Implement SDL_Surface refcounting

1 files changed, 7 insertions, 0 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index b7d73862..34c9551a 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -361,6 +361,13 @@ var LibrarySDL = {
     },
 
     freeSurface: function(surf) {
+      var refcountPointer = surf + Runtime.QUANTUM_SIZE * 14;
+      var refcount = {{{ makeGetValue('refcountPointer', '0', 'i32') }}};
+      if (refcount > 0) {
+        {{{ makeSetValue('refcountPointer', '0', 'refcount - 1', 'i32') }}};
+        return;
+      }
+
       var info = SDL.surfaces[surf];
       if (!info.usePageCanvas && info.canvas) SDL.canvasPool.push(info.canvas);
       _free(info.buffer);