lottie: support Tritone LayerEffect

issue: https://github.com/thorvg/thorvg/issues/2718

src/loaders/lottie/tvgLottieBuilder.cpp

@@ -1327,6 +1327,14 @@ void LottieBuilder::updateEffect(LottieLayer* layer, float frameNo)
                 layer->scene->push(SceneEffect::Fill, color.rgb[0], color.rgb[1], color.rgb[2], (int)(255.0f *effect->opacity(frameNo)));
                 break;
             }
+            case LottieEffect::Tritone: {
+                auto effect = static_cast<LottieFxTritone*>(*ef);
+                auto dark = effect->dark(frameNo);
+                auto midtone = effect->midtone(frameNo);
+                auto bright = effect->bright(frameNo);
+                layer->scene->push(SceneEffect::Tritone, dark.rgb[0], dark.rgb[1], dark.rgb[2], midtone.rgb[0], midtone.rgb[1], midtone.rgb[2], bright.rgb[0], bright.rgb[1], bright.rgb[2]);
+                break;
+            }
             case LottieEffect::DropShadow: {
                 auto effect = static_cast<LottieFxDropShadow*>(*ef);
                 auto color = effect->color(frameNo);

src/loaders/lottie/tvgLottieModel.h

@@ -79,34 +79,26 @@ struct LottieStroke
 
 struct LottieEffect
 {
-    enum Type : uint8_t
-    {
-        DropShadow = 0,
-        GaussianBlur,
-        Fill,
-        Tint
-    };
+    enum Type : uint8_t {Tint = 20, Fill, Tritone = 23, DropShadow = 25, GaussianBlur = 29};
 
     virtual ~LottieEffect() {}
-
     Type type;
     bool enable = false;
 };
 
-
 struct LottieFxFill : LottieEffect
 {
-    //LottieFloat fillMask?
+    //int16_t mask layer
     //LottieDropDown allMask?
     LottieColor color;
     //LottieDropDown inverted
     //LottieSlider horizontalFeather
     //LottieSlider verticalFeather
-    LottieSlider opacity = 0;
+    LottieSlider opacity;
 
     LottieFxFill()
     {
-        type = Fill;
+        type = LottieEffect::Fill;
     }
 };
 
@@ -118,7 +110,19 @@ struct LottieFxTint : LottieEffect
 
     LottieFxTint()
     {
-        type = Tint;
+        type = LottieEffect::Tint;
+    }
+};
+
+struct LottieFxTritone : LottieEffect
+{
+    LottieColor bright;
+    LottieColor midtone;
+    LottieColor dark;
+
+    LottieFxTritone()
+    {
+        type = LottieEffect::Tritone;
     }
 };
 
@@ -132,11 +136,10 @@ struct LottieFxDropShadow : LottieEffect
 
     LottieFxDropShadow()
     {
-        type = DropShadow;
+        type = LottieEffect::DropShadow;
     }
 };
 
-
 struct LottieFxGaussianBlur : LottieEffect
 {
     LottieSlider blurness = 0.0f;
@@ -145,7 +148,7 @@ struct LottieFxGaussianBlur : LottieEffect
 
     LottieFxGaussianBlur()
     {
-        type = GaussianBlur;
+        type = LottieEffect::GaussianBlur;
     }
 };
 

src/loaders/lottie/tvgLottieParser.cpp

@@ -60,10 +60,11 @@ static unsigned long _int2str(int num)
 LottieEffect* LottieParser::getEffect(int type)
 {
     switch (type) {
-        case 20: return new LottieFxTint;
-        case 21: return new LottieFxFill;
-        case 25: return new LottieFxDropShadow;
-        case 29: return new LottieFxGaussianBlur;
+        case LottieEffect::Tint: return new LottieFxTint;
+        case LottieEffect::Fill: return new LottieFxFill;
+        case LottieEffect::Tritone: return new LottieFxTritone;
+        case LottieEffect::DropShadow: return new LottieFxDropShadow;
+        case LottieEffect::GaussianBlur: return new LottieFxGaussianBlur;
         default: return nullptr;
     }
 }
@@ -1294,6 +1295,31 @@ void LottieParser::parseTint(LottieFxTint* effect)
 }
 
 
+void LottieParser::parseTritone(LottieFxTritone* effect)
+{
+    int idx = 0;  //bright, midtone, dark
+    enterArray();
+    while (nextArrayValue()) {
+        enterObject();
+        while (auto key = nextObjectKey()) {
+            if (KEY_AS("v")) {
+                enterObject();
+                while (auto key = nextObjectKey()) {
+                    if (KEY_AS("k")) {
+                        if (idx == 0) parsePropertyInternal(effect->bright);
+                        else if (idx == 1) parsePropertyInternal(effect->midtone);
+                        else if (idx == 2) parsePropertyInternal(effect->dark);
+                        else skip();
+                    } else skip();
+                }
+                ++idx;
+            } else skip();
+        }
+    }
+}
+
+
+
 void LottieParser::parseFill(LottieFxFill* effect)
 {
     int idx = 0;  //fill mask -> all mask -> color -> invert -> h feather -> v feather -> opacity
@@ -1378,14 +1404,18 @@ void LottieParser::parseEffect(LottieEffect* effect)
             parseFill(static_cast<LottieFxFill*>(effect));
             break;
         }
-        case LottieEffect::GaussianBlur: {
-            parseGaussianBlur(static_cast<LottieFxGaussianBlur*>(effect));
+        case LottieEffect::Tritone: {
+            parseTritone(static_cast<LottieFxTritone*>(effect));
             break;
         }
         case LottieEffect::DropShadow: {
             parseDropShadow(static_cast<LottieFxDropShadow*>(effect));
             break;
         }
+        case LottieEffect::GaussianBlur: {
+            parseGaussianBlur(static_cast<LottieFxGaussianBlur*>(effect));
+            break;
+        }
         default: break;
     }
 }

src/loaders/lottie/tvgLottieParser.h

@@ -98,6 +98,7 @@ private:
     LottieFont* parseFont();
     LottieMarker* parseMarker();
 
+    void parseTritone(LottieFxTritone* effect);
     void parseTint(LottieFxTint* effect);
     void parseFill(LottieFxFill* effect);
     void parseGaussianBlur(LottieFxGaussianBlur* effect);