1 files changed, 2 insertions, 0 deletions
diff --git a/qtmips_machine/lcddisplay.h b/qtmips_machine/lcddisplay.h
index 15a1e80..4821401 100644
--- a/qtmips_machine/lcddisplay.h
+++ b/qtmips_machine/lcddisplay.h
@@ -59,6 +59,7 @@ signals:
 public:
     bool wword(std::uint32_t address, std::uint32_t value);
     std::uint32_t rword(std::uint32_t address, bool debug_access = false) const;
+    virtual std::uint32_t get_change_counter() const override;
 
     inline uint width() {
         return fb_width;
@@ -69,6 +70,7 @@ public:
     }
 
 private:
+    mutable std::uint32_t change_counter;
     std::uint32_t pixel_address(uint x, uint y);
     uchar *fb_data;
     size_t fb_size;