Mercurial > pygame
annotate src/bufferproxy.c @ 1849:301bc61643a9 math_module
merged changes from trunk
| author | lorenz |
|---|---|
| date | Mon, 16 Nov 2009 18:31:40 +0000 |
| parents | fb9540cdf5e5 |
| children | 87541598228a |
| rev | line source |
|---|---|
| 860 | 1 /* |
| 2 pygame - Python Game Library | |
| 3 Copyright (C) 2007 Marcus von Appen | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 */ | |
| 20 | |
| 21 #define PYGAMEAPI_BUFFERPROXY_INTERNAL | |
| 22 | |
| 23 #include "pygame.h" | |
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24 #include "pgcompat.h" |
| 860 | 25 |
| 26 static PyObject* _bufferproxy_new (PyTypeObject *type, PyObject *args, | |
| 27 PyObject *kwds); | |
| 28 static void _bufferproxy_dealloc (PyBufferProxy *self); | |
| 29 static PyObject* _bufferproxy_get_dict (PyBufferProxy *self, void *closure); | |
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30 static PyObject* _bufferproxy_get_raw (PyBufferProxy *self, void *closure); |
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31 static PyObject* _bufferproxy_get_length (PyBufferProxy *self, void *closure); |
| 860 | 32 static PyObject* _bufferproxy_repr (PyBufferProxy *self); |
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33 static PyObject* _bufferproxy_write (PyBufferProxy *buffer, PyObject *args); |
| 860 | 34 |
| 35 /* Buffer methods */ | |
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36 #if PY3 |
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37 static int _bufferproxy_getbuffer (PyBufferProxy *self, Py_buffer *view, |
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38 int flags); |
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39 static void _bufferproxy_releasebuffer (PyBufferProxy *self, Py_buffer *view); |
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40 #else |
| 860 | 41 static Py_ssize_t _bufferproxy_getreadbuf (PyBufferProxy *buffer, |
| 42 Py_ssize_t _index, | |
| 43 const void **ptr); | |
| 44 static Py_ssize_t _bufferproxy_getwritebuf (PyBufferProxy *buffer, | |
| 45 Py_ssize_t _index, | |
| 46 const void **ptr); | |
| 47 static Py_ssize_t _bufferproxy_getsegcount (PyBufferProxy *buffer, | |
| 48 Py_ssize_t *lenp); | |
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49 #endif |
| 860 | 50 |
| 51 /* C API interfaces */ | |
| 52 static PyObject* PyBufferProxy_New (PyObject *parent, void *buffer, | |
| 53 Py_ssize_t length, PyObject *lock); | |
| 54 | |
| 55 /** | |
| 56 * Methods, which are bound to the PyBufferProxy type. | |
| 57 */ | |
| 58 static PyMethodDef _bufferproxy_methods[] = | |
| 59 { | |
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60 { "write", (PyCFunction) _bufferproxy_write, METH_VARARGS, |
| 906 | 61 "B.write (bufferproxy, buffer, offset) -> None\n\n" \ |
| 62 "Writes raw data to the bufferproxy.\n\n" \ | |
| 63 "Writes the raw data from buffer to the BufferProxy object, starting\n" \ | |
| 64 "at the specified offset within the BufferProxy.\n" \ | |
| 65 "If the length of the passed buffer exceeds the length of the\n" \ | |
| 66 "BufferProxy (reduced by the offset), an IndexError will be raised." }, | |
| 860 | 67 { NULL, NULL, 0, NULL } |
| 68 }; | |
| 69 | |
| 70 /** | |
| 71 * Getters and setters for the PyBufferProxy. | |
| 72 */ | |
| 73 static PyGetSetDef _bufferproxy_getsets[] = | |
| 74 { | |
| 75 { "__dict__", (getter) _bufferproxy_get_dict, NULL, NULL, NULL }, | |
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76 { "raw", (getter) _bufferproxy_get_raw, NULL, |
| 906 | 77 "The raw buffer data as string. The string may contain NUL bytes.", |
| 78 NULL }, | |
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79 { "length", (getter) _bufferproxy_get_length, NULL, |
| 906 | 80 "The size of the buffer data in bytes.", NULL }, |
| 860 | 81 { NULL, NULL, NULL, NULL, NULL } |
| 82 }; | |
| 83 | |
| 84 | |
| 85 /** | |
| 86 * Buffer interface support for the PyBufferProxy. | |
| 87 */ | |
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88 #if PY3 |
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89 static PyBufferProcs _bufferproxy_as_buffer = |
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90 { |
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91 (getbufferproc) _bufferproxy_getbuffer, |
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92 (releasebufferproc) _bufferproxy_releasebuffer |
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93 }; |
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94 #else |
| 860 | 95 static PyBufferProcs _bufferproxy_as_buffer = |
| 96 { | |
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97 (readbufferproc) _bufferproxy_getreadbuf, |
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98 (writebufferproc) _bufferproxy_getwritebuf, |
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99 (segcountproc) _bufferproxy_getsegcount, |
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100 NULL, |
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101 #if PY_VERSION_HEX >= 0x02060000 |
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102 NULL, |
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103 NULL |
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104 #endif |
| 860 | 105 }; |
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106 #endif |
| 860 | 107 |
| 108 static PyTypeObject PyBufferProxy_Type = | |
| 109 { | |
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110 TYPE_HEAD (NULL, 0) |
| 906 | 111 "pygame.bufferproxy.BufferProxy", /* tp_name */ |
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112 sizeof (PyBufferProxy), /* tp_basicsize */ |
| 860 | 113 0, /* tp_itemsize */ |
| 114 (destructor) _bufferproxy_dealloc, /* tp_dealloc */ | |
| 115 0, /* tp_print */ | |
| 116 0, /* tp_getattr */ | |
| 117 0, /* tp_setattr */ | |
| 118 0, /* tp_compare */ | |
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119 (reprfunc) &_bufferproxy_repr, /* tp_repr */ |
| 860 | 120 0, /* tp_as_number */ |
| 121 0, /* tp_as_sequence */ | |
| 122 0, /* tp_as_mapping */ | |
| 123 0, /* tp_hash */ | |
| 124 0, /* tp_call */ | |
| 125 0, /* tp_str */ | |
| 126 0, /* tp_getattro */ | |
| 127 0, /* tp_setattro */ | |
| 128 &_bufferproxy_as_buffer, /* tp_as_buffer */ | |
| 129 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_WEAKREFS, | |
| 906 | 130 "BufferProxy () -> BufferProxy\n\n" \ |
| 131 "Creates a new, empty BufferProxy.\n\n" \ | |
| 132 "A BufferProxy usually should be constructed from C code, not Python.", | |
| 860 | 133 0, /* tp_traverse */ |
| 134 0, /* tp_clear */ | |
| 135 0, /* tp_richcompare */ | |
| 136 offsetof (PyBufferProxy, weakrefs), /* tp_weaklistoffset */ | |
| 137 0, /* tp_iter */ | |
| 138 0, /* tp_iternext */ | |
| 139 _bufferproxy_methods, /* tp_methods */ | |
| 140 0, /* tp_members */ | |
| 141 _bufferproxy_getsets, /* tp_getset */ | |
| 142 0, /* tp_base */ | |
| 143 0, /* tp_dict */ | |
| 144 0, /* tp_descr_get */ | |
| 145 0, /* tp_descr_set */ | |
| 146 offsetof (PyBufferProxy, dict), /* tp_dictoffset */ | |
| 147 0, /* tp_init */ | |
| 148 0, /* tp_alloc */ | |
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149 _bufferproxy_new, /* tp_new */ |
| 1593 | 150 #ifndef __SYMBIAN32__ |
| 860 | 151 0, /* tp_free */ |
| 152 0, /* tp_is_gc */ | |
| 153 0, /* tp_bases */ | |
| 154 0, /* tp_mro */ | |
| 155 0, /* tp_cache */ | |
| 156 0, /* tp_subclasses */ | |
| 157 0, /* tp_weaklist */ | |
| 158 0 /* tp_del */ | |
| 1593 | 159 #endif |
| 860 | 160 }; |
| 161 | |
| 162 /** | |
| 163 * Creates a new PyBufferProxy. | |
| 164 */ | |
| 165 static PyObject* | |
| 166 _bufferproxy_new (PyTypeObject *type, PyObject *args, PyObject *kwds) | |
| 167 { | |
| 168 PyBufferProxy *self = (PyBufferProxy *) type->tp_alloc (type, 0); | |
| 169 if (!self) | |
| 170 return NULL; | |
| 171 | |
| 172 self->weakrefs = NULL; | |
| 173 self->dict = NULL; | |
| 174 self->parent = NULL; | |
| 175 self->buffer = NULL; | |
| 176 self->lock = NULL; | |
| 177 return (PyObject *) self; | |
| 178 } | |
| 179 | |
| 180 /** | |
| 181 * Deallocates the PyBufferProxy and its members. | |
| 182 */ | |
| 183 static void | |
| 184 _bufferproxy_dealloc (PyBufferProxy *self) | |
| 185 { | |
| 186 if (self->weakrefs) | |
| 187 PyObject_ClearWeakRefs ((PyObject *) self); | |
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188 |
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189 Py_XDECREF (self->lock); |
| 860 | 190 Py_XDECREF (self->dict); |
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191 Py_TYPE(self)->tp_free ((PyObject *) self); |
| 860 | 192 } |
| 193 | |
| 194 /**** Getter and setter access ****/ | |
| 195 | |
| 196 /** | |
| 197 * Getter for PyBufferProxy.__dict__. | |
| 198 */ | |
| 199 static PyObject* | |
| 200 _bufferproxy_get_dict (PyBufferProxy *self, void *closure) | |
| 201 { | |
| 202 if (!self->dict) | |
| 203 { | |
| 204 self->dict = PyDict_New (); | |
| 205 if (!self->dict) | |
| 206 return NULL; | |
| 207 } | |
| 208 | |
| 209 Py_INCREF (self->dict); | |
| 210 return self->dict; | |
| 211 } | |
| 212 | |
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213 /** |
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214 * Getter for PyBufferProxy.raw. |
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215 */ |
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216 static PyObject* |
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217 _bufferproxy_get_raw (PyBufferProxy *self, void *closure) |
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218 { |
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219 return Bytes_FromStringAndSize (self->buffer, self->length); |
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220 } |
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221 |
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222 /** |
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223 * Getter for PyBufferProxy.length |
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224 */ |
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225 static PyObject* |
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226 _bufferproxy_get_length (PyBufferProxy *self, void *closure) |
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227 { |
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228 return PyInt_FromLong (self->length); |
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229 } |
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230 |
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231 /**** Methods ****/ |
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232 |
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233 /** |
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234 * Representation method. |
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235 */ |
| 860 | 236 static PyObject* |
| 237 _bufferproxy_repr (PyBufferProxy *self) | |
| 238 { | |
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239 /* zd is for Py_size_t which python < 2.5 doesn't have. */ |
| 860 | 240 #if PY_VERSION_HEX < 0x02050000 |
| 241 return PyString_FromFormat("<BufferProxy(%d)>", self->length); | |
| 242 #else | |
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243 return Text_FromFormat("<BufferProxy(%zd)>", self->length); |
| 860 | 244 #endif |
| 245 } | |
| 246 | |
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247 /** |
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248 * Writes raw data to the buffer. |
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249 */ |
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250 static PyObject* |
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251 _bufferproxy_write (PyBufferProxy *buffer, PyObject *args) |
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252 { |
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253 Py_ssize_t offset; |
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254 Py_ssize_t length; |
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255 char *buf; |
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256 |
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257 if (!PyArg_ParseTuple (args, "s#i", &buf, &length, &offset)) |
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258 return NULL; |
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259 |
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260 if (offset + length > buffer->length) |
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261 { |
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262 return RAISE (PyExc_IndexError, "bytes to write exceed buffer size"); |
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263 } |
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264 |
| 914 | 265 memcpy (((Uint8 *)buffer->buffer) + offset, buf, (size_t) length); |
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266 |
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267 Py_RETURN_NONE; |
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268 } |
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269 |
| 860 | 270 /**** Buffer interfaces ****/ |
| 271 | |
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272 #if PY3 |
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273 static int |
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274 _bufferproxy_getbuffer (PyBufferProxy *self, Py_buffer *view, int flags) |
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275 { |
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276 if (!view) |
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277 return 0; |
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278 Py_INCREF (self); /* Guarantee that the object does not get destroyed */ |
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279 return PyBuffer_FillInfo (view, (PyObject*)self, self->buffer, |
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280 self->length, 0, flags); |
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281 } |
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282 |
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283 static void |
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284 _bufferproxy_releasebuffer (PyBufferProxy *self, Py_buffer *view) |
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285 { |
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286 Py_DECREF (self); |
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287 } |
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288 #else /* PY3 */ |
| 860 | 289 static Py_ssize_t |
| 290 _bufferproxy_getreadbuf (PyBufferProxy *buffer, Py_ssize_t _index, | |
| 291 const void **ptr) | |
| 292 { | |
| 293 if (_index != 0) | |
| 294 { | |
| 295 PyErr_SetString (PyExc_SystemError, | |
| 296 "Accessing non-existent buffer segment"); | |
| 297 return -1; | |
| 298 } | |
| 299 | |
| 300 if (!buffer->parent) | |
| 301 { | |
| 302 *ptr = NULL; | |
| 303 return 0; | |
| 304 } | |
| 305 | |
| 306 *ptr = buffer->buffer; | |
| 307 return buffer->length; | |
| 308 } | |
| 309 | |
| 310 static Py_ssize_t | |
| 311 _bufferproxy_getwritebuf (PyBufferProxy *buffer, Py_ssize_t _index, | |
| 312 const void **ptr) | |
| 313 { | |
| 314 if (_index != 0) | |
| 315 { | |
| 316 PyErr_SetString (PyExc_SystemError, | |
| 317 "Accessing non-existent array segment"); | |
| 318 return -1; | |
| 319 } | |
| 320 | |
| 321 if (!buffer->parent) | |
| 322 { | |
| 323 *ptr = NULL; | |
| 324 return 0; | |
| 325 } | |
| 326 | |
| 327 *ptr = buffer->buffer; | |
| 328 return buffer->length; | |
| 329 } | |
| 330 | |
| 331 static Py_ssize_t | |
| 332 _bufferproxy_getsegcount (PyBufferProxy *buffer, Py_ssize_t *lenp) | |
| 333 { | |
| 334 if (!buffer->parent) | |
| 335 { | |
| 336 *lenp = 0; | |
| 337 return 0; | |
| 338 } | |
| 339 | |
| 340 if (lenp) | |
| 341 *lenp = buffer->length; | |
| 342 return 1; | |
| 343 } | |
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344 #endif /* PY3 */ |
| 860 | 345 |
| 346 static PyObject* | |
| 347 PyBufferProxy_New (PyObject *parent, void *buffer, Py_ssize_t length, | |
| 348 PyObject *lock) | |
| 349 { | |
| 350 PyBufferProxy *buf; | |
| 351 | |
| 352 buf = (PyBufferProxy *) _bufferproxy_new (&PyBufferProxy_Type, NULL, NULL); | |
| 353 | |
| 354 if (!buf) | |
| 355 return NULL; | |
| 356 buf->buffer = buffer; | |
| 357 buf->length = length; | |
| 358 buf->lock = lock; | |
| 359 buf->parent = parent; | |
| 360 return (PyObject *) buf; | |
| 361 } | |
| 362 | |
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363 /*DOC*/ static char _bufferproxy_doc[] = |
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364 /*DOC*/ "A generic proxy module that can spend arbitrary " \ |
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365 /*DOC*/ "objects a buffer interface"; |
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366 |
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367 MODINIT_DEFINE (bufferproxy) |
| 860 | 368 { |
| 369 PyObject *module; | |
| 370 PyObject *dict; | |
| 371 PyObject *apiobj; | |
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372 int ecode; |
| 860 | 373 static void* c_api[PYGAMEAPI_BUFFERPROXY_NUMSLOTS]; |
| 374 | |
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375 #if PY3 |
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376 static struct PyModuleDef _module = { |
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377 PyModuleDef_HEAD_INIT, |
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378 "bufferproxy", |
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379 _bufferproxy_doc, |
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380 -1, |
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381 _bufferproxy_methods, |
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382 NULL, NULL, NULL, NULL |
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383 }; |
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384 #endif |
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385 |
| 860 | 386 if (PyType_Ready (&PyBufferProxy_Type) < 0) |
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387 MODINIT_ERROR; |
| 860 | 388 |
| 389 /* create the module */ | |
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390 #if PY3 |
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391 module = PyModule_Create (&_module); |
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392 #else |
| 1593 | 393 module = Py_InitModule3 (MODPREFIX "bufferproxy", NULL, _bufferproxy_doc); |
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394 #endif |
| 860 | 395 PyBufferProxy_Type.tp_getattro = PyObject_GenericGetAttr; |
| 396 Py_INCREF (&PyBufferProxy_Type); | |
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397 if (PyModule_AddObject (module, "BufferProxy", |
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398 (PyObject *)&PyBufferProxy_Type) == -1) { |
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399 Py_DECREF ((PyObject *)&PyBufferProxy_Type); |
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400 DECREF_MOD (module); |
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401 MODINIT_ERROR; |
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402 } |
| 860 | 403 dict = PyModule_GetDict (module); |
| 404 | |
| 405 c_api[0] = &PyBufferProxy_Type; | |
| 406 c_api[1] = PyBufferProxy_New; | |
| 407 apiobj = PyCObject_FromVoidPtr (c_api, NULL); | |
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408 if (apiobj == NULL) { |
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409 DECREF_MOD (module); |
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410 MODINIT_ERROR; |
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411 } |
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412 ecode = PyDict_SetItemString (dict, PYGAMEAPI_LOCAL_ENTRY, apiobj); |
| 860 | 413 Py_DECREF (apiobj); |
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414 if (ecode == -1) { |
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415 DECREF_MOD (module); |
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416 MODINIT_ERROR; |
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417 } |
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418 MODINIT_RETURN (module); |
| 860 | 419 } |