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80 lines
3.4 KiB
80 lines
3.4 KiB
from typing import List
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import os
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import shutil
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import subprocess
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from PIL import Image
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class ImageProcessor:
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def __init__(self, public_dir: str, web_path: str, *lookup_dirs: List[str]):
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self.public_dir = public_dir
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self.lookup_dirs = lookup_dirs
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self.web_path = web_path if web_path[-1] != "/" else web_path[:-1]
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if not os.path.exists(self.public_dir):
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os.mkdir(self.public_dir)
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def process_image(self, input_filename: str, format: str, source_dir: str, relative: bool=True, width: int=None, height:int=None, quality: int=None, dpi: int=None, fit: bool=True) -> str:
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name = os.path.basename(input_filename)
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base, ext = os.path.splitext(name)
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ext = ext[1:]
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full_path = self.find_image(input_filename, [source_dir])
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if full_path is None:
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raise FileNotFoundError(f'Image {input_filename} not found.')
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# Generate filename from arguments
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suffix = ""
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geometry = None
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if width is not None or height is not None:
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geometry = f'{width if width is not None else ""}x{height if height is not None else ""}{"" if fit else "!"}'
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suffix += "_"+geometry
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if quality is not None:
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suffix += f'_q{quality}'
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target_name = base+suffix+"."+format
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target_path = self.public_dir + "/" + target_name
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# Only regenerate if the file doesn't already exist.
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if not os.path.isfile(target_path):
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# If the format is the same or it is just a different extension for
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# the same format, just copy it.
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if (((ext == format)
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or (ext == "epdf" and format == "pdf")
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or (ext == "jpg" and format == "jpeg"))
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and width is None and height is None and quality is None and dpi is None):
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shutil.copyfile(full_path, target_path)
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# Try to find the converted filename in lookup_dirs, if you find
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# it, don't convert, just copy.
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elif self.find_image(target_name, [source_dir]):
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shutil.copyfile(self.find_image(target_name, [source_dir]), target_path)
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# Convert SVGs using inkscape
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elif ext == "svg":
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width_arg = ['--export-width', str(width)] if width is not None else []
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height_arg = ['--export-height', str(height)] if height is not None else []
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dpi_arg = ['--export-dpi', str(dpi)] if dpi is not None else []
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if subprocess.run(['inkscape', full_path, '-o', target_path, *width_arg, *height_arg, *dpi_arg]).returncode != 0:
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raise Exception(f"Could not convert '{full_path}' to '{format}'")
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# Convert everything else using ImageMagick.
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else:
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resize_arg = ['-resize', str(geometry)] if geometry is not None else []
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density_arg = ['-density', str(dpi)] if dpi is not None else []
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quality_arg = ['-quality', str(quality)] if quality is not None else []
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if subprocess.run(['convert', *density_arg, full_path, *resize_arg, *quality_arg, target_path]).returncode != 0:
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raise Exception(f"Could not convert '{full_path}' to '{format}'")
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return target_name if relative else target_path
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def get_image_size(self, input_filename: str, additional_dirs: List[str]=[]) -> (int, int):
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full_path = self.find_image(input_filename, additional_dirs)
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if full_path is None:
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raise FileNotFoundError(f'Image {input_filename} not found.')
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# Getting image size using ImageMagick is slow. VERY
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return Image.open(full_path).size
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def find_image(self, input_filename: str, additional_dirs: List[str]=[]) -> str:
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for dir in [*self.lookup_dirs, *additional_dirs]:
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if os.path.isfile(dir + "/" + input_filename):
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return dir + "/" + input_filename
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