Further compression and png work.

src/image/ImageBitStream.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "BitStream.h"
+
+#include "Image.h"
+
+class ImageBitStream : public BitStream
+{
+public:
+    ImageBitStream(Image<unsigned char>* image);
+
+    bool isFinished() const override;
+
+    std::vector<unsigned char> peekNextNBytes(unsigned n) const override;
+
+    std::optional<unsigned char> readNextByte() override;
+
+    void writeByte(unsigned char data) override;
+
+private:
+    Image<unsigned char>* mImage{nullptr};
+};