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Workaround continuous resizing on Windows/MacOS

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On Windows and MacOS, resizing blocks the event loop, so resizing events
are not triggered:
 - <https://bugzilla.libsdl.org/show_bug.cgi?id=2077>
 - <https://stackoverflow.com/a/40693139/1987178>

As a workaround, register an event watcher to render the screen from
another thread.

Since the whole event loop is blocked during resizing, the screen
content is not refreshed (on Windows and MacOS) until resizing ends.
This commit is contained in:
Romain Vimont 2018-03-13 21:26:05 +01:00
parent b858204786
commit 0b1e59186f
1 changed files with 22 additions and 0 deletions
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22
app/src/scrcpy.c
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@ -35,7 +35,29 @@ static struct input_manager input_manager = {
.screen = &screen,
};
#if defined(__APPLE__) || defined(__WINDOWS__)
# define CONTINUOUS_RESIZING_WORKAROUND
#endif
#ifdef CONTINUOUS_RESIZING_WORKAROUND
// On Windows and MacOS, resizing blocks the event loop, so resizing events are
// not triggered. As a workaround, handle them in an event handler.
//
// <https://bugzilla.libsdl.org/show_bug.cgi?id=2077>
// <https://stackoverflow.com/a/40693139/1987178>
static int event_watcher(void* data, SDL_Event* event) {
if (event->type == SDL_WINDOWEVENT && event->window.event == SDL_WINDOWEVENT_RESIZED) {
// called from another thread, not very safe, but it's a workaround!
screen_render(&screen);
}
return 0;
}
#endif
static void event_loop(void) {
#ifdef CONTINUOUS_RESIZING_WORKAROUND
SDL_AddEventWatch(event_watcher, screen.window);
#endif
SDL_Event event;
while (SDL_WaitEvent(&event)) {
switch (event.type) {