shithub: libvpx

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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