#
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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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#
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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 Image
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from PyQt4.QtGui import QImage, qRgb
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##
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# (Internal) Turns an RGB color into a Qt compatible color integer.
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def rgb(r, g, b):
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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 (qRgb(r, g, b) & 0xffffff) - 0x1000000
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##
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# An PIL image wrapper for Qt. This is a subclass of PyQt4's QImage
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# class.
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#
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# @param im A PIL Image object, or a file name (given either as Python
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# string or a PyQt string object).
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class ImageQt(QImage):
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def __init__(self, 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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im = unicode(im.toUtf8(), "utf-8")
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if Image.isStringType(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.tostring("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.tostring("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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# must keep a reference, or Qt will crash!
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self.__data = data or im.tostring()
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QImage.__init__(self, self.__data, im.size[0], im.size[1], format)
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if colortable:
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self.setColorTable(colortable)
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