Add PDF writer.

src/image/Image.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+
+
+class Image
+{
+public:
+
+    Image(unsigned width, unsigned height);
+    static std::unique_ptr<Image> Create(unsigned width, unsigned height);
+
+    unsigned GetBytesPerRow() const;
+    unsigned GetWidth() const;
+    unsigned GetHeight() const;
+    unsigned GetBitDepth() const;
+    unsigned GetNumChannels() const;
+    unsigned char GetByte(unsigned idx, unsigned jdx) const;
+
+    void SetData(const std::vector<unsigned char>& data);
+    void SetWidth(unsigned width);
+    void SetHeight(unsigned height);
+    void SetBitDepth(unsigned bitDepth);
+    void SetNumChannels(unsigned numChannels);
+
+private:
+    unsigned mWidth{1};
+    unsigned mHeight{1};
+    unsigned mBitDepth{8};
+    unsigned mNumChannels{1};
+    std::vector<unsigned char> mData;
+};
+
+using ImagePtr = std::unique_ptr<Image>;