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/* Copyright (C) 2000-2003 Constantin Kaplinsky. All Rights Reserved.
* Copyright 2004-2005 Cendio AB.
* Copyright 2009-2015 Pierre Ossman for Cendio AB
* Copyright (C) 2011 D. R. Commander. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// Tight decoding functions.
//
// This file is #included after having set the following macro:
// BPP - 8, 16 or 32
namespace rfb {
// CONCAT2E concatenates its arguments, expanding them if they are macros
#ifndef CONCAT2E
#define CONCAT2(a,b) a##b
#define CONCAT2E(a,b) CONCAT2(a,b)
#endif
#define PIXEL_T rdr::CONCAT2E(U,BPP)
#if BPP == 32
void
TightDecoder::FilterGradient24(const rdr::U8 *inbuf,
const PixelFormat& pf, PIXEL_T* outbuf,
int stride, const Rect& r)
{
int x, y, c;
rdr::U8 prevRow[TIGHT_MAX_WIDTH*3];
rdr::U8 thisRow[TIGHT_MAX_WIDTH*3];
rdr::U8 pix[3];
int est[3];
memset(prevRow, 0, sizeof(prevRow));
// Set up shortcut variables
int rectHeight = r.height();
int rectWidth = r.width();
for (y = 0; y < rectHeight; y++) {
/* First pixel in a row */
for (c = 0; c < 3; c++) {
pix[c] = inbuf[y*rectWidth*3+c] + prevRow[c];
thisRow[c] = pix[c];
}
pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride], pix, 1);
/* Remaining pixels of a row */
for (x = 1; x < rectWidth; x++) {
for (c = 0; c < 3; c++) {
est[c] = prevRow[x*3+c] + pix[c] - prevRow[(x-1)*3+c];
if (est[c] > 0xff) {
est[c] = 0xff;
} else if (est[c] < 0) {
est[c] = 0;
}
pix[c] = inbuf[(y*rectWidth+x)*3+c] + est[c];
thisRow[x*3+c] = pix[c];
}
pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride+x], pix, 1);
}
memcpy(prevRow, thisRow, sizeof(prevRow));
}
}
#endif
#if BPP != 8
void TightDecoder::FilterGradient(const rdr::U8* inbuf,
const PixelFormat& pf, PIXEL_T* outbuf,
int stride, const Rect& r)
{
int x, y, c;
static rdr::U8 prevRow[TIGHT_MAX_WIDTH*3];
static rdr::U8 thisRow[TIGHT_MAX_WIDTH*3];
rdr::U8 pix[3];
int est[3];
memset(prevRow, 0, sizeof(prevRow));
// Set up shortcut variables
int rectHeight = r.height();
int rectWidth = r.width();
for (y = 0; y < rectHeight; y++) {
/* First pixel in a row */
pf.rgbFromBuffer(pix, &inbuf[y*rectWidth], 1);
for (c = 0; c < 3; c++)
pix[c] += prevRow[c];
memcpy(thisRow, pix, sizeof(pix));
pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride], pix, 1);
/* Remaining pixels of a row */
for (x = 1; x < rectWidth; x++) {
for (c = 0; c < 3; c++) {
est[c] = prevRow[x*3+c] + pix[c] - prevRow[(x-1)*3+c];
if (est[c] > 255) {
est[c] = 255;
} else if (est[c] < 0) {
est[c] = 0;
}
}
pf.rgbFromBuffer(pix, &inbuf[y*rectWidth+x], 1);
for (c = 0; c < 3; c++)
pix[c] += est[c];
memcpy(&thisRow[x*3], pix, sizeof(pix));
pf.bufferFromRGB((rdr::U8*)&outbuf[y*stride+x], pix, 1);
}
memcpy(prevRow, thisRow, sizeof(prevRow));
}
}
#endif
void TightDecoder::FilterPalette(const PIXEL_T* palette, int palSize,
const rdr::U8* inbuf, PIXEL_T* outbuf,
int stride, const Rect& r)
{
// Indexed color
int x, h = r.height(), w = r.width(), b, pad = stride - w;
PIXEL_T* ptr = outbuf;
rdr::U8 bits;
const rdr::U8* srcPtr = inbuf;
if (palSize <= 2) {
// 2-color palette
while (h > 0) {
for (x = 0; x < w / 8; x++) {
bits = *srcPtr++;
for (b = 7; b >= 0; b--) {
*ptr++ = palette[bits >> b & 1];
}
}
if (w % 8 != 0) {
bits = *srcPtr++;
for (b = 7; b >= 8 - w % 8; b--) {
*ptr++ = palette[bits >> b & 1];
}
}
ptr += pad;
h--;
}
} else {
// 256-color palette
while (h > 0) {
PIXEL_T *endOfRow = ptr + w;
while (ptr < endOfRow) {
*ptr++ = palette[*srcPtr++];
}
ptr += pad;
h--;
}
}
}
#undef PIXEL_T
}
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