Created
March 24, 2026 06:29
-
-
Save hsk/0a769426f26993442f80cceb07f03d29 to your computer and use it in GitHub Desktop.
japan map rle
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| from PIL import Image | |
| def load_binary_image(path): | |
| img = Image.open(path).convert("1") # 2値化 | |
| w, h = img.size | |
| pixels = img.load() | |
| data = [] | |
| for y in range(h): | |
| byte = 0 | |
| bit_count = 0 | |
| for x in range(w): | |
| bit = 1 if pixels[x, y] == 0 else 0 # 黒=1 | |
| byte = (byte << 1) | bit | |
| bit_count += 1 | |
| if bit_count == 8: | |
| data.append(byte) | |
| byte = 0 | |
| bit_count = 0 | |
| if bit_count != 0: | |
| byte <<= (8 - bit_count) | |
| data.append(byte) | |
| return data | |
| def rle_compress(data): | |
| out = [] | |
| i = 0 | |
| while i < len(data): | |
| val = data[i] | |
| count = 1 | |
| while i + count < len(data) and data[i + count] == val and count < 255: | |
| count += 1 | |
| out.append(count) | |
| out.append(val) | |
| i += count | |
| return bytes(out) | |
| if __name__ == "__main__": | |
| data = load_binary_image("japan2.png") | |
| comp = rle_compress(data) | |
| with open("bitmap_rle.bin", "wb") as f: | |
| f.write(comp) | |
| print("raw:", len(data), "compressed:", len(comp)) |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| from PIL import Image | |
| TILE_SIZE = 8 | |
| def get_tile(img, tx, ty): | |
| tile = [] | |
| pixels = img.load() | |
| for y in range(TILE_SIZE): | |
| byte = 0 | |
| for x in range(TILE_SIZE): | |
| px = tx * TILE_SIZE + x | |
| py = ty * TILE_SIZE + y | |
| bit = 1 if pixels[px, py] == 0 else 0 | |
| byte = (byte << 1) | bit | |
| tile.append(byte) | |
| return tuple(tile) | |
| def extract_tiles(img): | |
| w, h = img.size | |
| tiles = [] | |
| tilemap = [] | |
| tile_dict = {} | |
| tile_list = [] | |
| for ty in range(h // TILE_SIZE): | |
| for tx in range(w // TILE_SIZE): | |
| t = get_tile(img, tx, ty) | |
| if t not in tile_dict: | |
| tile_dict[t] = len(tile_list) | |
| tile_list.append(t) | |
| tilemap.append(tile_dict[t]) | |
| return tile_list, tilemap | |
| def save_tiles(tile_list, tilemap): | |
| # --- タイルをRLE圧縮して保存 --- | |
| def flatten_tiles(tile_list): | |
| data = [] | |
| for t in tile_list: | |
| data.extend(t) | |
| return data | |
| def rle_compress(data): | |
| out = [] | |
| i = 0 | |
| while i < len(data): | |
| val = data[i] | |
| count = 1 | |
| while i + count < len(data) and data[i + count] == val and count < 255: | |
| count += 1 | |
| out.append(count) | |
| out.append(val) | |
| i += count | |
| return bytes(out) | |
| raw_tiles = flatten_tiles(tile_list) | |
| comp_tiles = rle_compress(raw_tiles) | |
| with open("tiles_rle.bin", "wb") as f: | |
| f.write(comp_tiles) | |
| # --- tilemapをRLE圧縮（16bit値）して保存 --- | |
| def rle_compress_16(data): | |
| out = [] | |
| i = 0 | |
| while i < len(data): | |
| val = data[i] | |
| count = 1 | |
| while i + count < len(data) and data[i + count] == val and count < 255: | |
| count += 1 | |
| out.append(count) | |
| out.extend(val.to_bytes(2, "little")) | |
| i += count | |
| return bytes(out) | |
| comp_map = rle_compress_16(tilemap) | |
| with open("map_rle.bin", "wb") as f: | |
| f.write(comp_map) | |
| print("map raw:", len(tilemap) * 2) | |
| print("map compressed:", len(comp_map)) | |
| print("tiles raw:", len(raw_tiles)) | |
| print("tiles compressed:", len(comp_tiles)) | |
| print("all compressed size:",len(comp_map)+len(comp_tiles)) | |
| print("map compressed and raw tiles size:",len(comp_map)+len(raw_tiles)) | |
| if __name__ == "__main__": | |
| img = Image.open("japan2.png").convert("1") | |
| tiles, tilemap = extract_tiles(img) | |
| print("unique tiles:", len(tiles),"size:",len(tiles)*8) | |
| print("map size:", len(tilemap),"size:",len(tilemap)*2) | |
| print("all size:",len(tiles)*8+len(tilemap)*2) | |
| save_tiles(tiles, tilemap) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment