tree 16f678950a0309853cfb3f9240a80a6ef5a45a40
parent 238cdcdbe195fcf7bad0a4fa56e9da2e98bae505
author Pascal Massimino <pascal.massimino@gmail.com> 1459863056 +0200
committer Pascal Massimino <pascal.massimino@gmail.com> 1459924010 -0700

lossless decoding: only process decoded row up to last_row

there's some subtle changes:
  - DecodeAlphaData() may be called with pos==end because we don't want
    to decode more data (there's none left), but because we want to apply
    process_func() to all the unprocessed pixels already decoded
  - last_row is exclusive and should be understood as 'up to last_row'. Can be misleading.
  - VP8LDecodeAlphaImageStream() was testing dec->last_pixel_ for completion,
    which was wrong because last_pixel_ is the last *decoded* pixel, not the
    last *processed* one. -> test now uses last_row_, as expected

Change-Id: I1fb04ba25cd7a4775db9e3deee3e2ae80f9c0a75