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diff --git a/src/types.h b/src/types.h
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+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) 2018 Yuxuan Shui <[email protected]>
+
+#pragma once
+
+/// Some common types
+
+#include <stdint.h>
+
+/// Enumeration type to represent switches.
+typedef enum {
+	OFF = 0,        // false
+	ON,             // true
+	UNSET
+} switch_t;
+
+/// A structure representing margins around a rectangle.
+typedef struct {
+	int top;
+	int left;
+	int bottom;
+	int right;
+} margin_t;
+
+struct color {
+	double red, green, blue, alpha;
+};
+
+typedef uint32_t opacity_t;
+
+#define MARGIN_INIT                                                                      \
+	{ 0, 0, 0, 0 }