 && vb < 3
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) {
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bytes[p++] = QOI_DIFF_8 | ((vr + 1) << 4) | (vg + 1) << 2 | (vb + 1);
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}
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else if (
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va == 0 && vr > -16 && vr < 17 &&
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vg > -8 && vg < 9 && vb > -8 && vb < 9
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) {
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bytes[p++] = QOI_DIFF_16 | (vr + 15);
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bytes[p++] = ((vg + 7) << 4) | (vb + 7);
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}
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else {
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bytes[p++] = QOI_DIFF_24 | ((vr + 15) >> 1);
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bytes[p++] = ((vr + 15) << 7) | ((vg + 15) << 2) | ((vb + 15) >> 3);
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bytes[p++] = ((vb + 15) << 5) | (va + 15);
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}
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}
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else {
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bytes[p++] = QOI_COLOR | (vr?8:0)|(vg?4:0)|(vb?2:0)|(va?1:0);
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if (vr) { bytes[p++] = px.rgba.r; }
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if (vg) { bytes[p++] = px.rgba.g; }
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if (vb) { bytes[p++] = px.rgba.b; }
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if (va) { bytes[p++] = px.rgba.a; }
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}
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}
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}
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px_prev = px;
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}
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||||
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for (int i = 0; i < 4; i++) {
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bytes[p++] = 0;
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}
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((qoi_header_t *)bytes)->size = p - sizeof(qoi_header_t);
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*out_len = p;
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||||
return bytes;
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||||
}
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||||
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void *qoi_decode(const void *data, int size, int *out_w, int *out_h, int channels) {
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if (size < sizeof(qoi_header_t)) {
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return NULL;
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||||
}
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||||
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||||
qoi_header_t *header = (qoi_header_t *)data;
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if (
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channels < 3 || channels > 4 ||
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||||
!header->width || !header->height ||
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||||
header->size + sizeof(qoi_header_t) != size ||
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||||
header->magic.v != qoi_magic.v
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) {
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return NULL;
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}
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||||
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int px_len = header->width * header->height * channels;
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unsigned char *pixels = QOI_MALLOC(px_len);
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if (!pixels) {
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return NULL;
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||||
}
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||||
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||||
const unsigned char *bytes = (const unsigned char *)data + sizeof(qoi_header_t);
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||||
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||||
int data_len = header->size;
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||||
qoi_rgba_t px = {.rgba = {.r = 0, .g = 0, .b = 0, .a = 255}};
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||||
qoi_rgba_t index[64] = {0};
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||||
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int run = 0;
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||||
for (int px_pos = 0, p = 0; px_pos < px_len && p < data_len; px_pos += channels) {
|
||||
if (run > 0) {
|
||||
run--;
|
||||
}
|
||||
else {
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||||
int b1 = bytes[p++];
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||||
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||||
if ((b1 & QOI_MASK_2) == QOI_INDEX) {
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||||
px = index[b1 ^ QOI_INDEX];
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||||
}
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||||
else if ((b1 & QOI_MASK_3) == QOI_RUN_8) {
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||||
run = (b1 & 0x1f);
|
||||
}
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||||
else if ((b1 & QOI_MASK_3) == QOI_RUN_16) {
|
||||
int b2 = bytes[p++];
|
||||
run = (((b1 & 0x1f) << 8) | (b2)) + 32;
|
||||
}
|
||||
else if ((b1 & QOI_MASK_2) == QOI_DIFF_8) {
|
||||
px.rgba.r += ((b1 >> 4) & 0x03) - 1;
|
||||
px.rgba.g += ((b1 >> 2) & 0x03) - 1;
|
||||
px.rgba.b += ( b1 & 0x03) - 1;
|
||||
}
|
||||
else if ((b1 & QOI_MASK_3) == QOI_DIFF_16) {
|
||||
int b2 = bytes[p++];
|
||||
px.rgba.r += (b1 & 0x1f) - 15;
|
||||
px.rgba.g += (b2 >> 4) - 7;
|
||||
px.rgba.b += (b2 & 0x0f) - 7;
|
||||
}
|
||||
else if ((b1 & QOI_MASK_4) == QOI_DIFF_24) {
|
||||
int b2 = bytes[p++];
|
||||
int b3 = bytes[p++];
|
||||
px.rgba.r += (((b1 & 0x0f) << 1) | (b2 >> 7)) - 15;
|
||||
px.rgba.g += ((b2 & 0x7c) >> 2) - 15;
|
||||
px.rgba.b += (((b2 & 0x03) << 3) | ((b3 & 0xe0) >> 5)) - 15;
|
||||
px.rgba.a += (b3 & 0x1f) - 15;
|
||||
}
|
||||
else if ((b1 & QOI_MASK_4) == QOI_COLOR) {
|
||||
if (b1 & 8) { px.rgba.r = bytes[p++]; }
|
||||
if (b1 & 4) { px.rgba.g = bytes[p++]; }
|
||||
if (b1 & 2) { px.rgba.b = bytes[p++]; }
|
||||
if (b1 & 1) { px.rgba.a = bytes[p++]; }
|
||||
}
|
||||
|
||||
index[QOI_COLOR_HASH(px) % 64] = px;
|
||||
}
|
||||
|
||||
if (channels == 4) {
|
||||
*(qoi_rgba_t*)(pixels + px_pos) = px;
|
||||
}
|
||||
else {
|
||||
pixels[px_pos] = px.rgba.r;
|
||||
pixels[px_pos+1] = px.rgba.g;
|
||||
pixels[px_pos+2] = px.rgba.b;
|
||||
}
|
||||
}
|
||||
|
||||
*out_w = header->width;
|
||||
*out_h = header->height;
|
||||
return pixels;
|
||||
}
|
||||
|
||||
#ifndef QOI_NO_STDIO
|
||||
#include <stdio.h>
|
||||
|
||||
int qoi_write(const char *filename, const void *data, int w, int h, int channels) {
|
||||
int size;
|
||||
void *encoded = qoi_encode(data, w, h, channels, &size);
|
||||
if (!encoded) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
FILE *f = fopen(filename, "wb");
|
||||
if (!f) {
|
||||
QOI_FREE(encoded);
|
||||
return 0;
|
||||
}
|
||||
|
||||
fwrite(encoded, 1, size, f);
|
||||
fclose(f);
|
||||
QOI_FREE(encoded);
|
||||
return size;
|
||||
}
|
||||
|
||||
void *qoi_read(const char *filename, int *out_w, int *out_h, int channels) {
|
||||
FILE *f = fopen(filename, "rb");
|
||||
if (!f) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
fseek(f, 0, SEEK_END);
|
||||
int size = ftell(f);
|
||||
fseek(f, 0, SEEK_SET);
|
||||
|
||||
void *data = QOI_MALLOC(size);
|
||||
if (!data) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int bytes_read = fread(data, 1, size, f);
|
||||
fclose(f);
|
||||
|
||||
void *pixels = qoi_decode(data, bytes_read, out_w, out_h, channels);
|
||||
QOI_FREE(data);
|
||||
return pixels;
|
||||
}
|
||||
|
||||
#endif // QOI_NO_STDIO
|
||||
#endif // QOI_IMPLEMENTATION
|
||||
512
qoibench.c
Normal file
512
qoibench.c
Normal file
@ -0,0 +1,512 @@
|
||||
/*
|
||||
|
||||
Simple benchmark suite for png, stbi and qoi
|
||||
|
||||
Requires libpng, "stb_image.h" and "stb_image_write.h"
|
||||
Compile with:
|
||||
gcc qoibench.c -std=gnu99 -O3 -o qoibench
|
||||
|
||||
Dominic Szablewski - https://phoboslab.org
|
||||
|
||||
|
||||
-- LICENSE: The MIT License(MIT)
|
||||
|
||||
Copyright(c) 2021 Dominic Szablewski
|
||||
|
||||
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.
|
||||
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <dirent.h>
|
||||
#include <png.h>
|
||||
|
||||
#define STB_IMAGE_IMPLEMENTATION
|
||||
#define STBI_ONLY_PNG
|
||||
#define STBI_NO_LINEAR
|
||||
#include "stb_image.h"
|
||||
|
||||
#define STB_IMAGE_WRITE_IMPLEMENTATION
|
||||
#include "stb_image_write.h"
|
||||
|
||||
#define QOI_IMPLEMENTATION
|
||||
#include "qoi.h"
|
||||
|
||||
|
||||
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// Cross platform high resolution timer
|
||||
// From https://gist.github.com/ForeverZer0/0a4f80fc02b96e19380ebb7a3debbee5
|
||||
|
||||
#include <stdint.h>
|
||||
#if defined(__linux)
|
||||
#define HAVE_POSIX_TIMER
|
||||
#include <time.h>
|
||||
#ifdef CLOCK_MONOTONIC
|
||||
#define CLOCKID CLOCK_MONOTONIC
|
||||
#else
|
||||
#define CLOCKID CLOCK_REALTIME
|
||||
#endif
|
||||
#elif defined(__APPLE__)
|
||||
#define HAVE_MACH_TIMER
|
||||
#include <mach/mach_time.h>
|
||||
#elif defined(_WIN32)
|
||||
#define WIN32_LEAN_AND_MEAN
|
||||
#include <windows.h>
|
||||
#endif
|
||||
|
||||
static uint64_t ns() {
|
||||
static uint64_t is_init = 0;
|
||||
#if defined(__APPLE__)
|
||||
static mach_timebase_info_data_t info;
|
||||
if (0 == is_init) {
|
||||
mach_timebase_info(&info);
|
||||
is_init = 1;
|
||||
}
|
||||
uint64_t now;
|
||||
now = mach_absolute_time();
|
||||
now *= info.numer;
|
||||
now /= info.denom;
|
||||
return now;
|
||||
#elif defined(__linux)
|
||||
static struct timespec linux_rate;
|
||||
if (0 == is_init) {
|
||||
clock_getres(CLOCKID, &linux_rate);
|
||||
is_init = 1;
|
||||
}
|
||||
uint64_t now;
|
||||
struct timespec spec;
|
||||
clock_gettime(CLOCKID, &spec);
|
||||
now = spec.tv_sec * 1.0e9 + spec.tv_nsec;
|
||||
return now;
|
||||
#elif defined(_WIN32)
|
||||
static LARGE_INTEGER win_frequency;
|
||||
if (0 == is_init) {
|
||||
QueryPerformanceFrequency(&win_frequency);
|
||||
is_init = 1;
|
||||
}
|
||||
LARGE_INTEGER now;
|
||||
QueryPerformanceCounter(&now);
|
||||
return (uint64_t) ((1e9 * now.QuadPart) / win_frequency.QuadPart);
|
||||
#endif
|
||||
}
|
||||
|
||||
#define STRINGIFY(x) #x
|
||||
#define TOSTRING(x) STRINGIFY(x)
|
||||
#define ERROR(...) printf("abort at line " TOSTRING(__LINE__) ": " __VA_ARGS__); printf("\n"); exit(1)
|
||||
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// libpng encode/decode wrappers
|
||||
// Seriously, who thought this was a good abstraction for an API to read/write
|
||||
// images?
|
||||
|
||||
typedef struct {
|
||||
int size;
|
||||
int capacity;
|
||||
unsigned char *data;
|
||||
} libpng_write_t;
|
||||
|
||||
void libpng_encode_callback(png_structp png_ptr, png_bytep data, png_size_t length) {
|
||||
libpng_write_t *write_data = (libpng_write_t*)png_get_io_ptr(png_ptr);
|
||||
if (write_data->size + length >= write_data->capacity) {
|
||||
ERROR("PNG write");
|
||||
}
|
||||
memcpy(write_data->data + write_data->size, data, length);
|
||||
write_data->size += length;
|
||||
}
|
||||
|
||||
void *libpng_encode(void *pixels, int w, int h, int *out_len) {
|
||||
png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
||||
if (!png) {
|
||||
ERROR("png_create_write_struct");
|
||||
}
|
||||
|
||||
png_infop info = png_create_info_struct(png);
|
||||
if (!info) {
|
||||
ERROR("png_create_info_struct");
|
||||
}
|
||||
|
||||
if (setjmp(png_jmpbuf(png))) {
|
||||
ERROR("png_jmpbuf");
|
||||
}
|
||||
|
||||
// Output is 8bit depth, RGBA format.
|
||||
png_set_IHDR(
|
||||
png,
|
||||
info,
|
||||
w, h,
|
||||
8,
|
||||
PNG_COLOR_TYPE_RGBA,
|
||||
PNG_INTERLACE_NONE,
|
||||
PNG_COMPRESSION_TYPE_DEFAULT,
|
||||
PNG_FILTER_TYPE_DEFAULT
|
||||
);
|
||||
|
||||
png_bytep row_pointers[h];
|
||||
for(int y = 0; y < h; y++){
|
||||
row_pointers[y] = ((unsigned char *)pixels + y * w * 4);
|
||||
}
|
||||
|
||||
libpng_write_t write_data = {
|
||||
.size = 0,
|
||||
.capacity = w * h * 4,
|
||||
.data = malloc(w * h * 4)
|
||||
};
|
||||
|
||||
png_set_rows(png, info, row_pointers);
|
||||
png_set_write_fn(png, &write_data, libpng_encode_callback, NULL);
|
||||
png_write_png(png, info, PNG_TRANSFORM_IDENTITY, NULL);
|
||||
|
||||
png_destroy_write_struct(&png, &info);
|
||||
|
||||
*out_len = write_data.size;
|
||||
return write_data.data;
|
||||
}
|
||||
|
||||
|
||||
typedef struct {
|
||||
int pos;
|
||||
int size;
|
||||
unsigned char *data;
|
||||
} libpng_read_t;
|
||||
|
||||
void png_decode_callback(png_structp png, png_bytep data, png_size_t length) {
|
||||
libpng_read_t *read_data = (libpng_read_t*)png_get_io_ptr(png);
|
||||
if (read_data->pos + length > read_data->size) {
|
||||
ERROR("PNG read %d bytes at pos %d (size: %d)", length, read_data->pos, read_data->size);
|
||||
}
|
||||
memcpy(data, read_data->data + read_data->pos, length);
|
||||
read_data->pos += length;
|
||||
}
|
||||
|
||||
void *libpng_decode(void *data, int size, int *out_w, int *out_h) {
|
||||
png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
||||
if (!png) {
|
||||
ERROR("png_create_read_struct");
|
||||
}
|
||||
|
||||
png_infop info = png_create_info_struct(png);
|
||||
if (!info) {
|
||||
ERROR("png_create_info_struct");
|
||||
}
|
||||
|
||||
libpng_read_t read_data = {
|
||||
.pos = 0,
|
||||
.size = size,
|
||||
.data = data
|
||||
};
|
||||
|
||||
png_set_read_fn(png, &read_data, png_decode_callback);
|
||||
png_set_sig_bytes(png, 0);
|
||||
png_read_info(png, info);
|
||||
|
||||
png_uint_32 w, h;
|
||||
int bitDepth, colorType, interlaceType;
|
||||
png_get_IHDR(png, info, &w, &h, &bitDepth, &colorType, &interlaceType, NULL, NULL);
|
||||
|
||||
// 16 bit -> 8 bit
|
||||
png_set_strip_16(png);
|
||||
|
||||
// 1, 2, 4 bit -> 8 bit
|
||||
if (bitDepth < 8) {
|
||||
png_set_packing(png);
|
||||
}
|
||||
|
||||
if (colorType & PNG_COLOR_MASK_PALETTE) {
|
||||
png_set_expand(png);
|
||||
}
|
||||
|
||||
if (!(colorType & PNG_COLOR_MASK_COLOR)) {
|
||||
png_set_gray_to_rgb(png);
|
||||
}
|
||||
|
||||
// set paletted or RGB images with transparency to full alpha so we get RGBA
|
||||
if (png_get_valid(png, info, PNG_INFO_tRNS)) {
|
||||
png_set_tRNS_to_alpha(png);
|
||||
}
|
||||
|
||||
// make sure every pixel has an alpha value
|
||||
if (!(colorType & PNG_COLOR_MASK_ALPHA)) {
|
||||
png_set_filler(png, 255, PNG_FILLER_AFTER);
|
||||
}
|
||||
|
||||
png_read_update_info(png, info);
|
||||
|
||||
unsigned char* out = malloc(w * h * 4);
|
||||
*out_w = w;
|
||||
*out_h = h;
|
||||
|
||||
// png_uint_32 rowBytes = png_get_rowbytes(png, info);
|
||||
png_bytep row_pointers[h];
|
||||
for (png_uint_32 row = 0; row < h; row++ ) {
|
||||
row_pointers[row] = (png_bytep)(out + (row * w * 4));
|
||||
}
|
||||
|
||||
png_read_image(png, row_pointers);
|
||||
png_read_end(png, info);
|
||||
png_destroy_read_struct( &png, &info, NULL);
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// stb_image encode callback
|
||||
|
||||
void stbi_write_callback(void *context, void *data, int size) {
|
||||
int *encoded_size = (int *)context;
|
||||
*encoded_size += size;
|
||||
// In theory we'd need to do another malloc(), memcpy() and free() here to
|
||||
// be fair to the other decode functions...
|
||||
}
|
||||
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// function to load a whole file into memory
|
||||
|
||||
void *fload(const char *path, int *out_size) {
|
||||
FILE *fh = fopen(path, "rb");
|
||||
if (!fh) {
|
||||
ERROR("Can't open file");
|
||||
}
|
||||
|
||||
fseek(fh, 0, SEEK_END);
|
||||
int size = ftell(fh);
|
||||
fseek(fh, 0, SEEK_SET);
|
||||
|
||||
void *buffer = malloc(size);
|
||||
if (!buffer) {
|
||||
ERROR("Malloc for %d bytes failed", size);
|
||||
}
|
||||
|
||||
if (!fread(buffer, size, 1, fh)) {
|
||||
ERROR("Can't read file %s", path);
|
||||
}
|
||||
fclose(fh);
|
||||
|
||||
*out_size = size;
|
||||
return buffer;
|
||||
}
|
||||
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// benchmark runner
|
||||
|
||||
typedef struct {
|
||||
uint64_t size;
|
||||
uint64_t encode_time;
|
||||
uint64_t decode_time;
|
||||
} benchmark_lib_result_t;
|
||||
|
||||
typedef struct {
|
||||
uint64_t px;
|
||||
int w;
|
||||
int h;
|
||||
benchmark_lib_result_t libpng;
|
||||
benchmark_lib_result_t stbi;
|
||||
benchmark_lib_result_t qoi;
|
||||
} benchmark_result_t;
|
||||
|
||||
|
||||
// Run __VA_ARGS__ a number of times and meassure the time taken. The first
|
||||
// run is ignored.
|
||||
#define BENCHMARK_FN(RUNS, AVG_TIME, ...) \
|
||||
do { \
|
||||
uint64_t time = 0; \
|
||||
for (int i = 0; i <= RUNS; i++) { \
|
||||
uint64_t time_start = ns(); \
|
||||
__VA_ARGS__ \
|
||||
uint64_t time_end = ns(); \
|
||||
if (i > 0) { \
|
||||
time += time_end - time_start; \
|
||||
} \
|
||||
} \
|
||||
AVG_TIME = time / RUNS; \
|
||||
} while (0)
|
||||
|
||||
|
||||
benchmark_result_t benchmark_image(const char *path, int runs) {
|
||||
int encoded_png_size;
|
||||
int encoded_qoi_size;
|
||||
int w;
|
||||
int h;
|
||||
|
||||
// Load the encoded PNG, encoded QOI and raw pixels into memory
|
||||
void *pixels = (void *)stbi_load(path, &w, &h, NULL, 4);
|
||||
void *encoded_png = fload(path, &encoded_png_size);
|
||||
void *encoded_qoi = qoi_encode(pixels, w, h, 4, &encoded_qoi_size);
|
||||
|
||||
if (!pixels || !encoded_qoi || !encoded_png) {
|
||||
ERROR("Error decoding %s\n", path);
|
||||
}
|
||||
|
||||
benchmark_result_t res = {0};
|
||||
res.px = w * h;
|
||||
res.w = w;
|
||||
res.h = h;
|
||||
|
||||
|
||||
// Decoding
|
||||
|
||||
BENCHMARK_FN(runs, res.libpng.decode_time, {
|
||||
int dec_w, dec_h;
|
||||
void *dec_p = libpng_decode(encoded_png, encoded_png_size, &dec_w, &dec_h);
|
||||
free(dec_p);
|
||||
});
|
||||
|
||||
BENCHMARK_FN(runs, res.stbi.decode_time, {
|
||||
int dec_w, dec_h, dec_channels;
|
||||
void *dec_p = stbi_load_from_memory(encoded_png, encoded_png_size, &dec_w, &dec_h, &dec_channels, 4);
|
||||
free(dec_p);
|
||||
});
|
||||
|
||||
BENCHMARK_FN(runs, res.qoi.decode_time, {
|
||||
int dec_w, dec_h;
|
||||
void *dec_p = qoi_decode(encoded_qoi, encoded_qoi_size, &dec_w, &dec_h, 4);
|
||||
free(dec_p);
|
||||
});
|
||||
|
||||
|
||||
// Encoding
|
||||
|
||||
BENCHMARK_FN(runs, res.libpng.encode_time, {
|
||||
int enc_size;
|
||||
void *enc_p = libpng_encode(pixels, w, h, &enc_size);
|
||||
res.libpng.size = enc_size;
|
||||
free(enc_p);
|
||||
});
|
||||
|
||||
BENCHMARK_FN(runs, res.stbi.encode_time, {
|
||||
int enc_size = 0;
|
||||
stbi_write_png_to_func(stbi_write_callback, &enc_size, w, h, 4, pixels, 0);
|
||||
res.stbi.size = enc_size;
|
||||
});
|
||||
|
||||
BENCHMARK_FN(runs, res.qoi.encode_time, {
|
||||
int enc_size;
|
||||
void *enc_p = qoi_encode(pixels, w, h, 4, &enc_size);
|
||||
res.qoi.size = enc_size;
|
||||
free(enc_p);
|
||||
});
|
||||
|
||||
free(pixels);
|
||||
free(encoded_png);
|
||||
free(encoded_qoi);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
void benchmark_print_result(const char *head, benchmark_result_t res) {
|
||||
double px = res.px;
|
||||
printf("## %s size: %dx%d\n", head, res.w, res.h);
|
||||
printf(" decode ms encode ms decode mpps encode mpps size kb\n");
|
||||
printf(
|
||||
"libpng: %8.1f %8.1f %8.2f %8.2f %8d\n",
|
||||
(double)res.libpng.decode_time/1000000.0,
|
||||
(double)res.libpng.encode_time/1000000.0,
|
||||
(res.libpng.decode_time > 0 ? px / ((double)res.libpng.decode_time/1000.0) : 0),
|
||||
(res.libpng.encode_time > 0 ? px / ((double)res.libpng.encode_time/1000.0) : 0),
|
||||
res.libpng.size/1024
|
||||
);
|
||||
printf(
|
||||
"stbi: %8.1f %8.1f %8.2f %8.2f %8d\n",
|
||||
(double)res.stbi.decode_time/1000000.0,
|
||||
(double)res.stbi.encode_time/1000000.0,
|
||||
(res.stbi.decode_time > 0 ? px / ((double)res.stbi.decode_time/1000.0) : 0),
|
||||
(res.stbi.encode_time > 0 ? px / ((double)res.stbi.encode_time/1000.0) : 0),
|
||||
res.stbi.size/1024
|
||||
);
|
||||
printf(
|
||||
"qoi: %8.1f %8.1f %8.2f %8.2f %8d\n",
|
||||
(double)res.qoi.decode_time/1000000.0,
|
||||
(double)res.qoi.encode_time/1000000.0,
|
||||
(res.qoi.decode_time > 0 ? px / ((double)res.qoi.decode_time/1000.0) : 0),
|
||||
(res.qoi.encode_time > 0 ? px / ((double)res.qoi.encode_time/1000.0) : 0),
|
||||
res.qoi.size/1024
|
||||
);
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
if (argc < 3) {
|
||||
printf("Usage: qoibench <iterations> <directory>\n");
|
||||
printf("Example: qoibench 10 images/textures/\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
float total_percentage = 0;
|
||||
int total_size = 0;
|
||||
|
||||
benchmark_result_t totals = {0};
|
||||
|
||||
int runs = atoi(argv[1]);
|
||||
DIR *dir = opendir(argv[2]);
|
||||
if (runs <=0) {
|
||||
runs = 1;
|
||||
}
|
||||
|
||||
if (!dir) {
|
||||
ERROR("Couldn't open directory %s", argv[2]);
|
||||
}
|
||||
|
||||
printf("## Benchmarking %s/*.png -- %d runs\n\n", argv[2], runs);
|
||||
struct dirent *file;
|
||||
int i;
|
||||
for (i = 0; dir && (file = readdir(dir)) != NULL; i++) {
|
||||
if (strcmp(file->d_name + strlen(file->d_name) - 4, ".png") != 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
char *file_path = malloc(strlen(file->d_name) + strlen(argv[2])+8);
|
||||
sprintf(file_path, "%s/%s", argv[2], file->d_name);
|
||||
|
||||
benchmark_result_t res = benchmark_image(file_path, runs);
|
||||
benchmark_print_result(file_path, res);
|
||||
|
||||
free(file_path);
|
||||
|
||||
|
||||
totals.px += res.px;
|
||||
totals.libpng.encode_time += res.libpng.encode_time;
|
||||
totals.libpng.decode_time += res.libpng.decode_time;
|
||||
totals.libpng.size += res.libpng.size;
|
||||
totals.stbi.encode_time += res.stbi.encode_time;
|
||||
totals.stbi.decode_time += res.stbi.decode_time;
|
||||
totals.stbi.size += res.stbi.size;
|
||||
totals.qoi.encode_time += res.qoi.encode_time;
|
||||
totals.qoi.decode_time += res.qoi.decode_time;
|
||||
totals.qoi.size += res.qoi.size;
|
||||
}
|
||||
closedir(dir);
|
||||
|
||||
totals.px /= i;
|
||||
totals.libpng.encode_time /= i;
|
||||
totals.libpng.decode_time /= i;
|
||||
totals.libpng.size /= i;
|
||||
totals.stbi.encode_time /= i;
|
||||
totals.stbi.decode_time /= i;
|
||||
totals.stbi.size /= i;
|
||||
totals.qoi.encode_time /= i;
|
||||
totals.qoi.decode_time /= i;
|
||||
totals.qoi.size /= i;
|
||||
|
||||
benchmark_print_result("Totals (AVG)", totals);
|
||||
|
||||
return 0;
|
||||
}
|
||||
86
qoiconv.c
Normal file
86
qoiconv.c
Normal file
@ -0,0 +1,86 @@
|
||||
/*
|
||||
|
||||
Command line tool to convert between png <> qoi format
|
||||
|
||||
Requires "stb_image.h" and "stb_image_write.h"
|
||||
Compile with:
|
||||
gcc qoiconv.c -std=c99 -O3 -o qoiconv
|
||||
|
||||
Dominic Szablewski - https://phoboslab.org
|
||||
|
||||
|
||||
-- LICENSE: The MIT License(MIT)
|
||||
|
||||
Copyright(c) 2021 Dominic Szablewski
|
||||
|
||||
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.
|
||||
|
||||
*/
|
||||
|
||||
|
||||
#define STB_IMAGE_IMPLEMENTATION
|
||||
#define STBI_ONLY_PNG
|
||||
#define STBI_NO_LINEAR
|
||||
#include "stb_image.h"
|
||||
|
||||
#define STB_IMAGE_WRITE_IMPLEMENTATION
|
||||
#include "stb_image_write.h"
|
||||
|
||||
#define QOI_IMPLEMENTATION
|
||||
#include "qoi.h"
|
||||
|
||||
|
||||
#define STR_ENDS_WITH(S, E) (strcmp(S + strlen(S) - (sizeof(E)-1), E) == 0)
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
if (argc < 3) {
|
||||
printf("Usage: qoiconv infile outfile\n");
|
||||
printf("Examples:\n");
|
||||
printf(" qoiconv image.png image.qoi\n");
|
||||
printf(" qoiconv image.qoi image.png\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
void *pixels = NULL;
|
||||
int w, h;
|
||||
if (STR_ENDS_WITH(argv[1], ".png")) {
|
||||
pixels = (void *)stbi_load(argv[1], &w, &h, NULL, 4);
|
||||
}
|
||||
else if (STR_ENDS_WITH(argv[1], ".qoi")) {
|
||||
pixels = qoi_read(argv[1], &w, &h, 4);
|
||||
}
|
||||
|
||||
if (pixels == NULL) {
|
||||
printf("Couldn't load/decode %s\n", argv[1]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
int encoded = 0;
|
||||
if (STR_ENDS_WITH(argv[2], ".png")) {
|
||||
encoded = stbi_write_png(argv[2], w, h, 4, pixels, 0);
|
||||
}
|
||||
else if (STR_ENDS_WITH(argv[2], ".qoi")) {
|
||||
encoded = qoi_write(argv[2], pixels, w, h, 4);
|
||||
}
|
||||
|
||||
if (!encoded) {
|
||||
printf("Couldn't write/encode %s\n", argv[2]);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user