Removed shadow warnings : loopfilter*.c

Adding -Wshadow to CFLAGS generated a bunch of warnings.  This commit
is based on work already done by jzern.

Change-Id: Iefc08a7ab601c4d1b507f039577433bfb1c6cc9d

vp8/common/loopfilter.c

@@ -156,39 +156,38 @@ void vp8_loop_filter_frame_init(VP8_COMMON *cm,
             continue;
         }
 
-        lvl_ref = lvl_seg;
-
         /* INTRA_FRAME */
         ref = INTRA_FRAME;
 
         /* Apply delta for reference frame */
-        lvl_ref += mbd->ref_lf_deltas[ref];
+        lvl_ref = lvl_seg + mbd->ref_lf_deltas[ref];
 
         /* Apply delta for Intra modes */
         mode = 0; /* B_PRED */
         /* Only the split mode BPRED has a further special case */
-        lvl_mode = lvl_ref +  mbd->mode_lf_deltas[mode];
-        lvl_mode = (lvl_mode > 0) ? (lvl_mode > 63 ? 63 : lvl_mode) : 0; /* clamp */
+        lvl_mode = lvl_ref + mbd->mode_lf_deltas[mode];
+        /* clamp */
+        lvl_mode = (lvl_mode > 0) ? (lvl_mode > 63 ? 63 : lvl_mode) : 0;
 
         lfi->lvl[seg][ref][mode] = lvl_mode;
 
         mode = 1; /* all the rest of Intra modes */
-        lvl_mode = (lvl_ref > 0) ? (lvl_ref > 63 ? 63 : lvl_ref)  : 0; /* clamp */
+        /* clamp */
+        lvl_mode = (lvl_ref > 0) ? (lvl_ref > 63 ? 63 : lvl_ref) : 0;
         lfi->lvl[seg][ref][mode] = lvl_mode;
 
         /* LAST, GOLDEN, ALT */
         for(ref = 1; ref < MAX_REF_FRAMES; ref++)
         {
-            int lvl_ref = lvl_seg;
-
             /* Apply delta for reference frame */
-            lvl_ref += mbd->ref_lf_deltas[ref];
+            lvl_ref = lvl_seg + mbd->ref_lf_deltas[ref];
 
             /* Apply delta for Inter modes */
             for (mode = 1; mode < 4; mode++)
             {
                 lvl_mode = lvl_ref + mbd->mode_lf_deltas[mode];
-                lvl_mode = (lvl_mode > 0) ? (lvl_mode > 63 ? 63 : lvl_mode) : 0; /* clamp */
+                /* clamp */
+                lvl_mode = (lvl_mode > 0) ? (lvl_mode > 63 ? 63 : lvl_mode) : 0;
 
                 lfi->lvl[seg][ref][mode] = lvl_mode;
             }

vp8/common/loopfilter_filters.c

@@ -54,7 +54,7 @@ static void vp8_filter(signed char mask, uc hev, uc *op1,
 {
     signed char ps0, qs0;
     signed char ps1, qs1;
-    signed char vp8_filter, Filter1, Filter2;
+    signed char filter_value, Filter1, Filter2;
     signed char u;
 
     ps1 = (signed char) * op1 ^ 0x80;
@@ -63,35 +63,35 @@ static void vp8_filter(signed char mask, uc hev, uc *op1,
     qs1 = (signed char) * oq1 ^ 0x80;
 
     /* add outer taps if we have high edge variance */
-    vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
-    vp8_filter &= hev;
+    filter_value = vp8_signed_char_clamp(ps1 - qs1);
+    filter_value &= hev;
 
     /* inner taps */
-    vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
-    vp8_filter &= mask;
+    filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0));
+    filter_value &= mask;
 
     /* save bottom 3 bits so that we round one side +4 and the other +3
      * if it equals 4 we'll set to adjust by -1 to account for the fact
      * we'd round 3 the other way
      */
-    Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
-    Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
+    Filter1 = vp8_signed_char_clamp(filter_value + 4);
+    Filter2 = vp8_signed_char_clamp(filter_value + 3);
     Filter1 >>= 3;
     Filter2 >>= 3;
     u = vp8_signed_char_clamp(qs0 - Filter1);
     *oq0 = u ^ 0x80;
     u = vp8_signed_char_clamp(ps0 + Filter2);
     *op0 = u ^ 0x80;
-    vp8_filter = Filter1;
+    filter_value = Filter1;
 
     /* outer tap adjustments */
-    vp8_filter += 1;
-    vp8_filter >>= 1;
-    vp8_filter &= ~hev;
+    filter_value += 1;
+    filter_value >>= 1;
+    filter_value &= ~hev;
 
-    u = vp8_signed_char_clamp(qs1 - vp8_filter);
+    u = vp8_signed_char_clamp(qs1 - filter_value);
     *oq1 = u ^ 0x80;
-    u = vp8_signed_char_clamp(ps1 + vp8_filter);
+    u = vp8_signed_char_clamp(ps1 + filter_value);
     *op1 = u ^ 0x80;
 
 }
@@ -162,7 +162,7 @@ static void vp8_mbfilter(signed char mask, uc hev,
                            uc *op2, uc *op1, uc *op0, uc *oq0, uc *oq1, uc *oq2)
 {
     signed char s, u;
-    signed char vp8_filter, Filter1, Filter2;
+    signed char filter_value, Filter1, Filter2;
     signed char ps2 = (signed char) * op2 ^ 0x80;
     signed char ps1 = (signed char) * op1 ^ 0x80;
     signed char ps0 = (signed char) * op0 ^ 0x80;
@@ -171,11 +171,11 @@ static void vp8_mbfilter(signed char mask, uc hev,
     signed char qs2 = (signed char) * oq2 ^ 0x80;
 
     /* add outer taps if we have high edge variance */
-    vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
-    vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
-    vp8_filter &= mask;
+    filter_value = vp8_signed_char_clamp(ps1 - qs1);
+    filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0));
+    filter_value &= mask;
 
-    Filter2 = vp8_filter;
+    Filter2 = filter_value;
     Filter2 &= hev;
 
     /* save bottom 3 bits so that we round one side +4 and the other +3 */
@@ -188,8 +188,8 @@ static void vp8_mbfilter(signed char mask, uc hev,
 
 
     /* only apply wider filter if not high edge variance */
-    vp8_filter &= ~hev;
-    Filter2 = vp8_filter;
+    filter_value &= ~hev;
+    Filter2 = filter_value;
 
     /* roughly 3/7th difference across boundary */
     u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
@@ -291,24 +291,24 @@ static signed char vp8_simple_filter_mask(uc blimit, uc p1, uc p0, uc q0, uc q1)
 
 static void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0, uc *oq1)
 {
-    signed char vp8_filter, Filter1, Filter2;
+    signed char filter_value, Filter1, Filter2;
     signed char p1 = (signed char) * op1 ^ 0x80;
     signed char p0 = (signed char) * op0 ^ 0x80;
     signed char q0 = (signed char) * oq0 ^ 0x80;
     signed char q1 = (signed char) * oq1 ^ 0x80;
     signed char u;
 
-    vp8_filter = vp8_signed_char_clamp(p1 - q1);
-    vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (q0 - p0));
-    vp8_filter &= mask;
+    filter_value = vp8_signed_char_clamp(p1 - q1);
+    filter_value = vp8_signed_char_clamp(filter_value + 3 * (q0 - p0));
+    filter_value &= mask;
 
     /* save bottom 3 bits so that we round one side +4 and the other +3 */
-    Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
+    Filter1 = vp8_signed_char_clamp(filter_value + 4);
     Filter1 >>= 3;
     u = vp8_signed_char_clamp(q0 - Filter1);
     *oq0  = u ^ 0x80;
 
-    Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
+    Filter2 = vp8_signed_char_clamp(filter_value + 3);
     Filter2 >>= 3;
     u = vp8_signed_char_clamp(p0 + Filter2);
     *op0 = u ^ 0x80;