avplay: fix fullscreen behaviour with SDL 1.2.14 on Mac OS X

The blue channel went missing when toggling fullscreen on Mac OS X.

avplay.c

@@ -103,6 +103,7 @@ typedef struct VideoPicture {
     SDL_Overlay *bmp;
     int width, height; /* source height & width */
     int allocated;
+    int reallocate;
     enum PixelFormat pix_fmt;
 
 #if CONFIG_AVFILTER
@@ -1339,7 +1340,7 @@ static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, int64_t
     vp = &is->pictq[is->pictq_windex];
 
     /* alloc or resize hardware picture buffer */
-    if (!vp->bmp ||
+    if (!vp->bmp || vp->reallocate ||
 #if CONFIG_AVFILTER
         vp->width  != is->out_video_filter->inputs[0]->w ||
         vp->height != is->out_video_filter->inputs[0]->h) {
@@ -1350,6 +1351,7 @@ static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, int64_t
         SDL_Event event;
 
         vp->allocated  = 0;
+        vp->reallocate = 0;
 
         /* the allocation must be done in the main thread to avoid
            locking problems */
@@ -2681,6 +2683,12 @@ static void stream_cycle_channel(VideoState *is, int codec_type)
 static void toggle_full_screen(void)
 {
     is_full_screen = !is_full_screen;
+#if defined(__APPLE__) && SDL_VERSION_ATLEAST(1, 2, 14)
+    /* OSX needs to empty the picture_queue */
+    for (int i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++) {
+        cur_stream->pictq[i].reallocate = 1;
+    }
+#endif
     video_open(cur_stream);
 }