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250 lines
8.3 KiB
250 lines
8.3 KiB
from typing import Union
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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 FileInWrongDirError(Exception):
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pass
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class ConversionProgramError(Exception):
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pass
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class InkscapeError(ConversionProgramError):
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pass
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class ImageMagickError(ConversionProgramError):
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pass
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class AsyError(ConversionProgramError):
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pass
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class ImageProcessorNamespace:
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public_dir: str
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cache_dir: str
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lookup_dirs: list[str]
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web_path: str
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include_src: bool
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def __init__(self, public_dir: str, web_path: str, cache_dir: str, lookup_dirs: list[str], include_src: bool):
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self.public_dir = public_dir
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self.cache_dir = cache_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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self.include_src = include_src
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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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if not os.path.exists(self.cache_dir):
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os.mkdir(self.cache_dir)
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class ImageProcessorSearcher:
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def get_lookup_dirs(self) -> list[str]:
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return []
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def get_cache_dir(self) -> str:
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return ""
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def get_public_dir(self) -> str:
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return ""
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def get_web_path(self) -> str:
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return ""
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def find_image_in_dir(self, input_filename: str, dir: str) -> Union[str, None]:
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if os.path.isfile(dir + "/" + input_filename):
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return dir + "/" + input_filename
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else:
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return None
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def find_image(self, input_filename: str) -> Union[str, None]:
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for dir in self.get_lookup_dirs():
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image = self.find_image_in_dir(input_filename, dir)
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if image:
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return image
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return None
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def publish_image(self, target_name, relative: bool=True) -> str:
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cache_path = self.get_cache_dir() + "/" + target_name
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if not os.path.isfile(cache_path):
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raise FileNotFoundError(f'Image {target_name} not cached')
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target_path = self.get_public_dir() + "/" + target_name
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try:
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if os.path.exists(target_path):
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if os.path.getmtime(cache_path) > os.path.getmtime(target_path):
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os.remove(target_path)
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os.link(cache_path, target_path)
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else:
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os.link(cache_path, target_path)
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except OSError as e:
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if e.errno == 18: # Invalid cross-device link: cache and public dirs are on different devices, don't hardlink, copy
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shutil.copyfile(cache_path, target_path)
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else:
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raise e
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return target_name if relative else target_path
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class ImageProcessorCacheSearcher(ImageProcessorSearcher):
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cache_dir: str
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def __init__(self, cache_dir: str):
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self.cache_dir = cache_dir
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def get_lookup_dirs(self) -> list[str]:
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return [self.cache_dir]
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def get_cache_dir(self) -> str:
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return self.cache_dir
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def get_public_dir(self) -> str:
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return ""
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def get_web_path(self) -> str:
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return ""
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def publish_image(self, target_name, relative: bool=True) -> str:
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raise NotImplementedError();
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class ImageProcessorNamespaceSearcher(ImageProcessorSearcher):
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namespace: ImageProcessorNamespace
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rel_dir: str
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source_dir: str
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def __init__(self, namespace: ImageProcessorNamespace, rel_dir: str, source_dir: str):
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self.namespace = namespace
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self.rel_dir = rel_dir
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self.source_dir = source_dir
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def get_lookup_dirs(self) -> list[str]:
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return self.namespace.lookup_dirs + ([self.source_dir] if self.namespace.include_src else [])
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def transform_path(self, path: str) -> str:
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return path.replace("$dir", self.rel_dir)
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def get_cache_dir(self) -> str:
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return self.transform_path(self.namespace.cache_dir)
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def get_public_dir(self) -> str:
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return self.transform_path(self.namespace.public_dir)
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def get_web_path(self) -> str:
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return self.transform_path(self.namespace.web_path)
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def get_cache_searcher(self) -> ImageProcessorCacheSearcher:
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return ImageProcessorCacheSearcher(self.get_cache_dir())
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class ImageProcessor:
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namespaces: dict[str, ImageProcessorNamespace]
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def __init__(self, namespaces: dict[str, ImageProcessorNamespace]):
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self.namespaces = namespaces
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def get_namespace_by_path(self, path: str) -> ImageProcessorNamespace:
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return self.namespaces[path.split(":")[0] if ":" in path else ""]
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def get_path_without_namespace(self, path: str) -> str:
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if len(path.split(":")) <= 1:
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return path
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return ":".join(path.split(":")[1:])
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def get_searcher_by_path(self, path: str, rel_dir: str, source_dir: str) -> ImageProcessorNamespaceSearcher:
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return ImageProcessorNamespaceSearcher(self.get_namespace_by_path(path), rel_dir, source_dir)
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def process_image(self, input_filename: str, format: str, searcher: ImageProcessorSearcher, width: int=None, height:int=None, quality: int=None, dpi: int=None, fit: bool=True, deps: list[str]=[]) -> 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 = searcher.find_image(input_filename)
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if full_path is None:
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raise FileNotFoundError(f'Image {input_filename} not found in {searcher.get_lookup_dirs()}.')
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if format == "jpg":
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format = "jpeg"
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# Locate all dependencies
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deps_full = [full_path]
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for dep in deps:
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dep_full_path = searcher.find_image(dep)
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if dep_full_path is None:
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raise FileNotFoundError(f'Image dependency {dep} not found.')
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deps_full.append(dep_full_path)
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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 = searcher.get_cache_dir() + "/" + target_name
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# Only regenerate if the file doesn't already exist and no dependencies are newer
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if not os.path.isfile(target_path) or self.is_outdated(target_path, deps_full):
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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 searcher.find_image(target_name) is not None and not self.is_outdated(searcher.find_image(target_name), deps):
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shutil.copyfile(searcher.find_image(target_name), target_path)
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# Process asymptote
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elif ext == "asy":
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# Collect dependencies
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deps_dir = searcher.get_cache_dir() + "/" + name + "_deps"
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if not os.path.isdir(deps_dir):
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os.mkdir(deps_dir)
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for dep_full in deps_full:
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dep = os.path.basename(dep_full)
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if not os.path.isfile(deps_dir + "/" + dep) or os.path.getmtime(deps_dir + "/" + dep) < os.path.getmtime(dep_full):
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shutil.copyfile(dep_full, deps_dir + "/" + dep)
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dpi_arg = ['-render', str(dpi/72)] if dpi is not None else []
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if subprocess.run(['asy', name, '-o', target_name, '-f', format, *dpi_arg], cwd=deps_dir).returncode != 0:
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raise AsyError(f"Could not convert '{full_path}' to '{format}'")
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shutil.move(deps_dir + "/" + target_name, searcher.get_cache_dir() + "/" + target_name)
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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 InkscapeError(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 ImageMagickError(f"Could not convert '{full_path}' to '{format}'")
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return target_name
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def is_outdated(self, target: str, deps: list[str]):
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target_timestamp = os.path.getmtime(target)
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for dep in deps:
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dep_timestamp = os.path.getmtime(dep)
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if dep_timestamp > target_timestamp:
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return True
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return False
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def get_image_size(self, full_path: str) -> tuple[int, int]:
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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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