fix layer delete

engine/app_layout.cpp

@@ -96,6 +96,10 @@ void App::initLayout()
             canvas->m_canvas->layer_order(old_idx, new_idx);
         };
 
+        layers->on_layer_delete = [this](Node*, int idx) {
+            canvas->m_canvas->layer_remove(canvas->m_canvas->m_order[idx]);
+        };
+
         layers->on_layer_opacity_changed = [this](Node*, int idx, float value) {
             canvas->m_canvas->m_layers[canvas->m_canvas->m_order[idx]].m_opacity = value;
         };

engine/canvas.cpp

@@ -441,6 +441,16 @@ void ui::Canvas::layer_add(std::string name)
     m_layers.emplace_back();
     m_layers.back().create(m_width, m_height, name);
     m_order.push_back(idx);
+    m_current_layer_idx = idx;
+}
+void ui::Canvas::layer_remove(int idx)
+{
+    for (auto& i : m_order)
+        if (i > m_order[idx])
+            i--;
+    m_layers.erase(m_layers.begin() + idx);
+    m_order.erase(m_order.begin() + idx);
+    m_current_layer_idx = std::max<int>(m_layers.size() - 1, idx);
 }
 void ui::Canvas::layer_order(int idx, int pos)
 {

engine/canvas.h

@@ -94,6 +94,7 @@ public:
     Canvas() { I = this; }
     bool create(int width, int height);
     void resize(int width, int height);
+    void layer_remove(int idx);
     void layer_add(std::string name);
     void layer_order(int idx, int pos);
     void stroke_start(glm::vec2 point, float pressure, const ui::Brush& brush);

engine/node_canvas.cpp

@@ -11,7 +11,7 @@ void NodeCanvas::init()
 {
     m_mouse_ignore = false;
     m_canvas = std::make_unique<ui::Canvas>();
-    m_canvas->create(1024, 1024);
+    m_canvas->create(2048, 2048);
     m_sampler.create(GL_NEAREST);
     m_face_plane.create<1>(2, 2);
     m_line.create();
@@ -25,7 +25,7 @@ void NodeCanvas::init()
 void NodeCanvas::restore_context()
 {
     Node::restore_context();
-    m_canvas->create(1024, 1024);
+    m_canvas->create(2048, 2048);
     m_sampler.create(GL_NEAREST);
     m_face_plane.create<1>(2, 2);
     m_canvas->snapshot_restore();