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fix useless copies of TempCtx objects to Ctx dest

charles Salmon-Legagneur requested to merge salmonc/ECM:fix_tempctx_recopies into master

This commit suppresses 12 useless copies of TempCtx to Ctx instances and is bit accurate.

Instructions of the form m_CABACEstimator->getCtx() = ctxStart trigs a copy of TempCtx to Ctx, which copies full contexts from src to dest. The usual way is to recopy only sub contextes : m_CABACEstimator->getCtx() = SubCtx(Ctx::CcSaoControlIdc,ctxStart);

Whenever the TempCtx is initialized with a subCtx, only initialized sub contextes should be copied and not the full range. This optimization takes place for code in :

  • SAO
  • ALF
  • CabacWriter.cpp

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