add ABR brushes and presets with properties and patterns

src/brush.cpp

@@ -279,3 +279,24 @@ bool Brush::load_stencil(const std::string& path)
     m_stencil_path = path;
     return true;
 }
+
+bool Brush::load()
+{
+    if (!m_brush_path.empty())
+    {
+        m_tip_texture = std::make_shared<Texture2D>();
+        if (!m_tip_texture->load(m_brush_path))
+            return false;
+        m_tip_texture->create_mipmaps();
+        m_tip_texture->auto_destroy = true;
+    }
+    if (!m_stencil_path.empty())
+    {
+        m_stencil_texture = std::make_shared<Texture2D>();
+        if (!m_stencil_texture->load(m_stencil_path))
+            return false;
+        m_stencil_texture->create_mipmaps();
+        m_stencil_texture->auto_destroy = true;
+    }
+    return true;
+}