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Don't calculate relative mouse motion if we don't have a valid position 

Fixes https://github.com/libsdl-org/SDL/issues/1928
This commit is contained in:
Sam Lantinga 2022-08-22 12:49:41 -07:00
parent b204db1e6b
commit 0e61c106f5
1 changed files with 3 additions and 3 deletions
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6
src/events/SDL_mouse.c
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@ -361,8 +361,8 @@ SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relativ
{
SDL_Mouse *mouse = SDL_GetMouse();
int posted;
int xrel;
int yrel;
int xrel = 0;
int yrel = 0;
/* SDL_HINT_MOUSE_TOUCH_EVENTS: controlling whether mouse events should generate synthetic touch events */
if (mouse->mouse_touch_events) {
@ -416,7 +416,7 @@ SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relativ
yrel = y;
x = (mouse->last_x + xrel);
y = (mouse->last_y + yrel);
} else {
} else if (mouse->has_position) {
xrel = x - mouse->last_x;
yrel = y - mouse->last_y;
}