From 46aa29781a35decadb32de0820dc553698bbc47a Mon Sep 17 00:00:00 2001
From: Hermet Park <hermet@lottiefiles.com>
Date: Tue, 4 Jul 2023 01:13:42 +0900
Subject: [PATCH] common math: enhance matrix functions.

Accumulating matrix value factors would have broader usage.
---
 src/lib/tvgMath.h     | 10 +++++-----
 src/lib/tvgRender.cpp |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/lib/tvgMath.h b/src/lib/tvgMath.h
index 9ab8291b..c5613e08 100644
--- a/src/lib/tvgMath.h
+++ b/src/lib/tvgMath.h
@@ -109,17 +109,17 @@ static inline void mathIdentity(Matrix* m)
 }
 
 
-static inline void mathScale(Matrix* m, float scale)
+static inline void mathScale(Matrix* m, float sx, float sy)
 {
-    m->e11 = scale;
-    m->e22 = scale;
+    m->e11 *= sx;
+    m->e22 *= sy;
 }
 
 
 static inline void mathTranslate(Matrix* m, float x, float y)
 {
-    m->e13 = x;
-    m->e23 = y;
+    m->e13 += x;
+    m->e23 += y;
 }
 
 
diff --git a/src/lib/tvgRender.cpp b/src/lib/tvgRender.cpp
index fb9270af..ec4db13f 100644
--- a/src/lib/tvgRender.cpp
+++ b/src/lib/tvgRender.cpp
@@ -53,7 +53,7 @@ bool RenderTransform::update()
 
     mathIdentity(&m);
 
-    mathScale(&m, scale);
+    mathScale(&m, scale, scale);
 
     if (!mathZero(degree)) mathRotate(&m, degree);