TMP字体渲染修正，使用字体资源获取字库纹理的尺寸，避免通过程序创建的资源取到字体纹理尺寸为0导致阴影效果渲染有误的问题。

Author: Geequlim

Assets/Scripts/Extensions/TextMeshPro/TMPFont.cs

@@ -99,8 +99,8 @@ void Init()
 
         void OnCreateNewMaterial(Material mat)
         {
-            mat.SetFloat(ShaderUtilities.ID_TextureWidth, mainTexture.width);
-            mat.SetFloat(ShaderUtilities.ID_TextureHeight, mainTexture.height);
+            mat.SetFloat(ShaderUtilities.ID_TextureWidth, fontAsset.atlasWidth);
+            mat.SetFloat(ShaderUtilities.ID_TextureHeight, fontAsset.atlasHeight);
             mat.SetFloat(ShaderUtilities.ID_GradientScale, _gradientScale);
             mat.SetFloat(ShaderUtilities.ID_WeightNormal, fontAsset.normalStyle);
             mat.SetFloat(ShaderUtilities.ID_WeightBold, fontAsset.boldStyle);

Assets/Scripts/Utils/Html/HtmlPageContext.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using TMPro;
 using UnityEngine;
 
 namespace FairyGUI.Utils