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Diffstat (limited to 'silx/gui/utils/image.py')
| -rw-r--r-- | silx/gui/utils/image.py | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/silx/gui/utils/image.py b/silx/gui/utils/image.py deleted file mode 100644 index 3ac737f..0000000 --- a/silx/gui/utils/image.py +++ /dev/null @@ -1,143 +0,0 @@ -# coding: utf-8 -# /*########################################################################## -# -# Copyright (c) 2017-2018 European Synchrotron Radiation Facility -# -# Permission is hereby granted, free of charge, to any person obtaining a copy -# of this software and associated documentation files (the "Software"), to deal -# in the Software without restriction, including without limitation the rights -# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell -# copies of the Software, and to permit persons to whom the Software is -# furnished to do so, subject to the following conditions: -# -# The above copyright notice and this permission notice shall be included in -# all copies or substantial portions of the Software. -# -# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN -# THE SOFTWARE. -# -# ###########################################################################*/ -"""This module provides conversions between numpy.ndarray and QImage - -- :func:`convertArrayToQImage` -- :func:`convertQImageToArray` -""" - -from __future__ import division - - -__authors__ = ["T. Vincent"] -__license__ = "MIT" -__date__ = "04/09/2018" - - -import sys -import numpy -from numpy.lib.stride_tricks import as_strided as _as_strided - -from .. import qt - - -def convertArrayToQImage(array): - """Convert an array-like image to a QImage. - - The created QImage is using a copy of the array data. - - Limitation: Only RGB or RGBA images with 8 bits per channel are supported. - - :param array: Array-like image data of shape (height, width, channels) - Channels are expected to be either RGB or RGBA. - :type array: numpy.ndarray of uint8 - :return: Corresponding Qt image with RGB888 or ARGB32 format. - :rtype: QImage - """ - array = numpy.array(array, copy=False, order='C', dtype=numpy.uint8) - - if array.ndim != 3 or array.shape[2] not in (3, 4): - raise ValueError( - 'Image must be a 3D array with 3 or 4 channels per pixel') - - if array.shape[2] == 4: - format_ = qt.QImage.Format_ARGB32 - # RGBA -> ARGB + take care of endianness - if sys.byteorder == 'little': # RGBA -> BGRA - array = array[:, :, (2, 1, 0, 3)] - else: # big endian: RGBA -> ARGB - array = array[:, :, (3, 0, 1, 2)] - - array = numpy.array(array, order='C') # Make a contiguous array - - else: # array.shape[2] == 3 - format_ = qt.QImage.Format_RGB888 - - height, width, depth = array.shape - qimage = qt.QImage( - array.data, - width, - height, - array.strides[0], # bytesPerLine - format_) - - return qimage.copy() # Making a copy of the image and its data - - -def convertQImageToArray(image): - """Convert a QImage to a numpy array. - - If QImage format is not Format_RGB888, Format_RGBA8888 or Format_ARGB32, - it is first converted to one of this format depending on - the presence of an alpha channel. - - The created numpy array is using a copy of the QImage data. - - :param QImage image: The QImage to convert. - :return: The image array of RGB or RGBA channels of shape - (height, width, channels (3 or 4)) - :rtype: numpy.ndarray of uint8 - """ - rgba8888 = getattr(qt.QImage, 'Format_RGBA8888', None) # Only in Qt5 - - # Convert to supported format if needed - if image.format() not in (qt.QImage.Format_ARGB32, - qt.QImage.Format_RGB888, - rgba8888): - if image.hasAlphaChannel(): - image = image.convertToFormat( - rgba8888 if rgba8888 is not None else qt.QImage.Format_ARGB32) - else: - image = image.convertToFormat(qt.QImage.Format_RGB888) - - format_ = image.format() - channels = 3 if format_ == qt.QImage.Format_RGB888 else 4 - - ptr = image.bits() - if qt.BINDING not in ('PySide', 'PySide2'): - ptr.setsize(image.byteCount()) - if qt.BINDING == 'PyQt4' and sys.version_info[0] == 2: - ptr = ptr.asstring() - elif sys.version_info[0] == 3: # PySide with Python3 - ptr = ptr.tobytes() - - # Create an array view on QImage internal data - view = _as_strided( - numpy.frombuffer(ptr, dtype=numpy.uint8), - shape=(image.height(), image.width(), channels), - strides=(image.bytesPerLine(), channels, 1)) - - if format_ == qt.QImage.Format_ARGB32: - # Convert from ARGB to RGBA - # Not a byte-ordered format: do care about endianness - if sys.byteorder == 'little': # BGRA -> RGBA - view = view[:, :, (2, 1, 0, 3)] - else: # big endian: ARGB -> RGBA - view = view[:, :, (1, 2, 3, 0)] - - # Format_RGB888 and Format_RGBA8888 do not need reshuffling channels: - # They are byte-ordered and already in the right order - - return numpy.array(view, copy=True, order='C') |