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Properly handle the boundary blocks for integral projection search

Use rectangular block size for integral projection motion estimation
if the the 64x64 block has over half block outside the frame. This
avoids the issue that the motion information of these blocks is
dominated by the extended pixels, instead of the pixels of interest.

Change-Id: I22f4d2bb7f6a20db9b3f5e2e5463a7f4b9d1b737

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -715,6 +715,7 @@

     unsigned int var = 0, uv_sse;

 #if GLOBAL_MOTION

     unsigned int y_sse;

+    BLOCK_SIZE bsize;

 #endif

     vp9_setup_pre_planes(xd, 0, yv12, mi_row, mi_col,

         &cm->frame_refs[LAST_FRAME - 1].sf);

@@ -725,7 +726,16 @@

     mbmi->interp_filter = BILINEAR;

 #if GLOBAL_MOTION

-    y_sse = motion_estimation(cpi, x, BLOCK_64X64);

+    if (mi_row + 4 < cm->mi_rows && mi_col + 4 < cm->mi_cols)

+      bsize = BLOCK_64X64;

+    else if (mi_row + 4 < cm->mi_rows && mi_col + 4 >= cm->mi_cols)

+      bsize = BLOCK_32X64;

+    else if (mi_row + 4 >= cm->mi_rows && mi_col + 4 < cm->mi_cols)

+      bsize = BLOCK_64X32;

+    else

+      bsize = BLOCK_32X32;

+

+    y_sse = motion_estimation(cpi, x, bsize);

 #endif

     vp9_build_inter_predictors_sb(xd, mi_row, mi_col, BLOCK_64X64);