Mercurial > cpython-lru_cache-weakref

annotate Lib/plat-mac/PixMapWrapper.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents e7a6a4515ab0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """PixMapWrapper - defines the PixMapWrapper class, which wraps an opaque
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2 QuickDraw PixMap data structure in a handy Python class. Also provides
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3 methods to convert to/from pixel data (from, e.g., the img module) or a
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4 Python Imaging Library Image object.
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5
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6 J. Strout <joe@strout.net> February 1999"""
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7
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8
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9 from warnings import warnpy3k
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10 warnpy3k("In 3.x, the PixMapWrapper module is removed.", stacklevel=2)
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11
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12 from Carbon import Qd
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13 from Carbon import QuickDraw
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14 import struct
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15 import MacOS
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16 import img
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17 import imgformat
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18
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19 # PixMap data structure element format (as used with struct)
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20 _pmElemFormat = {
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21 'baseAddr':'l', # address of pixel data
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22 'rowBytes':'H', # bytes per row, plus 0x8000
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23 'bounds':'hhhh', # coordinates imposed over pixel data
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24 'top':'h',
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25 'left':'h',
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26 'bottom':'h',
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27 'right':'h',
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28 'pmVersion':'h', # flags for Color QuickDraw
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29 'packType':'h', # format of compression algorithm
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30 'packSize':'l', # size after compression
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31 'hRes':'l', # horizontal pixels per inch
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32 'vRes':'l', # vertical pixels per inch
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33 'pixelType':'h', # pixel format
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34 'pixelSize':'h', # bits per pixel
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35 'cmpCount':'h', # color components per pixel
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36 'cmpSize':'h', # bits per component
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37 'planeBytes':'l', # offset in bytes to next plane
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38 'pmTable':'l', # handle to color table
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39 'pmReserved':'l' # reserved for future use
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40 }
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41
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42 # PixMap data structure element offset
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43 _pmElemOffset = {
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44 'baseAddr':0,
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45 'rowBytes':4,
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46 'bounds':6,
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47 'top':6,
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48 'left':8,
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49 'bottom':10,
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50 'right':12,
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51 'pmVersion':14,
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52 'packType':16,
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53 'packSize':18,
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54 'hRes':22,
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55 'vRes':26,
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56 'pixelType':30,
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57 'pixelSize':32,
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58 'cmpCount':34,
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59 'cmpSize':36,
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60 'planeBytes':38,
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61 'pmTable':42,
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62 'pmReserved':46
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63 }
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64
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65 class PixMapWrapper:
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66 """PixMapWrapper -- wraps the QD PixMap object in a Python class,
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67 with methods to easily get/set various pixmap fields. Note: Use the
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68 PixMap() method when passing to QD calls."""
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69
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70 def __init__(self):
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71 self.__dict__['data'] = ''
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72 self._header = struct.pack("lhhhhhhhlllhhhhlll",
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73 id(self.data)+MacOS.string_id_to_buffer,
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74 0, # rowBytes
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75 0, 0, 0, 0, # bounds
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76 0, # pmVersion
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77 0, 0, # packType, packSize
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78 72<<16, 72<<16, # hRes, vRes
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79 QuickDraw.RGBDirect, # pixelType
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80 16, # pixelSize
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81 2, 5, # cmpCount, cmpSize,
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82 0, 0, 0) # planeBytes, pmTable, pmReserved
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83 self.__dict__['_pm'] = Qd.RawBitMap(self._header)
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84
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85 def _stuff(self, element, bytes):
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86 offset = _pmElemOffset[element]
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87 fmt = _pmElemFormat[element]
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88 self._header = self._header[:offset] \
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89 + struct.pack(fmt, bytes) \
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90 + self._header[offset + struct.calcsize(fmt):]
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91 self.__dict__['_pm'] = None
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92
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93 def _unstuff(self, element):
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94 offset = _pmElemOffset[element]
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95 fmt = _pmElemFormat[element]
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96 return struct.unpack(fmt, self._header[offset:offset+struct.calcsize(fmt)])[0]
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97
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98 def __setattr__(self, attr, val):
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99 if attr == 'baseAddr':
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100 raise 'UseErr', "don't assign to .baseAddr -- assign to .data instead"
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101 elif attr == 'data':
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102 self.__dict__['data'] = val
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103 self._stuff('baseAddr', id(self.data) + MacOS.string_id_to_buffer)
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104 elif attr == 'rowBytes':
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105 # high bit is always set for some odd reason
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106 self._stuff('rowBytes', val | 0x8000)
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107 elif attr == 'bounds':
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108 # assume val is in official Left, Top, Right, Bottom order!
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109 self._stuff('left',val[0])
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110 self._stuff('top',val[1])
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111 self._stuff('right',val[2])
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112 self._stuff('bottom',val[3])
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113 elif attr == 'hRes' or attr == 'vRes':
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114 # 16.16 fixed format, so just shift 16 bits
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115 self._stuff(attr, int(val) << 16)
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116 elif attr in _pmElemFormat.keys():
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117 # any other pm attribute -- just stuff
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118 self._stuff(attr, val)
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119 else:
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120 self.__dict__[attr] = val
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121
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122 def __getattr__(self, attr):
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123 if attr == 'rowBytes':
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124 # high bit is always set for some odd reason
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125 return self._unstuff('rowBytes') & 0x7FFF
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126 elif attr == 'bounds':
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127 # return bounds in official Left, Top, Right, Bottom order!
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128 return ( \
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129 self._unstuff('left'),
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130 self._unstuff('top'),
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131 self._unstuff('right'),
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132 self._unstuff('bottom') )
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133 elif attr == 'hRes' or attr == 'vRes':
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134 # 16.16 fixed format, so just shift 16 bits
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135 return self._unstuff(attr) >> 16
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136 elif attr in _pmElemFormat.keys():
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137 # any other pm attribute -- just unstuff
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138 return self._unstuff(attr)
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139 else:
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140 return self.__dict__[attr]
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141
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142
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143 def PixMap(self):
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144 "Return a QuickDraw PixMap corresponding to this data."
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145 if not self.__dict__['_pm']:
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146 self.__dict__['_pm'] = Qd.RawBitMap(self._header)
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147 return self.__dict__['_pm']
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f0f9acca4164 Moved most of Mac/Lib hierarchy to Lib/plat-mac: it can be used both
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148
46919
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149 def blit(self, x1=0,y1=0,x2=None,y2=None, port=None):
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150 """Draw this pixmap into the given (default current) grafport."""
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151 src = self.bounds
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152 dest = [x1,y1,x2,y2]
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153 if x2 is None:
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154 dest[2] = x1 + src[2]-src[0]
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155 if y2 is None:
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156 dest[3] = y1 + src[3]-src[1]
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157 if not port: port = Qd.GetPort()
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158 Qd.CopyBits(self.PixMap(), port.GetPortBitMapForCopyBits(), src, tuple(dest),
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159 QuickDraw.srcCopy, None)
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160
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161 def fromstring(self,s,width,height,format=imgformat.macrgb):
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162 """Stuff this pixmap with raw pixel data from a string.
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163 Supply width, height, and one of the imgformat specifiers."""
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164 # we only support 16- and 32-bit mac rgb...
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165 # so convert if necessary
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166 if format != imgformat.macrgb and format != imgformat.macrgb16:
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167 # (LATER!)
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168 raise "NotImplementedError", "conversion to macrgb or macrgb16"
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169 self.data = s
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170 self.bounds = (0,0,width,height)
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171 self.cmpCount = 3
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172 self.pixelType = QuickDraw.RGBDirect
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173 if format == imgformat.macrgb:
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174 self.pixelSize = 32
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175 self.cmpSize = 8
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176 else:
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177 self.pixelSize = 16
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178 self.cmpSize = 5
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179 self.rowBytes = width*self.pixelSize/8
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180
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181 def tostring(self, format=imgformat.macrgb):
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182 """Return raw data as a string in the specified format."""
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183 # is the native format requested? if so, just return data
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184 if (format == imgformat.macrgb and self.pixelSize == 32) or \
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185 (format == imgformat.macrgb16 and self.pixelsize == 16):
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186 return self.data
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187 # otherwise, convert to the requested format
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188 # (LATER!)
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189 raise "NotImplementedError", "data format conversion"
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190
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191 def fromImage(self,im):
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192 """Initialize this PixMap from a PIL Image object."""
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193 # We need data in ARGB format; PIL can't currently do that,
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194 # but it can do RGBA, which we can use by inserting one null
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195 # up frontpm =
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196 if im.mode != 'RGBA': im = im.convert('RGBA')
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197 data = chr(0) + im.tostring()
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198 self.fromstring(data, im.size[0], im.size[1])
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199
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200 def toImage(self):
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201 """Return the contents of this PixMap as a PIL Image object."""
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202 import Image
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203 # our tostring() method returns data in ARGB format,
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204 # whereas Image uses RGBA; a bit of slicing fixes this...
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205 data = self.tostring()[1:] + chr(0)
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206 bounds = self.bounds
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207 return Image.fromstring('RGBA',(bounds[2]-bounds[0],bounds[3]-bounds[1]),data)
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208
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209 def test():
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210 import MacOS
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211 import EasyDialogs
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212 import Image
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213 path = EasyDialogs.AskFileForOpen("Image File:")
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214 if not path: return
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215 pm = PixMapWrapper()
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216 pm.fromImage( Image.open(path) )
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217 pm.blit(20,20)
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218 return pm