#7785 - 3D view tooltip position as a function of mouse cursor size o…

…n Windows

src/slic3r/GUI/GLCanvas3D.cpp

@@ -817,9 +817,42 @@ void GLCanvas3D::Tooltip::render(const Vec2d& mouse_position, GLCanvas3D& canvas
     static ImVec2 size(0.0f, 0.0f);
 
     auto validate_position = [](const Vec2d& position, const GLCanvas3D& canvas, const ImVec2& wnd_size) {
+        auto calc_cursor_height = []() {
+            float ret = 16.0f;
+#ifdef _WIN32
+            // see: https://forums.codeguru.com/showthread.php?449040-get-the-system-current-cursor-size
+            // this code is not perfect because it returns a maximum height equal to 31 even if the cursor bitmap shown on screen is bigger
+            // but at least it gives the same result as wxWidgets in the settings tabs
+            ICONINFO ii;
+            if (::GetIconInfo((HICON)GetCursor(), &ii) != 0) {
+                BITMAP bitmap;
+                ::GetObject(ii.hbmMask, sizeof(BITMAP), &bitmap);
+                int width = bitmap.bmWidth;
+                int height = (ii.hbmColor == nullptr) ? bitmap.bmHeight / 2 : bitmap.bmHeight;
+                HDC dc = ::CreateCompatibleDC(nullptr);
+                if (dc != nullptr) {
+                    if (::SelectObject(dc, ii.hbmMask) != nullptr) {
+                        for (int i = 0; i < width; ++i) {
+                            for (int j = 0; j < height; ++j) {
+                                if (::GetPixel(dc, i, j) != RGB(255, 255, 255)) {
+                                    if (ret < float(j))
+                                        ret = float(j);
+                                }
+                            }
+                        }
+                        ::DeleteDC(dc);
+                    }
+                }
+                ::DeleteObject(ii.hbmColor);
+                ::DeleteObject(ii.hbmMask);
+            }
+#endif //  _WIN32
+            return ret;
+        };
+
         const Size cnv_size = canvas.get_canvas_size();
-        const float x = std::clamp((float)position.x(), 0.0f, (float)cnv_size.get_width() - wnd_size.x);
-        const float y = std::clamp((float)position.y() + 16.0f, 0.0f, (float)cnv_size.get_height() - wnd_size.y);
+        const float x = std::clamp(float(position.x()), 0.0f, float(cnv_size.get_width()) - wnd_size.x);
+        const float y = std::clamp(float(position.y()) + calc_cursor_height(), 0.0f, float(cnv_size.get_height()) - wnd_size.y);
         return Vec2f(x, y);
     };