chore: import upstream snapshot with attribution

modules/python/src2/cv2_highgui.cpp

@@ -0,0 +1,184 @@
+#include "cv2_highgui.hpp"
+
+#ifdef HAVE_OPENCV_HIGHGUI
+
+#include "cv2_util.hpp"
+#include "opencv2/highgui.hpp"
+#include <map>
+
+using namespace cv;
+
+//======================================================================================================================
+
+static void OnMouse(int event, int x, int y, int flags, void* param)
+{
+    PyGILState_STATE gstate;
+    gstate = PyGILState_Ensure();
+
+    PyObject *o = (PyObject*)param;
+    PyObject *args = Py_BuildValue("iiiiO", event, x, y, flags, PyTuple_GetItem(o, 1));
+
+    PyObject *r = PyObject_Call(PyTuple_GetItem(o, 0), args, NULL);
+    if (r == NULL)
+        PyErr_Print();
+    else
+        Py_DECREF(r);
+    Py_DECREF(args);
+    PyGILState_Release(gstate);
+}
+
+PyObject *pycvSetMouseCallback(PyObject*, PyObject *args, PyObject *kw)
+{
+    const char *keywords[] = { "window_name", "on_mouse", "param", NULL };
+    char* name;
+    PyObject *on_mouse;
+    PyObject *param = NULL;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kw, "sO|O", (char**)keywords, &name, &on_mouse, &param))
+        return NULL;
+    if (!PyCallable_Check(on_mouse)) {
+        PyErr_SetString(PyExc_TypeError, "on_mouse must be callable");
+        return NULL;
+    }
+    if (param == NULL) {
+        param = Py_None;
+    }
+    PyObject* py_callback_info = Py_BuildValue("OO", on_mouse, param);
+    static std::map<std::string, PyObject*> registered_callbacks;
+    std::map<std::string, PyObject*>::iterator i = registered_callbacks.find(name);
+    if (i != registered_callbacks.end())
+    {
+        Py_DECREF(i->second);
+        i->second = py_callback_info;
+    }
+    else
+    {
+        registered_callbacks.insert(std::pair<std::string, PyObject*>(std::string(name), py_callback_info));
+    }
+    ERRWRAP2(setMouseCallback(name, OnMouse, py_callback_info));
+    Py_RETURN_NONE;
+}
+
+//======================================================================================================================
+
+static void OnChange(int pos, void *param)
+{
+    PyGILState_STATE gstate;
+    gstate = PyGILState_Ensure();
+
+    PyObject *o = (PyObject*)param;
+    PyObject *args = Py_BuildValue("(i)", pos);
+    PyObject *r = PyObject_Call(PyTuple_GetItem(o, 0), args, NULL);
+    if (r == NULL)
+        PyErr_Print();
+    else
+        Py_DECREF(r);
+    Py_DECREF(args);
+    PyGILState_Release(gstate);
+}
+
+// workaround for #20408, use nullptr, set value later
+static int _createTrackbar(const String &trackbar_name, const String &window_name, int value, int count,
+                    TrackbarCallback onChange, PyObject* py_callback_info)
+{
+    int n = createTrackbar(trackbar_name, window_name, NULL, count, onChange, py_callback_info);
+    setTrackbarPos(trackbar_name, window_name, value);
+    return n;
+}
+
+PyObject *pycvCreateTrackbar(PyObject*, PyObject *args)
+{
+    PyObject *on_change;
+    char* trackbar_name;
+    char* window_name;
+    int value;
+    int count;
+
+    if (!PyArg_ParseTuple(args, "ssiiO", &trackbar_name, &window_name, &value, &count, &on_change))
+        return NULL;
+    if (!PyCallable_Check(on_change)) {
+        PyErr_SetString(PyExc_TypeError, "on_change must be callable");
+        return NULL;
+    }
+    PyObject* py_callback_info = Py_BuildValue("OO", on_change, Py_None);
+    std::string name = std::string(window_name) + ":" + std::string(trackbar_name);
+    static std::map<std::string, PyObject*> registered_callbacks;
+    std::map<std::string, PyObject*>::iterator i = registered_callbacks.find(name);
+    if (i != registered_callbacks.end())
+    {
+        Py_DECREF(i->second);
+        i->second = py_callback_info;
+    }
+    else
+    {
+        registered_callbacks.insert(std::pair<std::string, PyObject*>(name, py_callback_info));
+    }
+    ERRWRAP2(_createTrackbar(trackbar_name, window_name, value, count, OnChange, py_callback_info));
+    Py_RETURN_NONE;
+}
+
+//======================================================================================================================
+
+static void OnButtonChange(int state, void *param)
+{
+    PyGILState_STATE gstate;
+    gstate = PyGILState_Ensure();
+
+    PyObject *o = (PyObject*)param;
+    PyObject *args;
+    if(PyTuple_GetItem(o, 1) != NULL)
+    {
+        args = Py_BuildValue("(iO)", state, PyTuple_GetItem(o,1));
+    }
+    else
+    {
+        args = Py_BuildValue("(i)", state);
+    }
+
+    PyObject *r = PyObject_Call(PyTuple_GetItem(o, 0), args, NULL);
+    if (r == NULL)
+        PyErr_Print();
+    else
+        Py_DECREF(r);
+    Py_DECREF(args);
+    PyGILState_Release(gstate);
+}
+
+PyObject *pycvCreateButton(PyObject*, PyObject *args, PyObject *kw)
+{
+    const char* keywords[] = {"buttonName", "onChange", "userData", "buttonType", "initialButtonState", NULL};
+    PyObject *on_change;
+    PyObject *userdata = NULL;
+    char* button_name;
+    int button_type = 0;
+    int initial_button_state = 0;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kw, "sO|Oii", (char**)keywords, &button_name, &on_change, &userdata, &button_type, &initial_button_state))
+        return NULL;
+    if (!PyCallable_Check(on_change)) {
+        PyErr_SetString(PyExc_TypeError, "onChange must be callable");
+        return NULL;
+    }
+    if (userdata == NULL) {
+        userdata = Py_None;
+    }
+
+    PyObject* py_callback_info = Py_BuildValue("OO", on_change, userdata);
+    std::string name(button_name);
+
+    static std::map<std::string, PyObject*> registered_callbacks;
+    std::map<std::string, PyObject*>::iterator i = registered_callbacks.find(name);
+    if (i != registered_callbacks.end())
+    {
+        Py_DECREF(i->second);
+        i->second = py_callback_info;
+    }
+    else
+    {
+        registered_callbacks.insert(std::pair<std::string, PyObject*>(name, py_callback_info));
+    }
+    ERRWRAP2(createButton(button_name, OnButtonChange, py_callback_info, button_type, initial_button_state != 0));
+    Py_RETURN_NONE;
+}
+
+#endif // HAVE_OPENCV_HIGHGUI