vpn common -> implicit segmentation

This introduces base functions for introducing implicit segmentation.
The code that actually stores the results to the segment map isn't
here yet.   This just prints out the segmentation map results
if you call it.

Uses connected component labeling technique on mbmi info so that only
if 2 mbs are horizontally or vertically touching do they get the same
segment.

vp8next - plumbing for rotation

code to produce taps for rotation ( tapify. py ),  code
for predicting using rotation ( predict_rotated.c ) ,  code
for finding the best rotation find_rotation.c.

didn't checkin code that uses this in the codec.   still work
in progress.

Fixed copyright notice

Change-Id: I450c13cfa41ab2fcb699f3897760370b4935fdf8

1 files changed, 58 insertions, 0 deletions

diff --git a/vp8/encoder/find_rotation.c b/vp8/encoder/find_rotation.c
new file mode 100644
index 000000000..742c0ba81
--- /dev/null
+++ b/vp8/encoder/find_rotation.c
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "block.h"
+#include "variance.h"
+
+#if CONFIG_ROTATION
+
+int vp8_find_best_rotation(MACROBLOCK *x, BLOCK *b, BLOCKD *d, int_mv *bestmv,
+                           int_mv *ref_mv, int *bri, int error_per_bit,
+                           const vp8_variance_fn_ptr_t *vfp, int *mvcost[2],
+                           int *distortion, unsigned int *sse1)
+{
+    unsigned char *z = (*(b->base_src) + b->src);
+
+    int ri;
+
+    int y_stride;
+
+    unsigned int besterr;
+    int br = bestmv->as_mv.row;
+    int bc = bestmv->as_mv.col;
+    unsigned char *y = *(d->base_pre) + d->pre + br * d->pre_stride + bc;
+    y_stride = d->pre_stride;
+
+    // calculate central point error
+    besterr = vfp->vf(y, y_stride, z, b->src_stride, sse1);
+    *distortion = besterr;
+
+    // find the best matching rotation
+    *bri = 5;
+    for (ri = 0; ri < ROTATIONS; ri++)
+    {
+        unsigned int this_err;
+        unsigned char pb[256];
+        predict_rotated_16x16(ri, y, y_stride, pb, 16);
+        this_err = vfp->vf(pb, 16, z, b->src_stride, sse1);
+
+        if (this_err < besterr)
+        {
+            *bri = ri;
+            besterr = this_err;
+        }
+    }
+    *sse1 = besterr;
+    *distortion = besterr;
+
+    return 0;
+}
+
+#endif