ref: e4d60b4e5bdbb2303452e3c7f470e6eb02cae68c
dir: /tools/gfx.c/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <getopt.h>
#include <string.h>
#include <stdint.h>
#include "common.h"
static void usage(void) {
fprintf(stderr, "Usage: gfx [--trim-whitespace] [--remove-whitespace] [--interleave] [--remove-duplicates [--keep-whitespace]] [--remove-xflip] [--remove-yflip] [--png filename] [-d depth] [-h] [-o outfile] infile\n");
}
static void error(char *message) {
fputs(message, stderr);
fputs("\n", stderr);
}
struct Options {
int trim_whitespace;
int remove_whitespace;
int help;
char *outfile;
int depth;
int interleave;
int remove_duplicates;
int keep_whitespace;
int remove_xflip;
int remove_yflip;
char *png_file;
};
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},
{"remove-duplicates", no_argument, &Options.remove_duplicates, 1},
{"keep-whitespace", no_argument, &Options.keep_whitespace, 1},
{"remove-xflip", no_argument, &Options.remove_xflip, 1},
{"remove-yflip", no_argument, &Options.remove_yflip, 1},
{"png", required_argument, 0, 'p'},
{"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:p:", long_options)) {
case 'h':
Options.help = true;
break;
case 'o':
Options.outfile = optarg;
break;
case 'd':
Options.depth = strtoul(optarg, NULL, 0);
break;
case 'p':
Options.png_file = optarg;
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;
if (Options.interleave) tile_size *= 2;
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 >= graphic->size) {
break;
}
if (j > i) {
memcpy(&graphic->data[i], &graphic->data[j], tile_size);
}
}
graphic->size = i;
}
bool tile_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles) {
for (int i = 0; i < num_tiles; i++) {
bool match = true;
for (int j = 0; j < tile_size; j++) {
if (tile[j] != tiles[i * tile_size + j]) {
match = false;
}
}
if (match) {
return true;
}
}
return false;
}
void remove_duplicates(struct Graphic *graphic) {
int tile_size = Options.depth * 8;
if (Options.interleave) tile_size *= 2;
int num_tiles = 0;
for (int i = 0, j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
while (tile_exists(&graphic->data[j], graphic->data, tile_size, num_tiles)) {
if (Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) {
break;
}
j += tile_size;
}
if (j >= graphic->size) {
break;
}
if (j > i) {
memcpy(&graphic->data[i], &graphic->data[j], tile_size);
}
num_tiles++;
}
graphic->size = num_tiles * tile_size;
}
bool flip_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles, bool xflip, bool yflip) {
uint8_t *flip = calloc(tile_size, 1);
int half_size = tile_size / 2;
for (int i = 0; i < tile_size; i++) {
int byte = i;
if (yflip) {
byte = tile_size - 1 - (i ^ 1);
if (Options.interleave && i < half_size) {
byte = half_size - 1 - (i ^ 1);
}
}
if (xflip) {
for (int bit = 0; bit < 8; bit++) {
flip[byte] |= ((tile[i] >> bit) & 1) << (7 - bit);
}
} else {
flip[byte] = tile[i];
}
}
if (tile_exists(flip, tiles, tile_size, num_tiles)) {
return true;
}
return false;
}
void remove_flip(struct Graphic *graphic, bool xflip, bool yflip) {
int tile_size = Options.depth * 8;
if (Options.interleave) tile_size *= 2;
int num_tiles = 0;
for (int i = 0, j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
while (flip_exists(&graphic->data[j], graphic->data, tile_size, num_tiles, xflip, yflip)) {
if (Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) {
break;
}
j += tile_size;
}
if (j >= graphic->size) {
break;
}
if (j > i) {
memcpy(&graphic->data[i], &graphic->data[j], tile_size);
}
num_tiles++;
}
graphic->size = num_tiles * tile_size;
}
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);
}
graphic->size = num_tiles * tile_size;
memcpy(graphic->data, interleaved, graphic->size);
free(interleaved);
}
int png_get_width(char *filename) {
FILE *f = fopen_verbose(filename, "rb");
if (!f) {
exit(1);
}
const int OFFSET_WIDTH = 16;
uint8_t bytes[4];
fseek(f, OFFSET_WIDTH, SEEK_SET);
size_t size = 4;
size_t result = fread(bytes, 1, size, f);
fclose(f);
if (result != size) {
fprintf(stderr, "Could not read file at offset 0x%x: \"%s\"\n", OFFSET_WIDTH, filename);
exit(1);
}
int width = 0;
for (int i = 0; i < 4; i++) {
width |= bytes[i] << (8 * (3 - i));
}
return width;
}
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.trim_whitespace) {
trim_whitespace(&graphic);
}
if (Options.interleave) {
if (!Options.png_file) {
error("interleave: need --png to infer dimensions");
usage();
exit(1);
}
int width = png_get_width(Options.png_file);
interleave(&graphic, width);
}
if (Options.remove_duplicates) {
remove_duplicates(&graphic);
}
if (Options.remove_xflip) {
remove_flip(&graphic, true, false);
}
if (Options.remove_yflip) {
remove_flip(&graphic, false, true);
}
if (Options.remove_xflip && Options.remove_yflip) {
remove_flip(&graphic, true, true);
}
if (Options.remove_whitespace) {
remove_whitespace(&graphic);
}
if (Options.outfile) {
write_u8(Options.outfile, graphic.data, graphic.size);
}
free(graphic.data);
return 0;
}