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/* -*- mode: C; c-basic-offset: 2 -*-
*
* Pycairo - Python bindings for cairo
*
* Copyright © 2017 Christoph Reiter
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "private.h"
typedef struct {
PyObject_HEAD
PyObject *exporter;
void *buf;
Py_ssize_t len;
int readonly;
} Pycairo_BufferProxy;
static PyTypeObject Pycairo_BufferProxyType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cairo._BufferProxy",
sizeof(Pycairo_BufferProxy),
};
static int
buffer_proxy_getbuffer(PyObject *exporter, Py_buffer *view, int flags)
{
Pycairo_BufferProxy *self = (Pycairo_BufferProxy *)exporter;
return PyBuffer_FillInfo (view, exporter, self->buf, self->len,
self->readonly, flags);
}
static PyBufferProcs Pycairo_BufferProxy_as_buffer = {
(getbufferproc)buffer_proxy_getbuffer,
(releasebufferproc)0,
};
PyObject *
buffer_proxy_create_view(PyObject *exporter, void *buf, Py_ssize_t len,
int readonly) {
PyObject *memoryview;
PyObject *obj;
Pycairo_BufferProxy *self;
obj = (PyObject *)PyObject_GC_New(Pycairo_BufferProxy,
&Pycairo_BufferProxyType);
if (obj == NULL)
return NULL;
self = (Pycairo_BufferProxy *)obj;
Py_INCREF(exporter);
self->exporter = exporter;
self->buf = buf;
self->len = len;
self->readonly = readonly;
PyObject_GC_Track(obj);
memoryview = PyMemoryView_FromObject (obj);
Py_DECREF(obj);
return memoryview;
}
static int
buffer_proxy_traverse(PyObject* obj, visitproc visit, void *arg)
{
Pycairo_BufferProxy *self = (Pycairo_BufferProxy *)obj;
Py_VISIT(self->exporter);
return 0;
}
static int
buffer_proxy_clear(PyObject *obj)
{
Pycairo_BufferProxy *self = (Pycairo_BufferProxy *)obj;
Py_CLEAR(self->exporter);
return 0;
}
static void
buffer_proxy_dealloc(PyObject* obj)
{
Pycairo_BufferProxy *self = (Pycairo_BufferProxy *)obj;
PyObject_GC_UnTrack(obj);
self->buf = NULL;
self->len = 0;
self->readonly = 0;
buffer_proxy_clear(obj);
Py_TYPE(obj)->tp_free(obj);
}
int
init_buffer_proxy (void) {
Pycairo_BufferProxyType.tp_as_buffer = &Pycairo_BufferProxy_as_buffer;
Pycairo_BufferProxyType.tp_dealloc = &buffer_proxy_dealloc;
Pycairo_BufferProxyType.tp_traverse = &buffer_proxy_traverse;
Pycairo_BufferProxyType.tp_clear = &buffer_proxy_clear;
Pycairo_BufferProxyType.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC;
if (PyType_Ready(&Pycairo_BufferProxyType) < 0)
return -1;
return 0;
}
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