"""PixMapWrapper - defines the PixMapWrapper class, which wraps an opaque

QuickDraw PixMap data structure in a handy Python class.  Also provides

methods to convert to/from pixel data (from, e.g., the img module) or a

Python Imaging Library Image object.

J. Strout <joe@strout.net>  February 1999"""

from warnings import warnpy3k

warnpy3k("In 3.x, the PixMapWrapper module is removed.", stacklevel=2)

from Carbon import Qd

from Carbon import QuickDraw

import struct

import MacOS

import img

import imgformat

# PixMap data structure element format (as used with struct)

_pmElemFormat = {

    'baseAddr':'l',     # address of pixel data

    'rowBytes':'H',     # bytes per row, plus 0x8000

    'bounds':'hhhh',    # coordinates imposed over pixel data

        'top':'h',

        'left':'h',

        'bottom':'h',

        'right':'h',

    'pmVersion':'h',    # flags for Color QuickDraw

    'packType':'h',     # format of compression algorithm

    'packSize':'l',     # size after compression

    'hRes':'l',         # horizontal pixels per inch

    'vRes':'l',         # vertical pixels per inch

    'pixelType':'h',    # pixel format

    'pixelSize':'h',    # bits per pixel

    'cmpCount':'h',     # color components per pixel

    'cmpSize':'h',      # bits per component

    'planeBytes':'l',   # offset in bytes to next plane

    'pmTable':'l',      # handle to color table

    'pmReserved':'l'    # reserved for future use

}

# PixMap data structure element offset

_pmElemOffset = {

    'baseAddr':0,

    'rowBytes':4,

    'bounds':6,

        'top':6,

        'left':8,

        'bottom':10,

        'right':12,

    'pmVersion':14,

    'packType':16,

    'packSize':18,

    'hRes':22,

    'vRes':26,

    'pixelType':30,

    'pixelSize':32,

    'cmpCount':34,

    'cmpSize':36,

    'planeBytes':38,

    'pmTable':42,

    'pmReserved':46

}

class PixMapWrapper:

    """PixMapWrapper -- wraps the QD PixMap object in a Python class,

    with methods to easily get/set various pixmap fields.  Note: Use the

    PixMap() method when passing to QD calls."""

    def __init__(self):

        self.__dict__['data'] = ''

        self._header = struct.pack("lhhhhhhhlllhhhhlll",

            id(self.data)+MacOS.string_id_to_buffer,

            0,                      # rowBytes

            0, 0, 0, 0,             # bounds

            0,                      # pmVersion

            0, 0,                   # packType, packSize

            72<<16, 72<<16,         # hRes, vRes

            QuickDraw.RGBDirect,    # pixelType

            16,                     # pixelSize

            2, 5,                   # cmpCount, cmpSize,

            0, 0, 0)                # planeBytes, pmTable, pmReserved

        self.__dict__['_pm'] = Qd.RawBitMap(self._header)

    def _stuff(self, element, bytes):

        offset = _pmElemOffset[element]

        fmt = _pmElemFormat[element]

        self._header = self._header[:offset] \

            + struct.pack(fmt, bytes) \

            + self._header[offset + struct.calcsize(fmt):]

        self.__dict__['_pm'] = None

    def _unstuff(self, element):

        offset = _pmElemOffset[element]

        fmt = _pmElemFormat[element]

        return struct.unpack(fmt, self._header[offset:offset+struct.calcsize(fmt)])[0]

    def __setattr__(self, attr, val):

        if attr == 'baseAddr':

            raise 'UseErr', "don't assign to .baseAddr -- assign to .data instead"

        elif attr == 'data':

            self.__dict__['data'] = val

            self._stuff('baseAddr', id(self.data) + MacOS.string_id_to_buffer)

        elif attr == 'rowBytes':

            # high bit is always set for some odd reason

            self._stuff('rowBytes', val | 0x8000)

        elif attr == 'bounds':

            # assume val is in official Left, Top, Right, Bottom order!

            self._stuff('left',val[0])

            self._stuff('top',val[1])

            self._stuff('right',val[2])

            self._stuff('bottom',val[3])

        elif attr == 'hRes' or attr == 'vRes':

            # 16.16 fixed format, so just shift 16 bits

            self._stuff(attr, int(val) << 16)

        elif attr in _pmElemFormat.keys():

            # any other pm attribute -- just stuff

            self._stuff(attr, val)

        else:

            self.__dict__[attr] = val

    def __getattr__(self, attr):

        if attr == 'rowBytes':

            # high bit is always set for some odd reason

            return self._unstuff('rowBytes') & 0x7FFF

        elif attr == 'bounds':

            # return bounds in official Left, Top, Right, Bottom order!

            return ( \

                self._unstuff('left'),

                self._unstuff('top'),

                self._unstuff('right'),

                self._unstuff('bottom') )

        elif attr == 'hRes' or attr == 'vRes':

            # 16.16 fixed format, so just shift 16 bits

            return self._unstuff(attr) >> 16

        elif attr in _pmElemFormat.keys():

            # any other pm attribute -- just unstuff

            return self._unstuff(attr)

        else:

            return self.__dict__[attr]

    def PixMap(self):

        "Return a QuickDraw PixMap corresponding to this data."

        if not self.__dict__['_pm']:

            self.__dict__['_pm'] = Qd.RawBitMap(self._header)

        return self.__dict__['_pm']

    def blit(self, x1=0,y1=0,x2=None,y2=None, port=None):

        """Draw this pixmap into the given (default current) grafport."""

        src = self.bounds

        dest = [x1,y1,x2,y2]

        if x2 is None:

            dest[2] = x1 + src[2]-src[0]

        if y2 is None:

            dest[3] = y1 + src[3]-src[1]

        if not port: port = Qd.GetPort()

        Qd.CopyBits(self.PixMap(), port.GetPortBitMapForCopyBits(), src, tuple(dest),

                QuickDraw.srcCopy, None)

    def fromstring(self,s,width,height,format=imgformat.macrgb):

        """Stuff this pixmap with raw pixel data from a string.

        Supply width, height, and one of the imgformat specifiers."""

        # we only support 16- and 32-bit mac rgb...

        # so convert if necessary

        if format != imgformat.macrgb and format != imgformat.macrgb16:

            # (LATER!)

            raise "NotImplementedError", "conversion to macrgb or macrgb16"

        self.data = s

        self.bounds = (0,0,width,height)

        self.cmpCount = 3

        self.pixelType = QuickDraw.RGBDirect

        if format == imgformat.macrgb:

            self.pixelSize = 32

            self.cmpSize = 8

        else:

            self.pixelSize = 16

            self.cmpSize = 5

        self.rowBytes = width*self.pixelSize/8

    def tostring(self, format=imgformat.macrgb):

        """Return raw data as a string in the specified format."""

        # is the native format requested?  if so, just return data

        if (format == imgformat.macrgb and self.pixelSize == 32) or \

           (format == imgformat.macrgb16 and self.pixelsize == 16):

            return self.data

        # otherwise, convert to the requested format

        # (LATER!)

            raise "NotImplementedError", "data format conversion"

    def fromImage(self,im):

        """Initialize this PixMap from a PIL Image object."""

        # We need data in ARGB format; PIL can't currently do that,

        # but it can do RGBA, which we can use by inserting one null

        # up frontpm =

        if im.mode != 'RGBA': im = im.convert('RGBA')

        data = chr(0) + im.tostring()

        self.fromstring(data, im.size[0], im.size[1])

    def toImage(self):

        """Return the contents of this PixMap as a PIL Image object."""

        import Image

        # our tostring() method returns data in ARGB format,

        # whereas Image uses RGBA; a bit of slicing fixes this...

        data = self.tostring()[1:] + chr(0)

        bounds = self.bounds

        return Image.fromstring('RGBA',(bounds[2]-bounds[0],bounds[3]-bounds[1]),data)

def test():

    import MacOS

    import EasyDialogs

    import Image

    path = EasyDialogs.AskFileForOpen("Image File:")

    if not path: return

    pm = PixMapWrapper()

    pm.fromImage( Image.open(path) )

    pm.blit(20,20)

    return pm