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	ff2png.c - farbfeld - suckless image format with conversion tools
	git clone git://git.suckless.org/farbfeld
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	ff2png.c (1526B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <arpa/inet.h>
	3
	4 #include <errno.h>
	5 #include <stdint.h>
	6 #include <stdio.h>
	7 #include <stdlib.h>
	8 #include <string.h>
	9
	10 #include <png.h>
	11
	12 #include "util.h"
	13
	14 static void
	15 png_err(png_struct pngs, const char msg)
	16 {
	17 (void)pngs;
	18 die("libpng: %s", msg);
	19 }
	20
	21 static void
	22 png_setup_writer(png_struct s, png_info i, uint32_t w, uint32_t h)
	23 {
	24 *s = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, png_er…
	25 i = png_create_info_struct(s);
	26
	27 if (!s \|\| !i) {
	28 die("Failed to initialize libpng");
	29 }
	30
	31 png_init_io(*s, stdout);
	32 png_set_IHDR(s, i, w, h, 16, PNG_COLOR_TYPE_RGB_ALPHA,
	33 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
	34 PNG_FILTER_TYPE_BASE);
	35 png_write_info(s, i);
	36 }
	37
	38 static void
	39 usage(void)
	40 {
	41 die("usage: %s", argv0);
	42 }
	43
	44 int
	45 main(int argc, char *argv[])
	46 {
	47 png_struct *pngs;
	48 png_info *pngi;
	49 size_t rowlen;
	50 uint32_t width, height, i;
	51 uint16_t *row;
	52
	53 /* arguments */
	54 argv0 = argv[0], argc--, argv++;
	55
	56 if (argc) {
	57 usage();
	58 }
	59
	60 /* prepare */
	61 ff_read_header(&width, &height);
	62 png_setup_writer(&pngs, &pngi, width, height);
	63 row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(u…
	64 rowlen = width * (sizeof("RGBA") - 1);
	65
	66 /* write data */
	67 for (i = 0; i < height; ++i) {
	68 efread(row, sizeof(uint16_t), rowlen, stdin);
	69 png_write_row(pngs, (uint8_t *)row);
	70 }
	71
	72 /* clean up */
	73 png_write_end(pngs, NULL);
	74 png_destroy_write_struct(&pngs, NULL);
	75
	76 return fshut(stdout, "<stdout>");
	77 }