feely_pona/External/qoiconv.c

92 lines
1.9 KiB
C

/*
Copyright (c) 2021, Dominic Szablewski - https://phoboslab.org
SPDX-License-Identifier: MIT
Command line tool to convert between png <> qoi format
Requires:
-"stb_image.h" (https://github.com/nothings/stb/blob/master/stb_image.h)
-"stb_image_write.h" (https://github.com/nothings/stb/blob/master/stb_image_write.h)
-"qoi.h" (https://github.com/phoboslab/qoi/blob/master/qoi.h)
Compile with:
gcc qoiconv.c -std=c99 -O3 -o qoiconv
*/
#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) {
puts("Usage: qoiconv <infile> <outfile>");
puts("Examples:");
puts(" qoiconv input.png output.qoi");
puts(" qoiconv input.qoi output.png");
exit(1);
}
void *pixels = NULL;
int w, h, channels;
if (STR_ENDS_WITH(argv[1], ".png")) {
if(!stbi_info(argv[1], &w, &h, &channels)) {
printf("Couldn't read header %s\n", argv[1]);
exit(1);
}
// Force all odd encodings to be RGBA
if(channels != 3) {
channels = 4;
}
pixels = (void *)stbi_load(argv[1], &w, &h, NULL, channels);
}
else if (STR_ENDS_WITH(argv[1], ".qoi")) {
qoi_desc desc;
pixels = qoi_read(argv[1], &desc, 0);
channels = desc.channels;
w = desc.width;
h = desc.height;
}
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, channels, pixels, 0);
}
else if (STR_ENDS_WITH(argv[2], ".qoi")) {
encoded = qoi_write(argv[2], pixels, &(qoi_desc){
.width = w,
.height = h,
.channels = channels,
.colorspace = QOI_SRGB
});
}
if (!encoded) {
printf("Couldn't write/encode %s\n", argv[2]);
exit(1);
}
free(pixels);
return 0;
}