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/*
* This file is part of Netpbm (http://netpbm.sourceforge.org).
* Copyright (c) 2022 cancername.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pam.h"
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include "qoi.h"
#define QOI_MAXVAL 0xFF
/* Resizes buf of type T* so that at least needed+1 bytes
are available, executing err if realloc fails.
Uses realloc -- is there a Netpbm equivalent? */
#define RESIZE(buf, T, needed, allocated, err) \
do { \
size_t tmpn = (allocated); \
while((needed)+1 >= tmpn) \
tmpn = tmpn ? tmpn * 2 : 8; \
if(tmpn != allocated) { \
T *tmpb = realloc((buf), tmpn); \
if(!tmpb) {err} \
else { \
(allocated) = tmpn; \
(buf) = tmpb; \
} \
} \
} while(0)
/* Unfortunately, qoi.h does not implement a streaming decoder,
we need to read the whole stream into memory -- expensive.
We might be able to cheat here with mmap sometimes,
but it's not worth the effort. */
static void *read_into_mem(FILE *f, size_t *s) {
*s = 0;
unsigned char *buf = NULL;
size_t allocated = 0;
size_t x = 0;
size_t r = 0;
do {
x += r;
RESIZE(buf, unsigned char, x+4096, allocated, free(buf); return NULL;);
r = fread(buf + x, 1, 4096, f);
} while(r != 0);
if(ferror(f)) {
free(buf);
return NULL;
}
else {
/* buf = realloc(buf, x); */
*s = x;
return buf;
}
}
int main(int argc, char **argv) {
struct pam output = {
.size = sizeof(struct pam),
.len = PAM_STRUCT_SIZE(tuple_type),
.maxval = QOI_MAXVAL,
.plainformat = 0
};
qoi_desc qd = {
.channels = 0
};
pm_proginit(&argc, (const char **)argv);
size_t il = 0;
char *img;
unsigned char *qoi_buf;
tuple *tr;
img = read_into_mem(stdin, &il);
if(!img || il == 0)
pm_error("Failed to read qoi into memory.");
qoi_buf = qoi_decode(img, il, &qd, 0);
free(img);
if(!qoi_buf)
pm_error("Decoding qoi failed.");
output.depth = qd.channels == 3 ? 3 : 4;
output.width = qd.width;
output.height = qd.height;
output.file = stdout;
/* Output PPM if the input is RGB only,
PAM with tuple type RGB_ALPHA otherwise. */
if(qd.channels == 3) {
output.format = PPM_FORMAT;
strcpy(output.tuple_type, PAM_PPM_TUPLETYPE);
}
else {
output.format = PAM_FORMAT;
strcpy(output.tuple_type, PAM_PPM_ALPHA_TUPLETYPE);
}
pnm_writepaminit(&output);
tr = pnm_allocpamrow(&output);
size_t k = 0;
if(output.depth == 3) {
for(int i = 0; i < output.height; i++) {
for(int j = 0; j < output.width; j++) {
tr[j][0] = qoi_buf[k++];
tr[j][1] = qoi_buf[k++];
tr[j][2] = qoi_buf[k++];
}
pnm_writepamrow(&output, tr);
}
}
else {
for(int i = 0; i < output.height; i++) {
for(int j = 0; j < output.width; j++) {
tr[j][0] = qoi_buf[k++];
tr[j][1] = qoi_buf[k++];
tr[j][2] = qoi_buf[k++];
tr[j][3] = qoi_buf[k++];
}
pnm_writepamrow(&output, tr);
}
}
free(qoi_buf);
pnm_freepamrow(tr);
return 0;
}
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