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vp9: Reset params for cyclic refresh on slide change

Reset the last_coded_q_map and the sb->index in the cyclic_refresh
on a re-encode for slide change, so the refresh can start again
right after slide change.

Change-Id: I10cbc8354de8f7c2863b4212e6793b58a048b330

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -593,7 +593,8 @@

   const VP9_COMMON *const cm = &cpi->common;

   CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;

   memset(cr->map, 0, cm->mi_rows * cm->mi_cols);

-  memset(cr->last_coded_q_map, MAXQ, cm->mi_rows * cm->mi_cols);

+  memset(cr->last_coded_q_map, MAXQ,

+         cm->mi_rows * cm->mi_cols * sizeof(*cr->last_coded_q_map));

   cr->sb_index = 0;

   cpi->refresh_golden_frame = 1;

   cpi->refresh_alt_ref_frame = 1;

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -3880,8 +3880,12 @@

       suppress_active_map(cpi);

       // Turn-off cyclic refresh for re-encoded frame.

       if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) {

+        CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;

         unsigned char *const seg_map = cpi->segmentation_map;

         memset(seg_map, 0, cm->mi_rows * cm->mi_cols);

+        memset(cr->last_coded_q_map, MAXQ,

+               cm->mi_rows * cm->mi_cols * sizeof(*cr->last_coded_q_map));

+        cr->sb_index = 0;

         vp9_disable_segmentation(&cm->seg);

       }

       apply_active_map(cpi);