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/**
* FreeRDP: A Remote Desktop Protocol client.
* RemoteFX Codec Library - DWT
*
* Copyright 2011 Vic Lee
* Copyright 2014-2017 Jay Sorg <jay.sorg@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rfxcommon.h"
/******************************************************************************/
static int
rfx_dwt_2d_encode_horz(sint16 *buffer, sint16 *dwt, int subband_width)
{
sint16 *l_src, *h_src;
sint16 *hl, *lh, *hh, *ll;
int x, y;
int n;
/* DWT in horizontal direction, results in 4 sub-bands in
* HL(0), LH(1), HH(2), LL(3) order, stored in original buffer. */
/* The lower part L generates LL(3) and HL(0). */
/* The higher part H generates LH(1) and HH(2). */
ll = buffer + subband_width * subband_width * 3;
hl = buffer;
l_src = dwt;
lh = buffer + subband_width * subband_width;
hh = buffer + subband_width * subband_width * 2;
h_src = dwt + subband_width * subband_width * 2;
for (y = 0; y < subband_width; y++)
{
/* pre */
hl[0] = (l_src[1] - ((l_src[0] + l_src[2]) >> 1)) >> 1;
ll[0] = l_src[0] + hl[0];
/* loop */
for (n = 1; n < subband_width - 1; n++)
{
x = n << 1;
hl[n] = (l_src[x + 1] - ((l_src[x] + l_src[x + 2]) >> 1)) >> 1;
ll[n] = l_src[x] + ((hl[n - 1] + hl[n]) >> 1);
}
/* post */
n = subband_width - 1;
x = n << 1;
hl[n] = (l_src[x + 1] - ((l_src[x] + l_src[x]) >> 1)) >> 1;
ll[n] = l_src[x] + ((hl[n - 1] + hl[n]) >> 1);
/* pre */
hh[0] = (h_src[1] - ((h_src[0] + h_src[2]) >> 1)) >> 1;
lh[0] = h_src[0] + hh[0];
/* loop */
for (n = 1; n < subband_width - 1; n++)
{
x = n << 1;
hh[n] = (h_src[x + 1] - ((h_src[x] + h_src[x + 2]) >> 1)) >> 1;
lh[n] = h_src[x] + ((hh[n - 1] + hh[n]) >> 1);
}
/* post */
n = subband_width - 1;
x = n << 1;
hh[n] = (h_src[x + 1] - ((h_src[x] + h_src[x]) >> 1)) >> 1;
lh[n] = h_src[x] + ((hh[n - 1] + hh[n]) >> 1);
ll += subband_width;
hl += subband_width;
l_src += subband_width << 1;
lh += subband_width;
hh += subband_width;
h_src += subband_width << 1;
}
return 0;
}
/******************************************************************************/
static int
rfx_dwt_2d_encode_block(sint16 *buffer, sint16 *dwt, int subband_width)
{
sint16 *src, *l, *h;
int total_width;
int x, y;
int n;
total_width = subband_width << 1;
/* DWT in vertical direction, results in 2 sub-bands in L, H order in
* tmp buffer dwt. */
for (x = 0; x < total_width; x++)
{
/* pre */
l = dwt + x;
h = l + subband_width * total_width;
src = buffer + x;
*h = (src[total_width] - ((src[0] + src[2 * total_width]) >> 1)) >> 1;
*l = src[0] + (*h);
/* loop */
for (n = 1; n < subband_width - 1; n++)
{
y = n << 1;
l = dwt + n * total_width + x;
h = l + subband_width * total_width;
src = buffer + y * total_width + x;
*h = (src[total_width] - ((src[0] + src[2 * total_width]) >> 1)) >> 1;
*l = src[0] + ((*(h - total_width) + *h) >> 1);
}
/* post */
n = subband_width - 1;
y = n << 1;
l = dwt + n * total_width + x;
h = l + subband_width * total_width;
src = buffer + y * total_width + x;
*h = (src[total_width] - ((src[0] + src[0]) >> 1)) >> 1;
*l = src[0] + ((*(h - total_width) + *h) >> 1);
}
return rfx_dwt_2d_encode_horz(buffer, dwt, subband_width);
}
/******************************************************************************/
static int
rfx_dwt_2d_encode_block8(const uint8 *in_buffer,
sint16 *buffer, sint16 *dwt, int subband_width)
{
const uint8 *src;
sint16 *l, *h;
sint16 s1, s2, s3;
int total_width;
int x, y;
int n;
total_width = subband_width << 1;
/* DWT in vertical direction, results in 2 sub-bands in L, H order in
* tmp buffer dwt. */
for (x = 0; x < total_width; x++)
{
/* pre */
l = dwt + x;
h = l + subband_width * total_width;
src = in_buffer + x;
s1 = (src[total_width] - 128) << DWT_FACTOR;
s2 = (src[0] - 128) << DWT_FACTOR;
s3 = (src[2 * total_width] - 128) << DWT_FACTOR;
*h = (s1 - ((s2 + s3) >> 1)) >> 1;
s1 = (src[0] - 128) << DWT_FACTOR;
*l = s1 + *h;
/* loop */
for (n = 1; n < subband_width - 1; n++)
{
y = n << 1;
l = dwt + n * total_width + x;
h = l + subband_width * total_width;
src = in_buffer + y * total_width + x;
s1 = (src[total_width] - 128) << DWT_FACTOR;
s2 = (src[0] - 128) << DWT_FACTOR;
s3 = (src[2 * total_width] - 128) << DWT_FACTOR;
*h = (s1 - ((s2 + s3) >> 1)) >> 1;
s1 = (src[0] - 128) << DWT_FACTOR;
*l = s1 + ((*(h - total_width) + *h) >> 1);
}
/* post */
n = subband_width - 1;
y = n << 1;
l = dwt + n * total_width + x;
h = l + subband_width * total_width;
src = in_buffer + y * total_width + x;
s1 = (src[total_width] - 128) << DWT_FACTOR;
s2 = (src[0] - 128) << DWT_FACTOR;
s3 = (src[0] - 128) << DWT_FACTOR;
*h = (s1 - ((s2 + s3) >> 1)) >> 1;
s1 = (src[0] - 128) << DWT_FACTOR;
*l = s1 + ((*(h - total_width) + *h) >> 1);
}
return rfx_dwt_2d_encode_horz(buffer, dwt, subband_width);
}
/******************************************************************************/
int
rfx_dwt_2d_encode(const uint8 *in_buffer, sint16 *buffer, sint16 *dwt_buffer)
{
rfx_dwt_2d_encode_block8(in_buffer, buffer, dwt_buffer, 32);
rfx_dwt_2d_encode_block(buffer + 3072, dwt_buffer, 16);
rfx_dwt_2d_encode_block(buffer + 3840, dwt_buffer, 8);
return 0;
}
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