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connection_info.C
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connection_info.C
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/*
** Copyright 2017-2021 Double Precision, Inc.
** See COPYING for distribution information.
*/
#include "libcxxw_config.h"
#include "connection_info.H"
#include "messages.H"
#include <x/exception.H>
#include <xcb/sync.h>
LIBCXXW_NAMESPACE_START
//! Internal helper class used during construction.
class LIBCXX_INTERNAL connection_infoObj::connection_handle {
public:
xcb_connection_t * conn;
int default_screen;
connection_handle(const std::string &display)
{
conn=xcb_connect(display.size() == 0 ?
nullptr:display.c_str(), &default_screen);
}
~connection_handle()=default;
};
connection_infoObj::connection_infoObj(const std::string_view &display)
: connection_infoObj(connection_handle(std::string(display.begin(),
display.end())))
{
}
connection_infoObj::connection_infoObj(connection_handle &&handle)
: conn(handle.conn), default_screen(handle.default_screen),
atoms_info(handle.conn)
{
if (xcb_connection_has_error(conn))
{
xcb_disconnect(conn);
throw EXCEPTION(_("Display connection failed."));
}
if (!xcb_render_util_query_version(conn))
{
xcb_disconnect(conn);
throw EXCEPTION(_("The display server does not support the X render extension"));
}
{
returned_pointer<xcb_generic_error_t *> error;
auto r=xcb_sync_initialize_reply
(conn,
xcb_sync_initialize(conn,
XCB_SYNC_MAJOR_VERSION,
XCB_SYNC_MINOR_VERSION),
error.addressof());
if (!r || error)
{
xcb_render_util_disconnect(conn);
xcb_disconnect(conn);
if (r)
free(r);
if (error)
throw EXCEPTION(connection_error(error));
throw EXCEPTION(_("The display server does not support"
" the Sync extension"));
}
free(r);
}
}
connection_infoObj::~connection_infoObj()
{
xcb_render_util_disconnect(conn);
xcb_disconnect(conn);
}
uint32_t connection_infoObj::alloc_xid()
{
{
available_xids_t::lock lock(available_xids);
if (!lock->empty())
{
uint32_t xid=lock->front();
lock->pop();
return xid;
}
}
uint32_t id=xcb_generate_id(conn);
if (id == (uint32_t)-1)
throw EXCEPTION("xcb_generate_id() failed");
return id;
}
void connection_infoObj::release_xid(uint32_t xid) noexcept
{
available_xids_t::lock lock(available_xids);
lock->push(xid);
}
////////////////////////////////////////////////////////////////////////////
//
// Fetch properties.
void connection_infoObj
::get_property(xcb_window_t window_id,
xcb_atom_t property,
xcb_atom_t type,
uint32_t offset,
uint32_t length,
bool deleteflag,
const function<get_property_response> &response) const
{
returned_pointer<xcb_generic_error_t *> error;
auto value=return_pointer(xcb_get_property_reply
(conn,
xcb_get_property(conn,
deleteflag,
window_id,
property,
type,
offset,
length),
error.addressof()));
if (error)
throw EXCEPTION(connection_error(error));
response(value->type, value->format, value->bytes_after,
xcb_get_property_value(value),
xcb_get_property_value_length(value));
}
size_t connection_infoObj
::get_entire_property(xcb_window_t window_id,
xcb_atom_t property,
xcb_atom_t type,
bool deleteflag,
const function<get_entire_property_response> &response)
const
{
size_t bytes=0;
uint32_t offset=0;
bool bytes_after;
do
{
get_property_with(window_id, property, type,
offset/4,
16384,
deleteflag,
[&]
(xcb_atom_t type,
uint8_t format,
uint32_t bytes_afterArg,
void *data,
size_t data_size)
{
bytes += data_size;
offset += data_size / 4;
if (data_size)
response(type, format,
data, data_size);
bytes_after=bytes_afterArg
!= 0;
});
} while (bytes_after);
return bytes;;
}
void connection_infoObj
::collect_property(xcb_window_t window_id,
xcb_atom_t property,
xcb_atom_t type,
bool deleteflag,
const function<get_entire_property_response> &response)
const
{
std::vector<uint8_t> buffer;
xcb_atom_t type_ret=0;
xcb_atom_t format_ret=0;
bool received=false;
get_entire_property_with(window_id,
property,
type,
deleteflag,
[&]
(xcb_atom_t typeArg,
uint8_t formatArg,
void *data,
size_t data_size)
{
type_ret=typeArg;
format_ret=formatArg;
received=true;
auto p=reinterpret_cast<uint8_t *>
(data);
buffer.insert(buffer.end(),
p, p+data_size);
});
if (received)
response(type_ret,
format_ret,
reinterpret_cast<void *>(buffer.size() ?
&*buffer.begin():
nullptr),
buffer.size());
}
xcb_atom_t connection_infoObj::get_atom(const std::string_view &name,
bool only_if_exists) const
{
returned_pointer<xcb_generic_error_t *> error;
auto value=return_pointer(xcb_intern_atom_reply
(conn,
xcb_intern_atom(conn, only_if_exists ? 1:0,
name.size(),
name.data()),
error.addressof()));
if (error || !value)
return XCB_NONE;
return value->atom;
}
xcb_window_t connection_infoObj::get_selection_owner(xcb_atom_t atom) const
{
returned_pointer<xcb_generic_error_t *> error;
auto value=return_pointer
(xcb_get_selection_owner_reply
(conn, xcb_get_selection_owner(conn, atom),
error.addressof()));
if (error)
return XCB_NONE;
return value->owner;
}
std::string connection_infoObj::get_atom_name(xcb_atom_t atom) const
{
returned_pointer<xcb_generic_error_t *> error;
auto value=return_pointer(xcb_get_atom_name_reply
(conn, xcb_get_atom_name(conn, atom),
error.addressof()));
if (error)
return "(unknown)";
auto p=xcb_get_atom_name_name(value);
return std::string(p, p+xcb_get_atom_name_name_length(value));
}
LIBCXXW_NAMESPACE_END