精灵变灰

// 精灵变灰
Sprite * CUserData ::MakeSpiteGray( * ChangeSprite)
{
Sprite * sprite_chess = :: createWithSpriteFrame (ChangeSprite-> getSpriteFrame ());
sprite_chess-> setPosition (sprite_chess-> getContentSize (). width /2,sprite_chess-> height /2);

RenderTexture *render = create (sprite_chess-> getContentSize (). width ,sprite_chess-> height Texture2D PixelFormat RGBA8888 );
render-> beginWithClear (0.0f,0.0f,0.0f);
visit ();
end Director getInstance ()-> getRenderer render Image *finalImage = render-> newImage unsigned char *pData = finalImage-> getData int iIndex = 0;
for ( i = 0; i < finalImage-> getHeight (); i ++)
{
j = 0; j < finalImage-> getWidth (); j ++)
{
// gray
iBPos = iIndex;
iB = pData[iIndex];
iIndex ++;
iG = pData[iIndex];
iR = pData[iIndex];
iGray = 0.3 * iR + 0.6 * iG + 0.1 * iB;
pData[iBPos] = pData[iBPos + 1] = pData[iBPos + 2] = ( )iGray;
}
}
Texture2D *texture = new ;
texture-> initWithImage (finalImage);
auto pSprite = :: createWithTexture (texture);
delete finalImage;
release return pSprite;
}

http://www.cocoachina.com/bbs/read.PHP?tid=219268

我这里用的是 createWithSpriteFrame，主要是为了从已加载的 texturepacker打包的plist中 获取的精灵，所以用了RenderTexture绘制。。。
如果是用的散图，就简单多了，直接new Image；在调用initwithfile("xx.png")，然后getData()，后面代码一样了；