diff --git a/src/video/x11/SDL_x11mouse.c b/src/video/x11/SDL_x11mouse.c index 02d96da77..d3ec61902 100644 --- a/src/video/x11/SDL_x11mouse.c +++ b/src/video/x11/SDL_x11mouse.c @@ -382,8 +382,14 @@ X11_GetGlobalMouseState(int *x, int *y) retval |= (mask & Button1Mask) ? SDL_BUTTON_LMASK : 0; retval |= (mask & Button2Mask) ? SDL_BUTTON_MMASK : 0; retval |= (mask & Button3Mask) ? SDL_BUTTON_RMASK : 0; - *x = data->x + rootx; - *y = data->y + rooty; + /* SDL_DisplayData->x,y point to screen origin, and adding them to mouse coordinates relative to root window doesn't do the right thing + * (observed on dual monitor setup with primary display being the rightmost one - mouse was offset to the right). + * + * Adding root position to root-relative coordinates seems to be a better way to get absolute position. */ + XWindowAttributes root_attrs; + X11_XGetWindowAttributes(display, root, &root_attrs); + *x = root_attrs.x + rootx; + *y = root_attrs.y + rooty; return retval; } }