blending function for Scale9Sprite

cocos/ui/UIScale9Sprite.cpp

@@ -158,6 +158,56 @@ namespace ui {
         auto sprite = Sprite::createWithTexture(batchnode->getTexture());
         return init(sprite, rect, false, capInsets);
     }
+        
+    void Scale9Sprite::setBlendFunc(const BlendFunc &blendFunc)
+    {
+        _blendFunc = blendFunc;
+        applyBlendFunc();
+    }
+    const BlendFunc &Scale9Sprite::getBlendFunc() const
+    {
+        return _blendFunc;
+    }
+    
+    void Scale9Sprite::updateBlendFunc(Texture2D *texture)
+    {
+        
+        // it is possible to have an untextured sprite
+        if (! texture || ! texture->hasPremultipliedAlpha())
+        {
+            _blendFunc = BlendFunc::ALPHA_NON_PREMULTIPLIED;
+            setOpacityModifyRGB(false);
+        }
+        else
+        {
+            _blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;
+            setOpacityModifyRGB(true);
+        }
+    }
+    
+    void Scale9Sprite::applyBlendFunc()
+    {
+        if(_scale9Image)
+            _scale9Image->setBlendFunc(_blendFunc);
+        if(_topLeftSprite)
+            _topLeftSprite->setBlendFunc(_blendFunc);
+        if(_topSprite)
+            _topSprite->setBlendFunc(_blendFunc);
+        if(_topRightSprite)
+            _topRightSprite->setBlendFunc(_blendFunc);
+        if(_leftSprite)
+            _leftSprite->setBlendFunc(_blendFunc);
+        if(_centerSprite)
+            _centerSprite->setBlendFunc(_blendFunc);
+        if(_rightSprite)
+            _rightSprite->setBlendFunc(_blendFunc);
+        if(_bottomLeftSprite)
+            _bottomLeftSprite->setBlendFunc(_blendFunc);
+        if(_bottomSprite)
+            _bottomSprite->setBlendFunc(_blendFunc);
+        if(_bottomRightSprite)
+            _bottomRightSprite->setBlendFunc(_blendFunc);
+    }
 
     bool Scale9Sprite::updateWithBatchNode(cocos2d::SpriteBatchNode *batchnode, const cocos2d::Rect &originalRect, bool rotated, const cocos2d::Rect &capInsets)
     {
@@ -193,6 +243,8 @@ namespace ui {
         this->cleanupSlicedSprites();
         _protectedChildren.clear();
         
+        updateBlendFunc(sprite?sprite->getTexture():nullptr);
+
         if(nullptr != sprite)
         {
             if (nullptr == sprite->getSpriteFrame())
@@ -255,6 +307,8 @@ namespace ui {
             this->createSlicedSprites();
         }
         
+        applyBlendFunc();
+        
         this->setContentSize(size);
         
         if (_spritesGenerated)

cocos/ui/UIScale9Sprite.h

@@ -45,7 +45,7 @@ namespace ui {
      *         Then you could call any methods of Sprite class with the return pointers.
      *
      */
-    class CC_GUI_DLL Scale9Sprite : public Node
+    class CC_GUI_DLL Scale9Sprite : public Node, public cocos2d::BlendProtocol
     {
     public:
         /**
@@ -243,6 +243,25 @@ namespace ui {
         virtual bool init(Sprite* sprite, const Rect& rect, bool rotated, const Vec2 &offset, const Size &originalSize, const Rect& capInsets);
         CC_DEPRECATED_ATTRIBUTE virtual bool initWithBatchNode(SpriteBatchNode* batchnode, const Rect& rect, bool rotated, const Rect& capInsets);
         CC_DEPRECATED_ATTRIBUTE virtual bool initWithBatchNode(SpriteBatchNode* batchnode, const Rect& rect, const Rect& capInsets);
+        
+        /**
+         * Sets the source blending function.
+         *
+         * @param blendFunc A structure with source and destination factor to specify pixel arithmetic,
+         *                  e.g. {GL_ONE, GL_ONE}, {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA}.
+         * @js NA
+         * @lua NA
+         */
+        virtual void setBlendFunc(const BlendFunc &blendFunc) override;
+        
+        /**
+         * Returns the blending function that is currently being used.
+         *
+         * @return A BlendFunc structure with source and destination factor which specified pixel arithmetic.
+         * @js NA
+         * @lua NA
+         */
+        virtual const BlendFunc &getBlendFunc() const override;
 
         /**
          * Creates and returns a new sprite object with the specified cap insets.
@@ -383,6 +402,8 @@ namespace ui {
         void createSlicedSprites();
         void cleanupSlicedSprites();
         void adjustScale9ImagePosition();
+        void applyBlendFunc();
+        void updateBlendFunc(Texture2D *texture);
         /**
          * Sorts the children array once before drawing, instead of every time when a child is added or reordered.
          * This approach can improves the performance massively.
@@ -408,6 +429,7 @@ namespace ui {
         Sprite* _bottomRightSprite;
         
         bool _scale9Enabled;
+        BlendFunc _blendFunc;
         
         Size _topLeftSize;
         Size _centerSize;