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;

}