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217 lines
6.6 KiB
Python
217 lines
6.6 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# a simple Qt image interface.
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#
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# history:
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# 2006-06-03 fl: created
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# 2006-06-04 fl: inherit from QImage instead of wrapping it
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# 2006-06-05 fl: removed toimage helper; move string support to ImageQt
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# 2013-11-13 fl: add support for Qt5 (aurelien.ballier@cyclonit.com)
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#
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# Copyright (c) 2006 by Secret Labs AB
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# Copyright (c) 2006 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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from __future__ import annotations
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import sys
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from io import BytesIO
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from typing import TYPE_CHECKING, Any, Callable, Union
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from . import Image
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from ._util import is_path
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if TYPE_CHECKING:
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import PyQt6
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import PySide6
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from . import ImageFile
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QBuffer: type
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QByteArray = Union[PyQt6.QtCore.QByteArray, PySide6.QtCore.QByteArray]
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QIODevice = Union[PyQt6.QtCore.QIODevice, PySide6.QtCore.QIODevice]
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QImage = Union[PyQt6.QtGui.QImage, PySide6.QtGui.QImage]
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QPixmap = Union[PyQt6.QtGui.QPixmap, PySide6.QtGui.QPixmap]
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qt_version: str | None
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qt_versions = [
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["6", "PyQt6"],
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["side6", "PySide6"],
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]
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# If a version has already been imported, attempt it first
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qt_versions.sort(key=lambda version: version[1] in sys.modules, reverse=True)
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for version, qt_module in qt_versions:
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try:
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qRgba: Callable[[int, int, int, int], int]
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if qt_module == "PyQt6":
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from PyQt6.QtCore import QBuffer, QIODevice
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from PyQt6.QtGui import QImage, QPixmap, qRgba
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elif qt_module == "PySide6":
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from PySide6.QtCore import QBuffer, QIODevice
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from PySide6.QtGui import QImage, QPixmap, qRgba
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except (ImportError, RuntimeError):
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continue
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qt_is_installed = True
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qt_version = version
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break
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else:
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qt_is_installed = False
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qt_version = None
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def rgb(r: int, g: int, b: int, a: int = 255) -> int:
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"""(Internal) Turns an RGB color into a Qt compatible color integer."""
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# use qRgb to pack the colors, and then turn the resulting long
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# into a negative integer with the same bitpattern.
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return qRgba(r, g, b, a) & 0xFFFFFFFF
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def fromqimage(im: QImage | QPixmap) -> ImageFile.ImageFile:
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"""
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:param im: QImage or PIL ImageQt object
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"""
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buffer = QBuffer()
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qt_openmode: object
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if qt_version == "6":
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try:
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qt_openmode = getattr(QIODevice, "OpenModeFlag")
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except AttributeError:
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qt_openmode = getattr(QIODevice, "OpenMode")
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else:
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qt_openmode = QIODevice
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buffer.open(getattr(qt_openmode, "ReadWrite"))
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# preserve alpha channel with png
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# otherwise ppm is more friendly with Image.open
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if im.hasAlphaChannel():
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im.save(buffer, "png")
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else:
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im.save(buffer, "ppm")
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b = BytesIO()
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b.write(buffer.data())
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buffer.close()
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b.seek(0)
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return Image.open(b)
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def fromqpixmap(im: QPixmap) -> ImageFile.ImageFile:
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return fromqimage(im)
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def align8to32(bytes: bytes, width: int, mode: str) -> bytes:
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"""
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converts each scanline of data from 8 bit to 32 bit aligned
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"""
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bits_per_pixel = {"1": 1, "L": 8, "P": 8, "I;16": 16}[mode]
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# calculate bytes per line and the extra padding if needed
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bits_per_line = bits_per_pixel * width
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full_bytes_per_line, remaining_bits_per_line = divmod(bits_per_line, 8)
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bytes_per_line = full_bytes_per_line + (1 if remaining_bits_per_line else 0)
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extra_padding = -bytes_per_line % 4
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# already 32 bit aligned by luck
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if not extra_padding:
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return bytes
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new_data = [
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bytes[i * bytes_per_line : (i + 1) * bytes_per_line] + b"\x00" * extra_padding
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for i in range(len(bytes) // bytes_per_line)
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]
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return b"".join(new_data)
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def _toqclass_helper(im: Image.Image | str | QByteArray) -> dict[str, Any]:
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data = None
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colortable = None
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exclusive_fp = False
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# handle filename, if given instead of image name
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if hasattr(im, "toUtf8"):
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# FIXME - is this really the best way to do this?
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im = str(im.toUtf8(), "utf-8")
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if is_path(im):
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im = Image.open(im)
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exclusive_fp = True
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assert isinstance(im, Image.Image)
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qt_format = getattr(QImage, "Format") if qt_version == "6" else QImage
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if im.mode == "1":
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format = getattr(qt_format, "Format_Mono")
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elif im.mode == "L":
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format = getattr(qt_format, "Format_Indexed8")
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colortable = [rgb(i, i, i) for i in range(256)]
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elif im.mode == "P":
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format = getattr(qt_format, "Format_Indexed8")
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palette = im.getpalette()
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assert palette is not None
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colortable = [rgb(*palette[i : i + 3]) for i in range(0, len(palette), 3)]
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elif im.mode == "RGB":
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# Populate the 4th channel with 255
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im = im.convert("RGBA")
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data = im.tobytes("raw", "BGRA")
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format = getattr(qt_format, "Format_RGB32")
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elif im.mode == "RGBA":
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data = im.tobytes("raw", "BGRA")
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format = getattr(qt_format, "Format_ARGB32")
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elif im.mode == "I;16":
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im = im.point(lambda i: i * 256)
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format = getattr(qt_format, "Format_Grayscale16")
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else:
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if exclusive_fp:
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im.close()
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msg = f"unsupported image mode {repr(im.mode)}"
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raise ValueError(msg)
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size = im.size
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__data = data or align8to32(im.tobytes(), size[0], im.mode)
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if exclusive_fp:
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im.close()
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return {"data": __data, "size": size, "format": format, "colortable": colortable}
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if qt_is_installed:
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class ImageQt(QImage): # type: ignore[misc]
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def __init__(self, im: Image.Image | str | QByteArray) -> None:
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"""
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An PIL image wrapper for Qt. This is a subclass of PyQt's QImage
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class.
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:param im: A PIL Image object, or a file name (given either as
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Python string or a PyQt string object).
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"""
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im_data = _toqclass_helper(im)
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# must keep a reference, or Qt will crash!
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# All QImage constructors that take data operate on an existing
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# buffer, so this buffer has to hang on for the life of the image.
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# Fixes https://github.com/python-pillow/Pillow/issues/1370
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self.__data = im_data["data"]
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super().__init__(
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self.__data,
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im_data["size"][0],
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im_data["size"][1],
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im_data["format"],
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)
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if im_data["colortable"]:
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self.setColorTable(im_data["colortable"])
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def toqimage(im: Image.Image | str | QByteArray) -> ImageQt:
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return ImageQt(im)
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def toqpixmap(im: Image.Image | str | QByteArray) -> QPixmap:
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qimage = toqimage(im)
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return getattr(QPixmap, "fromImage")(qimage)
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