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/*
* Copyright (c) 2010 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 <math.h>
#include "./vp8_rtcd.h"
void vp8_short_fdct4x4_c(short *input, short *output, int pitch) {
int i;
int a1, b1, c1, d1;
short *ip = input;
short *op = output;
for (i = 0; i < 4; ++i) {
a1 = ((ip[0] + ip[3]) * 8);
b1 = ((ip[1] + ip[2]) * 8);
c1 = ((ip[1] - ip[2]) * 8);
d1 = ((ip[0] - ip[3]) * 8);
op[0] = a1 + b1;
op[2] = a1 - b1;
op[1] = (c1 * 2217 + d1 * 5352 + 14500) >> 12;
op[3] = (d1 * 2217 - c1 * 5352 + 7500) >> 12;
ip += pitch / 2;
op += 4;
}
ip = output;
op = output;
for (i = 0; i < 4; ++i) {
a1 = ip[0] + ip[12];
b1 = ip[4] + ip[8];
c1 = ip[4] - ip[8];
d1 = ip[0] - ip[12];
op[0] = (a1 + b1 + 7) >> 4;
op[8] = (a1 - b1 + 7) >> 4;
op[4] = ((c1 * 2217 + d1 * 5352 + 12000) >> 16) + (d1 != 0);
op[12] = (d1 * 2217 - c1 * 5352 + 51000) >> 16;
ip++;
op++;
}
}
void vp8_short_fdct8x4_c(short *input, short *output, int pitch) {
vp8_short_fdct4x4_c(input, output, pitch);
vp8_short_fdct4x4_c(input + 4, output + 16, pitch);
}
void vp8_short_walsh4x4_c(short *input, short *output, int pitch) {
int i;
int a1, b1, c1, d1;
int a2, b2, c2, d2;
short *ip = input;
short *op = output;
for (i = 0; i < 4; ++i) {
a1 = ((ip[0] + ip[2]) * 4);
d1 = ((ip[1] + ip[3]) * 4);
c1 = ((ip[1] - ip[3]) * 4);
b1 = ((ip[0] - ip[2]) * 4);
op[0] = a1 + d1 + (a1 != 0);
op[1] = b1 + c1;
op[2] = b1 - c1;
op[3] = a1 - d1;
ip += pitch / 2;
op += 4;
}
ip = output;
op = output;
for (i = 0; i < 4; ++i) {
a1 = ip[0] + ip[8];
d1 = ip[4] + ip[12];
c1 = ip[4] - ip[12];
b1 = ip[0] - ip[8];
a2 = a1 + d1;
b2 = b1 + c1;
c2 = b1 - c1;
d2 = a1 - d1;
a2 += a2 < 0;
b2 += b2 < 0;
c2 += c2 < 0;
d2 += d2 < 0;
op[0] = (a2 + 3) >> 3;
op[4] = (b2 + 3) >> 3;
op[8] = (c2 + 3) >> 3;
op[12] = (d2 + 3) >> 3;
ip++;
op++;
}
}
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