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-rw-r--r--src/library_sdl.js3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/library_sdl.js b/src/library_sdl.js
index de644aac..646aa54c 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -1066,6 +1066,9 @@ var LibrarySDL = {
},
SDL_SetColorKey: function(surf, flag, key) {
+ // SetColorKey assigns one color to be rendered as transparent. I don't
+ // think the canvas API allows for anything like this, and iterating through
+ // each pixel to replace that color seems prohibitively expensive.
Runtime.warnOnce('SDL_SetColorKey is a no-op for performance reasons');
return 0;
},