add emscripten_get_preloaded_image_data

2 files changed, 45 insertions, 0 deletions

diff --git a/src/library_browser.js b/src/library_browser.js
index 4ef7c577..620fd828 100644
--- a/src/library_browser.js
+++ b/src/library_browser.js
@@ -1175,6 +1175,35 @@ mergeInto(LibraryManager.library, {
     var info = Browser.workers[id];
     if (!info) return -1;
     return info.awaited;
+  },
+
+  emscripten_get_preloaded_image_data: function(path, w, h) {
+    if (typeof path == "number") {
+      path = Pointer_stringify(path);
+    }
+
+    var canvas = Module["preloadedImages"][path];
+    if (canvas) {
+      var ctx = canvas.getContext("2d");
+      var image = ctx.getImageData(0, 0, canvas.width, canvas.height);
+      var buf = _malloc(canvas.width * canvas.height * 4);
+
+      HEAPU8.set(image.data, buf);
+
+      {{{ makeSetValue('w', '0', 'canvas.width', 'i32') }}};
+      {{{ makeSetValue('h', '0', 'canvas.height', 'i32') }}};
+      return buf;
+    }
+  },
+
+  emscripten_get_preloaded_image_data_from_FILE__deps: ['emscripten_get_preloaded_image_data'],
+  emscripten_get_preloaded_image_data_from_FILE: function(file, w, h) {
+    var stream = FS.getStreamFromPtr(file);
+    if(stream) {
+      return _emscripten_get_preloaded_image_data(stream.path, w, h);
+    }
+
+    return 0;
   }
 });
 
diff --git a/system/include/emscripten/emscripten.h b/system/include/emscripten/emscripten.h
index 6e1c00d5..56f2e048 100644
--- a/system/include/emscripten/emscripten.h
+++ b/system/include/emscripten/emscripten.h
@@ -515,6 +515,22 @@ int emscripten_get_compiler_setting(const char *name);
  */
 void emscripten_debugger();
 
+/*
+ * Get preloaded image data and the size of the image.
+ *
+ * Returns pointer to loaded image or NULL.
+ * Pointer should be free()'d
+ */
+char *emscripten_get_preloaded_image_data(char *path, int *w, int *h);
+
+/*
+ * Get preloaded image data from a c FILE *.
+ *
+ * Returns pointer to loaded image or NULL.
+ * Pointer should be free()'d
+ */
+char *emscripten_get_preloaded_image_data_from_FILE(FILE *file, int *w, int *h);
+
 
 /* ===================================== */
 /* Internal APIs. Be careful with these. */