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x11: prevent a synthetic mouse event when using a touchscreen

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With multitouch, register to receive XI_Motion (which desctivates MotionNotify),
so that we can distinguish real mouse motions from synthetic one.

(bug 4690)
This commit is contained in:
Sylvain Becker 2019-07-10 10:06:28 +02:00
parent 6ef01e5236
commit 86965eecd3
1 changed files with 53 additions and 25 deletions
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76
src/video/x11/SDL_x11xinput2.c
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@ -75,30 +75,38 @@ xinput2_version_atleast(const int version, const int wantmajor, const int wantmi
}
#if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
static void
xinput2_normalize_touch_coordinates(SDL_VideoData *videodata, Window window,
double in_x, double in_y, float *out_x, float *out_y)
static SDL_Window *
xinput2_get_sdlwindow(SDL_VideoData *videodata, Window window)
{
int i;
for (i = 0; i < videodata->numwindows; i++) {
SDL_WindowData *d = videodata->windowlist[i];
if (d->xwindow == window) {
if (d->window->w == 1) {
*out_x = 0.5f;
} else {
*out_x = in_x / (d->window->w - 1);
}
if (d->window->h == 1) {
*out_y = 0.5f;
} else {
*out_y = in_y / (d->window->h - 1);
}
return;
return d->window;
}
}
// couldn't find the window...
*out_x = in_x;
*out_y = in_y;
return NULL;
}
static void
xinput2_normalize_touch_coordinates(SDL_Window *window, double in_x, double in_y, float *out_x, float *out_y)
{
if (window) {
if (window->w == 1) {
*out_x = 0.5f;
} else {
*out_x = in_x / (window->w - 1);
}
if (window->h == 1) {
*out_y = 0.5f;
} else {
*out_y = in_y / (window->h - 1);
}
} else {
// couldn't find the window...
*out_x = in_x;
*out_y = in_y;
}
}
#endif /* SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH */
@ -198,11 +206,30 @@ X11_HandleXinput2Event(SDL_VideoData *videodata,XGenericEventCookie *cookie)
break;
#if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
/* With multitouch, register to receive XI_Motion (which desctivates MotionNotify),
* so that we can distinguish real mouse motions from synthetic one. */
case XI_Motion: {
const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
int pointer_emulated = (xev->flags & XIPointerEmulated);
if (! pointer_emulated) {
SDL_Mouse *mouse = SDL_GetMouse();
if(!mouse->relative_mode || mouse->relative_mode_warp) {
SDL_Window *window = xinput2_get_sdlwindow(videodata, xev->event);
if (window) {
SDL_SendMouseMotion(window, 0, 0, xev->event_x, xev->event_y);
}
}
}
return 1;
}
break;
case XI_TouchBegin: {
const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
float x, y;
xinput2_normalize_touch_coordinates(videodata, xev->event,
xev->event_x, xev->event_y, &x, &y);
SDL_Window *window = xinput2_get_sdlwindow(videodata, xev->event);
xinput2_normalize_touch_coordinates(window, xev->event_x, xev->event_y, &x, &y);
SDL_SendTouch(xev->sourceid,xev->detail, SDL_TRUE, x, y, 1.0);
return 1;
}
@ -210,8 +237,8 @@ X11_HandleXinput2Event(SDL_VideoData *videodata,XGenericEventCookie *cookie)
case XI_TouchEnd: {
const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
float x, y;
xinput2_normalize_touch_coordinates(videodata, xev->event,
xev->event_x, xev->event_y, &x, &y);
SDL_Window *window = xinput2_get_sdlwindow(videodata, xev->event);
xinput2_normalize_touch_coordinates(window, xev->event_x, xev->event_y, &x, &y);
SDL_SendTouch(xev->sourceid,xev->detail, SDL_FALSE, x, y, 1.0);
return 1;
}
@ -219,8 +246,8 @@ X11_HandleXinput2Event(SDL_VideoData *videodata,XGenericEventCookie *cookie)
case XI_TouchUpdate: {
const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
float x, y;
xinput2_normalize_touch_coordinates(videodata, xev->event,
xev->event_x, xev->event_y, &x, &y);
SDL_Window *window = xinput2_get_sdlwindow(videodata, xev->event);
xinput2_normalize_touch_coordinates(window, xev->event_x, xev->event_y, &x, &y);
SDL_SendTouchMotion(xev->sourceid,xev->detail, x, y, 1.0);
return 1;
}
@ -272,7 +299,7 @@ X11_Xinput2SelectTouch(_THIS, SDL_Window *window)
#if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
SDL_VideoData *data = NULL;
XIEventMask eventmask;
unsigned char mask[3] = { 0,0,0 };
unsigned char mask[4] = { 0, 0, 0, 0 };
SDL_WindowData *window_data = NULL;
if (!X11_Xinput2IsMultitouchSupported()) {
@ -289,6 +316,7 @@ X11_Xinput2SelectTouch(_THIS, SDL_Window *window)
XISetMask(mask, XI_TouchBegin);
XISetMask(mask, XI_TouchUpdate);
XISetMask(mask, XI_TouchEnd);
XISetMask(mask, XI_Motion);
X11_XISelectEvents(data->display,window_data->xwindow,&eventmask,1);
#endif