Remove the duplicated process to force decode (draw on bitmap context) in Image/IO's progressive decoding.
Remove the duplicated process to force decode (draw on bitmap context) in Image/IO's progressive decoding.

This is the bug in early version of Image/IO framework, but now it's already been fixed and duplicated process impact performance

dreampiggy/SDWebImage,rs/SDWebImage,dreampiggy/SDWebImage,zhang-yawei/SDWebImage,dreampiggy/SDWebImage,tualatrix/SDWebImage,awkward/SDWebImage,awkward/SDWebImage,awkward/SDWebImage