Moved graphics classes into own namespace, added unit testing with gtest

src/graphics/Bitmap.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stdint.h>
+
+#include <cstdint>
+#include <optional>
+#include <vector>
+
+namespace ptprnt::graphics {
+
+typedef uint8_t ALPHA8;  // Alpha only, 8 bit per pixel
+typedef uint32_t RGBX8;  // RGB, least significant byte unused, 8 bit per channel
+typedef uint32_t RGBA8;  // RGB, least significant byte alpha, 8 bit per channel
+typedef uint32_t ARGB8;  // RGB, most significant byte alpha, 8 bit per channel
+
+template <class T>
+class Bitmap {
+   public:
+    Bitmap(uint16_t width, uint16_t height);
+    ~Bitmap() = default;
+
+    uint16_t getWidth();
+    uint16_t getHeight();
+    std::optional<std::vector<T>> getLine(uint16_t line);
+    std::optional<std::vector<T>> getRow(uint16_t row);
+
+   private:
+    uint16_t mWidth;
+    uint16_t mHeight;
+    std::vector<T> mPixels;
+};
+
+// force compiler to generate class for type ALPHA8 and RGBX8
+template class Bitmap<ALPHA8>;
+template class Bitmap<RGBX8>;
+
+}  // namespace ptprnt::graphics