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diff --git a/src/common.h b/src/common.h
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--- a/src/common.h
+++ /dev/null
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-// SPDX-License-Identifier: MIT
-/*
- * Compton - a compositor for X11
- *
- * Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
- *
- * Copyright (c) 2011-2013, Christopher Jeffrey
- * Copyright (c) 2018, Yuxuan Shui <[email protected]>
- *
- * See LICENSE-mit for more information.
- *
- */
-
-#pragma once
-
-// === Options ===
-
-// Debug options, enable them using -D in CFLAGS
-// #define DEBUG_REPAINT    1
-// #define DEBUG_EVENTS     1
-// #define DEBUG_RESTACK    1
-// #define DEBUG_WINMATCH   1
-// #define DEBUG_C2         1
-// #define DEBUG_GLX_DEBUG_CONTEXT        1
-
-#define MAX_ALPHA (255)
-
-// === Includes ===
-
-// For some special functions
-#include <assert.h>
-#include <stdbool.h>
-#include <sys/time.h>
-#include <time.h>
-
-#include <X11/Xlib.h>
-#include <ev.h>
-#include <pixman.h>
-#include <xcb/xproto.h>
-#include <xcb/render.h>
-#include <xcb/sync.h>
-
-#include "uthash_extra.h"
-#ifdef CONFIG_OPENGL
-#include "backend/gl/glx.h"
-#endif
-
-// X resource checker
-#ifdef DEBUG_XRC
-#include "xrescheck.h"
-#endif
-
-// FIXME This list of includes should get shorter
-#include "backend/backend.h"
-#include "backend/driver.h"
-#include "compiler.h"
-#include "config.h"
-#include "region.h"
-#include "types.h"
-#include "utils.h"
-#include "list.h"
-#include "render.h"
-#include "win_defs.h"
-#include "x.h"
-
-// === Constants ===0
-
-#define NS_PER_SEC 1000000000L
-#define US_PER_SEC 1000000L
-#define MS_PER_SEC 1000
-
-/// @brief Maximum OpenGL FBConfig depth.
-#define OPENGL_MAX_DEPTH 32
-
-/// @brief Maximum OpenGL buffer age.
-#define CGLX_MAX_BUFFER_AGE 5
-
-// Window flags
-
-// === Types ===
-typedef struct glx_fbconfig glx_fbconfig_t;
-struct glx_session;
-struct atom;
-struct conv;
-
-typedef struct _ignore {
-	struct _ignore *next;
-	unsigned long sequence;
-} ignore_t;
-
-#ifdef CONFIG_OPENGL
-#ifdef DEBUG_GLX_DEBUG_CONTEXT
-typedef GLXContext (*f_glXCreateContextAttribsARB)(Display *dpy, GLXFBConfig config,
-                                                   GLXContext share_context, Bool direct,
-                                                   const int *attrib_list);
-typedef void (*GLDEBUGPROC)(GLenum source, GLenum type, GLuint id, GLenum severity,
-                            GLsizei length, const GLchar *message, GLvoid *userParam);
-typedef void (*f_DebugMessageCallback)(GLDEBUGPROC, void *userParam);
-#endif
-
-typedef struct glx_prog_main {
-	/// GLSL program.
-	GLuint prog;
-	/// Location of uniform "opacity" in window GLSL program.
-	GLint unifm_opacity;
-	/// Location of uniform "invert_color" in blur GLSL program.
-	GLint unifm_invert_color;
-	/// Location of uniform "tex" in window GLSL program.
-	GLint unifm_tex;
-	/// Location of uniform "time" in window GLSL program.
-	GLint unifm_time;
-} glx_prog_main_t;
-
-#define GLX_PROG_MAIN_INIT                                                               \
-	{                                                                                \
-		.prog = 0, .unifm_opacity = -1, .unifm_invert_color = -1,                \
-		.unifm_tex = -1, .unifm_time = -1                                        \
-	}
-
-#else
-struct glx_prog_main {};
-#endif
-
-#define PAINT_INIT                                                                       \
-	{ .pixmap = XCB_NONE, .pict = XCB_NONE }
-
-/// Linked list type of atoms.
-typedef struct _latom {
-	xcb_atom_t atom;
-	struct _latom *next;
-} latom_t;
-
-/// Structure containing all necessary data for a session.
-typedef struct session {
-	// === Event handlers ===
-	/// ev_io for X connection
-	ev_io xiow;
-	/// Timeout for delayed unredirection.
-	ev_timer unredir_timer;
-	/// Timer for fading
-	ev_timer fade_timer;
-	/// Timer for animations
-	ev_timer animation_timer;
-	/// Timer for delayed drawing, right now only used by
-	/// swopti
-	ev_timer delayed_draw_timer;
-	/// Use an ev_idle callback for drawing
-	/// So we only start drawing when events are processed
-	ev_idle draw_idle;
-	/// Called everytime we have timeouts or new data on socket,
-	/// so we can be sure if xcb read from X socket at anytime during event
-	/// handling, we will not left any event unhandled in the queue
-	ev_prepare event_check;
-	/// Signal handler for SIGUSR1
-	ev_signal usr1_signal;
-	/// Signal handler for SIGINT
-	ev_signal int_signal;
-	/// backend data
-	backend_t *backend_data;
-	/// backend blur context
-	void *backend_blur_context;
-	/// graphic drivers used
-	enum driver drivers;
-	/// file watch handle
-	void *file_watch_handle;
-	/// libev mainloop
-	struct ev_loop *loop;
-
-	// === Display related ===
-	/// Whether the X server is grabbed by us
-	bool server_grabbed;
-	/// Display in use.
-	Display *dpy;
-	/// Previous handler of X errors
-	XErrorHandler previous_xerror_handler;
-	/// Default screen.
-	int scr;
-	/// XCB connection.
-	xcb_connection_t *c;
-	/// Default visual.
-	xcb_visualid_t vis;
-	/// Default depth.
-	int depth;
-	/// Root window.
-	xcb_window_t root;
-	/// Height of root window.
-	int root_height;
-	/// Width of root window.
-	int root_width;
-	/// Current desktop number of root window
-	int root_desktop_num;
-	/// Desktop switch direction
-	int root_desktop_switch_direction;
-	// Damage of root window.
-	// Damage root_damage;
-	/// X Composite overlay window. Used if <code>--paint-on-overlay</code>.
-	xcb_window_t overlay;
-	/// The target window for debug mode
-	xcb_window_t debug_window;
-	/// Whether the root tile is filled by us.
-	bool root_tile_fill;
-	/// Picture of the root window background.
-	paint_t root_tile_paint;
-	/// The backend data the root pixmap bound to
-	void *root_image;
-	/// A region of the size of the screen.
-	region_t screen_reg;
-	/// Picture of root window. Destination of painting in no-DBE painting
-	/// mode.
-	xcb_render_picture_t root_picture;
-	/// A Picture acting as the painting target.
-	xcb_render_picture_t tgt_picture;
-	/// Temporary buffer to paint to before sending to display.
-	paint_t tgt_buffer;
-	/// Window ID of the window we register as a symbol.
-	xcb_window_t reg_win;
-#ifdef CONFIG_OPENGL
-	/// Pointer to GLX data.
-	struct glx_session *psglx;
-	/// Custom GLX program used for painting window.
-	// XXX should be in struct glx_session
-	glx_prog_main_t glx_prog_win;
-	struct glx_fbconfig_info *argb_fbconfig;
-#endif
-	/// Sync fence to sync draw operations
-	xcb_sync_fence_t sync_fence;
-	/// Whether we are rendering the first frame after screen is redirected
-	bool first_frame;
-
-	// === Operation related ===
-	/// Flags related to the root window
-	uint64_t root_flags;
-	/// Program options.
-	options_t o;
-	/// Whether we have hit unredirection timeout.
-	bool tmout_unredir_hit;
-	/// Whether we need to redraw the screen
-	bool redraw_needed;
-
-	/// Cache a xfixes region so we don't need to allocate it everytime.
-	/// A workaround for yshui/picom#301
-	xcb_xfixes_region_t damaged_region;
-	/// The region needs to painted on next paint.
-	region_t *damage;
-	/// The region damaged on the last paint.
-	region_t *damage_ring;
-	/// Number of damage regions we track
-	int ndamage;
-	/// Whether all windows are currently redirected.
-	bool redirected;
-	/// Pre-generated alpha pictures.
-	xcb_render_picture_t *alpha_picts;
-	/// Time of last fading. In milliseconds.
-	long fade_time;
-	/// Time of last window animation step. In milliseconds.
-	long animation_time;
-	/// Head pointer of the error ignore linked list.
-	ignore_t *ignore_head;
-	/// Pointer to the <code>next</code> member of tail element of the error
-	/// ignore linked list.
-	ignore_t **ignore_tail;
-	// Cached blur convolution kernels.
-	struct x_convolution_kernel **blur_kerns_cache;
-	/// If we should quit
-	bool quit:1;
-	// TODO(yshui) use separate flags for dfferent kinds of updates so we don't
-	// waste our time.
-	/// Whether there are pending updates, like window creation, etc.
-	bool pending_updates:1;
-
-	// === Expose event related ===
-	/// Pointer to an array of <code>XRectangle</code>-s of exposed region.
-	/// XXX why do we need this array?
-	rect_t *expose_rects;
-	/// Number of <code>XRectangle</code>-s in <code>expose_rects</code>.
-	int size_expose;
-	/// Index of the next free slot in <code>expose_rects</code>.
-	int n_expose;
-
-	// === Window related ===
-	/// A hash table of all windows.
-	struct win *windows;
-	/// Windows in their stacking order
-	struct list_node window_stack;
-	/// Pointer to <code>win</code> of current active window. Used by
-	/// EWMH <code>_NET_ACTIVE_WINDOW</code> focus detection. In theory,
-	/// it's more reliable to store the window ID directly here, just in
-	/// case the WM does something extraordinary, but caching the pointer
-	/// means another layer of complexity.
-	struct managed_win *active_win;
-	/// Window ID of leader window of currently active window. Used for
-	/// subsidiary window detection.
-	xcb_window_t active_leader;
-
-	// === Shadow/dimming related ===
-	/// 1x1 black Picture.
-	xcb_render_picture_t black_picture;
-	/// 1x1 Picture of the shadow color.
-	xcb_render_picture_t cshadow_picture;
-	/// 1x1 white Picture.
-	xcb_render_picture_t white_picture;
-	/// Gaussian map of shadow.
-	struct conv *gaussian_map;
-	// for shadow precomputation
-	/// A region in which shadow is not painted on.
-	region_t shadow_exclude_reg;
-
-	// === Software-optimization-related ===
-	/// Currently used refresh rate.
-	int refresh_rate;
-	/// Interval between refresh in nanoseconds.
-	long refresh_intv;
-	/// Nanosecond offset of the first painting.
-	long paint_tm_offset;
-
-#ifdef CONFIG_VSYNC_DRM
-	// === DRM VSync related ===
-	/// File descriptor of DRI device file. Used for DRM VSync.
-	int drm_fd;
-#endif
-
-	// === X extension related ===
-	/// Event base number for X Fixes extension.
-	int xfixes_event;
-	/// Error base number for X Fixes extension.
-	int xfixes_error;
-	/// Event base number for X Damage extension.
-	int damage_event;
-	/// Error base number for X Damage extension.
-	int damage_error;
-	/// Event base number for X Render extension.
-	int render_event;
-	/// Error base number for X Render extension.
-	int render_error;
-	/// Event base number for X Composite extension.
-	int composite_event;
-	/// Error base number for X Composite extension.
-	int composite_error;
-	/// Major opcode for X Composite extension.
-	int composite_opcode;
-	/// Whether X Shape extension exists.
-	bool shape_exists;
-	/// Event base number for X Shape extension.
-	int shape_event;
-	/// Error base number for X Shape extension.
-	int shape_error;
-	/// Whether X RandR extension exists.
-	bool randr_exists;
-	/// Event base number for X RandR extension.
-	int randr_event;
-	/// Error base number for X RandR extension.
-	int randr_error;
-	/// Whether X Present extension exists.
-	bool present_exists;
-	/// Whether X GLX extension exists.
-	bool glx_exists;
-	/// Event base number for X GLX extension.
-	int glx_event;
-	/// Error base number for X GLX extension.
-	int glx_error;
-	/// Whether X Xinerama extension exists.
-	bool xinerama_exists;
-	/// Xinerama screen regions.
-	region_t *xinerama_scr_regs;
-	/// Number of Xinerama screens.
-	int xinerama_nscrs;
-	/// Whether X Sync extension exists.
-	bool xsync_exists;
-	/// Event base number for X Sync extension.
-	int xsync_event;
-	/// Error base number for X Sync extension.
-	int xsync_error;
-	/// Whether X Render convolution filter exists.
-	bool xrfilter_convolution_exists;
-
-	// === Atoms ===
-	struct atom *atoms;
-	/// Array of atoms of all possible window types.
-	xcb_atom_t atoms_wintypes[NUM_WINTYPES];
-	/// Linked list of additional atoms to track.
-	latom_t *track_atom_lst;
-
-#ifdef CONFIG_DBUS
-	// === DBus related ===
-	void *dbus_data;
-#endif
-
-	int (*vsync_wait)(session_t *);
-} session_t;
-
-/// Enumeration for window event hints.
-typedef enum { WIN_EVMODE_UNKNOWN, WIN_EVMODE_FRAME, WIN_EVMODE_CLIENT } win_evmode_t;
-
-extern const char *const WINTYPES[NUM_WINTYPES];
-extern session_t *ps_g;
-
-void ev_xcb_error(session_t *ps, xcb_generic_error_t *err);
-
-// === Functions ===
-
-/**
- * Subtracting two struct timespec values.
- *
- * Taken from glibc manual.
- *
- * Subtract the `struct timespec' values X and Y,
- * storing the result in RESULT.
- * Return 1 if the difference is negative, otherwise 0.
- */
-static inline int
-timespec_subtract(struct timespec *result, struct timespec *x, struct timespec *y) {
-	/* Perform the carry for the later subtraction by updating y. */
-	if (x->tv_nsec < y->tv_nsec) {
-		long nsec = (y->tv_nsec - x->tv_nsec) / NS_PER_SEC + 1;
-		y->tv_nsec -= NS_PER_SEC * nsec;
-		y->tv_sec += nsec;
-	}
-
-	if (x->tv_nsec - y->tv_nsec > NS_PER_SEC) {
-		long nsec = (x->tv_nsec - y->tv_nsec) / NS_PER_SEC;
-		y->tv_nsec += NS_PER_SEC * nsec;
-		y->tv_sec -= nsec;
-	}
-
-	/* Compute the time remaining to wait.
-	   tv_nsec is certainly positive. */
-	result->tv_sec = x->tv_sec - y->tv_sec;
-	result->tv_nsec = x->tv_nsec - y->tv_nsec;
-
-	/* Return 1 if result is negative. */
-	return x->tv_sec < y->tv_sec;
-}
-
-/**
- * Get current time in struct timeval.
- */
-static inline struct timeval get_time_timeval(void) {
-	struct timeval tv = {0, 0};
-
-	gettimeofday(&tv, NULL);
-
-	// Return a time of all 0 if the call fails
-	return tv;
-}
-
-/**
- * Get current time in struct timespec.
- *
- * Note its starting time is unspecified.
- */
-static inline struct timespec get_time_timespec(void) {
-	struct timespec tm = {0, 0};
-
-	clock_gettime(CLOCK_MONOTONIC, &tm);
-
-	// Return a time of all 0 if the call fails
-	return tm;
-}
-
-/**
- * Return the painting target window.
- */
-static inline xcb_window_t get_tgt_window(session_t *ps) {
-	return ps->overlay != XCB_NONE ? ps->overlay : ps->root;
-}
-
-/**
- * Check if current backend uses GLX.
- */
-static inline bool bkend_use_glx(session_t *ps) {
-	return BKEND_GLX == ps->o.backend || BKEND_XR_GLX_HYBRID == ps->o.backend;
-}
-
-static void set_ignore(session_t *ps, unsigned long sequence) {
-	if (ps->o.show_all_xerrors)
-		return;
-
-	auto i = cmalloc(ignore_t);
-	if (!i)
-		return;
-
-	i->sequence = sequence;
-	i->next = 0;
-	*ps->ignore_tail = i;
-	ps->ignore_tail = &i->next;
-}
-
-/**
- * Ignore X errors caused by given X request.
- */
-static inline void set_ignore_cookie(session_t *ps, xcb_void_cookie_t cookie) {
-	set_ignore(ps, cookie.sequence);
-}
-
-/**
- * Determine if a window has a specific property.
- *
- * @param ps current session
- * @param w window to check
- * @param atom atom of property to check
- * @return true if it has the attribute, false otherwise
- */
-static inline bool wid_has_prop(const session_t *ps, xcb_window_t w, xcb_atom_t atom) {
-	auto r = xcb_get_property_reply(
-	    ps->c, xcb_get_property(ps->c, 0, w, atom, XCB_GET_PROPERTY_TYPE_ANY, 0, 0), NULL);
-	if (!r) {
-		return false;
-	}
-
-	auto rtype = r->type;
-	free(r);
-
-	if (rtype != XCB_NONE) {
-		return true;
-	}
-	return false;
-}
-
-void force_repaint(session_t *ps);
-
-/** @name DBus handling
- */
-///@{
-#ifdef CONFIG_DBUS
-/** @name DBus hooks
- */
-///@{
-void opts_set_no_fading_openclose(session_t *ps, bool newval);
-//!@}
-#endif
-
-/**
- * Set a <code>bool</code> array of all wintypes to true.
- */
-static inline void wintype_arr_enable(bool arr[]) {
-	wintype_t i;
-
-	for (i = 0; i < NUM_WINTYPES; ++i) {
-		arr[i] = true;
-	}
-}