ImageDecoderImpeller currently attempts to decode images using whatever target size is requested by the framework, but often times codecs (for example, the PNG SkCodec) can't decode into buffers of arbitrary sizes relative to the original image size. So in this situation, the codec rejects the attempt at decoding.

ImageDecoderSkia handles this situation by asking the codec to render at the closest resolution supported by the codec, and then proceeds to scale down the decoded image further if necessary: https://github.com/flutter/engine/blob/af2edb6e987f00d408e392f4f68535e7e17d2d8a/lib/ui/painting/image_decoder_skia.cc#L111-L157