it's kind of finished

src/tool.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "input.h"
+
+#define TOOL_COUNT (TOOL_CROP + 1)
+enum ToolType
+{
+    TOOL_PAN,
+    TOOL_MOVE,
+    TOOL_ROTATE,
+    TOOL_SCALE,
+    TOOL_CROP
+};
+
+struct Tool
+{
+    Input* input = NULL;
+    ToolType type = TOOL_PAN;
+    bool isEnabled = false;
+};
+
+void tool_init(Tool* self, Input* input);
+void tool_tick(Tool* self);