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1 |
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2 /* IMGFILE module - Interface to sgi libimage */ |
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3 |
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4 /* XXX This module should be done better at some point. It should return |
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5 ** an object of image file class, and have routines to manipulate these |
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6 ** image files in a neater way (so you can get rgb images off a greyscale |
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7 ** file, for instance, or do a straight display without having to get the |
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8 ** image bits into python, etc). |
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9 ** |
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10 ** Warning: this module is very non-reentrant (esp. the readscaled stuff) |
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11 */ |
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12 |
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13 #include "Python.h" |
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14 |
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15 #include <gl/image.h> |
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16 |
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17 #include "/usr/people/4Dgifts/iristools/include/izoom.h" |
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18 |
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19 /* Bunch of missing extern decls; keep gcc -Wall happy... */ |
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20 extern void i_seterror(); |
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21 extern void iclose(); |
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22 extern void filterzoom(); |
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23 extern void putrow(); |
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24 extern void getrow(); |
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25 |
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26 static PyObject * ImgfileError; /* Exception we raise for various trouble */ |
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27 |
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28 static int top_to_bottom; /* True if we want top-to-bottom images */ |
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29 |
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30 /* The image library does not always call the error hander :-(, |
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31 therefore we have a global variable indicating that it was called. |
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32 It is cleared by imgfile_open(). */ |
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33 |
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34 static int error_called; |
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35 |
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36 |
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37 /* The error handler */ |
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38 |
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39 static void |
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40 imgfile_error(char *str) |
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41 { |
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42 PyErr_SetString(ImgfileError, str); |
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43 error_called = 1; |
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44 return; /* To imglib, which will return a failure indicator */ |
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45 } |
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46 |
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47 |
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48 /* Open an image file and return a pointer to it. |
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49 Make sure we raise an exception if we fail. */ |
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50 |
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51 static IMAGE * |
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52 imgfile_open(char *fname) |
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53 { |
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54 IMAGE *image; |
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55 i_seterror(imgfile_error); |
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56 error_called = 0; |
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57 errno = 0; |
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58 if ( (image = iopen(fname, "r")) == NULL ) { |
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59 /* Error may already be set by imgfile_error */ |
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60 if ( !error_called ) { |
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61 if (errno) |
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62 PyErr_SetFromErrno(ImgfileError); |
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63 else |
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64 PyErr_SetString(ImgfileError, |
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65 "Can't open image file"); |
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66 } |
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67 return NULL; |
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68 } |
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69 return image; |
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70 } |
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71 |
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72 static PyObject * |
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73 imgfile_ttob(PyObject *self, PyObject *args) |
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74 { |
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75 int newval; |
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76 PyObject *rv; |
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77 |
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78 if (!PyArg_ParseTuple(args, "i:ttob", &newval)) |
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79 return NULL; |
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80 rv = PyInt_FromLong(top_to_bottom); |
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81 top_to_bottom = newval; |
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82 return rv; |
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83 } |
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84 |
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85 static PyObject * |
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86 imgfile_read(PyObject *self, PyObject *args) |
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87 { |
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88 char *fname; |
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89 PyObject *rv; |
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90 int xsize, ysize, zsize; |
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91 char *cdatap; |
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92 long *idatap; |
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93 static short rs[8192], gs[8192], bs[8192]; |
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94 int x, y; |
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95 IMAGE *image; |
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96 int yfirst, ylast, ystep; |
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97 |
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98 if ( !PyArg_ParseTuple(args, "s:read", &fname) ) |
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99 return NULL; |
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100 |
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101 if ( (image = imgfile_open(fname)) == NULL ) |
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102 return NULL; |
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103 |
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104 if ( image->colormap != CM_NORMAL ) { |
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105 iclose(image); |
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106 PyErr_SetString(ImgfileError, |
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107 "Can only handle CM_NORMAL images"); |
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108 return NULL; |
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109 } |
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110 if ( BPP(image->type) != 1 ) { |
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111 iclose(image); |
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112 PyErr_SetString(ImgfileError, |
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113 "Can't handle imgfiles with bpp!=1"); |
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114 return NULL; |
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115 } |
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116 xsize = image->xsize; |
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117 ysize = image->ysize; |
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118 zsize = image->zsize; |
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119 if ( zsize != 1 && zsize != 3) { |
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120 iclose(image); |
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121 PyErr_SetString(ImgfileError, |
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122 "Can only handle 1 or 3 byte pixels"); |
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123 return NULL; |
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124 } |
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125 if ( xsize > 8192 ) { |
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126 iclose(image); |
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127 PyErr_SetString(ImgfileError, |
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128 "Can't handle image with > 8192 columns"); |
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129 return NULL; |
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130 } |
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131 |
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132 if ( zsize == 3 ) zsize = 4; |
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133 rv = PyString_FromStringAndSize((char *)NULL, xsize*ysize*zsize); |
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134 if ( rv == NULL ) { |
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135 iclose(image); |
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136 return NULL; |
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137 } |
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138 cdatap = PyString_AsString(rv); |
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139 idatap = (long *)cdatap; |
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140 |
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141 if (top_to_bottom) { |
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142 yfirst = ysize-1; |
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143 ylast = -1; |
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144 ystep = -1; |
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145 } else { |
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146 yfirst = 0; |
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147 ylast = ysize; |
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148 ystep = 1; |
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149 } |
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150 for ( y=yfirst; y != ylast && !error_called; y += ystep ) { |
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151 if ( zsize == 1 ) { |
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152 getrow(image, rs, y, 0); |
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153 for(x=0; x<xsize; x++ ) |
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154 *cdatap++ = rs[x]; |
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155 } else { |
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156 getrow(image, rs, y, 0); |
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157 getrow(image, gs, y, 1); |
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158 getrow(image, bs, y, 2); |
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159 for(x=0; x<xsize; x++ ) |
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160 *idatap++ = (rs[x] & 0xff) | |
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161 ((gs[x] & 0xff)<<8) | |
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162 ((bs[x] & 0xff)<<16); |
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163 } |
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164 } |
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165 iclose(image); |
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166 if ( error_called ) { |
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167 Py_DECREF(rv); |
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168 return NULL; |
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169 } |
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170 return rv; |
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171 } |
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172 |
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173 static IMAGE *glob_image; |
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174 static long *glob_datap; |
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175 static int glob_width, glob_z, glob_ysize; |
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176 |
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177 static void |
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178 xs_get(short *buf, int y) |
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179 { |
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180 if (top_to_bottom) |
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181 getrow(glob_image, buf, (glob_ysize-1-y), glob_z); |
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182 else |
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183 getrow(glob_image, buf, y, glob_z); |
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184 } |
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185 |
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186 static void |
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187 xs_put_c(short *buf, int y) |
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188 { |
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189 char *datap = (char *)glob_datap + y*glob_width; |
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190 int width = glob_width; |
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191 |
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192 while ( width-- ) |
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193 *datap++ = (*buf++) & 0xff; |
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194 } |
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195 |
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196 static void |
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197 xs_put_0(short *buf, int y) |
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198 { |
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199 long *datap = glob_datap + y*glob_width; |
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200 int width = glob_width; |
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201 |
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202 while ( width-- ) |
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203 *datap++ = (*buf++) & 0xff; |
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204 } |
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205 static void |
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206 xs_put_12(short *buf, int y) |
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207 { |
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208 long *datap = glob_datap + y*glob_width; |
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209 int width = glob_width; |
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210 |
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211 while ( width-- ) |
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212 *datap++ |= ((*buf++) & 0xff) << (glob_z*8); |
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213 } |
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214 |
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215 static void |
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216 xscale(IMAGE *image, int xsize, int ysize, int zsize, |
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217 long *datap, int xnew, int ynew, int fmode, double blur) |
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218 { |
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219 glob_image = image; |
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220 glob_datap = datap; |
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221 glob_width = xnew; |
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222 glob_ysize = ysize; |
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223 if ( zsize == 1 ) { |
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224 glob_z = 0; |
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225 filterzoom(xs_get, xs_put_c, xsize, ysize, |
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226 xnew, ynew, fmode, blur); |
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227 } else { |
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228 glob_z = 0; |
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229 filterzoom(xs_get, xs_put_0, xsize, ysize, |
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230 xnew, ynew, fmode, blur); |
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231 glob_z = 1; |
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232 filterzoom(xs_get, xs_put_12, xsize, ysize, |
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233 xnew, ynew, fmode, blur); |
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234 glob_z = 2; |
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235 filterzoom(xs_get, xs_put_12, xsize, ysize, |
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236 xnew, ynew, fmode, blur); |
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237 } |
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238 } |
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239 |
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240 |
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241 static PyObject * |
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242 imgfile_readscaled(PyObject *self, PyObject *args) |
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243 { |
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244 char *fname; |
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245 PyObject *rv; |
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246 int xsize, ysize, zsize; |
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247 char *cdatap; |
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248 long *idatap; |
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249 static short rs[8192], gs[8192], bs[8192]; |
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250 int x, y; |
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251 int xwtd, ywtd, xorig, yorig; |
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252 float xfac, yfac; |
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253 IMAGE *image; |
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254 char *filter; |
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255 double blur = 1.0; |
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256 int extended; |
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257 int fmode = 0; |
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258 int yfirst, ylast, ystep; |
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259 |
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260 /* |
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261 ** Parse args. Funny, since arg 4 and 5 are optional |
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262 ** (filter name and blur factor). Also, 4 or 5 arguments indicates |
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263 ** extended scale algorithm in stead of simple-minded pixel drop/dup. |
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264 */ |
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265 extended = PyTuple_Size(args) >= 4; |
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266 if ( !PyArg_ParseTuple(args, "sii|sd", |
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267 &fname, &xwtd, &ywtd, &filter, &blur) ) |
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268 return NULL; |
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269 |
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270 /* |
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271 ** Check parameters, open file and check type, rows, etc. |
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272 */ |
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273 if ( extended ) { |
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274 if ( strcmp(filter, "impulse") == 0 ) |
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275 fmode = IMPULSE; |
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276 else if ( strcmp( filter, "box") == 0 ) |
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277 fmode = BOX; |
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278 else if ( strcmp( filter, "triangle") == 0 ) |
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279 fmode = TRIANGLE; |
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280 else if ( strcmp( filter, "quadratic") == 0 ) |
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281 fmode = QUADRATIC; |
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282 else if ( strcmp( filter, "gaussian") == 0 ) |
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283 fmode = GAUSSIAN; |
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284 else { |
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285 PyErr_SetString(ImgfileError, "Unknown filter type"); |
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286 return NULL; |
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287 } |
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288 } |
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289 |
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290 if ( (image = imgfile_open(fname)) == NULL ) |
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291 return NULL; |
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292 |
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293 if ( image->colormap != CM_NORMAL ) { |
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294 iclose(image); |
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295 PyErr_SetString(ImgfileError, |
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296 "Can only handle CM_NORMAL images"); |
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297 return NULL; |
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298 } |
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299 if ( BPP(image->type) != 1 ) { |
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300 iclose(image); |
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301 PyErr_SetString(ImgfileError, |
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302 "Can't handle imgfiles with bpp!=1"); |
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303 return NULL; |
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304 } |
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305 xsize = image->xsize; |
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306 ysize = image->ysize; |
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307 zsize = image->zsize; |
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308 if ( zsize != 1 && zsize != 3) { |
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309 iclose(image); |
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310 PyErr_SetString(ImgfileError, |
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311 "Can only handle 1 or 3 byte pixels"); |
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312 return NULL; |
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313 } |
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314 if ( xsize > 8192 ) { |
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315 iclose(image); |
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316 PyErr_SetString(ImgfileError, |
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317 "Can't handle image with > 8192 columns"); |
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318 return NULL; |
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319 } |
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320 |
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321 if ( zsize == 3 ) zsize = 4; |
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322 rv = PyString_FromStringAndSize(NULL, xwtd*ywtd*zsize); |
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323 if ( rv == NULL ) { |
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324 iclose(image); |
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325 return NULL; |
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326 } |
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327 PyFPE_START_PROTECT("readscaled", return 0) |
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328 xfac = (float)xsize/(float)xwtd; |
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329 yfac = (float)ysize/(float)ywtd; |
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330 PyFPE_END_PROTECT(yfac) |
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331 cdatap = PyString_AsString(rv); |
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332 idatap = (long *)cdatap; |
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333 |
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334 if ( extended ) { |
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335 xscale(image, xsize, ysize, zsize, |
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336 idatap, xwtd, ywtd, fmode, blur); |
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337 } else { |
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338 if (top_to_bottom) { |
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339 yfirst = ywtd-1; |
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340 ylast = -1; |
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341 ystep = -1; |
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342 } else { |
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343 yfirst = 0; |
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344 ylast = ywtd; |
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345 ystep = 1; |
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346 } |
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347 for ( y=yfirst; y != ylast && !error_called; y += ystep ) { |
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348 yorig = (int)(y*yfac); |
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349 if ( zsize == 1 ) { |
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350 getrow(image, rs, yorig, 0); |
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351 for(x=0; x<xwtd; x++ ) { |
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352 *cdatap++ = rs[(int)(x*xfac)]; |
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353 } |
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354 } else { |
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355 getrow(image, rs, yorig, 0); |
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356 getrow(image, gs, yorig, 1); |
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357 getrow(image, bs, yorig, 2); |
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358 for(x=0; x<xwtd; x++ ) { |
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359 xorig = (int)(x*xfac); |
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360 *idatap++ = (rs[xorig] & 0xff) | |
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361 ((gs[xorig] & 0xff)<<8) | |
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362 ((bs[xorig] & 0xff)<<16); |
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363 } |
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364 } |
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365 } |
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366 } |
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367 iclose(image); |
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368 if ( error_called ) { |
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369 Py_DECREF(rv); |
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370 return NULL; |
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371 } |
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372 return rv; |
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373 } |
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374 |
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375 static PyObject * |
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376 imgfile_getsizes(PyObject *self, PyObject *args) |
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377 { |
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378 char *fname; |
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379 PyObject *rv; |
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380 IMAGE *image; |
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381 |
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382 if ( !PyArg_ParseTuple(args, "s:getsizes", &fname) ) |
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383 return NULL; |
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384 |
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385 if ( (image = imgfile_open(fname)) == NULL ) |
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386 return NULL; |
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387 rv = Py_BuildValue("(iii)", image->xsize, image->ysize, image->zsize); |
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388 iclose(image); |
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389 return rv; |
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390 } |
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391 |
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392 static PyObject * |
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393 imgfile_write(PyObject *self, PyObject *args) |
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394 { |
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395 IMAGE *image; |
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396 char *fname; |
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397 int xsize, ysize, zsize, len; |
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398 char *cdatap; |
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399 long *idatap; |
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400 short rs[8192], gs[8192], bs[8192]; |
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401 short r, g, b; |
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402 long rgb; |
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403 int x, y; |
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404 int yfirst, ylast, ystep; |
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405 |
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406 |
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407 if ( !PyArg_ParseTuple(args, "ss#iii:write", |
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408 &fname, &cdatap, &len, &xsize, &ysize, &zsize) ) |
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409 return NULL; |
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410 |
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411 if ( zsize != 1 && zsize != 3 ) { |
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412 PyErr_SetString(ImgfileError, |
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413 "Can only handle 1 or 3 byte pixels"); |
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414 return NULL; |
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415 } |
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416 if ( len != xsize * ysize * (zsize == 1 ? 1 : 4) ) { |
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417 PyErr_SetString(ImgfileError, "Data does not match sizes"); |
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418 return NULL; |
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419 } |
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420 if ( xsize > 8192 ) { |
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421 PyErr_SetString(ImgfileError, |
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422 "Can't handle image with > 8192 columns"); |
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423 return NULL; |
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424 } |
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425 |
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426 error_called = 0; |
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427 errno = 0; |
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428 image =iopen(fname, "w", RLE(1), 3, xsize, ysize, zsize); |
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429 if ( image == 0 ) { |
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430 if ( ! error_called ) { |
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431 if (errno) |
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432 PyErr_SetFromErrno(ImgfileError); |
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433 else |
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434 PyErr_SetString(ImgfileError, |
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435 "Can't create image file"); |
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436 } |
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437 return NULL; |
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438 } |
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439 |
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440 idatap = (long *)cdatap; |
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441 |
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442 if (top_to_bottom) { |
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443 yfirst = ysize-1; |
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444 ylast = -1; |
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445 ystep = -1; |
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446 } else { |
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447 yfirst = 0; |
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448 ylast = ysize; |
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449 ystep = 1; |
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450 } |
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451 for ( y=yfirst; y != ylast && !error_called; y += ystep ) { |
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452 if ( zsize == 1 ) { |
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453 for( x=0; x<xsize; x++ ) |
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454 rs[x] = *cdatap++; |
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455 putrow(image, rs, y, 0); |
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456 } else { |
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457 for( x=0; x<xsize; x++ ) { |
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458 rgb = *idatap++; |
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459 r = rgb & 0xff; |
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460 g = (rgb >> 8 ) & 0xff; |
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461 b = (rgb >> 16 ) & 0xff; |
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462 rs[x] = r; |
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463 gs[x] = g; |
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464 bs[x] = b; |
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465 } |
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466 putrow(image, rs, y, 0); |
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467 putrow(image, gs, y, 1); |
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468 putrow(image, bs, y, 2); |
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469 } |
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470 } |
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471 iclose(image); |
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472 if ( error_called ) |
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473 return NULL; |
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474 Py_INCREF(Py_None); |
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475 return Py_None; |
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476 |
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477 } |
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478 |
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479 |
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480 static PyMethodDef imgfile_methods[] = { |
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481 { "getsizes", imgfile_getsizes, METH_VARARGS }, |
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482 { "read", imgfile_read, METH_VARARGS }, |
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483 { "readscaled", imgfile_readscaled, METH_VARARGS}, |
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484 { "write", imgfile_write, METH_VARARGS }, |
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485 { "ttob", imgfile_ttob, METH_VARARGS }, |
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486 { NULL, NULL } /* Sentinel */ |
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487 }; |
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488 |
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489 |
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490 void |
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491 initimgfile(void) |
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492 { |
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493 PyObject *m, *d; |
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494 |
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495 if (PyErr_WarnPy3k("the imgfile module has been removed in " |
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496 "Python 3.0", 2) < 0) |
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497 return; |
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498 |
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499 m = Py_InitModule("imgfile", imgfile_methods); |
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500 if (m == NULL) |
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501 return; |
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502 d = PyModule_GetDict(m); |
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503 ImgfileError = PyErr_NewException("imgfile.error", NULL, NULL); |
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504 if (ImgfileError != NULL) |
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505 PyDict_SetItemString(d, "error", ImgfileError); |
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506 } |
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507 |
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508 |
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509 |