зеркало из https://github.com/mozilla/gecko-dev.git
373 строки
10 KiB
C
373 строки
10 KiB
C
/*
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* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <stdlib.h>
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#include "loopfilter.h"
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#include "onyxc_int.h"
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#ifdef __SUNPRO_C
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#define __inline inline
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#endif
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#define NEW_LOOPFILTER_MASK
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typedef unsigned char uc;
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static __inline signed char vp8_signed_char_clamp(int t)
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{
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t = (t < -128 ? -128 : t);
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t = (t > 127 ? 127 : t);
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return (signed char) t;
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}
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// should we apply any filter at all ( 11111111 yes, 00000000 no)
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static __inline signed char vp8_filter_mask(signed char limit, signed char flimit,
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uc p3, uc p2, uc p1, uc p0, uc q0, uc q1, uc q2, uc q3)
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{
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signed char mask = 0;
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mask |= (abs(p3 - p2) > limit) * -1;
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mask |= (abs(p2 - p1) > limit) * -1;
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mask |= (abs(p1 - p0) > limit) * -1;
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mask |= (abs(q1 - q0) > limit) * -1;
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mask |= (abs(q2 - q1) > limit) * -1;
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mask |= (abs(q3 - q2) > limit) * -1;
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#ifndef NEW_LOOPFILTER_MASK
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mask |= (abs(p0 - q0) > flimit) * -1;
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#else
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mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > flimit * 2 + limit) * -1;
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#endif
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mask = ~mask;
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return mask;
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}
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// is there high variance internal edge ( 11111111 yes, 00000000 no)
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static __inline signed char vp8_hevmask(signed char thresh, uc p1, uc p0, uc q0, uc q1)
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{
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signed char hev = 0;
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hev |= (abs(p1 - p0) > thresh) * -1;
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hev |= (abs(q1 - q0) > thresh) * -1;
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return hev;
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}
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static __inline void vp8_filter(signed char mask, signed char hev, uc *op1, uc *op0, uc *oq0, uc *oq1)
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{
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signed char ps0, qs0;
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signed char ps1, qs1;
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signed char vp8_filter, Filter1, Filter2;
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signed char u;
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ps1 = (signed char) * op1 ^ 0x80;
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ps0 = (signed char) * op0 ^ 0x80;
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qs0 = (signed char) * oq0 ^ 0x80;
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qs1 = (signed char) * oq1 ^ 0x80;
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// add outer taps if we have high edge variance
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vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
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vp8_filter &= hev;
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// inner taps
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vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
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vp8_filter &= mask;
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// save bottom 3 bits so that we round one side +4 and the other +3
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// if it equals 4 we'll set to adjust by -1 to account for the fact
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// we'd round 3 the other way
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Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
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Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
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Filter1 >>= 3;
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Filter2 >>= 3;
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u = vp8_signed_char_clamp(qs0 - Filter1);
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*oq0 = u ^ 0x80;
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u = vp8_signed_char_clamp(ps0 + Filter2);
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*op0 = u ^ 0x80;
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vp8_filter = Filter1;
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// outer tap adjustments
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vp8_filter += 1;
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vp8_filter >>= 1;
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vp8_filter &= ~hev;
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u = vp8_signed_char_clamp(qs1 - vp8_filter);
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*oq1 = u ^ 0x80;
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u = vp8_signed_char_clamp(ps1 + vp8_filter);
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*op1 = u ^ 0x80;
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}
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void vp8_loop_filter_horizontal_edge_c
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(
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unsigned char *s,
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int p, //pitch
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const signed char *flimit,
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const signed char *limit,
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const signed char *thresh,
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int count
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)
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{
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int hev = 0; // high edge variance
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signed char mask = 0;
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int i = 0;
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// loop filter designed to work using chars so that we can make maximum use
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// of 8 bit simd instructions.
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do
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{
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mask = vp8_filter_mask(limit[i], flimit[i],
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s[-4*p], s[-3*p], s[-2*p], s[-1*p],
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s[0*p], s[1*p], s[2*p], s[3*p]);
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hev = vp8_hevmask(thresh[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
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vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p);
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++s;
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}
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while (++i < count * 8);
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}
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void vp8_loop_filter_vertical_edge_c
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(
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unsigned char *s,
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int p,
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const signed char *flimit,
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const signed char *limit,
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const signed char *thresh,
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int count
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)
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{
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int hev = 0; // high edge variance
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signed char mask = 0;
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int i = 0;
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// loop filter designed to work using chars so that we can make maximum use
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// of 8 bit simd instructions.
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do
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{
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mask = vp8_filter_mask(limit[i], flimit[i],
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s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
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hev = vp8_hevmask(thresh[i], s[-2], s[-1], s[0], s[1]);
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vp8_filter(mask, hev, s - 2, s - 1, s, s + 1);
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s += p;
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}
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while (++i < count * 8);
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}
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static __inline void vp8_mbfilter(signed char mask, signed char hev,
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uc *op2, uc *op1, uc *op0, uc *oq0, uc *oq1, uc *oq2)
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{
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signed char s, u;
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signed char vp8_filter, Filter1, Filter2;
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signed char ps2 = (signed char) * op2 ^ 0x80;
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signed char ps1 = (signed char) * op1 ^ 0x80;
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signed char ps0 = (signed char) * op0 ^ 0x80;
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signed char qs0 = (signed char) * oq0 ^ 0x80;
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signed char qs1 = (signed char) * oq1 ^ 0x80;
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signed char qs2 = (signed char) * oq2 ^ 0x80;
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// add outer taps if we have high edge variance
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vp8_filter = vp8_signed_char_clamp(ps1 - qs1);
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vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (qs0 - ps0));
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vp8_filter &= mask;
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Filter2 = vp8_filter;
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Filter2 &= hev;
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// save bottom 3 bits so that we round one side +4 and the other +3
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Filter1 = vp8_signed_char_clamp(Filter2 + 4);
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Filter2 = vp8_signed_char_clamp(Filter2 + 3);
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Filter1 >>= 3;
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Filter2 >>= 3;
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qs0 = vp8_signed_char_clamp(qs0 - Filter1);
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ps0 = vp8_signed_char_clamp(ps0 + Filter2);
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// only apply wider filter if not high edge variance
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vp8_filter &= ~hev;
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Filter2 = vp8_filter;
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// roughly 3/7th difference across boundary
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u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7);
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s = vp8_signed_char_clamp(qs0 - u);
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*oq0 = s ^ 0x80;
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s = vp8_signed_char_clamp(ps0 + u);
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*op0 = s ^ 0x80;
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// roughly 2/7th difference across boundary
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u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7);
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s = vp8_signed_char_clamp(qs1 - u);
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*oq1 = s ^ 0x80;
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s = vp8_signed_char_clamp(ps1 + u);
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*op1 = s ^ 0x80;
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// roughly 1/7th difference across boundary
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u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7);
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s = vp8_signed_char_clamp(qs2 - u);
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*oq2 = s ^ 0x80;
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s = vp8_signed_char_clamp(ps2 + u);
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*op2 = s ^ 0x80;
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}
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void vp8_mbloop_filter_horizontal_edge_c
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(
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unsigned char *s,
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int p,
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const signed char *flimit,
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const signed char *limit,
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const signed char *thresh,
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int count
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)
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{
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signed char hev = 0; // high edge variance
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signed char mask = 0;
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int i = 0;
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// loop filter designed to work using chars so that we can make maximum use
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// of 8 bit simd instructions.
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do
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{
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mask = vp8_filter_mask(limit[i], flimit[i],
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s[-4*p], s[-3*p], s[-2*p], s[-1*p],
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s[0*p], s[1*p], s[2*p], s[3*p]);
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hev = vp8_hevmask(thresh[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
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vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p, s + 2 * p);
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++s;
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}
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while (++i < count * 8);
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}
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void vp8_mbloop_filter_vertical_edge_c
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(
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unsigned char *s,
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int p,
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const signed char *flimit,
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const signed char *limit,
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const signed char *thresh,
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int count
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)
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{
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signed char hev = 0; // high edge variance
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signed char mask = 0;
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int i = 0;
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do
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{
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mask = vp8_filter_mask(limit[i], flimit[i],
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s[-4], s[-3], s[-2], s[-1], s[0], s[1], s[2], s[3]);
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hev = vp8_hevmask(thresh[i], s[-2], s[-1], s[0], s[1]);
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vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2);
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s += p;
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}
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while (++i < count * 8);
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}
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// should we apply any filter at all ( 11111111 yes, 00000000 no)
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static __inline signed char vp8_simple_filter_mask(signed char limit, signed char flimit, uc p1, uc p0, uc q0, uc q1)
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{
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// Why does this cause problems for win32?
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// error C2143: syntax error : missing ';' before 'type'
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// (void) limit;
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#ifndef NEW_LOOPFILTER_MASK
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signed char mask = (abs(p0 - q0) <= flimit) * -1;
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#else
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signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= flimit * 2 + limit) * -1;
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#endif
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return mask;
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}
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static __inline void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0, uc *oq1)
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{
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signed char vp8_filter, Filter1, Filter2;
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signed char p1 = (signed char) * op1 ^ 0x80;
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signed char p0 = (signed char) * op0 ^ 0x80;
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signed char q0 = (signed char) * oq0 ^ 0x80;
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signed char q1 = (signed char) * oq1 ^ 0x80;
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signed char u;
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vp8_filter = vp8_signed_char_clamp(p1 - q1);
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vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * (q0 - p0));
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vp8_filter &= mask;
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// save bottom 3 bits so that we round one side +4 and the other +3
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Filter1 = vp8_signed_char_clamp(vp8_filter + 4);
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Filter1 >>= 3;
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u = vp8_signed_char_clamp(q0 - Filter1);
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*oq0 = u ^ 0x80;
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Filter2 = vp8_signed_char_clamp(vp8_filter + 3);
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Filter2 >>= 3;
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u = vp8_signed_char_clamp(p0 + Filter2);
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*op0 = u ^ 0x80;
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}
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void vp8_loop_filter_simple_horizontal_edge_c
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(
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unsigned char *s,
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int p,
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const signed char *flimit,
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const signed char *limit,
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const signed char *thresh,
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int count
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)
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{
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signed char mask = 0;
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int i = 0;
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(void) thresh;
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do
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{
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//mask = vp8_simple_filter_mask( limit[i], flimit[i],s[-1*p],s[0*p]);
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mask = vp8_simple_filter_mask(limit[i], flimit[i], s[-2*p], s[-1*p], s[0*p], s[1*p]);
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vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p);
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++s;
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}
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while (++i < count * 8);
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}
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void vp8_loop_filter_simple_vertical_edge_c
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(
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unsigned char *s,
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int p,
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const signed char *flimit,
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const signed char *limit,
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const signed char *thresh,
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int count
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)
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{
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signed char mask = 0;
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int i = 0;
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(void) thresh;
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do
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{
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//mask = vp8_simple_filter_mask( limit[i], flimit[i],s[-1],s[0]);
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mask = vp8_simple_filter_mask(limit[i], flimit[i], s[-2], s[-1], s[0], s[1]);
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vp8_simple_filter(mask, s - 2, s - 1, s, s + 1);
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s += p;
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}
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while (++i < count * 8);
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}
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