preload images for SDL

2 files changed, 6 insertions, 8 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index e741faeb..3f5a8a87 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -478,14 +478,8 @@ mergeInto(LibraryManager.library, {
 
   IMG_Load: function(filename) {
     filename = Pointer_stringify(filename);
-    var format = filename.split('.').slice(-1)[0];
-    var file = FS.analyzePath(filename);
-    if (!file || !file.object) {
-      console.log('Cannot find file: ' + filename);
-      return 0;
-    }
-    var data = file.object.contents;
-    var raw = Browser.decodeImage(data, format);
+    var raw = preloadedImages[filename];
+    assert(raw, 'Cannot find preloaded image ' + filename);
     var surf = SDL.makeSurface(raw.width, raw.height, 0);
     // XXX Extremely inefficient!
     for (var i = 0; i < raw.width*raw.height*4; i++) {
diff --git a/src/preamble.js b/src/preamble.js
index 1e68295f..1c599836 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -892,5 +892,9 @@ function removeRunDependency() {
   if (runDependencies == 0) run();
 }
 
+// Preloading
+
+var preloadedImages = {}; // maps url to image data
+
 // === Body ===