Move common types to types.h

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/types.h

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
+
+/// Some common types
+
+#include <stdint.h>
+
+/// Enumeration type to represent switches.
+typedef enum {
+  OFF,    // false
+  ON,     // true
+  UNSET
+} switch_t;
+
+/// Structure representing a X geometry.
+typedef struct {
+  int wid;
+  int hei;
+  int x;
+  int y;
+} geometry_t;
+
+/// A structure representing margins around a rectangle.
+typedef struct {
+  int top;
+  int left;
+  int bottom;
+  int right;
+} margin_t;
+
+typedef uint32_t opacity_t;
+
+#define MARGIN_INIT { 0, 0, 0, 0 }