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x11: Normalize x11xinput2 touch x to be 1.0 at width (thanks, Zach!). 

"Applications (such as SDL's testgesture) do "event.tfinger.x * window_width"
to find window coord. Currently the X11 XInput2 backend expects application
to do "event.tfinger.x * (window_width-1)" instead.

X11 XInput2 touch events are normalized so x is 1.0 at "width - 1" but other
SDL backends appear to have x be 1.0 at "width". Same issue for touch event
y with regards to height."

Fixes Bugzilla #4183.
This commit is contained in:
Ryan C. Gordon 2018-06-24 13:57:22 -04:00
parent fe6828272a
commit 59574fe2f0
1 changed files with 2 additions and 10 deletions
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12
src/video/x11/SDL_x11xinput2.c
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@ -83,16 +83,8 @@ xinput2_normalize_touch_coordinates(SDL_VideoData *videodata, Window window,
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);
}
*out_x = in_x / d->window->w;
*out_y = in_y / d->window->h;
return;
}
}