lottie: rectified scene building Logic

resolved a corner case where assets were being attached
multiple times during scene building. This issue was causing
a significant performence drop in image animation
in certain scenarios.

src/loaders/lottie/tvgLottieBuilder.cpp

@@ -1091,6 +1091,8 @@ static void _attachFont(LottieComposition* comp, LottieLayer* parent)
 static bool _buildComposition(LottieComposition* comp, LottieGroup* parent)
 {
     if (parent->children.count == 0) return false;
+    if (parent->buildDone) return true;
+    parent->buildDone = true;
 
     for (auto c = parent->children.data; c < parent->children.end(); ++c) {
         auto child = static_cast<LottieLayer*>(*c);

src/loaders/lottie/tvgLottieModel.h

@@ -531,6 +531,7 @@ struct LottieGroup : LottieObject
     Array<LottieObject*> children;
 
     bool reqFragment = false;   //requirment to fragment the render context
+    bool buildDone = false;     //completed in building the composition.
 };
 
 

src/renderer/sw_engine/tvgSwRasterTexmap.h

@@ -528,8 +528,8 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
                     vv = (int) v;
                     if (vv >= sh) continue;
 
-                    ar = (int)(255 * (1 - modff(u, &iptr)));
-                    ab = (int)(255 * (1 - modff(v, &iptr)));
+                    ar = (int)(255.0f * (1.0f - modff(u, &iptr)));
+                    ab = (int)(255.0f * (1.0f - modff(v, &iptr)));
                     iru = uu + 1;
                     irv = vv + 1;
 
@@ -576,8 +576,8 @@ static void _rasterPolygonImageSegment(SwSurface* surface, const SwImage* image,
                     uu = (int) u;
                     vv = (int) v;
 
-                    ar = (int)(255 * (1 - modff(u, &iptr)));
-                    ab = (int)(255 * (1 - modff(v, &iptr)));
+                    ar = (int)(255.0f * (1.0f - modff(u, &iptr)));
+                    ab = (int)(255.0f * (1.0f - modff(v, &iptr)));
                     iru = uu + 1;
                     irv = vv + 1;