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"""The proxy class for an image part, and related objects."""
from __future__ import annotations
import hashlib
from typing import TYPE_CHECKING
from docx.image.image import Image
from docx.opc.part import Part
from docx.shared import Emu, Inches
if TYPE_CHECKING:
from docx.opc.package import OpcPackage
from docx.opc.packuri import PackURI
class ImagePart(Part):
"""An image part.
Corresponds to the target part of a relationship with type RELATIONSHIP_TYPE.IMAGE.
"""
def __init__(
self, partname: PackURI, content_type: str, blob: bytes, image: Image | None = None
):
super(ImagePart, self).__init__(partname, content_type, blob)
self._image = image
@property
def default_cx(self):
"""Native width of this image, calculated from its width in pixels and
horizontal dots per inch (dpi)."""
px_width = self.image.px_width
horz_dpi = self.image.horz_dpi
width_in_inches = px_width / horz_dpi
return Inches(width_in_inches)
@property
def default_cy(self):
"""Native height of this image, calculated from its height in pixels and
vertical dots per inch (dpi)."""
px_height = self.image.px_height
horz_dpi = self.image.horz_dpi
height_in_emu = int(round(914400 * px_height / horz_dpi))
return Emu(height_in_emu)
@property
def filename(self):
"""Filename from which this image part was originally created.
A generic name, e.g. 'image.png', is substituted if no name is available, for
example when the image was loaded from an unnamed stream. In that case a default
extension is applied based on the detected MIME type of the image.
"""
if self._image is not None:
return self._image.filename
return "image.%s" % self.partname.ext
@classmethod
def from_image(cls, image: Image, partname: PackURI):
"""Return an |ImagePart| instance newly created from `image` and assigned
`partname`."""
return ImagePart(partname, image.content_type, image.blob, image)
@property
def image(self) -> Image:
if self._image is None:
self._image = Image.from_blob(self.blob)
return self._image
@classmethod
def load(cls, partname: PackURI, content_type: str, blob: bytes, package: OpcPackage):
"""Called by ``docx.opc.package.PartFactory`` to load an image part from a
package being opened by ``Document(...)`` call."""
return cls(partname, content_type, blob)
@property
def sha1(self):
"""SHA1 hash digest of the blob of this image part."""
return hashlib.sha1(self.blob).hexdigest()
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