Sprite Blending Revisited

[jusforfun]

Hi all,
In continuation to #138 , After #138 was resolved, in my recent usage of the plugin, have discovered additional issue regarding the sprite blend;

-Opacity Animation Which due to the removal the blend func; it reads as src blend as one which will give off the slight Additive Blend feel during the animation instead of normal fade-in/out,

//Opacity Animation test(0 ~ 255 alpha) Before Modification

Additive Blend Mode Issue , Which resulted in a slightly duller colour;

//Additive Blend Mode test Before Modification

So i have tried to troubleshoot and have did a slight modification of creatorReader to resolve the issue of my above mentioned use case,
It may not be the best or good way;
But i would at least like to highlight possible issue that the community would encounter since i have encounter it myself;

Below is the modified Snippet of the CreatorReader.cpp

 void CreatorReader::parseSprite(cocos2d::Sprite* sprite, const buffers::Sprite* spriteBuffer) const
{

    /* As Per before*/

    // Creator doesn't premultiply alpha, so its blend function can not work in cocos2d-x.
    // const auto& srcBlend = spriteBuffer->srcBlend();
    // const auto& dstBlend = spriteBuffer->dstBlend();
    // cocos2d::BlendFunc blendFunc;
    // blendFunc.src = srcBlend;
    // blendFunc.dst = dstBlend;
    // sprite->setBlendFunc(blendFunc);

    const auto& srcBlend = spriteBuffer->srcBlend();
    const auto& dstBlend = spriteBuffer->dstBlend();

    //MODIFICATION START - If the blend function declared in creator is additive; 
    //Without setting the blend function, the color would get dull;
    if (srcBlend == GL_SRC_ALPHA && dstBlend == GL_ONE)
    {
	    cocos2d::BlendFunc blendFunc;
	    blendFunc.src = srcBlend;
	    blendFunc.dst = dstBlend;
	    sprite->setBlendFunc(blendFunc);
    } 
    //For Animation that plays around with opacity
    const AnimationRef *animRef = nodeBuffer->anim();
    if (animRef) 
    {
        const auto& animationClips = animRef->clips();
        for (const auto& fbAnimationClip : *animationClips)
        {
	        const auto& curveDatas = fbAnimationClip->curveData();
	        for (const auto& fbCurveData : *curveDatas) 
	        {
		        if (fbCurveData) 
		        {
				const AnimProps* fbAnimProps = fbCurveData->props();
				//Retrieve opacity curveData
				const auto& opacityValue = fbAnimProps->opacity();

				//If there is an opacity data, set the blend mode as per creator;
				//As without setting blend from creator, 
				//the Blend func read would be src = GL_ONE; dst = GL_ONE_MINUS_ALPHA
				//It will give off an additive effect instead of normal opacity animation;
				if (opacityValue->size() != 0)
				{
				    cocos2d::BlendFunc blendFunc;
				    blendFunc.src = srcBlend;
				    blendFunc.dst = dstBlend;
				    sprite->setBlendFunc(blendFunc);
				}
		        }
	        }
        }
    }
     //MODIFICATION END 
    /* As Per before*/
}

End result of the modification

//OpacityAnimation (0 ~ 255 alpha)

//Additive Blend