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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <getopt.h>
#include <string.h>
#include "common.h"
static void usage(void) {
fprintf(stderr, "Usage: gfx [--trim-whitespace] [--remove-whitespace] [--interleave] [-w width] [-d depth] [-h] [-o outfile] infile\n");
}
static void error(char *message) {
fprintf(stderr, message);
fprintf(stderr, "\n");
}
struct Options {
int trim_whitespace;
int remove_whitespace;
int help;
char *outfile;
int depth;
int interleave;
int width;
};
struct Options Options = {
.depth = 2,
};
void get_args(int argc, char *argv[]) {
struct option long_options[] = {
{"remove-whitespace", no_argument, &Options.remove_whitespace, 1},
{"trim-whitespace", no_argument, &Options.trim_whitespace, 1},
{"interleave", no_argument, &Options.interleave, 1},
{"width", required_argument, 0, 'w'},
{"depth", required_argument, 0, 'd'},
{"help", no_argument, 0, 'h'},
{0}
};
for (int opt = 0; opt != -1;) {
switch (opt = getopt_long(argc, argv, "ho:d:", long_options)) {
case 'h':
Options.help = true;
break;
case 'o':
Options.outfile = optarg;
break;
case 'd':
Options.depth = strtoul(optarg, NULL, 0);
break;
case 'w':
Options.width = strtoul(optarg, NULL, 0);
break;
case 0:
case -1:
break;
default:
usage();
exit(1);
break;
}
}
}
struct Graphic {
int size;
uint8_t *data;
};
bool is_whitespace(uint8_t *tile, int tile_size) {
uint8_t WHITESPACE = 0;
for (int i = 0; i < tile_size; i++) {
if (tile[i] != WHITESPACE) {
return false;
}
}
return true;
}
void trim_whitespace(struct Graphic *graphic) {
int tile_size = Options.depth * 8;
for (int i = graphic->size - tile_size; i > 0; i -= tile_size) {
if (is_whitespace(&graphic->data[i], tile_size)) {
graphic->size = i;
} else {
break;
}
}
}
void remove_whitespace(struct Graphic *graphic) {
int tile_size = Options.depth * 8;
int i = 0;
for (int j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
while (is_whitespace(&graphic->data[j], tile_size)) {
j += tile_size;
}
if (j > i) {
memcpy(&graphic->data[i], &graphic->data[j], tile_size);
}
}
graphic->size = i;
}
void interleave(struct Graphic *graphic, int width) {
int tile_size = Options.depth * 8;
int width_tiles = width / 8;
int num_tiles = graphic->size / tile_size;
uint8_t *interleaved = malloc(graphic->size);
for (int i = 0; i < num_tiles; i++) {
int tile = i * 2;
int row = i / width_tiles;
tile -= width_tiles * row;
if (row % 2) {
tile -= width_tiles;
tile += 1;
}
memcpy(&interleaved[tile * tile_size], &graphic->data[i * tile_size], tile_size);
}
memcpy(graphic->data, interleaved, graphic->size);
free(interleaved);
}
int main(int argc, char *argv[]) {
get_args(argc, argv);
argc -= optind;
argv += optind;
if (Options.help) {
usage();
return 0;
}
if (argc < 1) {
usage();
exit(1);
}
char *infile = argv[0];
struct Graphic graphic;
graphic.data = read_u8(infile, &graphic.size);
if (Options.remove_whitespace) {
remove_whitespace(&graphic);
}
if (Options.trim_whitespace) {
trim_whitespace(&graphic);
}
if (Options.interleave) {
if (!Options.width) {
error("interleave: must set --width to a nonzero value");
usage();
exit(1);
}
interleave(&graphic, Options.width);
}
if (Options.outfile) {
write_u8(Options.outfile, graphic.data, graphic.size);
}
free(graphic.data);
return 0;
}
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