ref: ae319020740918973849652a5d0ab8ff7f8dbbd7
dir: /tools/pokemon_animation.c/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <getopt.h>
struct Frame {
uint8_t* data;
int size;
int bitmask;
};
struct Frames {
struct Frame* frames;
int num_frames;
int frame_size;
};
struct Bitmask {
uint8_t* data;
int bitlength;
};
struct Bitmasks {
struct Bitmask* bitmasks;
int num_bitmasks;
};
void make_frames(struct Frames* frames, struct Bitmasks* bitmasks, char* tilemap_filename, char* dimensions_filename);
int bitmask_exists(struct Bitmask *bitmask, struct Bitmasks *bitmasks);
void print_frames(struct Frames* frames);
void make_frames(struct Frames* frames, struct Bitmasks* bitmasks, char* tilemap_filename, char* dimensions_filename) {
uint8_t* tilemap;
uint8_t* this_frame;
FILE* f;
size_t size;
int width;
int height;
uint8_t byte;
int frame_size;
int num_frames;
int i, j;
f = fopen(tilemap_filename, "rb");
if (f == NULL) {
fprintf(stderr, "could not open file %s\n", tilemap_filename);
exit(1);
}
fseek(f, 0, SEEK_END);
size = ftell(f);
if (!size) {
fprintf(stderr, "empty file %s\n", tilemap_filename);
exit(1);
}
rewind(f);
tilemap = malloc(size);
if (!tilemap) {
fprintf(stderr, "malloc failure\n");
exit(1);
}
if (size != fread(tilemap, 1, size, f)) {
fprintf(stderr, "failed to read file %s\n", tilemap_filename);
exit(1);
}
fclose(f);
f = fopen(dimensions_filename, "rb");
if (f == NULL) {
fprintf(stderr, "could not open file %s\n", dimensions_filename);
exit(1);
}
if (1 != fread(&byte, 1, 1, f)) {
fprintf(stderr, "failed to read file %s\n", dimensions_filename);
exit(1);
}
fclose(f);
width = byte & 0xf;
height = byte >> 4;
frame_size = width * height;
num_frames = size / frame_size - 1;
//fprintf(stderr, "num_frames: %d\n", num_frames);
bitmasks->bitmasks = malloc((sizeof (struct Bitmask)) * num_frames);
bitmasks->num_bitmasks = 0;
frames->frames = malloc((sizeof (struct Frame)) * num_frames);
frames->frame_size = frame_size;
frames->num_frames = 0;
uint8_t *first_frame = tilemap;
this_frame = tilemap + frame_size;
for (i = 0; i < num_frames; i++) {
struct Frame *frame = (struct Frame*)malloc(sizeof(struct Frame));
frame->data = malloc(frame_size);
frame->size = 0;
struct Bitmask *bitmask = (struct Bitmask*)malloc(sizeof(struct Bitmask));
bitmask->data = calloc((frame_size + 7) / 8, 1);
bitmask->bitlength = 0;
for (j = 0; j < frame_size; j++) {
if (bitmask->bitlength % 8 == 0) {
bitmask->data[bitmask->bitlength / 8] = 0;
}
bitmask->data[bitmask->bitlength / 8] >>= 1;
if (this_frame[j] != first_frame[j]) {
frame->data[frame->size] = this_frame[j];
frame->size++;
bitmask->data[bitmask->bitlength / 8] |= (1 << 7);
}
bitmask->bitlength++;
}
// I don't remember exactly why this works.
// I think it was that the bits are read backwards, but not indexed backwards.
int last = bitmask->bitlength - 1;
bitmask->data[last / 8] >>= (7 - (last % 8));
frame->bitmask = bitmask_exists(bitmask, bitmasks);
if (frame->bitmask == -1) {
frame->bitmask = bitmasks->num_bitmasks;
bitmasks->bitmasks[bitmasks->num_bitmasks] = *bitmask;
bitmasks->num_bitmasks++;
} else {
free(bitmask->data);
free(bitmask);
}
frames->frames[i] = *frame;
frames->num_frames++;
this_frame += frame_size;
}
//for (i = 0; i < frames->num_frames; i++) {
//free(frames->frames[i].data);
//free(frames->frames[i]);
//}
//free(frames->frames);
//fprintf(stderr, "num bitmasks: %d\n", bitmasks->num_bitmasks);
//for (i = 0; i < bitmasks->num_bitmasks; i++) {
// free(bitmasks->bitmasks[i].data);
// fprintf(stderr, "freed bitmask %d\n", i);
//free(bitmasks->bitmasks[i]);
//}
//free(bitmasks->bitmasks);
//fprintf(stderr, "freed bitmasks\n");
free(tilemap);
}
int bitmask_exists(struct Bitmask *bitmask, struct Bitmasks *bitmasks) {
int i, j;
struct Bitmask existing;
for (i = 0; i < bitmasks->num_bitmasks; i++) {
existing = bitmasks->bitmasks[i];
if (bitmask->bitlength != existing.bitlength) {
continue;
}
bool match = true;
for (j = 0; j < (bitmask->bitlength + 7) / 8; j++) {
if (bitmask->data[j] != existing.data[j]) {
match = false;
break;
}
}
if (match) {
return i;
}
}
return -1;
}
void print_frames(struct Frames* frames) {
int i;
int j;
for (i = 0; i < frames->num_frames; i++) {
printf("\tdw .frame%d\n", i + 1);
}
for (i = 0; i < frames->num_frames; i++) {
struct Frame *frame = &frames->frames[i];
printf(".frame%d\n", i + 1);
printf("\tdb $%02x ; bitmask\n", frame->bitmask);
if (frame->size > 0) {
for (j = 0; j < frame->size; j++) {
if (j % 12 == 0) {
if (j) {
printf("\n");
}
printf("\tdb $%02x", frame->data[j]);
} else {
printf(", $%02x", frame->data[j]);
}
}
printf("\n");
}
}
}
void print_bitmasks(struct Bitmasks* bitmasks) {
int i, j, k;
int length;
struct Bitmask bitmask;
for (i = 0; i < bitmasks->num_bitmasks; i++) {
printf("; %d\n", i);
bitmask = bitmasks->bitmasks[i];
length = (bitmask.bitlength + 7) / 8;
for (j = 0; j < length; j++) {
printf("\tdb %%");
for (k = 0; k < 8; k++) {
if ((bitmask.data[j] >> (7 - k)) & 1) {
printf("1");
} else {
printf("0");
};
}
printf("\n");
}
}
}
// HOW ARE YOU GENTLEMEN.
char* cats (char* head, char* tail) {
char* string;
string = malloc(strlen(head) + strlen(tail) + 1);
strcpy(string, head);
strcat(string, tail);
return string;
}
static void usage(void) {
printf("Usage: pokemon_animation [-b] [-f] tilemap_file dimensions_file\n");
exit(1);
}
int main(int argc, char* argv[]) {
struct Frames frames = {0};
struct Bitmasks bitmasks = {0};
int ch;
bool use_bitmasks = false, use_frames = false;
char* tilemap_filename;
char* dimensions_filename;
while ((ch = getopt(argc, argv, "bf")) != -1) {
switch (ch) {
case 'b':
use_bitmasks = true;
break;
case 'f':
use_frames = true;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 2) {
usage();
}
tilemap_filename = argv[0];
dimensions_filename = argv[1];
//ext = strrchr(argv[3], '.');
//if (!ext || ext == argv[3]) {
// fprintf(stderr, "need a file extension to determine what to write to %s\n", argv[3]);
//}
make_frames(&frames, &bitmasks, tilemap_filename, dimensions_filename);
if (use_frames) {
print_frames(&frames);
}
if (use_bitmasks) {
print_bitmasks(&bitmasks);
}
return 0;
}