我应该在GAE中使用哪些类进行基本位图操作？

Question

I have to get some code running on the GAE and it does some very basic bitmap manipulation. What I fundamentally need to do is:

1. Convert a bitmap from one format to another (usually to PNG).
2. Get the metadata of an image: size in pixels, DPI, & bitmap format.
3. Resize an image.
4. Walk the pixels in a bitmap to read and/or set them (this can be slow - rarely used).

Also, it would be terrific if there's a class that will convert metafiles to a bitmap?

thanks - dave

Answer 1

For basic image manipulation (resize, crop, rotate etc.), you can use the Images API and in particular, the interface com.google.appengine.api.images.Image .

The API seems to support many of the requirements that you mention.