XAP file from XNA game is huge, how can I compile

问题:

I typically have been writing xna games for windows phone 7 and set all my content to a build action of compile, which is default; what I've noticed is that my XAP file is now huge after finishing a new project, it seems to have taken 15MB worth of images and blown them up to 200MB in size. Is there anyway to get the build to be smaller while keeping the images compiled? From what I read it compiles images as basically full bitmaps. What's another direction I can take to resolve this issue, as forcing users to download a 200MB app seems unfair when at most it should only take up 15-20MB.

回答1:

The XNA Content Pipeline basically stores images as they will be used on the GPU. That is either as an uncompressed bitmap, or DXT compressed (which doesn't compress it by much).

So if your original files were in jpeg format (or, to a lesser extent, png), you will find that your original files are much smaller than the built XNB files.

So the answer is to distribute your original jpeg and png files, and load them with Texture2D.FromStream. Note that this uses more CPU power to convert them into the right format at runtime (although I've heard reports of faster loading in some cases, because there's less data being transferred). Also you'll have to do premultiplied alpha manually yourself (and anything else that the content pipeline is handling for you).

Another thing you might want to look into is turning on compression for your sound effects. By default they are uncompressed. See this answer for details.

For more info, this article looks helpful.