ref: 6594ca8897ea0293d44b825f7c7fe81a7eb540a4
parent: 2ae93a776b4b5ba864363a7de36f3e4b6aa99eab
author: Jingning Han <jingning@google.com>
date: Tue Oct 8 05:06:08 EDT 2013
All zero coeff skip in IDCT 32x32 When all coefficients are zeros, skip the corresponding 1-D inverse transform. This practice has been used in the SSE2 implementation of inverse 32x32 DCT. This commit imports this algorithm into the C code. Change-Id: I0f58bfcb183a569fab85d524d5d9cf8ae8653f86