115 lines
3.7 KiB
Python
115 lines
3.7 KiB
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Генератор Deep Zoom Image (DZI) тайлов из PNG для быстрого просмотра больших чертежей.
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Использует PIL — не требует внешних зависимостей.
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Использование:
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python generate_dzi.py <png_file> [--tile-size 256] [--format png]
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Результат:
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<png_stem>.dzi — XML-дескриптор
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<png_stem>_files/ — папка с тайлами level/col_row.png
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"""
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import sys
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import os
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import math
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from pathlib import Path
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from PIL import Image
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def generate_dzi(png_path: Path, tile_size: int = 256, fmt: str = "png"):
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"""Генерирует DZI тайлы из PNG."""
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png_path = Path(png_path)
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if not png_path.exists():
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print(f"[ERR] Файл не найден: {png_path}")
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sys.exit(1)
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base = png_path.stem
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files_dir = png_path.parent / f"{base}_files"
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files_dir.mkdir(exist_ok=True)
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print(f"[INFO] Открываем {png_path}...")
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img = Image.open(png_path)
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orig_w, orig_h = img.size
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print(f"[INFO] Размер: {orig_w}x{orig_h}")
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# DZI uses power-of-2 levels, starting from 1x1 at level 0
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max_dim = max(orig_w, orig_h)
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max_level = math.ceil(math.log2(max_dim))
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print(f"[INFO] Уровней: {max_level + 1} (0..{max_level})")
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# Process from largest to smallest (build pyramid top-down)
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current = img.convert("RGBA" if fmt == "png" else "RGB")
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for level in range(max_level, -1, -1):
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# Calculate size at this level
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scale = 2 ** (max_level - level)
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level_w = math.ceil(orig_w / scale)
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level_h = math.ceil(orig_h / scale)
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# Resize current image to level size
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if current.size != (level_w, level_h):
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current = current.resize((level_w, level_h), Image.LANCZOS)
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# Save tiles
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cols = math.ceil(level_w / tile_size)
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rows = math.ceil(level_h / tile_size)
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level_dir = files_dir / str(level)
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level_dir.mkdir(exist_ok=True)
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for row in range(rows):
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for col in range(cols):
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x = col * tile_size
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y = row * tile_size
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w = min(tile_size, level_w - x)
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h = min(tile_size, level_h - y)
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tile = current.crop((x, y, x + w, y + h))
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tile_path = level_dir / f"{col}_{row}.{fmt}"
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if fmt == "png":
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tile.save(tile_path, "PNG", compress_level=3)
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else:
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tile.save(tile_path, "JPEG", quality=85)
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print(f" Level {level}: {level_w}x{level_h}, {cols}x{rows} tiles")
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# Write DZI descriptor
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dzi_path = png_path.parent / f"{base}.dzi"
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dzi_xml = f'''<?xml version="1.0" encoding="UTF-8"?>
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<Image xmlns="http://schemas.microsoft.com/deepzoom/2008"
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Format="{fmt}"
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Overlap="0"
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TileSize="{tile_size}">
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<Size Width="{orig_w}"
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Height="{orig_h}"/>
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</Image>'''
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dzi_path.write_text(dzi_xml, encoding="utf-8")
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print(f"[OK] DZI создан: {dzi_path}")
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print(f" Тайлы: {files_dir}")
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print(f" Уровней: {max_level + 1}, TileSize: {tile_size}")
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return dzi_path, files_dir
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def main():
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if len(sys.argv) < 2:
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print("Usage: python generate_dzi.py <png_file> [tile_size] [format]")
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sys.exit(1)
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png = Path(sys.argv[1])
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tile_size = int(sys.argv[2]) if len(sys.argv) > 2 else 256
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fmt = sys.argv[3] if len(sys.argv) > 3 else "png"
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generate_dzi(png, tile_size, fmt)
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if __name__ == "__main__":
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main()
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