FIX: extra frame request

Do not freeze bargraph in Siplify dialog when no mouse move.

src/slic3r/GUI/GLCanvas3D.cpp

@@ -2780,11 +2780,10 @@ void GLCanvas3D::on_timer(wxTimerEvent& evt)
 
 void GLCanvas3D::on_render_timer(wxTimerEvent& evt)
 {
-    // no need to do anything here
-    // right after this event is recieved, idle event is fired
-
-    //m_dirty = true;
-    //wxWakeUpIdle();  
+    m_dirty = true; 
+    // wxWakeUpIdle(); 
+    // no need to wake up idle
+    // right after this event, idle event is fired
 }
 
 
@@ -2802,21 +2801,15 @@ void GLCanvas3D::schedule_extra_frame(int miliseconds)
             return;
         }
     } 
-    // Start timer
-    int64_t now = timestamp_now();
+    int remaining_time = m_render_timer.GetInterval();
     // Timer is not running
-    if (! m_render_timer.IsRunning()) {
-        m_extra_frame_requested_delayed = miliseconds;
+    if (!m_render_timer.IsRunning()) {
         m_render_timer.StartOnce(miliseconds);
-        m_render_timer_start = now;
     // Timer is running - restart only if new period is shorter than remaning period
     } else {
-        const int64_t remaining_time = (m_render_timer_start + m_extra_frame_requested_delayed) - now;
         if (miliseconds + 20 < remaining_time) {
             m_render_timer.Stop(); 
-            m_extra_frame_requested_delayed = miliseconds;
             m_render_timer.StartOnce(miliseconds);
-            m_render_timer_start = now;
         }
     }
 }

src/slic3r/GUI/GLCanvas3D.hpp

@@ -464,14 +464,12 @@ private:
     // when true renders an extra frame by not resetting m_dirty to false
     // see request_extra_frame()
     bool m_extra_frame_requested;
-    int  m_extra_frame_requested_delayed { std::numeric_limits<int>::max() };
     bool m_event_handlers_bound{ false };
 
     GLVolumeCollection m_volumes;
     GCodeViewer m_gcode_viewer;
 
     RenderTimer m_render_timer;
-    int64_t     m_render_timer_start;
 
     Selection m_selection;
     const DynamicPrintConfig* m_config;

src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp

@@ -184,7 +184,7 @@ void GLGizmoSimplify::on_render_input_window(float x, float y, float bottom_limi
         }
         ImGui::SameLine(m_gui_cfg->bottom_left_width);
         if (m_imgui->button(_L("Preview"))) {
-            m_state = State::simplifying;
+            m_state = State::preview;
             // simplify but not aply on mesh
             process();
         }
@@ -270,16 +270,11 @@ void GLGizmoSimplify::process()
         };
 
         indexed_triangle_set collapsed;
-        if (m_last_error.has_value()) {
-            // is chance to continue with last reduction
-            const indexed_triangle_set &its = m_volume->mesh().its;
-            uint32_t last_triangle_count = static_cast<uint32_t>(its.indices.size());
-            if ((!m_configuration.use_count || triangle_count <= last_triangle_count) && 
+        if (m_last_error.has_value() && m_last_count.has_value() &&             
+            (!m_configuration.use_count || triangle_count <= *m_last_count) && 
             (!m_configuration.use_error || m_configuration.max_error <= *m_last_error)) {
-                collapsed = its; // small copy
-            } else {
-                collapsed = *m_original_its; // copy
-            }
+            // continue from last reduction - speed up
+            collapsed = m_volume->mesh().its; // small copy
         } else {
             collapsed = *m_original_its; // copy
         }
@@ -288,14 +283,14 @@ void GLGizmoSimplify::process()
             its_quadric_edge_collapse(collapsed, triangle_count, &max_error, throw_on_cancel, statusfn);
             set_its(collapsed);
             m_is_valid_result = true;
+            m_last_count = triangle_count; // need to store last requirement, collapsed count could be count-1
             m_last_error = max_error;
         } catch (SimplifyCanceledException &) {
             // set state out of main thread
+            m_last_error = {};
             m_state = State::settings; 
         }
-        // need to render last status fn
-        // without sleep it freezes until mouse move
-        std::this_thread::sleep_for(std::chrono::milliseconds(50));
+        // need to render last status fn to change bar graph to buttons
         m_parent.schedule_extra_frame(0);
     });
 }

src/slic3r/GUI/Gizmos/GLGizmoSimplify.hpp

@@ -36,17 +36,18 @@ private:
     size_t m_obj_index;
 
     std::optional<indexed_triangle_set> m_original_its;
+
     std::optional<float> m_last_error; // for use previous reduction
+    std::optional<uint32_t> m_last_count;
 
     volatile bool m_need_reload; // after simplify, glReload must be on main thread
     std::thread m_worker;
 
     enum class State {
         settings,
-        simplifying, // start processing
-        canceling, // canceled
-        successfull, // successful simplified
-        close_on_end
+        preview,      // simplify to show preview
+        close_on_end, // simplify with close on end
+        canceling // after button click, before canceled
     };
     volatile State m_state;