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annotate dep/animone/src/win/x11.cc @ 336:d260549151d6

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dep/animone: fix undefined behavior, get correct length value
author Paper <paper@paper.us.eu.org>
date Wed, 19 Jun 2024 06:32:25 -0400
parents a4257370de16
children a7d4e5107531
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a4257370de16 dep/animone: prepare for v1.0 release; it should be ready by now
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1 /*
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2 * win/x11.c: support for X11 using XCB
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3 *
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4 * some things might be wrong here due to
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5 * having to use recursive logic, but whatever
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6 */
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7 #include "animone/win/x11.h"
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8 #include "animone.h"
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9 #include "animone/fd.h" /* GetProcessName() */
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10 #include "animone/win.h"
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11
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12 #include <xcb/res.h>
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13 #include <xcb/xcb.h>
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14
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15 #include <climits>
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16 #include <cstdint>
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17 #include <cstring>
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18 #include <cstdlib>
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19 #include <set>
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20 #include <string>
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21 #include <memory>
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22
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23 #include <chrono>
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24
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25 #include <iostream>
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26
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27 static size_t str_nlen(const char* s, size_t len) {
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28 size_t i = 0;
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29 for (; i < len && s[i]; i++)
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30 ;
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31 return i;
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32 }
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33
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34 namespace animone::internal::x11 {
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35
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36 template<typename T>
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37 struct XcbDestructor {
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38 using pointer = T*;
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39 void operator()(pointer t) const { std::free(t); };
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40 };
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41
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42 template<typename T>
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43 using XcbPtr = std::unique_ptr<T, XcbDestructor<T>>;
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44
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45 static bool GetAllTopLevelWindowsEWMH(xcb_connection_t* connection, const std::vector<xcb_window_t>& roots,
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46 std::set<xcb_window_t>& result) {
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47 const xcb_atom_t Atom__NET_CLIENT_LIST = [connection] {
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48 static constexpr std::string_view name = "_NET_CLIENT_LIST";
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49 xcb_intern_atom_cookie_t cookie = ::xcb_intern_atom(connection, true, name.size(), name.data());
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50 XcbPtr<xcb_intern_atom_reply_t> reply(::xcb_intern_atom_reply(connection, cookie, NULL));
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51
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52 xcb_atom_t atom = reply->atom;
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53
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54 return atom;
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55 }();
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56 if (Atom__NET_CLIENT_LIST == XCB_ATOM_NONE)
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57 return false; // BTFO
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58
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59 bool success = false;
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60
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61 std::vector<xcb_get_property_cookie_t> cookies;
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62 cookies.reserve(roots.size());
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63
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64 for (const auto& root : roots)
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65 cookies.push_back(::xcb_get_property(connection, 0, root, Atom__NET_CLIENT_LIST, XCB_ATOM_ANY, 0L, UINT_MAX));
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66
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67 for (const auto& cookie : cookies) {
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68 XcbPtr<xcb_get_property_reply_t> reply(::xcb_get_property_reply(connection, cookie, NULL));
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69
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70 if (reply) {
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71 xcb_window_t* value = reinterpret_cast<xcb_window_t*>(::xcb_get_property_value(reply.get()));
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72 int len = ::xcb_get_property_value_length(reply.get()) / sizeof(xcb_window_t);
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73
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74 for (size_t i = 0; i < len; i++)
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75 result.insert(value[i]);
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76
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77 success |= true;
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78 }
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79 }
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80
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81 return success;
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82 }
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83
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84 /* This is called on every window. What this does is:
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85 * 1. Gets the tree of children
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86 * 2. Searches all children recursively for a WM_STATE property
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87 * 3. If that failed... return the original window
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88 */
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89 static bool WalkWindows(xcb_connection_t* connection, int depth, xcb_atom_t Atom_WM_STATE, const xcb_window_t* windows,
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90 int windows_len, std::set<xcb_window_t>& result) {
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91 /* The depth we should start returning at. */
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92 static constexpr int CUTOFF = 1;
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93
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94 bool success = false;
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95
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96 std::vector<xcb_query_tree_cookie_t> cookies;
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97 cookies.reserve(windows_len);
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98
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99 for (int i = 0; i < windows_len; i++)
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100 cookies.push_back(::xcb_query_tree(connection, windows[i]));
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101
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102 for (const auto& cookie : cookies) {
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103 XcbPtr<xcb_query_tree_reply_t> query_tree_reply(::xcb_query_tree_reply(connection, cookie, NULL));
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104
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105 xcb_window_t* tree_children = ::xcb_query_tree_children(query_tree_reply.get());
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106 int tree_children_len = ::xcb_query_tree_children_length(query_tree_reply.get());
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107
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108 std::vector<xcb_get_property_cookie_t> state_property_cookies;
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109 state_property_cookies.reserve(tree_children_len);
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110
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111 for (int i = 0; i < tree_children_len; i++)
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112 state_property_cookies.push_back(
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113 ::xcb_get_property(connection, 0, tree_children[i], Atom_WM_STATE, Atom_WM_STATE, 0, 0));
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114
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115 for (int i = 0; i < tree_children_len; i++) {
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116 XcbPtr<xcb_get_property_reply_t> get_property_reply(::xcb_get_property_reply(connection, state_property_cookies[i], NULL));
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117
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118 /* X11 is unfriendly here. what this means is "did the property exist?" */
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119 if (get_property_reply->format || get_property_reply->type || get_property_reply->length) {
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120 result.insert(tree_children[i]);
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121 if (depth >= CUTOFF)
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122 return true;
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123
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124 success |= true;
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125 continue;
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126 }
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127 }
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128
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129 if (WalkWindows(connection, depth + 1, Atom_WM_STATE, tree_children, tree_children_len, result)) {
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130 success |= true;
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131 if (depth >= CUTOFF)
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132 return true;
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133 continue;
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134 }
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135 }
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136
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137 return success;
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138 }
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139
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140 static bool GetAllTopLevelWindowsICCCM(xcb_connection_t* connection, const std::vector<xcb_window_t>& roots,
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141 std::set<xcb_window_t>& result) {
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142 bool success = false;
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143
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Paper <paper@paper.us.eu.org>
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144 xcb_atom_t Atom_WM_STATE = [connection] {
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Paper <paper@paper.us.eu.org>
parents: 283
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145 static constexpr std::string_view name = "WM_STATE";
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146 xcb_intern_atom_cookie_t cookie = ::xcb_intern_atom(connection, true, name.size(), name.data());
336
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diff changeset
147 XcbPtr<xcb_intern_atom_reply_t> reply(::xcb_intern_atom_reply(connection, cookie, NULL));
301
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148
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149 xcb_atom_t atom = reply->atom;
336
d260549151d6 dep/animone: fix undefined behavior, get correct length value
Paper <paper@paper.us.eu.org>
parents: 310
diff changeset
150
301
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diff changeset
151 return atom;
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Paper <paper@paper.us.eu.org>
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152 }();
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Paper <paper@paper.us.eu.org>
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153 if (Atom_WM_STATE == XCB_ATOM_NONE)
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154 return success;
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155
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Paper <paper@paper.us.eu.org>
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156 std::vector<xcb_query_tree_cookie_t> cookies;
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157 cookies.reserve(roots.size());
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Paper <paper@paper.us.eu.org>
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158
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Paper <paper@paper.us.eu.org>
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159 for (const auto& root : roots)
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Paper <paper@paper.us.eu.org>
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160 cookies.push_back(::xcb_query_tree(connection, root));
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Paper <paper@paper.us.eu.org>
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161
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162 for (const auto& cookie : cookies)
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163 success |= WalkWindows(connection, 0, Atom_WM_STATE, roots.data(), roots.size(), result);
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164
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165 return success;
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Paper <paper@paper.us.eu.org>
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166 }
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167
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Paper <paper@paper.us.eu.org>
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168 bool EnumerateWindows(window_proc_t window_proc) {
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Paper <paper@paper.us.eu.org>
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169 if (!window_proc)
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170 return false;
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171
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172 xcb_connection_t* connection = ::xcb_connect(NULL, NULL);
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173 if (xcb_connection_has_error(connection))
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174 return false;
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Paper <paper@paper.us.eu.org>
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175
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176 std::set<xcb_window_t> windows;
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177 {
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178 std::vector<xcb_window_t> roots;
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179 {
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180 xcb_screen_iterator_t iter = ::xcb_setup_roots_iterator(::xcb_get_setup(connection));
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181 for (; iter.rem; ::xcb_screen_next(&iter))
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Paper <paper@paper.us.eu.org>
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182 roots.push_back(iter.data->root);
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183 }
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184
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Paper <paper@paper.us.eu.org>
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185 if (!GetAllTopLevelWindowsEWMH(connection, roots, windows))
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186 GetAllTopLevelWindowsICCCM(connection, roots, windows);
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187 }
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188
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189 struct WindowCookies {
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190 xcb_window_t window;
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Paper <paper@paper.us.eu.org>
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191 xcb_get_property_cookie_t class_property_cookie;
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Paper <paper@paper.us.eu.org>
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192 xcb_get_property_cookie_t name_property_cookie;
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193 xcb_res_query_client_ids_cookie_t pid_property_cookie;
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194 };
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Paper <paper@paper.us.eu.org>
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195
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Paper <paper@paper.us.eu.org>
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196 std::vector<WindowCookies> window_cookies;
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Paper <paper@paper.us.eu.org>
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197 window_cookies.reserve(windows.size());
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Paper <paper@paper.us.eu.org>
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198
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Paper <paper@paper.us.eu.org>
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199 for (const auto& window : windows) {
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200 xcb_res_client_id_spec_t spec = {.client = window, .mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID};
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
201
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Paper <paper@paper.us.eu.org>
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diff changeset
202 WindowCookies window_cookie = {
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Paper <paper@paper.us.eu.org>
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diff changeset
203 window, ::xcb_get_property(connection, 0, window, XCB_ATOM_WM_CLASS, XCB_ATOM_STRING, 0L, 2048L),
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
204 ::xcb_get_property(connection, 0, window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 0L, UINT_MAX),
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
205 ::xcb_res_query_client_ids(connection, 1, &spec)};
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
206
b1f625b0227c *: convert all files CRLF -> LF
Paper <paper@paper.us.eu.org>
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207 window_cookies.push_back(window_cookie);
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Paper <paper@paper.us.eu.org>
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208 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
209
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Paper <paper@paper.us.eu.org>
parents: 283
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210 for (const auto& window_cookie : window_cookies) {
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Paper <paper@paper.us.eu.org>
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diff changeset
211 Window win = {0};
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Paper <paper@paper.us.eu.org>
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212 win.id = window_cookie.window;
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
213 {
b1f625b0227c *: convert all files CRLF -> LF
Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
214 /* Class name */
336
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Paper <paper@paper.us.eu.org>
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diff changeset
215 XcbPtr<xcb_get_property_reply_t> reply(::xcb_get_property_reply(connection, window_cookie.class_property_cookie, NULL));
301
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
216
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
217 if (reply && reply->format == 8) {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
218 const char* data = reinterpret_cast<const char*>(::xcb_get_property_value(reply.get()));
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
219 const int data_len = ::xcb_get_property_value_length(reply.get());
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
220
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
221 int instance_len = str_nlen(data, data_len);
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
222 const char* class_name = data + instance_len + 1;
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
223
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
224 win.class_name = std::string(class_name, str_nlen(class_name, data_len - (instance_len + 1)));
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
225 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
226 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
227 {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
228 /* Title text */
336
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Paper <paper@paper.us.eu.org>
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diff changeset
229 XcbPtr<xcb_get_property_reply_t> reply(::xcb_get_property_reply(connection, window_cookie.name_property_cookie, NULL));
301
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
230
b1f625b0227c *: convert all files CRLF -> LF
Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
231 if (reply) {
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Paper <paper@paper.us.eu.org>
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diff changeset
232 const char* data = reinterpret_cast<const char*>(::xcb_get_property_value(reply.get()));
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
233 int len = ::xcb_get_property_value_length(reply.get());
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
234
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
235 win.text = std::string(data, len);
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
236 }
b1f625b0227c *: convert all files CRLF -> LF
Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
237 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
238 Process proc = {0};
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
239 {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
240 /* PID */
336
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Paper <paper@paper.us.eu.org>
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diff changeset
241 XcbPtr<xcb_res_query_client_ids_reply_t> reply(::xcb_res_query_client_ids_reply(connection, window_cookie.pid_property_cookie, NULL));
301
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
242
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
243 if (reply) {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
244 xcb_res_client_id_value_iterator_t it = ::xcb_res_query_client_ids_ids_iterator(reply.get());
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
245 for (; it.rem; ::xcb_res_client_id_value_next(&it)) {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
246 if (it.data->spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
247 proc.pid = *::xcb_res_client_id_value_value(it.data);
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
248 GetProcessName(proc.pid, proc.name); /* fill this in if we can */
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Paper <paper@paper.us.eu.org>
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diff changeset
249 break;
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Paper <paper@paper.us.eu.org>
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diff changeset
250 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
251 }
b1f625b0227c *: convert all files CRLF -> LF
Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
252 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
253 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
254
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
255 if (!window_proc(proc, win)) {
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
256 ::xcb_disconnect(connection);
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Paper <paper@paper.us.eu.org>
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diff changeset
257 return false;
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Paper <paper@paper.us.eu.org>
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diff changeset
258 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
259 }
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
260
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
261 ::xcb_disconnect(connection);
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Paper <paper@paper.us.eu.org>
parents: 283
diff changeset
262
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Paper <paper@paper.us.eu.org>
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diff changeset
263 return true;
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Paper <paper@paper.us.eu.org>
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diff changeset
264 }
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Paper <paper@paper.us.eu.org>
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diff changeset
265
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Paper <paper@paper.us.eu.org>
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266 } // namespace animone::internal::x11