remove unnecessary locks when setting video layer transparency

drastically improves performance when the layer alpha is frequently changed

1 files changed, 0 insertions, 2 deletions

diff --git a/main.c b/main.c
index 87ce683..10f1c57 100644
--- a/main.c
+++ b/main.c
@@ -721,12 +721,10 @@ layer_video_alpha(struct layer_video *ctx, float opacity)
 	Uint8 alpha = (Uint8)ceilf(opacity*SDL_ALPHA_OPAQUE);
 	ctx->alpha = opacity;
 
-	SDL_LockMutex(ctx->mutex);
 	if (alpha == SDL_ALPHA_OPAQUE)
 		SDL_SetAlpha(ctx->surf, 0, 0);
 	else
 		SDL_SetAlpha(ctx->surf, SDL_SRCALPHA | SDL_RLEACCEL, alpha);
-	SDL_UnlockMutex(ctx->mutex);
 }
 
 static void