postproc : Added SPLITMV visualization, fix line constrain.

Now draw 16 vectors for SPLITMV mode.

Fixed constrain line to block divide by zero issues.

Blend block was not centering the shaded area correctly.

Change-Id: I1edabd8b4e553aac8d980f7b45c80159e9202434

diff --git a/vp8/common/postproc.c b/vp8/common/postproc.c
index 6f419435a43db5804264b7b7ffdc7b063707db57..d7044fd573fb2800c0de515d8bc3b512d7a492e7 100644 (file)
--- a/vp8/common/postproc.c
+++ b/vp8/common/postproc.c
@@ -484,7 +484,7 @@ void vp8_blend_mb_c (unsigned char *y, unsigned char *u, unsigned char *v,
     int u1_const = u1*((1<<16)-alpha);
     int v1_const = v1*((1<<16)-alpha);
 
-    y += stride + 2;
+    y += stride + 1;
     for (i = 0; i < 14; i++)
     {
         for (j = 0; j < 14; j++)
@@ -522,7 +522,7 @@ static void constrain_line (int x0, int *x1, int y0, int *y1, int width, int hei
         dy = *y1 - y0;
 
         *x1 = width;
-        if (dy)
+        if (dx)
             *y1 = ((width-x0)*dy)/dx + y0;
     }
     if (*x1 < 0)
@@ -531,7 +531,7 @@ static void constrain_line (int x0, int *x1, int y0, int *y1, int width, int hei
         dy = *y1 - y0;
 
         *x1 = 0;
-        if (dy)
+        if (dx)
             *y1 = ((0-x0)*dy)/dx + y0;
     }
     if (*y1 > height)
@@ -540,7 +540,7 @@ static void constrain_line (int x0, int *x1, int y0, int *y1, int width, int hei
         dy = *y1 - y0;
 
         *y1 = height;
-        if (dx)
+        if (dy)
             *x1 = ((height-y0)*dx)/dy + x0;
     }
     if (*y1 < 0)
@@ -549,7 +549,7 @@ static void constrain_line (int x0, int *x1, int y0, int *y1, int width, int hei
         dy = *y1 - y0;
 
         *y1 = 0;
-        if (dx)
+        if (dy)
             *x1 = ((0-y0)*dx)/dy + x0;
     }
 }
@@ -753,8 +753,36 @@ int vp8_post_proc_frame(VP8_COMMON *oci, YV12_BUFFER_CONFIG *dest, int deblock_l
         {
             for (x0 = 8; x0 < (width + 8); x0 += 16)
             {
-               int x1, y1;
-               if (mi->mbmi.mode >= NEARESTMV)
+                int x1, y1;
+
+                if (mi->mbmi.mode == SPLITMV)
+                {
+                    int bx0, by0;
+
+                    B_MODE_INFO *bmi = mi->bmi;
+                    MV *mv = &bmi->mv.as_mv;
+
+                    for (by0 = (y0-8); by0 < y0+8; by0 += 4)
+                    {
+                        for (bx0 = (x0-8); bx0 < x0+8; bx0 += 4)
+                        {
+
+                            x1 = bx0 + (mv->col >> 3);
+                            y1 = by0 + (mv->row >> 3);
+
+                            if (x1 != bx0 && y1 != by0)
+                            {
+                                constrain_line (bx0, &x1, by0, &y1, width, height);
+                                vp8_blit_line  (bx0,  x1, by0,  y1, y_buffer, y_stride);
+                            }
+                            else
+                                vp8_blit_line  (bx0,  x1, by0,  y1, y_buffer, y_stride);
+
+                            mv++;
+                        }
+                    }
+                }
+                else if (mi->mbmi.mode >= NEARESTMV)
                 {
                     MV *mv = &mi->mbmi.mv.as_mv;