shithub: libvpx

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Avoid scaling last_source, unless needed.

Save some encoding time, for the case of spatial layers
or under dynamic resizing mode.

Change-Id: If4a8eb6f0376c3d2dde8465fde6bfd86ab704920

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

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

@@ -3201,7 +3201,13 @@

   cpi->Source = vp9_scale_if_required(cm,

                                       cpi->un_scaled_source,

                                       &cpi->scaled_source);

-  if (cpi->unscaled_last_source != NULL)

+

+  // Avoid scaling last_source unless its needed.

+  // Last source is currently only used for screen-content mode,

+  // or if partition_search_type == SOURCE_VAR_BASED_PARTITION.

+  if (cpi->unscaled_last_source != NULL &&

+      (cpi->oxcf.content == VP9E_CONTENT_SCREEN ||

+      cpi->sf.partition_search_type == SOURCE_VAR_BASED_PARTITION))

     cpi->Last_Source = vp9_scale_if_required(cm,

                                              cpi->unscaled_last_source,

                                              &cpi->scaled_last_source);