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Port readWindowProperty in effects.cpp to XCB

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This commit is contained in:
Martin Gräßlin 2013-09-11 08:38:10 +02:00
parent 634a84e5c0
commit 5cf871d827
1 changed files with 19 additions and 24 deletions
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43
effects.cpp
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@ -169,33 +169,28 @@ void ScreenLockerWatcher::setLocked(bool activated)
//---------------------
// Static
static QByteArray readWindowProperty(Window win, long atom, long type, int format)
static QByteArray readWindowProperty(xcb_window_t win, xcb_atom_t atom, xcb_atom_t type, int format)
{
int len = 32768;
uint32_t len = 32768;
xcb_connection_t *c = connection();
for (;;) {
unsigned char* data;
Atom rtype;
int rformat;
unsigned long nitems, after;
if (XGetWindowProperty(QX11Info::display(), win,
atom, 0, len, False, AnyPropertyType,
&rtype, &rformat, &nitems, &after, &data) == Success) {
if (after > 0) {
XFree(data);
len *= 2;
continue;
}
if (long(rtype) == type && rformat == format) {
int bytelen = format == 8 ? nitems : format == 16 ? nitems * sizeof(short) : nitems * sizeof(long);
QByteArray ret(reinterpret_cast< const char* >(data), bytelen);
XFree(data);
return ret;
} else { // wrong format, type or something
XFree(data);
return QByteArray();
}
} else // XGetWindowProperty() failed
const auto cookie = xcb_get_property_unchecked(c, false, win, atom, XCB_ATOM_ANY, 0, len);
ScopedCPointer<xcb_get_property_reply_t> prop(xcb_get_property_reply(c, cookie, nullptr));
if (prop.isNull()) {
// get property failed
return QByteArray();
}
if (prop->bytes_after > 0) {
len *= 2;
continue;
}
if (prop->type == type && prop->format == format) {
const int nitems = xcb_get_property_value_length(prop.data());
int bytelen = format == 8 ? nitems : format == 16 ? nitems * sizeof(short) : nitems * sizeof(long);
return QByteArray(reinterpret_cast< const char* >(xcb_get_property_value(prop.data())), bytelen);
} else {
return QByteArray();
}
}
}