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Fix possible division by zero

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On sway (a window manager), SDL_WINDOWEVENT_EXPOSED and
SDL_WINDOWEVENT_SIZE_CHANGED might not be called before a mouse event is
triggered. As a consequence, the "content rectangle" might not be
initialized when the mouse event is processed, causing a division by
zero.

To avoid the problem, initialize the content rect immediately when the
window is shown.

Fixes #4115 <https://github.com/Genymobile/scrcpy/issues/4115>
This commit is contained in:
Romain Vimont 2023-06-27 18:38:10 +02:00
parent 808bd14e30
commit 85b55b3c4e
1 changed files with 3 additions and 0 deletions
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3
app/src/screen.c
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@ -488,6 +488,7 @@ sc_screen_show_initial_window(struct sc_screen *screen) {
}
SDL_ShowWindow(screen->window);
sc_screen_update_content_rect(screen);
}
void
@ -848,6 +849,8 @@ sc_screen_convert_drawable_to_frame_coords(struct sc_screen *screen,
int32_t w = screen->content_size.width;
int32_t h = screen->content_size.height;
// screen->rect must be initialized to avoid a division by zero
assert(screen->rect.w && screen->rect.h);
x = (int64_t) (x - screen->rect.x) * w / screen->rect.w;
y = (int64_t) (y - screen->rect.y) * h / screen->rect.h;