精灵变灰

最新推荐文章于 2023-11-07 02:02:53 发布

转载最新推荐文章于 2023-11-07 02:02:53 发布 · 537 阅读

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本文介绍了一种使用 C++ 和 Cocos2d-x 框架将彩色精灵图像转换为灰度图像的方法。通过创建 RenderTexture 来渲染精灵，并对像素颜色进行灰度处理，最终实现了灰度效果。

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

RenderTexture *render = RenderTexture::create(sprite_chess->getContentSize().width, sprite_chess->getContentSize().height,Texture2D::PixelFormat::RGBA8888);
render->beginWithClear(0.0f, 0.0f, 0.0f, 0.0f);
sprite_chess->visit();
render->end();
Director::getInstance()->getRenderer()->render();

  Image *finalImage = render->newImage();

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

  int iIndex = 0;

  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 ++;
iIndex ++;

  unsigned int iGray = 0.3 * iR + 0.6 * iG + 0.1 * iB;

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

}

  Texture2D *texture = new Texture2D;

texture->initWithImage(finalImage);

  auto pSprite = Sprite::createWithTexture(texture);

  delete finalImage;

texture->release();

  return pSprite;

}

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

我这里用的是 Sprite::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；