Configuring save options for FileTypes retrieved from IFileTypesService

[null54]

I am working on converting my Optimized JPEG FileType to PDN 5.

 

I was hoping to be able to use the built-in JPEG FileType for saving, but I could not see any was to programmatically configure its quality setting.

 

[Rick Brewster]

There isn't really any publicly accessible way to use the built-in FileTypes for saving. I'm guessing you want to use the built-in JPEG FileType because it knows how to deal with WIC and all of its sharp corners.

 

I'm planning a big revamp of File Types stuff in PDN 6.0, but that's still quite a ways off. In the meantime I'm extremely hesitant to add pretty much anything to the FileType class, because part of the revamping will be replacing it with an interface-based API. 

 

However, instead of general purpose APIs (e.g. FileType), it might be reasonable to put in a special purpose interface for this sort of thing, e.g.

 

public interface IJpegService
{
    IJpegSaveOptions CreateSaveOptions();
  
    void Save(
      Stream output,
      IBitmapSource bitmap,
      IJpegSaveOptions options,      
      CancellationToken cancelToken);
}

public interface IJpegSaveOptions
{
    int Quality { get; set; }
    ...
    ... some properties for metadata, color context, etc.
}

 

This is doable now, and also provides an interface that is supportable after the FileTypes revamp, even if it does essentially get superceded by some kind of general purpose API.

[null54]

4 minutes ago, Rick Brewster said:

I'm guessing you want to use the built-in JPEG FileType because it knows how to deal with WIC and all of its sharp corners.

 

That is correct. Mainly for the fact that it handles all of the metadata support, which would be a pain to re-implement using WIC.

I considered casting the token returned by CreateDefaultSaveConfigToken to PropertyBasedSaveConfigToken, but that is a bit of a hack.

 

19 minutes ago, Rick Brewster said:

However, instead of general purpose APIs (e.g. FileType), it might be reasonable to put in a special purpose interface for this sort of thing, e.g.

 

That would work.