implement export/import ppbr

src/image.cpp

@@ -197,9 +197,9 @@ Image Image::resize_squared(const glm::u8vec4& bg) const
 bool Image::read(BinaryStreamReader& r)
 {
     Serializer::Descriptor d;
+    r >> d;
     if (d.class_id != "image_png")
         return false;
-    r >> d;
     d.value<Serializer::Integer>("width", width);
     d.value<Serializer::Integer>("height", height);
     d.value<Serializer::Integer>("comp", comp);
@@ -230,7 +230,7 @@ void Image::write(BinaryStreamWriter& w) const
     stbi_write_png_to_func([](void* context, void* data, int size) {
         Serializer::Descriptor& d = *static_cast<Serializer::Descriptor*>(context);
         d.props["data"] = std::make_shared<Serializer::RawData>(std::vector<uint8_t>((uint8_t*)data, (uint8_t*)data + size));
-        }, &d, width, height, comp, m_data.get(), 0);
+    }, &d, width, height, comp, m_data.get(), 0);
 
     w << d;
 }