fix stroke padding rect

src/canvas.cpp

@@ -606,8 +606,11 @@ void Canvas::stroke_draw()
         m_tmp[i].bindFramebuffer();
         if (!ShaderManager::ext_framebuffer_fetch)
         {
+            glm::vec2 o = glm::max({0, 0}, xy(b) - pad);
+            glm::vec2 sz = glm::min(m_size, zw(b) + pad) - o;
             m_tex[i].bind();
-            glCopyTexSubImage2D(GL_TEXTURE_2D, 0, b.x, b.y, b.x, b.y, box_size.x, box_size.y);
+            if (sz.x > 0 && sz.y > 0)
+                glCopyTexSubImage2D(GL_TEXTURE_2D, 0, o.x, o.y, o.x, o.y, sz.x, sz.y);
         }
         m_brush_shape.draw_fill();
         m_tmp[i].unbindFramebuffer();
@@ -1228,26 +1231,9 @@ void Canvas::stroke_start(glm::vec3 point, float pressure)
         m_dirty_box[i] = glm::vec4(m_width, m_height, 0, 0); // reset bounding box
         m_dirty_face[i] = false;
         
-        if (l->m_dirty_face[i])
-        {
-            m_tmp[i].bindFramebuffer();
-            // clear 
-            m_tmp[i].clear();
-            glActiveTexture(GL_TEXTURE1);
-            m_tex[i].bind();
-            glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 
-                0, 0, 0, 0, m_width, m_height);
-
-            m_tmp[i].copy(l->m_rtt[i]);
-            m_tmp[i].clear_mask({ 0, 0, 0, 1 });
-            m_tmp[i].unbindFramebuffer();
-        }
-        else
-        {
         m_tmp[i].bindFramebuffer();
         m_tmp[i].clear({ 0, 0, 0, 0 });
         m_tmp[i].unbindFramebuffer();
-        }
 
         if (m_current_brush->m_dual_enabled)
         {

src/node_canvas.cpp

@@ -167,6 +167,8 @@ void NodeCanvas::draw()
         {
             use_blend |= m_canvas->m_layers[i]->m_blend_mode != 0;
         }
+        if (Canvas::I->m_current_stroke)
+            use_blend |= Canvas::I->m_current_stroke->m_brush->m_blend_mode != 0;
 
         if (use_blend)
         {