cocos2d-x图片变灰或者变亮

//根据现有CCSprite，变亮和变灰

CCSprite*
FlyLeaf::graylightWithCCSprite(CCSprite* oldSprite,bool isLight)

{

    //CCSprite转成CCimage

    CCPoint
p = oldSprite->getAnchorPoint();

    oldSprite->setAnchorPoint(ccp(0,0));

    CCRenderTexture
*outTexture = CCRenderTexture::create((int)oldSprite->getContentSize().width,(int)oldSprite->getContentSize().height);

    outTexture->begin();

    oldSprite->visit();

    outTexture->end();

    oldSprite->setAnchorPoint(p);

 

    CCImage*
finalImage = outTexture->newCCImage();

    unsigned char *pData
= finalImage->getData();

    int iIndex
= 0;

 

    if(isLight)

    {

        for (int i
= 0; i < finalImage->getHeight(); i ++)

        {

            for (int j
= 0; j < finalImage->getWidth(); j ++)

            {

                //
highlight

                int iHightlightPlus
= 50;

                int iBPos
= iIndex;

                unsigned int iB
= pData[iIndex];

                iIndex
++;

                unsigned int iG
= pData[iIndex];

                iIndex
++;

                unsigned int iR
= pData[iIndex];

                iIndex
++;

                //unsigned
int o = pData[iIndex];

                iIndex
++;  //原来的示例缺少

                iB
= (iB + iHightlightPlus > 255 ? 255 : iB + iHightlightPlus);

                iG
= (iG + iHightlightPlus > 255 ? 255 : iG + iHightlightPlus);

                iR
= (iR + iHightlightPlus > 255 ? 255 : iR + iHightlightPlus);

                pData[iBPos]
= (unsigned char)iB;

                pData[iBPos
+ 1] = (unsigned char)iG;

                pData[iBPos
+ 2] = (unsigned char)iR;

            }

        }

    }else{

        for (int i
= 0; i < finalImage->getHeight(); i ++)

        {

            for (int j
= 0; j < finalImage->getWidth(); j ++)

            {

                //
gray

                int iBPos
= iIndex;

                unsigned int iB
= pData[iIndex];

                iIndex
++;

                unsigned int iG
= pData[iIndex];

                iIndex
++;

                unsigned int iR
= pData[iIndex];

                iIndex
++;

                //unsigned
int o = pData[iIndex];

                iIndex
++; //原来的示例缺少

                unsigned int iGray
= 0.299 * iR + 0.587 * iG + 0.114 * iB;

                pData[iBPos]
= pData[iBPos + 1] = pData[iBPos + 2] = (unsigned char)iGray;

            }

        }

    }

 

    CCTexture2D
*texture = new CCTexture2D;

    texture->initWithImage(finalImage);

    CCSprite*
newSprite = CCSprite::createWithTexture(texture);

    delete finalImage;

    texture->release();

    return newSprite;

}