217 lines
6.2 KiB
Python
217 lines
6.2 KiB
Python
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#
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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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import sys
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from io import BytesIO
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from . import Image
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from ._util import is_path
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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 qt_version: qt_version[1] in sys.modules, reverse=True)
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for qt_version, qt_module in qt_versions:
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try:
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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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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, g, b, a=255):
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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):
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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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if qt_version == "6":
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try:
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qt_openmode = QIODevice.OpenModeFlag
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except AttributeError:
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qt_openmode = QIODevice.OpenMode
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else:
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qt_openmode = QIODevice
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buffer.open(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):
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return fromqimage(im)
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# buffer = QBuffer()
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# buffer.open(QIODevice.ReadWrite)
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# # im.save(buffer)
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# # What if png doesn't support some image features like animation?
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# im.save(buffer, 'ppm')
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# bytes_io = BytesIO()
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# bytes_io.write(buffer.data())
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# buffer.close()
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# bytes_io.seek(0)
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# return Image.open(bytes_io)
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def align8to32(bytes, width, mode):
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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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for i in range(len(bytes) // bytes_per_line):
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new_data.append(
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bytes[i * bytes_per_line : (i + 1) * bytes_per_line]
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+ b"\x00" * extra_padding
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)
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return b"".join(new_data)
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def _toqclass_helper(im):
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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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qt_format = QImage.Format if qt_version == "6" else QImage
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if im.mode == "1":
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format = qt_format.Format_Mono
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elif im.mode == "L":
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format = qt_format.Format_Indexed8
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colortable = []
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for i in range(256):
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colortable.append(rgb(i, i, i))
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elif im.mode == "P":
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format = qt_format.Format_Indexed8
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colortable = []
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palette = im.getpalette()
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for i in range(0, len(palette), 3):
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colortable.append(rgb(*palette[i : i + 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 = 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 = qt_format.Format_ARGB32
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elif im.mode == "I;16" and hasattr(qt_format, "Format_Grayscale16"): # Qt 5.13+
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im = im.point(lambda i: i * 256)
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format = 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):
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def __init__(self, im):
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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):
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return ImageQt(im)
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def toqpixmap(im):
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# # This doesn't work. For now using a dumb approach.
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# im_data = _toqclass_helper(im)
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# result = QPixmap(im_data["size"][0], im_data["size"][1])
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# result.loadFromData(im_data["data"])
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qimage = toqimage(im)
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return QPixmap.fromImage(qimage)
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