Class around PixMap objects that allows more python-like access. By Joe Strout.
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Jack Jansen
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"""PixMapWrapper - defines the PixMapWrapper class, which wraps an opaque
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QuickDraw PixMap data structure in a handy Python class. Also provides
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methods to convert to/from pixel data (from, e.g., the img module) or a
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Python Imaging Library Image object.
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J. Strout <joe@strout.net> February 1999"""
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import Qd
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import QuickDraw
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import struct
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import MacOS
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import img
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import imgformat
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# PixMap data structure element format (as used with struct)
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_pmElemFormat = {
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'baseAddr':'l', # address of pixel data
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'rowBytes':'h', # bytes per row, plus 0x8000
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'bounds':'hhhh', # coordinates imposed over pixel data
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'top':'h',
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'left':'h',
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'bottom':'h',
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'right':'h',
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'pmVersion':'h', # flags for Color QuickDraw
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'packType':'h', # format of compression algorithm
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'packSize':'l', # size after compression
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'hRes':'l', # horizontal pixels per inch
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'vRes':'l', # vertical pixels per inch
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'pixelType':'h', # pixel format
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'pixelSize':'h', # bits per pixel
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'cmpCount':'h', # color components per pixel
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'cmpSize':'h', # bits per component
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'planeBytes':'l', # offset in bytes to next plane
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'pmTable':'l', # handle to color table
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'pmReserved':'l' # reserved for future use
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}
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# PixMap data structure element offset
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_pmElemOffset = {
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'baseAddr':0,
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'rowBytes':4,
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'bounds':6,
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'top':6,
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'left':8,
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'bottom':10,
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'right':12,
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'pmVersion':14,
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'packType':16,
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'packSize':18,
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'hRes':22,
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'vRes':26,
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'pixelType':30,
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'pixelSize':32,
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'cmpCount':34,
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'cmpSize':36,
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'planeBytes':38,
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'pmTable':42,
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'pmReserved':46
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}
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class PixMapWrapper:
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"""PixMapWrapper -- wraps the QD PixMap object in a Python class,
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with methods to easily get/set various pixmap fields. Note: Use the
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PixMap() method when passing to QD calls."""
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def __init__(self):
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self.__dict__['data'] = ''
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self._header = struct.pack("lhhhhhhhlllhhhhlll",
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id(self.data)+MacOS.string_id_to_buffer,
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0, # rowBytes
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0, 0, 0, 0, # bounds
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0, # pmVersion
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0, 0, # packType, packSize
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72<<16, 72<<16, # hRes, vRes
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QuickDraw.RGBDirect, # pixelType
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16, # pixelSize
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2, 5, # cmpCount, cmpSize,
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0, 0, 0) # planeBytes, pmTable, pmReserved
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self.__dict__['_pm'] = Qd.RawBitMap(self._header)
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def _stuff(self, element, bytes):
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offset = _pmElemOffset[element]
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fmt = _pmElemFormat[element]
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self._header = self._header[:offset] \
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+ struct.pack(fmt, bytes) \
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+ self._header[offset + struct.calcsize(fmt):]
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self.__dict__['_pm'] = None
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def _unstuff(self, element):
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offset = _pmElemOffset[element]
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fmt = _pmElemFormat[element]
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return struct.unpack(fmt, self._header[offset:offset+struct.calcsize(fmt)])[0]
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def __setattr__(self, attr, val):
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if attr == 'baseAddr':
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raise 'UseErr', "don't assign to .baseAddr -- assign to .data instead"
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elif attr == 'data':
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self.__dict__['data'] = val
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self._stuff('baseAddr', id(self.data) + MacOS.string_id_to_buffer)
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elif attr == 'rowBytes':
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# high bit is always set for some odd reason
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self._stuff('rowBytes', val | 0x8000)
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elif attr == 'bounds':
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# assume val is in official Left, Top, Right, Bottom order!
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self._stuff('left',val[0])
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self._stuff('top',val[1])
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self._stuff('right',val[2])
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self._stuff('bottom',val[3])
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elif attr == 'hRes' or attr == 'vRes':
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# 16.16 fixed format, so just shift 16 bits
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self._stuff(attr, int(val) << 16)
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elif attr in _pmElemFormat.keys():
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# any other pm attribute -- just stuff
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self._stuff(attr, val)
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else:
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self.__dict__[attr] = val
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def __getattr__(self, attr):
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if attr == 'rowBytes':
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# high bit is always set for some odd reason
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return self._unstuff('rowBytes') & 0x7FFF
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elif attr == 'bounds':
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# return bounds in official Left, Top, Right, Bottom order!
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return ( \
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self._unstuff('left'),
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self._unstuff('top'),
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self._unstuff('right'),
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self._unstuff('bottom') )
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elif attr == 'hRes' or attr == 'vRes':
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# 16.16 fixed format, so just shift 16 bits
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return self._unstuff(attr) >> 16
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elif attr in _pmElemFormat.keys():
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# any other pm attribute -- just unstuff
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return self._unstuff(attr)
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else:
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return self.__dict__[attr]
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def PixMap(self):
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"Return a QuickDraw PixMap corresponding to this data."
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if not self.__dict__['_pm']:
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self.__dict__['_pm'] = Qd.RawBitMap(self._header)
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return self.__dict__['_pm']
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def blit(self, x1=0,y1=0,x2=None,y2=None, port=None):
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"""Draw this pixmap into the given (default current) grafport."""
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src = self.bounds
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dest = [x1,y1,x2,y2]
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if x2 == None:
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dest[2] = x1 + src[2]-src[0]
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if y2 == None:
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dest[3] = y1 + src[3]-src[1]
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if not port: port = Qd.GetPort()
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Qd.CopyBits(self.PixMap(), port.portBits, src, tuple(dest),
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QuickDraw.srcCopy, None)
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def fromstring(self,s,width,height,format=imgformat.macrgb):
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"""Stuff this pixmap with raw pixel data from a string.
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Supply width, height, and one of the imgformat specifiers."""
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# we only support 16- and 32-bit mac rgb...
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# so convert if necessary
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if format != imgformat.macrgb and format != imgformat.macrgb16:
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# (LATER!)
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raise "NotImplementedError", "conversion to macrgb or macrgb16"
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self.data = s
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self.bounds = (0,0,width,height)
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self.cmpCount = 3
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self.pixelType = QuickDraw.RGBDirect
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if format == imgformat.macrgb:
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self.pixelSize = 32
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self.cmpSize = 8
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else:
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self.pixelSize = 16
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self.cmpSize = 5
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self.rowBytes = width*self.pixelSize/8
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def tostring(self, format=imgformat.macrgb):
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"""Return raw data as a string in the specified format."""
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# is the native format requested? if so, just return data
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if (format == imgformat.macrgb and self.pixelSize == 32) or \
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(format == imgformat.macrgb16 and self.pixelsize == 16):
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return self.data
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# otherwise, convert to the requested format
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# (LATER!)
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raise "NotImplementedError", "data format conversion"
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def fromImage(self,im):
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"""Initialize this PixMap from a PIL Image object."""
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# We need data in ARGB format; PIL can't currently do that,
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# but it can do RGBA, which we can use by inserting one null
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# up frontpm =
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if im.mode != 'RGBA': im = im.convert('RGBA')
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data = chr(0) + im.tostring()
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self.fromstring(data, im.size[0], im.size[1])
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def toImage(self):
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"""Return the contents of this PixMap as a PIL Image object."""
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import Image
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# our tostring() method returns data in ARGB format,
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# whereas Image uses RGBA; a bit of slicing fixes this...
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data = self.tostring()[1:] + chr(0)
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bounds = self.bounds
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return Image.fromstring('RGBA',(bounds[2]-bounds[0],bounds[3]-bounds[1]),data)
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def test():
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import MacOS
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import macfs
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import Image
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fsspec, ok = macfs.PromptGetFile("Image File:")
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if not ok: return
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path = fsspec.as_pathname()
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pm = PixMapWrapper()
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pm.fromImage( Image.open(path) )
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pm.blit(20,20)
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return pm
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