zbar-windows/python/imagescanner.c

/*------------------------------------------------------------------------
 *  Copyright 2009 (c) Jeff Brown <spadix@users.sourceforge.net>
 *
 *  This file is part of the ZBar Bar Code Reader.
 *
 *  The ZBar Bar Code Reader is free software; you can redistribute it
 *  and/or modify it under the terms of the GNU Lesser Public License as
 *  published by the Free Software Foundation; either version 2.1 of
 *  the License, or (at your option) any later version.
 *
 *  The ZBar Bar Code Reader is distributed in the hope that it will be
 *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 *  of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser Public License
 *  along with the ZBar Bar Code Reader; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 *  Boston, MA  02110-1301  USA
 *
 *  http://sourceforge.net/projects/zbar
 *------------------------------------------------------------------------*/

#include "zbarmodule.h"

static char imagescanner_doc[] =
    PyDoc_STR("scan images for barcodes.\n"
              "\n"
              "attaches symbols to image for each decoded result.");

static zbarImageScanner *imagescanner_new(PyTypeObject *type, PyObject *args,
                                          PyObject *kwds)
{
    static char *kwlist[] = { NULL };
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "", kwlist))
        return (NULL);

    zbarImageScanner *self = (zbarImageScanner *)type->tp_alloc(type, 0);
    if (!self)
        return (NULL);

    self->zscn = zbar_image_scanner_create();
    if (!self->zscn) {
        Py_DECREF(self);
        return (NULL);
    }

    return (self);
}

static void imagescanner_dealloc(zbarImageScanner *self)
{
    zbar_image_scanner_destroy(self->zscn);
    ((PyObject *)self)->ob_type->tp_free((PyObject *)self);
}

static zbarSymbolSet *imagescanner_get_results(zbarImageScanner *self,
                                               void *closure)
{
    const zbar_symbol_set_t *zsyms = zbar_image_scanner_get_results(self->zscn);
    return (zbarSymbolSet_FromSymbolSet(zsyms));
}

static PyGetSetDef imagescanner_getset[] = {
    { "results", (getter)imagescanner_get_results, NULL, NULL, NULL },
    { NULL } /* Sentinel */
};

static PyObject *imagescanner_set_config(zbarImageScanner *self, PyObject *args,
                                         PyObject *kwds)
{
    zbar_symbol_type_t sym = ZBAR_NONE;
    zbar_config_t cfg      = ZBAR_CFG_ENABLE;
    int val                = 1;
    static char *kwlist[]  = { "symbology", "config", "value", NULL };
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|iii", kwlist, &sym, &cfg,
                                     &val))
        return (NULL);

    if (zbar_image_scanner_set_config(self->zscn, sym, cfg, val)) {
        PyErr_SetString(PyExc_ValueError, "invalid configuration setting");
        return (NULL);
    }
    Py_RETURN_NONE;
}

static PyObject *imagescanner_parse_config(zbarImageScanner *self,
                                           PyObject *args, PyObject *kwds)
{
    const char *cfg       = NULL;
    static char *kwlist[] = { "config", NULL };
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "s", kwlist, &cfg))
        return (NULL);

    if (zbar_image_scanner_parse_config(self->zscn, cfg)) {
        PyErr_Format(PyExc_ValueError, "invalid configuration setting: %s",
                     cfg);
        return (NULL);
    }
    Py_RETURN_NONE;
}

static PyObject *imagescanner_enable_cache(zbarImageScanner *self,
                                           PyObject *args, PyObject *kwds)
{
    unsigned char enable  = 1;
    static char *kwlist[] = { "enable", NULL };
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O&", kwlist, object_to_bool,
                                     &enable))
        return (NULL);

    zbar_image_scanner_enable_cache(self->zscn, enable);
    Py_RETURN_NONE;
}

static PyObject *imagescanner_recycle(zbarImageScanner *self, PyObject *args,
                                      PyObject *kwds)
{
    zbarImage *img        = NULL;
    static char *kwlist[] = { "image", NULL };
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!", kwlist, &zbarImage_Type,
                                     &img))
        return (NULL);

    zbar_image_scanner_recycle_image(self->zscn, img->zimg);
    Py_RETURN_NONE;
}

static PyObject *imagescanner_scan(zbarImageScanner *self, PyObject *args,
                                   PyObject *kwds)
{
    zbarImage *img        = NULL;
    static char *kwlist[] = { "image", NULL };
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!", kwlist, &zbarImage_Type,
                                     &img))
        return (NULL);

    if (zbarImage_validate(img))
        return (NULL);

    int n = zbar_scan_image(self->zscn, img->zimg);
    if (n < 0) {
        PyErr_Format(PyExc_ValueError, "unsupported image format");
        return (NULL);
    }
#if PY_MAJOR_VERSION >= 3
    return (PyLong_FromLong(n));
#else
    return (PyInt_FromLong(n));
#endif
}

static PyMethodDef imagescanner_methods[] = {
    {
        "set_config",
        (PyCFunction)imagescanner_set_config,
        METH_VARARGS | METH_KEYWORDS,
    },
    {
        "parse_config",
        (PyCFunction)imagescanner_parse_config,
        METH_VARARGS | METH_KEYWORDS,
    },
    {
        "enable_cache",
        (PyCFunction)imagescanner_enable_cache,
        METH_VARARGS | METH_KEYWORDS,
    },
    {
        "recycle",
        (PyCFunction)imagescanner_recycle,
        METH_VARARGS | METH_KEYWORDS,
    },
    {
        "scan",
        (PyCFunction)imagescanner_scan,
        METH_VARARGS | METH_KEYWORDS,
    },
    {
        NULL,
    },
};

PyTypeObject zbarImageScanner_Type = {
    PyVarObject_HEAD_INIT(NULL, 0).tp_name = "zbar.ImageScanner",

    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,

    .tp_doc       = imagescanner_doc,
    .tp_basicsize = sizeof(zbarImageScanner),
    .tp_new       = (newfunc)imagescanner_new,
    .tp_dealloc   = (destructor)imagescanner_dealloc,
    .tp_getset    = imagescanner_getset,
    .tp_methods   = imagescanner_methods,
};