Split out win related functions to win.c

Also move static function prototypes out of compton.h. Seems like the
previous developers didn't know what header files are for.

Seems to have bugs after the split.

src/win.h

@@ -0,0 +1,97 @@
+#pragma once
+#include <stdbool.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/Xfixes.h>
+
+typedef struct session session_t;
+typedef struct win win;
+
+
+int win_get_name(session_t *ps, win *w);
+int win_get_role(session_t *ps, win *w);
+void win_determine_mode(session_t *ps, win *w);
+/**
+ * Set real focused state of a window.
+ */
+void win_set_focused(session_t *ps, win *w, bool focused);
+void win_determine_fade(session_t *ps, win *w);
+void win_update_shape_raw(session_t *ps, win *w);
+void win_update_shape(session_t *ps, win *w);
+void win_update_prop_shadow_raw(session_t *ps, win *w);
+void win_update_prop_shadow(session_t *ps, win *w);
+void win_set_shadow(session_t *ps, win *w, bool shadow_new);
+void win_determine_shadow(session_t *ps, win *w);
+void win_set_invert_color(session_t *ps, win *w, bool invert_color_new);
+void win_determine_invert_color(session_t *ps, win *w);
+void win_set_blur_background(session_t *ps, win *w, bool blur_background_new);
+void win_determine_blur_background(session_t *ps, win *w);
+void win_on_wtype_change(session_t *ps, win *w);
+void win_on_factor_change(session_t *ps, win *w);
+void calc_win_size(session_t *ps, win *w);
+void calc_shadow_geometry(session_t *ps, win *w);
+void win_upd_wintype(session_t *ps, win *w);
+void win_mark_client(session_t *ps, win *w, Window client);
+void win_unmark_client(session_t *ps, win *w);
+void win_recheck_client(session_t *ps, win *w);
+Window win_get_leader_raw(session_t *ps, win *w, int recursions);
+bool win_get_class(session_t *ps, win *w);
+void win_rounded_corners(session_t *ps, win *w);
+void win_calc_opacity(session_t *ps, win *w);
+void win_calc_dim(session_t *ps, win *w);
+/**
+ * Reread opacity property of a window.
+ */
+void win_update_opacity_prop(session_t *ps, win *w);
+/**
+ * Update leader of a window.
+ */
+void win_update_leader(session_t *ps, win *w);
+/**
+ * Update focused state of a window.
+ */
+void win_update_focused(session_t *ps, win *w);
+/**
+ * Retrieve the bounding shape of a window.
+ */
+XserverRegion
+win_border_size(session_t *ps, win *w, bool use_offset);
+/**
+ * Get a rectangular region a window (and possibly its shadow) occupies.
+ *
+ * Note w->shadow and shadow geometry must be correct before calling this
+ * function.
+ */
+XserverRegion win_extents(session_t *ps, win *w);
+/**
+ * Add a window to damaged area.
+ *
+ * @param ps current session
+ * @param w struct _win element representing the window
+ */
+void add_damage_from_win(session_t *ps, win *w);
+/**
+ * Get a rectangular region a window occupies, excluding shadow.
+ */
+XserverRegion
+win_get_region(session_t *ps, win *w, bool use_offset);
+/**
+ * Get a rectangular region a window occupies, excluding frame and shadow.
+ */
+XserverRegion
+win_get_region_noframe(session_t *ps, win *w, bool use_offset);
+/**
+ * Retrieve frame extents from a window.
+ */
+void
+win_get_frame_extents(session_t *ps, win *w, Window client);
+bool add_win(session_t *ps, Window id, Window prev);
+
+/**
+ * Get the leader of a window.
+ *
+ * This function updates w->cache_leader if necessary.
+ */
+static inline Window
+win_get_leader(session_t *ps, win *w) {
+  return win_get_leader_raw(ps, w, 0);
+}