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c55088944a
picom/src/x.h
Yuxuan Shui 883d8c9142
x: add x_discard_events 
Also, during session_init, discard old events after we grab the server.
If we don't do that, old, out dated CreateNotify will cause us to add
the window with the same id multiple times. Here is an explanation of
how that could happen:

1. compton connects to X
2. a new window created by someone else, X send us a CreateNotify
3. compton is initializing, so it didn't handle the event.
4. compton pulls a list of all windows from X. This will include that
   window created in (2)
5. compton starts to handle event. it will handle the CreateNotify sent
   in (2), thus adds the same window twice.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
2019-05-21 20:15:30 +01:00

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// SPDX-License-Identifier: MPL-2.0
// Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
#pragma once
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <xcb/render.h>
#include <xcb/sync.h>
#include <xcb/xcb.h>
#include <xcb/xcb_renderutil.h>
#include <xcb/xfixes.h>
#include "compiler.h"
#include "kernel.h"
#include "region.h"
typedef struct session session_t;
/// Structure representing Window property value.
typedef struct winprop {
union {
void *ptr;
int8_t *p8;
int16_t *p16;
int32_t *p32;
uint32_t *c32; // 32bit cardinal
};
unsigned long nitems;
xcb_atom_t type;
int format;
xcb_get_property_reply_t *r;
} winprop_t;
struct xvisual_info {
/// Bit depth of the red component
int red_size;
/// Bit depth of the green component
int green_size;
/// Bit depth of the blue component
int blue_size;
/// Bit depth of the alpha component
int alpha_size;
/// The depth of X visual
int visual_depth;
xcb_visualid_t visual;
};
#define XCB_SYNCED_VOID(func, c, ...) \
xcb_request_check(c, func##_checked(c, __VA_ARGS__));
#define XCB_SYNCED(func, c, ...) \
({ \
xcb_generic_error_t *e = NULL; \
__auto_type r = func##_reply(c, func(c, __VA_ARGS__), &e); \
if (e) { \
x_print_error(e->sequence, e->major_code, e->minor_code, \
e->error_code); \
free(e); \
} \
r; \
})
/// Wraps x_new_id. abort the program if x_new_id returns error
static inline uint32_t x_new_id(xcb_connection_t *c) {
auto ret = xcb_generate_id(c);
if (ret == (uint32_t)-1) {
log_fatal("We seems to have run of XIDs. This is either a bug in the X "
"server, or a resource leakage in compton. Please open an "
"issue about this problem. compton will die.");
abort();
}
return ret;
}
/**
* Send a request to X server and get the reply to make sure all previous
* requests are processed, and their replies received
*
* xcb_get_input_focus is used here because it is the same request used by
* libX11
*/
static inline void x_sync(xcb_connection_t *c) {
free(xcb_get_input_focus_reply(c, xcb_get_input_focus(c), NULL));
}
/**
* Get a specific attribute of a window.
*
* Returns a blank structure if the returned type and format does not
* match the requested type and format.
*
* @param ps current session
* @param w window
* @param atom atom of attribute to fetch
* @param length length to read
* @param rtype atom of the requested type
* @param rformat requested format
* @return a <code>winprop_t</code> structure containing the attribute
* and number of items. A blank one on failure.
*/
winprop_t wid_get_prop_adv(const session_t *ps, xcb_window_t w, xcb_atom_t atom,
int offset, int length, xcb_atom_t rtype, int rformat);
/**
* Wrapper of wid_get_prop_adv().
*/
static inline winprop_t wid_get_prop(const session_t *ps, xcb_window_t wid, xcb_atom_t atom,
int length, xcb_atom_t rtype, int rformat) {
return wid_get_prop_adv(ps, wid, atom, 0L, length, rtype, rformat);
}
/// Discard all X events in queue or in flight. Should only be used when the server is
/// grabbed
static inline void x_discard_events(xcb_connection_t *c) {
xcb_generic_event_t *e;
while ((e = xcb_poll_for_event(c))) {
free(e);
}
}
/**
* Get the value of a type-<code>xcb_window_t</code> property of a window.
*
* @return the value if successful, 0 otherwise
*/
xcb_window_t wid_get_prop_window(session_t *ps, xcb_window_t wid, xcb_atom_t aprop);
/**
* Get the value of a text property of a window.
*/
bool wid_get_text_prop(session_t *ps, xcb_window_t wid, xcb_atom_t prop, char ***pstrlst,
int *pnstr);
const xcb_render_pictforminfo_t *
x_get_pictform_for_visual(xcb_connection_t *, xcb_visualid_t);
int x_get_visual_depth(xcb_connection_t *, xcb_visualid_t);
xcb_render_picture_t
x_create_picture_with_pictfmt_and_pixmap(xcb_connection_t *,
const xcb_render_pictforminfo_t *pictfmt,
xcb_pixmap_t pixmap, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr)
attr_nonnull(1, 2);
xcb_render_picture_t
x_create_picture_with_visual_and_pixmap(xcb_connection_t *, xcb_visualid_t visual,
xcb_pixmap_t pixmap, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr)
attr_nonnull(1);
xcb_render_picture_t
x_create_picture_with_standard_and_pixmap(xcb_connection_t *, xcb_pict_standard_t standard,
xcb_pixmap_t pixmap, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr)
attr_nonnull(1);
/**
* Create an picture.
*/
xcb_render_picture_t
x_create_picture_with_pictfmt(xcb_connection_t *, xcb_drawable_t, int w, int h,
const xcb_render_pictforminfo_t *pictfmt, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr)
attr_nonnull(1, 5);
xcb_render_picture_t
x_create_picture_with_visual(xcb_connection_t *, xcb_drawable_t, int w, int h,
xcb_visualid_t visual, uint32_t valuemask,
const xcb_render_create_picture_value_list_t *attr)
attr_nonnull(1);
/// Fetch a X region and store it in a pixman region
bool x_fetch_region(xcb_connection_t *, xcb_xfixes_region_t r, region_t *res);
void x_set_picture_clip_region(xcb_connection_t *, xcb_render_picture_t, int16_t clip_x_origin,
int16_t clip_y_origin, const region_t *);
void x_clear_picture_clip_region(xcb_connection_t *, xcb_render_picture_t pict);
/**
* X11 error handler function.
*
* XXX consider making this error to string
*/
void x_print_error(unsigned long serial, uint8_t major, uint16_t minor, uint8_t error_code);
xcb_pixmap_t x_create_pixmap(xcb_connection_t *, uint8_t depth, xcb_drawable_t drawable,
int width, int height);
bool x_validate_pixmap(xcb_connection_t *, xcb_pixmap_t pxmap);
/**
* Free a <code>winprop_t</code>.
*
* @param pprop pointer to the <code>winprop_t</code> to free.
*/
static inline void free_winprop(winprop_t *pprop) {
// Empty the whole structure to avoid possible issues
if (pprop->r)
free(pprop->r);
pprop->ptr = NULL;
pprop->r = NULL;
pprop->nitems = 0;
}
/// Get the back pixmap of the root window
xcb_pixmap_t x_get_root_back_pixmap(session_t *ps);
/// Return true if the atom refers to a property name that is used for the
/// root window background pixmap
bool x_is_root_back_pixmap_atom(session_t *ps, xcb_atom_t atom);
bool x_fence_sync(xcb_connection_t *, xcb_sync_fence_t);
/**
* Convert a struct conv to a X picture convolution filter, normalizing the kernel
* in the process. Allow the caller to specify the element at the center of the kernel,
* for compatibility with legacy code.
*
* @param[in] kernel the convolution kernel
* @param[in] center the element to put at the center of the matrix
* @param[inout] ret pointer to an array of `size`, if `size` is too small, more space
* will be allocated, and `*ret` will be updated.
* @param[inout] size size of the array pointed to by `ret`.
*/
int x_picture_filter_from_conv(const conv *kernel, double center,
xcb_render_fixed_t **ret, size_t *size);
/// Generate a search criteria for fbconfig from a X visual.
/// Returns {-1, -1, -1, -1, -1, -1} on failure
struct xvisual_info x_get_visual_info(xcb_connection_t *c, xcb_visualid_t visual);
xcb_visualid_t x_get_visual_for_standard(xcb_connection_t *c, xcb_pict_standard_t std);
xcb_screen_t *x_screen_of_display(xcb_connection_t *c, int screen);
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