[Feature request] Return the image type

[bramp]

Platforms

dart

Description

In addition to returning a size, it would be useful to return the image type (PNG, JPG, etc).

The implementation of ImageSizeGetter.getSize seems to cycle though each image format, to check if it's a valid image, and then return the size for the first valid one. It would be useful to also return the image type, so this can be used by the caller.

Why

To validate the image is the expected file format, or to just determine the file format.

[CaiJingLong]

Sorry for the long time no reply.
The problem is, images come in many formats, and the library provides custom decoders, so I can't predict all types.
In this case, I can't use enumerations to define all image types, and using string I can't enjoy strong typing when using.

[bramp]

To clarify, the change is just to return the name of the file type when returning a valid size.

So changing https://github.com/CaiJingLong/dart_image_size_getter/blob/ef9d71e301c002d0a20bf622a176828db2e82f2f/packages/image_size_getter/lib/src/image_size_getter.dart#L120 to return value.decoderName in addition to the result of getSize.