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

src/graphics/Bitmap.cpp

@@ -0,0 +1,55 @@
+#include "Bitmap.hpp"
+
+#include <algorithm>
+
+#include <iterator>
+#include <optional>
+#include <vector>
+
+namespace ptprnt::graphics {
+template <class T>
+Bitmap<T>::Bitmap(uint16_t width, uint16_t height)
+    : mWidth{width}, mHeight{height}, mPixels(width * height) {}
+
+template <class T>
+uint16_t Bitmap<T>::getWidth() {
+    return mWidth;
+}
+
+template <class T>
+uint16_t Bitmap<T>::getHeight() {
+    return mHeight;
+}
+
+template <class T>
+std::optional<std::vector<T>> Bitmap<T>::getLine(uint16_t line) {
+    if (line >= mHeight) {
+        // out of bound
+        return std::nullopt;
+    }
+
+    auto lineStart = mPixels.begin() + (line * mWidth);
+    auto lineEnd   = mPixels.begin() + ((line + 1) * mWidth);
+    return std::vector<T>(lineStart, lineEnd);
+}
+
+template <class T>
+std::optional<std::vector<T>> Bitmap<T>::getRow(uint16_t row) {
+    if (row >= mWidth) {
+        // out of bound
+        return std::nullopt;
+    }
+
+    // first pixel is always beginning of the row
+    std::vector<T> rowPixels(mHeight);
+    auto it = mPixels.begin() + row;
+
+    for (auto& rowElement : rowPixels) {
+        rowElement = *it;
+        it += mWidth;
+    }
+
+    return rowPixels;
+}
+
+}  // namespace ptprnt::graphics