add mask

src/mask.cpp

@@ -0,0 +1,34 @@
+#include "mask.h"
+
+#include <cassert>
+#include <cstring>
+
+namespace freling {
+
+Mask::Mask(uint32_t width, uint32_t height) : width(width), height(height) {
+    data.resize(width * height, true);
+}
+
+void Mask::fill(bool value) {
+    for (int i = 0, size = data.size(); i < size; ++i) {
+        data[i] = value;
+    }
+}
+
+void Mask::set(int x, int y, bool value) {
+    assert(x < width);
+    assert(y < height);
+
+    const int i = x + y * width;
+    data[i] = value;
+}
+
+bool Mask::get(int x, int y) {
+    assert(x < width);
+    assert(y < height);
+
+    const int i = x + y * width;
+    return data[i];
+}
+
+}  // namespace freling