Source code for PIL.ImageQt

#
# 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
#
# Copyright (c) 2006 by Secret Labs AB
# Copyright (c) 2006 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#

from PIL import Image

from PyQt4.QtGui import QImage, qRgb

##
# (Internal) Turns an RGB color into a Qt compatible color integer.

[docs]def rgb(r, g, b): # use qRgb to pack the colors, and then turn the resulting long # into a negative integer with the same bitpattern. return (qRgb(r, g, b) & 0xffffff) - 0x1000000 ## # An PIL image wrapper for Qt. This is a subclass of PyQt4's QImage # class. # # @param im A PIL Image object, or a file name (given either as Python # string or a PyQt string object).
[docs]class ImageQt(QImage): def __init__(self, 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? im = unicode(im.toUtf8(), "utf-8") if Image.isStringType(im): 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): 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() im = Image.merge("RGBA", (b, g, r, a)) format = QImage.Format_ARGB32 else: raise ValueError("unsupported image mode %r" % im.mode) # must keep a reference, or Qt will crash! self.__data = data or im.tobytes() QImage.__init__(self, self.__data, im.size[0], im.size[1], format) if colortable: self.setColorTable(colortable)