fix iOS short stroke preview

src/brush.cpp

@@ -206,7 +206,7 @@ void Stroke::add_point(glm::vec3 pos, float pressure)
 #ifdef __IOS__
     m_curve = glm::min(m_curve + 0.1f, 1.f);
     //pressure = pressure * glm::pow(m_curve, 2.f);
-    if (m_hold_points.size() < 5)
+    if (m_filter_points && m_hold_points.size() < 5)
     {
         m_hold_points.push_back({pos, pressure});
         return;

src/brush.h

@@ -97,6 +97,7 @@ public:
     float m_dist = 0;
     float m_step = 0;
     float m_max_size = FLT_MAX;
+    bool m_filter_points = true;
     Camera m_camera;
     std::shared_ptr<Brush> m_brush;
     cbuffer<float, 3> m_curve_angles;

src/node_stroke_preview.cpp

@@ -69,6 +69,7 @@ void NodeStrokePreview::draw_stroke()
         glm::mat4 proj = glm::ortho<float>(0, (float)m_rtt.getWidth(), 0, (float)m_rtt.getHeight(), -1, 1);
 
         const auto& b = m_brush;
+        m_stroke.m_filter_points = false;
         m_stroke.m_max_size = m_size.y / 800.f * App::I.zoom;
         m_stroke.m_camera.fov = Canvas::I->m_cam_fov;
         m_stroke.m_camera.rot = Canvas::I->m_cam_rot;