ref: 20ebfd079f1331af5cc4f0edea35163b5b35612d
dir: /tools/pkmncompress.c/
/*
* Copyright © 2013 stag019 <stag019@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define PROGRAM_NAME "pkmncompress"
#define USAGE_OPTS "infile.2bpp outfile.pic"
#include "common.h"
uint8_t compressed[15 * 15 * 0x10];
int cur_bit;
int cur_byte;
void write_bit(int bit) {
if (++cur_bit == 8) {
cur_byte++;
cur_bit = 0;
}
compressed[cur_byte] |= bit << (7 - cur_bit);
}
void compress_plane(uint8_t *plane, int width) {
static int gray_codes[2][0x10] = {
{0x0, 0x1, 0x3, 0x2, 0x6, 0x7, 0x5, 0x4, 0xC, 0xD, 0xF, 0xE, 0xA, 0xB, 0x9, 0x8},
{0x8, 0x9, 0xB, 0xA, 0xE, 0xF, 0xD, 0xC, 0x4, 0x5, 0x7, 0x6, 0x2, 0x3, 0x1, 0x0},
};
int ram_size = width * width * 8;
for (int i = 0, nybble_lo = 0; i < ram_size; i++) {
int m = i % width;
if (!m) {
nybble_lo = 0;
}
int j = i / width + m * width * 8;
int nybble_hi = (plane[j] >> 4) & 0xF;
int code_hi = gray_codes[nybble_lo & 1][nybble_hi];
nybble_lo = plane[j] & 0xF;
int code_lo = gray_codes[nybble_hi & 1][nybble_lo];
plane[j] = (code_hi << 4) | code_lo;
}
}
void rle_encode_number(int n) {
int bit_count = -1;
int v = ++n;
v++;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v -= v >> 1;
v--;
int number = n - v;
while (v) {
v >>= 1;
bit_count++;
}
for (int j = 0; j < bit_count; j++) {
write_bit(1);
}
write_bit(0);
for (int j = bit_count; j >= 0; j--) {
write_bit((number >> j) & 1);
}
}
void write_data_packet(uint8_t *bit_groups, int n) {
for (int i = 0; i < n; i++) {
write_bit((bit_groups[i] >> 1) & 1);
write_bit(bit_groups[i] & 1);
}
}
int interpret_compress(uint8_t *plane1, uint8_t *plane2, int mode, int order, int width) {
int ram_size = width * width * 8;
uint8_t *_plane1 = xmalloc(ram_size);
uint8_t *_plane2 = xmalloc(ram_size);
if (order) {
memcpy(_plane1, plane2, ram_size);
memcpy(_plane2, plane1, ram_size);
} else {
memcpy(_plane1, plane1, ram_size);
memcpy(_plane2, plane2, ram_size);
}
if (mode != 1) {
for (int i = 0; i < ram_size; i++) {
_plane2[i] ^= _plane1[i];
}
}
compress_plane(_plane1, width);
if (mode != 2) {
compress_plane(_plane2, width);
}
cur_bit = 7;
cur_byte = 0;
memset(compressed, 0, COUNTOF(compressed));
compressed[0] = (width << 4) | width;
write_bit(order);
uint8_t bit_groups[0x1000] = {0};
int index = 0;
for (int plane = 0; plane < 2; plane++) {
int type = 0;
int nums = 0;
memset(bit_groups, 0, COUNTOF(bit_groups));
for (int x = 0; x < width; x++) {
for (int bit = 0; bit < 8; bit += 2) {
for (int y = 0, byte = x * width * 8; y < width * 8; y++, byte++) {
int bit_group = ((plane ? _plane2 : _plane1)[byte] >> (6 - bit)) & 3;
if (!bit_group) {
if (!type) {
write_bit(0);
} else if (type == 1) {
nums++;
} else {
write_data_packet(bit_groups, index);
write_bit(0);
write_bit(0);
}
type = 1;
memset(bit_groups, 0, COUNTOF(bit_groups));
index = 0;
} else {
if (!type) {
write_bit(1);
} else if (type == 1) {
rle_encode_number(nums);
}
type = 2;
bit_groups[index++] = bit_group;
nums = 0;
}
}
}
}
if (type == 1) {
rle_encode_number(nums);
} else {
write_data_packet(bit_groups, index);
}
if (!plane) {
if (mode < 2) {
write_bit(0);
} else {
write_bit(1);
write_bit(mode - 2);
}
}
}
free(_plane1);
free(_plane2);
return (cur_byte + 1) * 8 + cur_bit;
}
int compress(uint8_t *data, int width) {
int ram_size = width * width * 8;
uint8_t *plane1 = xmalloc(ram_size);
uint8_t *plane2 = xmalloc(ram_size);
for (int i = 0; i < ram_size; i++) {
plane1[i] = data[i * 2];
plane2[i] = data[i * 2 + 1];
}
uint8_t current[COUNTOF(compressed)] = {0};
int compressed_size = -1;
for (int mode = 1; mode < 4; mode++) {
for (int order = 0; order < 2; order++) {
if (mode == 1 && order == 0) {
continue;
}
int new_size = interpret_compress(plane1, plane2, mode, order, width);
if (compressed_size == -1 || new_size < compressed_size) {
compressed_size = new_size;
memset(current, 0, COUNTOF(current));
memcpy(current, compressed, compressed_size / 8);
}
}
}
memset(compressed, 0, COUNTOF(compressed));
memcpy(compressed, current, compressed_size / 8);
free(plane1);
free(plane2);
return compressed_size / 8;
}
uint8_t *transpose_tiles(uint8_t *data, int width) {
int size = width * width * 0x10;
uint8_t *transposed = xmalloc(size);
for (int i = 0; i < size; i++) {
int j = (i / 0x10) * width * 0x10;
j = (j % size) + 0x10 * (j / size) + (i % 0x10);
transposed[j] = data[i];
}
free(data);
return transposed;
}
int main(int argc, char *argv[]) {
if (argc != 3) {
usage_exit(1);
}
long filesize;
uint8_t *data = read_u8(argv[1], &filesize);
int width = 0;
for (int w = 1; w < 16; w++) {
if (filesize == w * w * 0x10) {
width = w;
break;
}
}
if (!width) {
error_exit("Image is not a square, or is larger than 15x15 tiles");
}
data = transpose_tiles(data, width);
int compressed_size = compress(data, width);
write_u8(argv[2], compressed, compressed_size);
free(data);
return 0;
}