fix picker which crashed on resolution change, timelapse frame only when draw a stroke

engine/app.cpp

@@ -302,7 +302,7 @@ void App::update(float dt)
     //glViewport(0, 0, (GLsizei)width, (GLsizei)height);
     //glClear(GL_COLOR_BUFFER_BIT);
 
-    if (!canvas->m_mouse_captured) 
+    //if (!canvas->m_mouse_captured)
     {
 #if _WIN32 || __OSX__
         layout.reload();
@@ -349,8 +349,10 @@ void App::update(float dt)
     if (rec_running)
     {
         rec_timer += dt;
-        if (rec_timer > 1.f)
+        if (rec_timer > 1.f && canvas->m_canvas->m_dirty_stroke)
         {
+            canvas->m_canvas->m_dirty_stroke = false;
+            
             LOG("rec tick");
             rec_timer = 0.f;
             
@@ -682,6 +684,7 @@ void App::rec_loop()
                 else
                 {
                     rec_count++;
+                    redraw = true;
                 }
             }
             rec_frames.pop_front();

engine/canvas.cpp

@@ -126,6 +126,11 @@ glm::vec4 ui::Canvas::pick_get(glm::vec2 canvas_loc)
     }
     return {0,0,0,1};
 }
+void ui::Canvas::pick_end()
+{
+    for (int i = 0; i < 6; i++)
+        m_pick_data[i].release();
+}
 void ui::Canvas::clear(const glm::vec4& c/*={0,0,0,1}*/)
 {
     snap_history({ 0, 1, 2, 3, 4, 5 });
@@ -458,7 +463,9 @@ void ui::Canvas::stroke_commit()
     if (!m_dirty || m_layers.empty())
         return;
     m_dirty = false;
-
+    m_dirty_stroke = true; // new stroke ready for timelapse capture
+    App::I.redraw = true;
+    
     // save viewport and clear color states
     GLint vp[4];
     GLfloat cc[4];

engine/canvas.h

@@ -50,6 +50,7 @@ public:
     BrushMesh m_mesh;
     bool m_dirty = false;
     bool m_commit_delayed = false;
+    bool m_dirty_stroke = false;
 
     static Canvas* I;
     bool m_alpha_lock = false;
@@ -129,6 +130,7 @@ public:
     void pick_start();
     void pick_update(int plane);
     glm::vec4 pick_get(glm::vec2 canvas_loc);
+    void pick_end();
     void snapshot_save(std::string data_path);
     void snapshot_restore();
     void snap_history(const std::vector<int>& planes);

engine/canvas_modes.cpp

@@ -99,6 +99,7 @@ void CanvasModePen::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
                 glm::vec4 pix = canvas->pick_get(loc);
                 canvas->m_current_brush.m_tip_color = pix;
                 App::I.color->set_color(pix);
+                canvas->pick_end();
             }
             m_dragging = false;
             m_picking = false;