From d345feed67b425495dc3b757785a346797da7267 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 28 Apr 2021 17:21:06 +0800
Subject: *Image\RawImage

---
 Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Graphic.cs  |  1 +
 Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs    | 10 ++++++++--
 Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/RawImage.cs |  3 +--
 3 files changed, 10 insertions(+), 4 deletions(-)

(limited to 'Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics')

diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Graphic.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Graphic.cs
index e0d70f3..845bfc4 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Graphic.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Graphic.cs
@@ -532,6 +532,7 @@ namespace UnityEngine.UI
                     if (canvas != null && canvas.overrideSorting)
                         continueTraversal = false;
 
+                    // 如果实现了这个接口再进一步判断一下
                     var filter = components[i] as ICanvasRaycastFilter;
 
                     if (filter == null)
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs
index 4844c19..65e0cfd 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Image.cs
@@ -202,8 +202,12 @@ namespace UnityEngine.UI
             }
         }
 
-        public virtual void OnBeforeSerialize() {}
+        public virtual void OnBeforeSerialize()
+        {
+            //Debug.Log("OnBeforeSerialize");
+        }
 
+        // 序列化之后，即修改了序列化参数之后。校正一下结果
         public virtual void OnAfterDeserialize()
         {
             if (m_FillOrigin < 0)
@@ -321,11 +325,12 @@ namespace UnityEngine.UI
                 return;
             }
 
+            //如果是ETC压缩格式，会生成一份alphaTex只保存透明度信息，不在_MainTex里
             Texture2D alphaTex = activeSprite.associatedAlphaSplitTexture;
 
             if (alphaTex != null)
             {
-                canvasRenderer.SetAlphaTexture(alphaTex);
+                canvasRenderer.SetAlphaTexture(alphaTex); // _AlphaTex
             }
         }
 
@@ -1082,6 +1087,7 @@ namespace UnityEngine.UI
 
         public virtual int layoutPriority { get { return 0; } }
 
+        //会根据透明度做更细致的射线检测，透明的地方不算
         public virtual bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
         {
             if (alphaHitTestMinimumThreshold <= 0)
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/RawImage.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/RawImage.cs
index 35f0508..e6dab1b 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/RawImage.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/RawImage.cs
@@ -29,14 +29,13 @@ namespace UnityEngine.UI
             get
             {
                 if (m_Texture == null)
-                {
+                {
                     if (material != null && material.mainTexture != null)
                     {
                         return material.mainTexture;
                     }
                     return s_WhiteTexture;
                 }
-
                 return m_Texture;
             }
         }
-- 
cgit v1.1-26-g67d0