Pillow/src/PIL/ImageQt.py

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#
# The Python Imaging Library.
# $Id$
#
# a simple Qt image interface.
#
# history:
# 2006-06-03 fl: created
# 2006-06-04 fl: inherit from QImage instead of wrapping it
# 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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#
# Copyright (c) 2006 by Secret Labs AB
# Copyright (c) 2006 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
import sys
from io import BytesIO
from . import Image
from ._util import isPath, py3
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qt_versions = [["5", "PyQt5"], ["side2", "PySide2"]]
# 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)
for qt_version, qt_module in qt_versions:
try:
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if qt_module == "PyQt5":
from PyQt5.QtGui import QImage, qRgba, QPixmap
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
from PySide2.QtCore import QBuffer, QIODevice
except (ImportError, RuntimeError):
continue
qt_is_installed = True
break
else:
qt_is_installed = False
qt_version = None
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def rgb(r, g, b, a=255):
"""(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
# 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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"""
:param im: A PIL Image object, or a file name
(given either as Python string or a PyQt string object)
"""
buffer = QBuffer()
buffer.open(QIODevice.ReadWrite)
# preserve alpha channel with png
# otherwise ppm is more friendly with Image.open
if im.hasAlphaChannel():
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im.save(buffer, "png")
else:
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im.save(buffer, "ppm")
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b = BytesIO()
try:
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b.write(buffer.data())
except TypeError:
# workaround for Python 2
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b.write(str(buffer.data()))
buffer.close()
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b.seek(0)
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return Image.open(b)
def fromqpixmap(im):
return fromqimage(im)
# buffer = QBuffer()
# buffer.open(QIODevice.ReadWrite)
# # im.save(buffer)
# # What if png doesn't support some image features like animation?
# im.save(buffer, 'ppm')
# bytes_io = BytesIO()
# bytes_io.write(buffer.data())
# buffer.close()
# bytes_io.seek(0)
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# return Image.open(bytes_io)
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def align8to32(bytes, width, mode):
"""
converts each scanline of data from 8 bit to 32 bit aligned
"""
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bits_per_pixel = {"1": 1, "L": 8, "P": 8}[mode]
# calculate bytes per line and the extra padding if needed
bits_per_line = bits_per_pixel * width
full_bytes_per_line, remaining_bits_per_line = divmod(bits_per_line, 8)
bytes_per_line = full_bytes_per_line + (1 if remaining_bits_per_line else 0)
extra_padding = -bytes_per_line % 4
# already 32 bit aligned by luck
if not extra_padding:
return bytes
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]
+ b"\x00" * extra_padding
)
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return b"".join(new_data)
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def _toqclass_helper(im):
data = None
colortable = None
# handle filename, if given instead of image name
if hasattr(im, "toUtf8"):
# FIXME - is this really the best way to do this?
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if py3:
im = str(im.toUtf8(), "utf-8")
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else:
im = unicode(im.toUtf8(), "utf-8") # noqa: F821
if isPath(im):
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im = Image.open(im)
if im.mode == "1":
format = QImage.Format_Mono
elif im.mode == "L":
format = QImage.Format_Indexed8
colortable = []
for i in range(256):
colortable.append(rgb(i, i, i))
elif im.mode == "P":
format = QImage.Format_Indexed8
colortable = []
palette = im.getpalette()
for i in range(0, len(palette), 3):
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colortable.append(rgb(*palette[i : i + 3]))
elif im.mode == "RGB":
data = im.tobytes("raw", "BGRX")
format = QImage.Format_RGB32
elif im.mode == "RGBA":
try:
data = im.tobytes("raw", "BGRA")
except SystemError:
# workaround for earlier versions
r, g, b, a = im.split()
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im = Image.merge("RGBA", (b, g, r, a))
format = QImage.Format_ARGB32
else:
raise ValueError("unsupported image mode %r" % im.mode)
__data = data or align8to32(im.tobytes(), im.size[0], im.mode)
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return {"data": __data, "im": im, "format": format, "colortable": colortable}
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if qt_is_installed:
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class ImageQt(QImage):
def __init__(self, im):
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"""
An PIL image wrapper for Qt. This is a subclass of PyQt's QImage
class.
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:param im: A PIL Image object, or a file name (given either as
Python string or a PyQt string object).
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"""
im_data = _toqclass_helper(im)
# must keep a reference, or Qt will crash!
# All QImage constructors that take data operate on an existing
# buffer, so this buffer has to hang on for the life of the image.
# Fixes https://github.com/python-pillow/Pillow/issues/1370
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self.__data = im_data["data"]
QImage.__init__(
self,
self.__data,
im_data["im"].size[0],
im_data["im"].size[1],
im_data["format"],
)
if im_data["colortable"]:
self.setColorTable(im_data["colortable"])
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def toqimage(im):
return ImageQt(im)
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)
# result = QPixmap(im_data['im'].size[0], im_data['im'].size[1])
# result.loadFromData(im_data['data'])
# Fix some strange bug that causes
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if im.mode == "RGB":
im = im.convert("RGBA")
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qimage = toqimage(im)
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return QPixmap.fromImage(qimage)