LPF_SB: set row delay to work with intrabc

Intrabc search area can't use pixels of the last 8 rows in the current
superblock row. Add a delay so that lpf_sb can work with intrabc.

Let lpf_sb on with intrabc while other loop filtering off (cdef, loop
restoration).

Change-Id: I98ab093a17096387b6233182da2656f90dfa09eb

av1/common/enums.h

diff --git a/av1/common/enums.h b/av1/common/enums.h
index ee48306..3425c97 100644
--- a/av1/common/enums.h
+++ b/av1/common/enums.h
@@ -103,10 +103,10 @@
 #define LPF_SIGN_CONTEXT 2
 
 // Half of maximum loop filter length (15-tap)
-#define FILT_BOUNDARY_OFFSET 8
+#define FILT_BOUNDARY_OFFSET 0
 #define FILT_BOUNDARY_MI_OFFSET (FILT_BOUNDARY_OFFSET >> MI_SIZE_LOG2)
 
-#define USE_GUESS_LEVEL 1
+#define USE_GUESS_LEVEL 0
 #define USE_LOOP_FILTER_SUPERBLOCK 1
 #endif  // CONFIG_LPF_SB
 

av1/common/mvref_common.h

diff --git a/av1/common/mvref_common.h b/av1/common/mvref_common.h
index eace078..4b0f884 100644
--- a/av1/common/mvref_common.h
+++ b/av1/common/mvref_common.h
@@ -476,6 +476,7 @@
 #define INTRABC_DELAY_PIXELS 256  //  Delay of 256 pixels
 #define INTRABC_DELAY_SB64 (INTRABC_DELAY_PIXELS / 64)
 #define USE_WAVE_FRONT 1  // Use only top left area of frame for reference.
+#define INTRABC_ROW_DELAY 8
 static INLINE int av1_is_dv_valid(const MV dv, const TileInfo *const tile,
                                   int mi_row, int mi_col, BLOCK_SIZE bsize,
                                   int mib_size_log2) {
@@ -514,6 +515,20 @@
   const int active_sb64 = active_sb_row * total_sb64_per_row + active_sb64_col;
   const int src_sb64 = src_sb_row * total_sb64_per_row + src_sb64_col;
   if (src_sb64 >= active_sb64 - INTRABC_DELAY_SB64) return 0;
+
+#if CONFIG_LPF_SB
+  // Because of loop filter, the last 8 rows of current superblock row can't be
+  // used as intrabc search area.
+  if ((src_bottom_edge >> 3) >=
+      (active_sb_row + 1) * sb_size - INTRABC_ROW_DELAY)
+    return 0;
+
+  // The last 8 rows of the above superblock is invalid
+  if ((src_bottom_edge >> 3) >= active_sb_row * sb_size - INTRABC_ROW_DELAY &&
+      (src_right_edge >> 3) >= (mi_col >> mib_size_log2) * sb_size)
+    return 0;
+#endif  // CONFIG_LPF_SB
+
 #if USE_WAVE_FRONT
   const int gradient = 1 + INTRABC_DELAY_SB64 + (sb_size > 64);
   const int wf_offset = gradient * (active_sb_row - src_sb_row);

av1/decoder/decodeframe.c

diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index 7200a91..ef5f370 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -1109,9 +1109,9 @@
 #endif  // CONFIG_LOOP_RESTORATION
 
 static void setup_loopfilter(AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
-#if CONFIG_INTRABC
+#if CONFIG_INTRABC && !CONFIG_LPF_SB
   if (cm->allow_intrabc && NO_FILTER_FOR_IBC) return;
-#endif  // CONFIG_INTRABC
+#endif  // CONFIG_INTRABC && !CONFIG_LPF_SB
   struct loopfilter *lf = &cm->lf;
 #if CONFIG_LOOPFILTER_LEVEL
   lf->filter_level[0] = aom_rb_read_literal(rb, 6);
@@ -2241,9 +2241,9 @@
       av1_frameworker_broadcast(pbi->cur_buf, mi_row << cm->mib_size_log2);
   }
 
-#if CONFIG_INTRABC
+#if CONFIG_INTRABC && !CONFIG_LPF_SB
   if (!(cm->allow_intrabc && NO_FILTER_FOR_IBC))
-#endif  // CONFIG_INTRABC
+#endif  // CONFIG_INTRABC && !CONFIG_LPF_SB
   {
 // Loopfilter the whole frame.
 #if CONFIG_LPF_SB

av1/encoder/bitstream.c

diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index 73db844..ba271c7 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -2578,9 +2578,9 @@
 #endif  // CONFIG_LOOP_RESTORATION
 
 static void encode_loopfilter(AV1_COMMON *cm, struct aom_write_bit_buffer *wb) {
-#if CONFIG_INTRABC
+#if CONFIG_INTRABC && !CONFIG_LPF_SB
   if (cm->allow_intrabc && NO_FILTER_FOR_IBC) return;
-#endif  // CONFIG_INTRABC
+#endif  // CONFIG_INTRABC && !CONFIG_LPF_SB
   int i;
   struct loopfilter *lf = &cm->lf;