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events: Don't lose window RESIZED events during SIZED_CHANGED processing. 

Previously, calling SDL_SendWindowEvent for a SIZED_CHANGED event would
filter the queue to remove RESIZED and SIZED_CHANGED events, so you don't
overflow the queue with obsolete data, but any RESIZED events would be
lost in this process.

Now we note if there was a RESIZED pending and replace it with a new
event using the same dimensions as the new SIZED_CHANGED event. This fixes
cases where an app is only listening for RESIZED events and thus might
lose important information in some cases.

Fixes #5925.
This commit is contained in:
Ryan C. Gordon 2022-07-31 22:10:45 -04:00
parent 17f36c105c
commit cf63af8ae2
No known key found for this signature in database
GPG Key ID: FA148B892AB48044
1 changed files with 28 additions and 5 deletions
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33
src/events/SDL_windowevents.c
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@ -27,15 +27,27 @@
#include "SDL_mouse_c.h"
#include "SDL_hints.h"
static int SDLCALL
RemovePendingSizeChangedAndResizedEvents(void * userdata, SDL_Event *event)
typedef struct RemovePendingSizeChangedAndResizedEvents_Data
{
SDL_Event *new_event = (SDL_Event *)userdata;
const SDL_Event *new_event;
SDL_bool saw_resized;
} RemovePendingSizeChangedAndResizedEvents_Data;
static int SDLCALL
RemovePendingSizeChangedAndResizedEvents(void *_userdata, SDL_Event *event)
{
RemovePendingSizeChangedAndResizedEvents_Data *userdata = (RemovePendingSizeChangedAndResizedEvents_Data *) _userdata;
const SDL_Event *new_event = userdata->new_event;
if (event->type == SDL_WINDOWEVENT &&
(event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED ||
event->window.event == SDL_WINDOWEVENT_RESIZED) &&
event->window.windowID == new_event->window.windowID) {
if (event->window.event == SDL_WINDOWEVENT_RESIZED) {
userdata->saw_resized = SDL_TRUE;
}
/* We're about to post a new size event, drop the old one */
return 0;
}
@ -188,7 +200,18 @@ SDL_SendWindowEvent(SDL_Window * window, Uint8 windowevent, int data1,
/* Fixes queue overflow with resize events that aren't processed */
if (windowevent == SDL_WINDOWEVENT_SIZE_CHANGED) {
SDL_FilterEvents(RemovePendingSizeChangedAndResizedEvents, &event);
/* !!! FIXME: in SDL3, let's make RESIZED/SIZE_CHANGED into one event with a flag to distinguish between them, and remove all this tapdancing. */
RemovePendingSizeChangedAndResizedEvents_Data userdata;
userdata.new_event = &event;
userdata.saw_resized = SDL_FALSE;
SDL_FilterEvents(RemovePendingSizeChangedAndResizedEvents, &userdata);
if (userdata.saw_resized) { /* if there was a pending resize, make sure one at the new dimensions remains. */
event.window.event = SDL_WINDOWEVENT_RESIZED;
if (SDL_PushEvent(&event) <= 0) {
return 0; /* oh well. */
}
event.window.event = SDL_WINDOWEVENT_SIZE_CHANGED; /* then push the actual event next. */
}
}
if (windowevent == SDL_WINDOWEVENT_MOVED) {
SDL_FilterEvents(RemovePendingMoveEvents, &event);
@ -207,7 +230,7 @@ SDL_SendWindowEvent(SDL_Window * window, Uint8 windowevent, int data1,
}
}
return (posted);
return posted;
}
/* vi: set ts=4 sw=4 expandtab: */