From 1e7cf2f5f9eb54a6b162473c3cbe066d50db19fc Mon Sep 17 00:00:00 2001
From: Jinny You <jinny@lottiefiles.com>
Date: Thu, 9 May 2024 14:06:15 +0900
Subject: [PATCH] lottie/text: Support text tracking

Text Tracking value("tr") is parsed and never used.

Calculate text spacing size via the tracking offset.

Issue: #2254
---
 src/loaders/lottie/tvgLottieBuilder.cpp | 2 +-
 src/loaders/lottie/tvgLottieParser.cpp  | 2 +-
 src/loaders/lottie/tvgLottieProperty.h  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/loaders/lottie/tvgLottieBuilder.cpp b/src/loaders/lottie/tvgLottieBuilder.cpp
index b76020fa..32d40a2b 100644
--- a/src/loaders/lottie/tvgLottieBuilder.cpp
+++ b/src/loaders/lottie/tvgLottieBuilder.cpp
@@ -606,7 +606,7 @@ static void _updateText(LottieGroup* parent, LottieObject** child, float frameNo
                 p += glyph->len; 
 
                 //advance the cursor position horizontally
-                cursor.x += glyph->width + spacing;
+                cursor.x += glyph->width + spacing + doc.tracking;
                 break;
             }
         }
diff --git a/src/loaders/lottie/tvgLottieParser.cpp b/src/loaders/lottie/tvgLottieParser.cpp
index 782e0030..7a102783 100644
--- a/src/loaders/lottie/tvgLottieParser.cpp
+++ b/src/loaders/lottie/tvgLottieParser.cpp
@@ -183,7 +183,7 @@ void LottieParser::getValue(TextDocument& doc)
         else if (KEY_AS("f")) doc.name = getStringCopy();
         else if (KEY_AS("t")) doc.text = getStringCopy();
         else if (KEY_AS("j")) doc.justify = getInt();
-        else if (KEY_AS("tr")) doc.tracking = getInt();
+        else if (KEY_AS("tr")) doc.tracking = getFloat() * 0.1f;
         else if (KEY_AS("lh")) doc.height = getFloat();
         else if (KEY_AS("ls")) doc.shift = getFloat();
         else if (KEY_AS("fc")) getValue(doc.color);
diff --git a/src/loaders/lottie/tvgLottieProperty.h b/src/loaders/lottie/tvgLottieProperty.h
index 85720c8a..26a495eb 100644
--- a/src/loaders/lottie/tvgLottieProperty.h
+++ b/src/loaders/lottie/tvgLottieProperty.h
@@ -75,8 +75,8 @@ struct TextDocument
     } stroke;
     char* name = nullptr;
     float size;
+    float tracking;
     uint8_t justify;
-    uint8_t tracking;
 };