Add geometry handling.

src/image/Image.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include "Color.h"
+
 #include <memory>
 #include <vector>
 
@@ -16,6 +18,9 @@ public:
     unsigned GetHeight() const;
     unsigned GetBitDepth() const;
     unsigned GetNumChannels() const;
+
+    void SetPixelValue(unsigned idx, unsigned jdx, const Color& color);
+
     unsigned char GetByte(unsigned idx, unsigned jdx) const;
 
     void SetData(const std::vector<unsigned char>& data);
@@ -25,6 +30,8 @@ public:
     void SetNumChannels(unsigned numChannels);
 
 private:
+    void Initialize();
+
     unsigned mWidth{1};
     unsigned mHeight{1};
     unsigned mBitDepth{8};