将图片更改为纯色

changeColor.cpp

    CCImage* img = new CCImage();
    img->initWithImageFile("A4.png");
    
    unsigned char* data = new unsigned char[img->getDataLen()*4];
    CCLOG("data len %d", img->getDataLen());
    
    data = img->getData();
    
    for(int i = 0; i < img->getWidth(); i++)
    {
        for(int j = 0; j < img->getHeight(); j++)
        {
            unsigned char* pixel = data + (i + j * img->getWidth()) * 4;
            
//            unsigned char r = *pixel;
//            unsigned char g = *(pixel + 1);
//            unsigned char b = *(pixel + 2);
            if (*(pixel + 3) != 0) {
                *pixel = 255;
                *(pixel + 1) = 0;
                *(pixel + 2) = 0;
            }
        }
    }
    
    CCTexture2D * texture = new CCTexture2D();
    texture->initWithImage(img);
    
    CCSprite* spr = CCSprite::createWithTexture(texture);
    this->addChild(spr, 100);
    spr->setPosition(ccp(240, 160));