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Don't change the display of a window until it is mostly on the new one

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Fixes https://github.com/libsdl-org/SDL/issues/12665
This commit is contained in:
Sam Lantinga
2025-10-03 11:51:44 -07:00
parent baae2a628d
commit b7b2e8bc31
1 changed files with 26 additions and 0 deletions
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26
src/video/SDL_video.c
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@@ -1800,6 +1800,32 @@ static void SDL_CheckWindowDisplayChanged(SDL_Window *window)
SDL_DisplayID displayID = SDL_GetDisplayForWindowPosition(window);
if (displayID != window->displayID) {
// See if we are fully committed to the new display
// 80% is about the right value, tested with 350% scale on the left monitor and 100% scale on the right
SDL_Rect old_bounds, new_bounds;
SDL_Rect window_rect;
SDL_Rect old_overlap, new_overlap;
if (SDL_GetDisplayBounds(window->displayID, &old_bounds) &&
SDL_GetDisplayBounds(displayID, &new_bounds)) {
window_rect.x = window->x;
window_rect.y = window->y;
window_rect.w = window->w;
window_rect.h = window->h;
if (SDL_GetRectIntersection(&old_bounds, &window_rect, &old_overlap) &&
SDL_GetRectIntersection(&new_bounds, &window_rect, &new_overlap)) {
int old_area = old_overlap.w * old_overlap.h;
int new_area = new_overlap.w * new_overlap.h;
float new_overlap_ratio = (new_area / ((float)old_area + new_area));
if (new_overlap_ratio < 0.80) {
return;
}
}
}
}
if (displayID != window->displayID) {
int i, display_index;