218 lines
6.4 KiB
Python
218 lines
6.4 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 . import Image
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from ._util import isPath, py3
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from io import BytesIO
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import sys
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qt_versions = [
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['5', 'PyQt5'],
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['side2', 'PySide2'],
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['4', 'PyQt4'],
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['side', 'PySide']
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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,
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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 == 'PyQt5':
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from PyQt5.QtGui import QImage, qRgba, QPixmap
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from PyQt5.QtCore import QBuffer, QIODevice
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elif qt_module == 'PySide2':
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from PySide2.QtGui import QImage, qRgba, QPixmap
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from PySide2.QtCore import QBuffer, QIODevice
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elif qt_module == 'PyQt4':
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from PyQt4.QtGui import QImage, qRgba, QPixmap
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from PyQt4.QtCore import QBuffer, QIODevice
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elif qt_module == 'PySide':
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from PySide.QtGui import QImage, qRgba, QPixmap
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from PySide.QtCore import QBuffer, QIODevice
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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: A PIL Image object, or a file name
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(given either as Python string or a PyQt string object)
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"""
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buffer = QBuffer()
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buffer.open(QIODevice.ReadWrite)
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# preserve alha 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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try:
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b.write(buffer.data())
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except TypeError:
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# workaround for Python 2
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b.write(str(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 = {
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'1': 1,
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'L': 8,
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'P': 8,
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}[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(bytes[i*bytes_per_line:(i+1)*bytes_per_line]
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+ b'\x00' * extra_padding)
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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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# 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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if py3:
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im = str(im.toUtf8(), "utf-8")
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else:
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im = unicode(im.toUtf8(), "utf-8") # noqa: F821
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if isPath(im):
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im = Image.open(im)
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if im.mode == "1":
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format = QImage.Format_Mono
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elif im.mode == "L":
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format = QImage.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 = QImage.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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data = im.tobytes("raw", "BGRX")
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format = QImage.Format_RGB32
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elif im.mode == "RGBA":
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try:
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data = im.tobytes("raw", "BGRA")
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except SystemError:
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# workaround for earlier versions
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r, g, b, a = im.split()
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im = Image.merge("RGBA", (b, g, r, a))
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format = QImage.Format_ARGB32
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else:
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raise ValueError("unsupported image mode %r" % im.mode)
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__data = data or align8to32(im.tobytes(), im.size[0], im.mode)
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return {
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'data': __data, 'im': im, 'format': format, 'colortable': colortable
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}
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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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QImage.__init__(self,
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self.__data, im_data['im'].size[0],
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im_data['im'].size[1], im_data['format'])
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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['im'].size[0], im_data['im'].size[1])
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# result.loadFromData(im_data['data'])
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# Fix some strange bug that causes
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if im.mode == 'RGB':
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im = im.convert('RGBA')
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qimage = toqimage(im)
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return QPixmap.fromImage(qimage)
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