mirror of https://github.com/yshui/picom.git
101 lines
5.0 KiB
C
101 lines
5.0 KiB
C
// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) Yuxuan Shui
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/// Yeah... We have our own window manager inside the compositor. As a compositor, we do
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/// need to do a little bit of what a window manager does, to correctly render windows.
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/// But our window manager is a lot less sophisticated than a average window manager. We
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/// only keep track of a list of top-level windows, and the order they are stacked.
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/// But OTOH doing window managing here is also somewhat more challenging. As we are not
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/// a window manager, we don't actually know what window is an application window, what
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/// is not. We have to rely on the real window manager playing nice and following the
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/// ICCCM and EWMH standards.
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#pragma once
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#include <uthash.h>
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#include <xcb/xproto.h>
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#include "compiler.h"
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#include "utils.h"
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struct wm;
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struct managed_win;
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struct list_node;
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struct x_connection;
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/// Direct children of a toplevel.
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struct subwin {
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xcb_window_t id;
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xcb_window_t toplevel;
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enum tristate has_wm_state;
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UT_hash_handle hh;
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};
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struct wm *wm_new(void);
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void wm_free(struct wm *wm, struct x_connection *c);
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struct managed_win *wm_active_win(struct wm *wm);
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void wm_set_active_win(struct wm *wm, struct managed_win *w);
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xcb_window_t wm_active_leader(struct wm *wm);
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void wm_set_active_leader(struct wm *wm, xcb_window_t leader);
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// Note: `wm` keeps track of 2 lists of windows. One is the window stack, which includes
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// all windows that might need to be rendered, which means it would include destroyed
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// windows in case they need to be faded out. This list is accessed by `wm_stack_*` series
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// of functions. The other is a hash table of windows, which does not include destroyed
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// windows. This list is accessed by `wm_find_*`, `wm_foreach`, and `wm_num_windows`.
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// Adding a window to the window stack also automatically adds it to the hash table.
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/// Find a window in the hash table from window id.
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struct win *wm_find(struct wm *wm, xcb_window_t id);
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/// Remove a window from the hash table.
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void wm_remove(struct wm *wm, struct win *w);
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/// Find a managed window from window id in window linked list of the session.
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struct managed_win *wm_find_managed(struct wm *wm, xcb_window_t id);
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// Find the WM frame of a client window. `id` is the client window id.
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struct managed_win *wm_find_by_client(struct wm *wm, xcb_window_t client);
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/// Call `func` on each toplevel window. `func` should return 0 if the iteration
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/// should continue. If it returns anything else, the iteration will stop and the
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/// return value will be returned from `wm_foreach`. If the iteration finishes
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/// naturally, 0 will be returned.
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int wm_foreach(struct wm *wm, int (*func)(struct win *, void *), void *data);
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/// Returns the number of windows in the hash table.
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unsigned attr_const wm_num_windows(const struct wm *wm);
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/// Returns the cursor past the last window in the stack (the `end`). The window stack is
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/// a cyclic linked list, so the next element after `end` is the first element. The `end`
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/// itself does not point to a valid window. The address of `end` is stable as long as
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/// the `struct wm` itself is not freed.
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struct list_node *attr_const wm_stack_end(struct wm *wm);
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/// Insert a new win entry at the top of the stack
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struct win *wm_stack_add_top(struct wm *wm, xcb_window_t id);
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/// Insert a new window above window with id `below`, if there is no window, add
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/// to top New window will be in unmapped state
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struct win *wm_stack_add_above(struct wm *wm, xcb_window_t id, xcb_window_t below);
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// Find the managed window immediately below `i` in the window stack
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struct managed_win *attr_pure wm_stack_next_managed(const struct wm *wm,
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const struct list_node *cursor);
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/// Move window `w` so it's right above `below`, if `below` is 0, `w` is moved
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/// to the bottom of the stack
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void wm_stack_move_above(struct wm *wm, struct win *w, xcb_window_t below);
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/// Move window `w` to the bottom of the stack.
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static inline void wm_stack_move_to_bottom(struct wm *wm, struct win *w) {
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wm_stack_move_above(wm, w, 0);
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}
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/// Move window `w` to the top of the stack.
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void wm_stack_move_to_top(struct wm *wm, struct win *w);
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/// Replace window `old` with `new_` in the stack, also replace the window in the hash
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/// table. `old` will be freed.
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void wm_stack_replace(struct wm *wm, struct win *old, struct win *new_);
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unsigned attr_const wm_stack_num_managed_windows(const struct wm *wm);
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struct subwin *wm_subwin_add_and_subscribe(struct wm *wm, struct x_connection *c,
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xcb_window_t id, xcb_window_t parent);
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struct subwin *wm_subwin_find(struct wm *wm, xcb_window_t id);
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void wm_subwin_remove(struct wm *wm, struct subwin *subwin);
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void wm_subwin_remove_and_unsubscribe(struct wm *wm, struct x_connection *c,
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struct subwin *subwin);
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/// Remove all subwins associated with a toplevel window
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void wm_subwin_remove_and_unsubscribe_for_toplevel(struct wm *wm, struct x_connection *c,
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xcb_window_t toplevel);
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