loader/lottie: ++safety

- add an execeptional hanlding at parsing the assets.
- The precomp layer failed to prepare its instance in the parsing stage. This corrects the mistake.

src/lib/tvgAnimation.cpp

@@ -31,7 +31,6 @@
 
 struct Animation::Impl
 {
-    //TODO: Memory Safety
     Picture picture;
 };
 
@@ -41,7 +40,7 @@ struct Animation::Impl
 
 Animation::~Animation()
 {
-
+    //FIXME: free pImpl
 }
 
 

src/loaders/lottie/tvgLottieBuilder.cpp

@@ -370,15 +370,15 @@ static void _buildReference(LottieComposition* comp, LottieLayer* layer)
 {
     for (auto asset = comp->assets.data; asset < comp->assets.end(); ++asset) {
         if (strcmp(layer->refId, (*asset)->name)) continue;
-        auto assetLayer = static_cast<LottieLayer*>(*asset);
         if (layer->type == LottieLayer::Precomp) {
+            auto assetLayer = static_cast<LottieLayer*>(*asset);
             if (_buildPrecomp(comp, assetLayer)) {
                 layer->children = assetLayer->children;
             }
         } else if (layer->type == LottieLayer::Image) {
             layer->children.push(*asset);
         }
-        layer->statical &= assetLayer->statical;
+        layer->statical &= (*asset)->statical;
         break;
     }
 }

src/loaders/lottie/tvgLottieModel.h

@@ -349,12 +349,6 @@ struct LottieLayer : LottieGroup
 {
     enum Type : uint8_t {Precomp = 0, Solid, Image, Null, Shape, Text};
 
-    LottieLayer()
-    {
-        autoOrient  = false;
-        mask = false;
-    }
-
     ~LottieLayer()
     {
         if (refId) {
@@ -418,9 +412,8 @@ struct LottieLayer : LottieGroup
     } cache;
 
     Type type = Null;
-
+    bool autoOrient = false;
-    bool autoOrient : 1;
+    bool mask = false;
-    bool mask : 1;
 };
 
 

src/loaders/lottie/tvgLottieParser.cpp

@@ -806,9 +806,6 @@ void LottieParser::parseObject(LottieGroup* parent)
 
 LottieImage* LottieParser::parseImage(const char* key)
 {
-    auto image = new LottieImage;
-    if (!image) return nullptr;
-
     //Used for Image Asset
     const char* data = nullptr;
     const char* subPath = nullptr;
@@ -821,15 +818,14 @@ LottieImage* LottieParser::parseImage(const char* key)
             data = getString();
         } else if (!strcmp(key, "e")) {
             embedded = getInt();
-#if 0
-        } else if (!strcmp(key, "w"))  {
-            auto w = getInt();
-        } else if (!strcmp(key, "h")) {
-            auto h = getInt();
-#endif
         } else skip(key);
     } while ((key = nextObjectKey()));
 
+    if (!data) return nullptr;
+
+    auto image = new LottieImage;
+    if (!image) return nullptr;
+
     //embeded image resource. should start with "data:"
     //header look like "data:image/png;base64," so need to skip till ','.
     if (embedded && !strncmp(data, "data:", 5)) {
@@ -877,13 +873,15 @@ LottieObject* LottieParser::parseAsset()
         //Precomposition asset
         } else if (!strcmp(key, "layers")) {
             obj = parseLayers();
+        } else if (!strcmp(key, "w") || !strcmp(key, "h") || !strcmp(key, "nm") || !strcmp(key, "fr")) {
+            skip(key);
         //Image asset
         } else {
             obj = parseImage(key);
             break;
         }
     }
-    obj->name = id;
+    if (obj) obj->name = id;
     return obj;
 }
 
@@ -1007,6 +1005,8 @@ LottieLayer* LottieParser::parseLayers()
             root->children.push(layer);
         }
     }
+
+    root->prepare();
     return root;
 }