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xinput2_mouse: Treat XTEST as an absolute pointer device to fix VNC mouse injection

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This commit is contained in:
RichardG867
2023-02-03 20:55:39 -03:00
parent 77673bd0fd
commit e9a326622f
1 changed files with 47 additions and 13 deletions
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60
src/qt/xinput2_mouse.cpp
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@@ -76,22 +76,37 @@ parse_valuators(const double *input_values,
static bool exitthread = false;
static int
xinput2_get_xtest_pointer()
{
/* The XTEST pointer events injected by VNC servers to move the cursor always report
absolute coordinates, despite XTEST declaring relative axes (related: SDL issue 1836).
This looks for the XTEST pointer so that we can assume it's absolute as a workaround. */
int devs;
XIDeviceInfo *info = XIQueryDevice(disp, XIAllDevices, &devs), *dev;
for (int i = 0; i < devs; i++) {
dev = &info[i];
if ((dev->use == XISlavePointer) && !strcmp(dev->name, "Virtual core XTEST pointer"))
return dev->deviceid;
}
return -1;
}
void
xinput2_proc()
{
Window win;
win = DefaultRootWindow(disp);
int xtest_pointer = xinput2_get_xtest_pointer();
ximask.deviceid = XIAllMasterDevices;
ximask.mask_len = XIMaskLen(XI_LASTEVENT);
ximask.mask = (unsigned char *) calloc(ximask.mask_len, sizeof(unsigned char));
XISetMask(ximask.mask, XI_RawKeyPress);
XISetMask(ximask.mask, XI_RawKeyRelease);
XISetMask(ximask.mask, XI_RawButtonPress);
XISetMask(ximask.mask, XI_RawButtonRelease);
XISetMask(ximask.mask, XI_RawMotion);
XISetMask(ximask.mask, XI_Motion);
XISetMask(ximask.mask, XI_DeviceChanged);
XISelectEvents(disp, win, &ximask, 1);
@@ -134,7 +149,7 @@ common_motion:
const XIValuatorClassInfo *v = (const XIValuatorClassInfo *) xidevinfo->classes[i];
if (v->type == XIValuatorClass) {
/* Is this an absolute or relative axis? */
if (v->mode == XIModeRelative) {
if ((v->mode == XIModeRelative) && (rawev->sourceid != xtest_pointer)) {
/* Set relative coordinates. */
if (axis == 0)
xi2_mouse_x = xi2_mouse_x + coords[axis];
@@ -145,19 +160,30 @@ common_motion:
int disp_screen = XDefaultScreen(disp);
double abs_div;
if (axis == 0) {
abs_div = (v->max - v->min) / (double) XDisplayWidth(disp, disp_screen);
if (abs_div <= 0)
abs_div = 1;
abs_div = (coords[axis] - v->min) / abs_div;
if (v->mode == XIModeRelative) {
/* XTEST axes have dummy min/max values because they're nominally relative,
but in practice, the injected absolute coordinates are already in pixels. */
abs_div = coords[axis];
} else {
abs_div = (v->max - v->min) / (double) XDisplayWidth(disp, disp_screen);
if (abs_div <= 0)
abs_div = 1;
abs_div = (coords[axis] - v->min) / abs_div;
}
if (xi2_mouse_abs_x != 0)
xi2_mouse_x = xi2_mouse_x + (abs_div - xi2_mouse_abs_x);
xi2_mouse_abs_x = abs_div;
} else {
abs_div = (v->max - v->min) / (double) XDisplayHeight(disp, disp_screen);
if (abs_div <= 0)
abs_div = 1;
abs_div = (coords[axis] - v->min) / abs_div;
if (v->mode == XIModeRelative) {
/* Same as above. */
abs_div = coords[axis];
} else {
abs_div = (v->max - v->min) / (double) XDisplayHeight(disp, disp_screen);
if (abs_div <= 0)
abs_div = 1;
abs_div = (coords[axis] - v->min) / abs_div;
}
if (xi2_mouse_abs_y != 0)
xi2_mouse_y = xi2_mouse_y + (abs_div - xi2_mouse_abs_y);
@@ -181,6 +207,14 @@ common_motion:
XFlush(disp);
}
break;
}
case XI_DeviceChanged:
{
/* Re-scan for XTEST pointer, just in case. */
xtest_pointer = xinput2_get_xtest_pointer();
break;
}
}