cocos2d/cocos2d-x — pull request #1801 by dualface (2012-12-29 02:44:40+00:00)
Title: add WebP support

> WebP is a new image format that provides lossless and lossy compression for images on the web. WebP lossless images are 28% smaller in size compared to PNGs. WebP lossy images are 25-34% smaller in size compared to JPEG images at equivalent SSIM index. WebP supports lossless transparency (also known as alpha channel) with just 22% additional bytes. WebP also supports features such as animation, ICC color profile, XMP meta-data and tiling.

> https://developers.google.com/speed/standards/

HOW TO USE:

```
CCSprite *sprite = CCSprite::create("hello.webp");
CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("sheet.plist", "sheet.webp");
```