Circle buffer and png cleaning.

src/image/png/PngWriter.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "PngHeader.h"
+#include "Image.h"
+
+#include <memory>
+#include <string>
+#include <filesystem>
+
+using Path = std::filesystem::path;
+
+class BitStream;
+class BufferBitStream;
+class File;
+
+class PngWriter
+{
+public:
+    PngWriter();
+    ~PngWriter();
+
+    static std::unique_ptr<PngWriter> Create();
+
+    void setPath(const Path& path);
+
+    void setPngInfo(const PngInfo& info);
+
+    void write(const std::unique_ptr<Image<unsigned char> >& image);
+
+private:
+    void writeSignature();
+    void writeHeader();
+
+    void writeDataChunks(const BufferBitStream& buffer);
+
+    void writeEndChunk();
+
+    //void writeIDatChunk();
+
+    Path mPath;
+    Image<unsigned char>* mWorkingImage{nullptr};
+    std::unique_ptr<BitStream> mInStream;
+    std::unique_ptr<BitStream> mOutStream;
+    std::unique_ptr<File> mWorkingFile;
+
+    unsigned mPngInfoUserSet{false};
+    PngInfo mPngInfo;
+    PngHeader mPngHeader;
+};
+
+using PngWriterPtr = std::unique_ptr<PngWriter>;