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/* See LICENSE file for copyright and license details. */
#include <arpa/inet.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include "util.h"
static void
png_err(png_struct *pngs, const char *msg)
{
(void)pngs;
fprintf(stderr, "%s: libpng: %s\n", argv0, msg);
exit(1);
}
static void
png_setup_writer(png_struct **s, png_info **i, uint32_t w, uint32_t h)
{
*s = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, png_err, NULL);
*i = png_create_info_struct(*s);
if (!*s || !*i) {
fprintf(stderr, "%s: failed to initialize libpng\n", argv0);
exit(1);
}
png_init_io(*s, stdout);
png_set_IHDR(*s, *i, w, h, 16, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
png_write_info(*s, *i);
}
static void
usage(void)
{
fprintf(stderr, "usage: %s\n", argv0);
exit(1);
}
int
main(int argc, char *argv[])
{
png_struct *pngs;
png_info *pngi;
size_t rowlen;
uint32_t width, height, i;
uint16_t *row;
/* arguments */
argv0 = argv[0], argc--, argv++;
if (argc) {
usage();
}
/* prepare */
ff_read_header(&width, &height);
png_setup_writer(&pngs, &pngi, width, height);
row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(uint16_t));
rowlen = width * (sizeof("RGBA") - 1);
/* write data */
for (i = 0; i < height; ++i) {
if (fread(row, sizeof(uint16_t), rowlen, stdin) != rowlen) {
if (ferror(stdin)) {
fprintf(stderr, "%s: fread: %s\n", argv0, strerror(errno));
} else {
fprintf(stderr, "%s: unexpected end of file\n", argv0);
}
return 1;
}
png_write_row(pngs, (uint8_t *)row);
}
/* clean up */
png_write_end(pngs, NULL);
png_destroy_write_struct(&pngs, NULL);
return fshut(stdout, "<stdout>");
}
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