mirror of https://github.com/pret/pokecrystal.git
346 lines
8.4 KiB
C
346 lines
8.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <getopt.h>
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#include <string.h>
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#include <stdint.h>
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#include "common.h"
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static void usage(void) {
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fprintf(stderr, "Usage: gfx [--trim-whitespace] [--remove-whitespace] [--interleave] [--remove-duplicates [--keep-whitespace]] [--remove-xflip] [--remove-yflip] [--preserve indexes] [--png filename] [-d depth] [-h] [-o outfile] infile\n");
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}
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static void error(char *message) {
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fputs(message, stderr);
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fputs("\n", stderr);
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}
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struct Options {
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int trim_whitespace;
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int remove_whitespace;
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int help;
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char *outfile;
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int depth;
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int interleave;
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int remove_duplicates;
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int keep_whitespace;
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int remove_xflip;
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int remove_yflip;
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int *preserved;
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int num_preserved;
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char *png_file;
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};
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struct Options Options = {
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.depth = 2,
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};
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void get_args(int argc, char *argv[]) {
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struct option long_options[] = {
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{"remove-whitespace", no_argument, &Options.remove_whitespace, 1},
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{"trim-whitespace", no_argument, &Options.trim_whitespace, 1},
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{"interleave", no_argument, &Options.interleave, 1},
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{"remove-duplicates", no_argument, &Options.remove_duplicates, 1},
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{"keep-whitespace", no_argument, &Options.keep_whitespace, 1},
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{"remove-xflip", no_argument, &Options.remove_xflip, 1},
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{"remove-yflip", no_argument, &Options.remove_yflip, 1},
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{"preserve", required_argument, 0, 'r'},
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{"png", required_argument, 0, 'p'},
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{"depth", required_argument, 0, 'd'},
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{"help", no_argument, 0, 'h'},
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{0}
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};
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char *token;
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for (int opt = 0; opt != -1;) {
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switch (opt = getopt_long(argc, argv, "ho:d:p:", long_options)) {
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case 'h':
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Options.help = true;
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break;
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case 'o':
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Options.outfile = optarg;
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break;
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case 'd':
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Options.depth = strtoul(optarg, NULL, 0);
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break;
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case 'r':
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token = strtok(optarg, ",");
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while (token) {
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Options.num_preserved++;
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Options.preserved = realloc(Options.preserved, Options.num_preserved * sizeof(int));
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Options.preserved[Options.num_preserved-1] = strtoul(token, NULL, 0);
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token = strtok(NULL, ",");
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}
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break;
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case 'p':
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Options.png_file = optarg;
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break;
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case 0:
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case -1:
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break;
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default:
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usage();
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exit(1);
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break;
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}
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}
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}
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bool is_preserved(int index) {
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for (int i = 0; i < Options.num_preserved; i++) {
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if (Options.preserved[i] == index) {
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return true;
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}
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}
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return false;
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}
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void shift_preserved(int removed_index) {
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for (int i = 0; i < Options.num_preserved; i++) {
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if (Options.preserved[i] >= removed_index) {
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Options.preserved[i]--;
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}
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}
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}
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struct Graphic {
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int size;
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uint8_t *data;
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};
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bool is_whitespace(uint8_t *tile, int tile_size) {
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uint8_t WHITESPACE = 0;
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for (int i = 0; i < tile_size; i++) {
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if (tile[i] != WHITESPACE) {
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return false;
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}
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}
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return true;
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}
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void trim_whitespace(struct Graphic *graphic) {
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int tile_size = Options.depth * 8;
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for (int i = graphic->size - tile_size; i > 0; i -= tile_size) {
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if (is_whitespace(&graphic->data[i], tile_size) && !is_preserved(i / tile_size)) {
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graphic->size = i;
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} else {
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break;
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}
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}
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}
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void remove_whitespace(struct Graphic *graphic) {
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int tile_size = Options.depth * 8;
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if (Options.interleave) tile_size *= 2;
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// Make sure we have a whole number of tiles, round down if required
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graphic->size &= ~(tile_size - 1);
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int i = 0;
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for (int j = 0, d = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
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while (j < graphic->size && is_whitespace(&graphic->data[j], tile_size) && !is_preserved(j / tile_size - d)) {
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shift_preserved(j / tile_size - d);
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d++;
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j += tile_size;
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}
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if (j >= graphic->size) {
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break;
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}
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if (j > i) {
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memcpy(&graphic->data[i], &graphic->data[j], tile_size);
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}
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}
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graphic->size = i;
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}
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bool tile_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles) {
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for (int i = 0; i < num_tiles; i++) {
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bool match = true;
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for (int j = 0; j < tile_size; j++) {
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if (tile[j] != tiles[i * tile_size + j]) {
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match = false;
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}
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}
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if (match) {
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return true;
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}
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}
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return false;
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}
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void remove_duplicates(struct Graphic *graphic) {
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int tile_size = Options.depth * 8;
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if (Options.interleave) tile_size *= 2;
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int num_tiles = 0;
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// Make sure we have a whole number of tiles, round down if required
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graphic->size &= ~(tile_size - 1);
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for (int i = 0, j = 0, d = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
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while (j < graphic->size && tile_exists(&graphic->data[j], graphic->data, tile_size, num_tiles)) {
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if ((Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) || is_preserved(j / tile_size - d)) {
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break;
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}
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shift_preserved(j / tile_size - d);
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d++;
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j += tile_size;
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}
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if (j >= graphic->size) {
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break;
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}
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if (j > i) {
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memcpy(&graphic->data[i], &graphic->data[j], tile_size);
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}
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num_tiles++;
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}
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graphic->size = num_tiles * tile_size;
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}
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bool flip_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles, bool xflip, bool yflip) {
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uint8_t flip[tile_size];
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memset(flip, 0, sizeof(flip));
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int half_size = tile_size / 2;
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for (int i = 0; i < tile_size; i++) {
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int byte = i;
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if (yflip) {
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byte = tile_size - 1 - (i ^ 1);
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if (Options.interleave && i < half_size) {
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byte = half_size - 1 - (i ^ 1);
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}
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}
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if (xflip) {
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for (int bit = 0; bit < 8; bit++) {
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flip[byte] |= ((tile[i] >> bit) & 1) << (7 - bit);
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}
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} else {
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flip[byte] = tile[i];
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}
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}
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if (tile_exists(flip, tiles, tile_size, num_tiles)) {
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return true;
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}
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return false;
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}
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void remove_flip(struct Graphic *graphic, bool xflip, bool yflip) {
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int tile_size = Options.depth * 8;
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if (Options.interleave) tile_size *= 2;
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int num_tiles = 0;
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// Make sure we have a whole number of tiles, round down if required
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graphic->size &= ~(tile_size - 1);
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for (int i = 0, j = 0, d = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) {
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while (j < graphic->size && flip_exists(&graphic->data[j], graphic->data, tile_size, num_tiles, xflip, yflip)) {
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if ((Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) || is_preserved(j / tile_size - d)) {
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break;
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}
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shift_preserved(j / tile_size - d);
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d++;
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j += tile_size;
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}
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if (j >= graphic->size) {
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break;
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}
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if (j > i) {
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memcpy(&graphic->data[i], &graphic->data[j], tile_size);
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}
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num_tiles++;
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}
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graphic->size = num_tiles * tile_size;
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}
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void interleave(struct Graphic *graphic, int width) {
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int tile_size = Options.depth * 8;
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int width_tiles = width / 8;
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int num_tiles = graphic->size / tile_size;
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uint8_t *interleaved = malloc(graphic->size);
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for (int i = 0; i < num_tiles; i++) {
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int tile = i * 2;
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int row = i / width_tiles;
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tile -= width_tiles * row;
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if (row % 2) {
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tile -= width_tiles;
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tile += 1;
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}
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memcpy(&interleaved[tile * tile_size], &graphic->data[i * tile_size], tile_size);
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}
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graphic->size = num_tiles * tile_size;
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memcpy(graphic->data, interleaved, graphic->size);
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free(interleaved);
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}
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int png_get_width(char *filename) {
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FILE *f = fopen_verbose(filename, "rb");
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if (!f) {
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exit(1);
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}
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const int OFFSET_WIDTH = 16;
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uint8_t bytes[4];
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fseek(f, OFFSET_WIDTH, SEEK_SET);
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size_t size = 4;
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size_t result = fread(bytes, 1, size, f);
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fclose(f);
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if (result != size) {
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fprintf(stderr, "Could not read file at offset 0x%x: \"%s\"\n", OFFSET_WIDTH, filename);
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exit(1);
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}
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int width = 0;
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for (int i = 0; i < 4; i++) {
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width |= bytes[i] << (8 * (3 - i));
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}
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return width;
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}
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int main(int argc, char *argv[]) {
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get_args(argc, argv);
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argc -= optind;
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argv += optind;
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if (Options.help) {
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usage();
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return 0;
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}
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if (argc < 1) {
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usage();
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exit(1);
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}
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char *infile = argv[0];
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struct Graphic graphic;
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graphic.data = read_u8(infile, &graphic.size);
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if (Options.trim_whitespace) {
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trim_whitespace(&graphic);
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}
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if (Options.interleave) {
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if (!Options.png_file) {
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error("interleave: need --png to infer dimensions");
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usage();
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exit(1);
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}
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int width = png_get_width(Options.png_file);
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interleave(&graphic, width);
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}
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if (Options.remove_duplicates) {
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remove_duplicates(&graphic);
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}
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if (Options.remove_xflip) {
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remove_flip(&graphic, true, false);
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}
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if (Options.remove_yflip) {
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remove_flip(&graphic, false, true);
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}
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if (Options.remove_xflip && Options.remove_yflip) {
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remove_flip(&graphic, true, true);
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}
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if (Options.remove_whitespace) {
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remove_whitespace(&graphic);
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}
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if (Options.outfile) {
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write_u8(Options.outfile, graphic.data, graphic.size);
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}
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free(graphic.data);
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return 0;
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}
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