WebP (libwebp)，版本 1.4.0

WebP 是一种新的图像格式，为网页上的图像提供无损和有损压缩。

如果找不到系统 libwebp，则在 qwebp 图像插件中使用。

源代码可在 qtimageformats/src/3rdparty/libwebp 中找到。

项目主页，上游版本：1.4.0

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