diff --git a/src/egegapi.cpp b/src/egegapi.cpp
index b0eb2a2..d64b65a 100644
--- a/src/egegapi.cpp
+++ b/src/egegapi.cpp
@@ -2388,9 +2388,14 @@ void ege_path_widen(ege_path* path, float lineWidth, const ege_transform_matrix*
         Gdiplus::GraphicsPath* graphicsPath = (Gdiplus::GraphicsPath*)path->data();
         if (graphicsPath != NULL) {
             const Gdiplus::Pen pen(Gdiplus::Color(), lineWidth);
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->Widen(&pen, mat, flatness);
-            delete mat;
+
+            if (matrix != NULL) {
+                Gdiplus::Matrix mat;
+                matrixConvert(matrix, mat);
+                graphicsPath->Widen(&pen, &mat, flatness);
+            } else {
+                graphicsPath->Widen(&pen, NULL, flatness);
+            }
         }
     }
 }
@@ -2406,9 +2411,13 @@ void ege_path_flatten(ege_path* path, const ege_transform_matrix* matrix, float
         Gdiplus::GraphicsPath* graphicsPath = (Gdiplus::GraphicsPath*)path->data();
 
         if (graphicsPath != NULL) {
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->Flatten(mat, flatness);
-            delete mat;
+            if (matrix != NULL) {
+                Gdiplus::Matrix mat;
+                matrixConvert(matrix, mat);
+                graphicsPath->Flatten(&mat, flatness);
+            } else {
+                graphicsPath->Flatten(NULL, flatness);
+            }
         }
     }
 }
@@ -2427,9 +2436,14 @@ void ege_path_warp(ege_path* path, const ege_point* points, int count, const ege
         if (graphicsPath != NULL) {
             const Gdiplus::PointF* p = (const Gdiplus::PointF*)points;
             const Gdiplus::RectF r(rect->x, rect->y, rect->w, rect->h);
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->Warp(p, count, r, mat, Gdiplus::WarpModePerspective, flatness);
-            delete mat;
+
+            if (matrix != NULL) {
+                Gdiplus::Matrix mat;
+                matrixConvert(matrix, mat);
+                graphicsPath->Warp(p, count, r, &mat, Gdiplus::WarpModePerspective, flatness);
+            } else {
+                graphicsPath->Warp(p, count, r, NULL, Gdiplus::WarpModePerspective, flatness);
+            }
         }
     }
 }
@@ -2444,9 +2458,13 @@ void ege_path_outline(ege_path* path, const ege_transform_matrix* matrix, float
     if (path != NULL) {
         Gdiplus::GraphicsPath* graphicsPath = (Gdiplus::GraphicsPath*)path->data();
         if (graphicsPath != NULL) {
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->Outline(mat, flatness);
-            delete mat;
+            if (matrix != NULL) {
+                Gdiplus::Matrix mat;
+                matrixConvert(matrix, mat);
+                graphicsPath->Outline(&mat, flatness);
+            } else {
+                graphicsPath->Outline(NULL, flatness);
+            }
         }
     }
 }
@@ -2532,9 +2550,13 @@ ege_rect ege_path_getbounds(const ege_path* path, const ege_transform_matrix* ma
     if (path != NULL) {
         const Gdiplus::GraphicsPath* graphicsPath = (const Gdiplus::GraphicsPath*)path->data();
         if (graphicsPath != NULL) {
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->GetBounds((Gdiplus::RectF*)&bounds, mat);
-            delete mat;
+            if (matrix != NULL) {
+                Gdiplus::Matrix mat;
+                matrixConvert(matrix, mat);
+                graphicsPath->GetBounds((Gdiplus::RectF*)&bounds, &mat);
+            } else {
+                graphicsPath->GetBounds((Gdiplus::RectF*)&bounds, NULL);
+            }
         }
     }
 
@@ -2548,9 +2570,13 @@ ege_rect ege_path_getbounds(const ege_path* path, const ege_transform_matrix* ma
         const Gdiplus::GraphicsPath* graphicsPath = (const Gdiplus::GraphicsPath*)path->data();
         if (graphicsPath != NULL) {
             PIMAGE img = CONVERT_IMAGE_CONST((PIMAGE)pimg);
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->GetBounds((Gdiplus::RectF*)&bounds, mat, img->getPen());
-            delete mat;
+            if (matrix != NULL) {
+                Gdiplus::Matrix mat;
+                matrixConvert(matrix, mat);
+                graphicsPath->GetBounds((Gdiplus::RectF*)&bounds, &mat, img->getPen());
+            } else {
+                graphicsPath->GetBounds((Gdiplus::RectF*)&bounds, NULL, img->getPen());
+            }
             CONVERT_IMAGE_END
         }
     }
@@ -2606,9 +2632,9 @@ void ege_path_transform(ege_path* path, const ege_transform_matrix *matrix)
     if ((path != NULL) && (matrix != NULL)) {
         Gdiplus::GraphicsPath* graphicsPath = (Gdiplus::GraphicsPath*)path->data();
         if (graphicsPath != NULL) {
-            const Gdiplus::Matrix* mat = matrixConvert(matrix);
-            graphicsPath->Transform(mat);
-            delete mat;
+            Gdiplus::Matrix mat;
+            matrixConvert(matrix, mat);
+            graphicsPath->Transform(&mat);
         }
     }
 }
@@ -2863,7 +2889,8 @@ void EGEAPI ege_set_transform(const ege_transform_matrix* matrix, PIMAGE pimg)
     PIMAGE img = CONVERT_IMAGE(pimg);
     if (img && matrix) {
         Gdiplus::Graphics* graphics = img->getGraphics();
-        const Gdiplus::Matrix mat(matrix->m11, matrix->m12, matrix->m21, matrix->m22, matrix->m31, matrix->m32);
+        Gdiplus::Matrix mat;
+        matrixConvert(matrix, mat);
         graphics->SetTransform(&mat);
     }
     CONVERT_IMAGE_END;
diff --git a/src/gdi_conv.cpp b/src/gdi_conv.cpp
index d160f9e..7754c1b 100644
--- a/src/gdi_conv.cpp
+++ b/src/gdi_conv.cpp
@@ -5,20 +5,18 @@ namespace ege
 {
 
 /**
- * 将ege_transform_matrix 转换为 Gdiplus::Matrix
- * matrix 参数不为 NULL 时返回 Matrix 对象指针，否则返回 NULL
+ * 将 ege_transform_matrix 类型转换为 Gdiplus::Matrix 类型
+ * @param[in]  from  输入的矩阵
+ * @param[out] to    保存转换结果
+ * @note 如果 from 参数为 NULL，输出结果为单位矩阵。
  */
-Gdiplus::Matrix* matrixConvert(const ege_transform_matrix* matrix)
+void matrixConvert(const ege_transform_matrix* from, Gdiplus::Matrix& to)
 {
-    if (matrix != NULL) {
-        return new Gdiplus::Matrix(
-            matrix->m11, matrix->m12,
-            matrix->m21, matrix->m22,
-            matrix->m31, matrix->m32
-        );
+    if (from) {
+        to.SetElements(from->m11, from->m12, from->m21, from->m22, from->m31, from->m32);
+    } else {
+        to.Reset();
     }
-
-    return NULL;
 }
 
 }
diff --git a/src/gdi_conv.h b/src/gdi_conv.h
index dbbe7ce..182d3eb 100644
--- a/src/gdi_conv.h
+++ b/src/gdi_conv.h
@@ -4,6 +4,6 @@
 
 namespace ege
 {
-    /* 矩阵类型转换*/
-    Gdiplus::Matrix* matrixConvert(const ege_transform_matrix* matrix);
+    /* 矩阵类型转换 */
+    void matrixConvert(const ege_transform_matrix* from, Gdiplus::Matrix& to);
 }