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#include "cv2_util.hpp"
#include "opencv2/core.hpp"
#include "opencv2/core/utils/configuration.private.hpp"
#include "opencv2/core/utils/logger.hpp"
PyObject* opencv_error = NULL;
cv::TLSData<std::vector<std::string> > conversionErrorsTLS;
using namespace cv;
//======================================================================================================================
bool isPythonBindingsDebugEnabled()
{
static bool param_debug = cv::utils::getConfigurationParameterBool("OPENCV_PYTHON_DEBUG", false);
return param_debug;
}
void emit_failmsg(PyObject * exc, const char *msg)
{
static bool param_debug = isPythonBindingsDebugEnabled();
if (param_debug)
{
CV_LOG_WARNING(NULL, "Bindings conversion failed: " << msg);
}
PyErr_SetString(exc, msg);
}
int failmsg(const char *fmt, ...)
{
char str[1000];
va_list ap;
va_start(ap, fmt);
vsnprintf(str, sizeof(str), fmt, ap);
va_end(ap);
emit_failmsg(PyExc_TypeError, str);
return 0;
}
PyObject* failmsgp(const char *fmt, ...)
{
char str[1000];
va_list ap;
va_start(ap, fmt);
vsnprintf(str, sizeof(str), fmt, ap);
va_end(ap);
emit_failmsg(PyExc_TypeError, str);
return 0;
}
void pyRaiseCVException(const cv::Exception &e)
{
PyObject* temp_obj = PyString_FromString(e.file.c_str());
PyObject_SetAttrString(opencv_error, "file", temp_obj);
Py_DECREF(temp_obj);
temp_obj = PyString_FromString(e.func.c_str());
PyObject_SetAttrString(opencv_error, "func", temp_obj);
Py_DECREF(temp_obj);
temp_obj = PyInt_FromLong(e.line);
PyObject_SetAttrString(opencv_error, "line", temp_obj);
Py_DECREF(temp_obj);
temp_obj = PyInt_FromLong(e.code);
PyObject_SetAttrString(opencv_error, "code", temp_obj);
Py_DECREF(temp_obj);
temp_obj = PyString_FromString(e.msg.c_str());
PyObject_SetAttrString(opencv_error, "msg", temp_obj);
Py_DECREF(temp_obj);
temp_obj = PyString_FromString(e.err.c_str());
PyObject_SetAttrString(opencv_error, "err", temp_obj);
Py_DECREF(temp_obj);
PyErr_SetString(opencv_error, e.what());
}
//======================================================================================================================
void pyRaiseCVOverloadException(const std::string& functionName)
{
const std::vector<std::string>& conversionErrors = conversionErrorsTLS.getRef();
const std::size_t conversionErrorsCount = conversionErrors.size();
if (conversionErrorsCount > 0)
{
// In modern std libraries small string optimization is used = no dynamic memory allocations,
// but it can be applied only for string with length < 18 symbols (in GCC)
const std::string bullet = "\n - ";
// Estimate required buffer size - save dynamic memory allocations = faster
std::size_t requiredBufferSize = bullet.size() * conversionErrorsCount;
for (std::size_t i = 0; i < conversionErrorsCount; ++i)
{
requiredBufferSize += conversionErrors[i].size();
}
// Only string concatenation is required so std::string is way faster than
// std::ostringstream
std::string errorMessage("Overload resolution failed:");
errorMessage.reserve(errorMessage.size() + requiredBufferSize);
for (std::size_t i = 0; i < conversionErrorsCount; ++i)
{
errorMessage += bullet;
errorMessage += conversionErrors[i];
}
cv::Exception exception(Error::StsBadArg, errorMessage, functionName, "", -1);
pyRaiseCVException(exception);
}
else
{
cv::Exception exception(Error::StsInternal, "Overload resolution failed, but no errors reported",
functionName, "", -1);
pyRaiseCVException(exception);
}
}
void pyPopulateArgumentConversionErrors()
{
if (PyErr_Occurred())
{
PySafeObject exception_type;
PySafeObject exception_value;
PySafeObject exception_traceback;
PyErr_Fetch(exception_type, exception_value, exception_traceback);
PyErr_NormalizeException(exception_type, exception_value,
exception_traceback);
PySafeObject exception_message(PyObject_Str(exception_value));
std::string message;
getUnicodeString(exception_message, message);
conversionErrorsTLS.getRef().push_back(std::move(message));
}
}
//======================================================================================================================
static int OnError(int status, const char *func_name, const char *err_msg, const char *file_name, int line, void *userdata)
{
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
PyObject *on_error = (PyObject*)userdata;
PyObject *args = Py_BuildValue("isssi", status, func_name, err_msg, file_name, line);
PyObject *r = PyObject_Call(on_error, args, NULL);
if (r == NULL) {
PyErr_Print();
} else {
Py_DECREF(r);
}
Py_DECREF(args);
PyGILState_Release(gstate);
return 0; // The return value isn't used
}
PyObject *pycvRedirectError(PyObject*, PyObject *args, PyObject *kw)
{
const char *keywords[] = { "on_error", NULL };
PyObject *on_error;
if (!PyArg_ParseTupleAndKeywords(args, kw, "O", (char**)keywords, &on_error))
return NULL;
if ((on_error != Py_None) && !PyCallable_Check(on_error)) {
PyErr_SetString(PyExc_TypeError, "on_error must be callable");
return NULL;
}
// Keep track of the previous handler parameter, so we can decref it when no longer used
static PyObject* last_on_error = NULL;
if (last_on_error) {
Py_DECREF(last_on_error);
last_on_error = NULL;
}
if (on_error == Py_None) {
ERRWRAP2(redirectError(NULL));
} else {
last_on_error = on_error;
Py_INCREF(last_on_error);
ERRWRAP2(redirectError(OnError, last_on_error));
}
Py_RETURN_NONE;
}
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