Introduce independent hstride and vstride, and use them.
am: bb7b551f97

* commit 'bb7b551f976e85040c4ddfb92100830c8c36d479':
  Introduce independent hstride and vstride, and use them.

Change-Id: Ibb3ab85b0856e2469b79e287ced0b667d8e13561