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//
// Copyright (C) 2002 RealVNC Ltd. 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.
//
// zrleDecode.h - zrle decoding function.
//
// Before including this file, you must define a number of CPP macros.
//
// BPP should be 8, 16 or 32 depending on the bits per pixel.
// FILL_RECT
// IMAGE_RECT
#include <rdr/ZlibInStream.h>
#include <rdr/InStream.h>
#include <assert.h>
using namespace rdr;
/* __RFB_CONCAT2 concatenates its two arguments. __RFB_CONCAT2E does the same
but also expands its arguments if they are macros */
#ifndef __RFB_CONCAT2E
#define __RFB_CONCAT2(a,b) a##b
#define __RFB_CONCAT2E(a,b) __RFB_CONCAT2(a,b)
#endif
#ifdef CPIXEL
#define PIXEL_T __RFB_CONCAT2E(rdr::U,BPP)
#define READ_PIXEL __RFB_CONCAT2E(readOpaque,CPIXEL)
#define ZRLE_DECODE_BPP __RFB_CONCAT2E(zrleDecode,CPIXEL)
#else
#define PIXEL_T __RFB_CONCAT2E(rdr::U,BPP)
#define READ_PIXEL __RFB_CONCAT2E(readOpaque,BPP)
#define ZRLE_DECODE_BPP __RFB_CONCAT2E(zrleDecode,BPP)
#endif
void ZRLE_DECODE_BPP (int x, int y, int w, int h, rdr::InStream* is,
rdr::ZlibInStream* zis, PIXEL_T* buf)
{
int length = is->readU32();
zis->setUnderlying(is, length);
for (int ty = y; ty < y+h; ty += rfbZRLETileHeight) {
int th = rfbZRLETileHeight;
if (th > y+h-ty) th = y+h-ty;
for (int tx = x; tx < x+w; tx += rfbZRLETileWidth) {
int tw = rfbZRLETileWidth;
if (tw > x+w-tx) tw = x+w-tx;
int mode = zis->readU8();
bool rle = mode & 128;
int palSize = mode & 127;
PIXEL_T palette[128];
// fprintf(stderr,"rle %d palSize %d\n",rle,palSize);
for (int i = 0; i < palSize; i++) {
palette[i] = zis->READ_PIXEL();
}
if (palSize == 1) {
PIXEL_T pix = palette[0];
FILL_RECT(tx,ty,tw,th,pix);
continue;
}
if (!rle) {
if (palSize == 0) {
// raw
#ifdef CPIXEL
for (PIXEL_T* ptr = buf; ptr < buf+tw*th; ptr++) {
*ptr = zis->READ_PIXEL();
}
#else
zis->readBytes(buf, tw * th * (BPP / 8));
#endif
} else {
// packed pixels
int bppp = ((palSize > 16) ? 8 :
((palSize > 4) ? 4 : ((palSize > 2) ? 2 : 1)));
PIXEL_T* ptr = buf;
for (int i = 0; i < th; i++) {
PIXEL_T* eol = ptr + tw;
U8 byte = 0;
U8 nbits = 0;
while (ptr < eol) {
if (nbits == 0) {
byte = zis->readU8();
nbits = 8;
}
nbits -= bppp;
U8 index = (byte >> nbits) & ((1 << bppp) - 1) & 127;
*ptr++ = palette[index];
}
}
}
#ifdef FAVOUR_FILL_RECT
//fprintf(stderr,"copying data to screen %dx%d at %d,%d\n",tw,th,tx,ty);
IMAGE_RECT(tx,ty,tw,th,buf);
#endif
} else {
if (palSize == 0) {
// plain RLE
PIXEL_T* ptr = buf;
PIXEL_T* end = ptr + th * tw;
while (ptr < end) {
PIXEL_T pix = zis->READ_PIXEL();
int len = 1;
int b;
do {
b = zis->readU8();
len += b;
} while (b == 255);
assert(len <= end - ptr);
#ifdef FAVOUR_FILL_RECT
int i = ptr - buf;
ptr += len;
int runX = i % tw;
int runY = i / tw;
if (runX + len > tw) {
if (runX != 0) {
FILL_RECT(tx+runX, ty+runY, tw-runX, 1, pix);
len -= tw-runX;
runX = 0;
runY++;
}
if (len > tw) {
FILL_RECT(tx, ty+runY, tw, len/tw, pix);
runY += len / tw;
len = len % tw;
}
}
if (len != 0) {
FILL_RECT(tx+runX, ty+runY, len, 1, pix);
}
#else
while (len-- > 0) *ptr++ = pix;
#endif
}
} else {
// palette RLE
PIXEL_T* ptr = buf;
PIXEL_T* end = ptr + th * tw;
while (ptr < end) {
int index = zis->readU8();
int len = 1;
if (index & 128) {
int b;
do {
b = zis->readU8();
len += b;
} while (b == 255);
assert(len <= end - ptr);
}
index &= 127;
PIXEL_T pix = palette[index];
#ifdef FAVOUR_FILL_RECT
int i = ptr - buf;
ptr += len;
int runX = i % tw;
int runY = i / tw;
if (runX + len > tw) {
if (runX != 0) {
FILL_RECT(tx+runX, ty+runY, tw-runX, 1, pix);
len -= tw-runX;
runX = 0;
runY++;
}
if (len > tw) {
FILL_RECT(tx, ty+runY, tw, len/tw, pix);
runY += len / tw;
len = len % tw;
}
}
if (len != 0) {
FILL_RECT(tx+runX, ty+runY, len, 1, pix);
}
#else
while (len-- > 0) *ptr++ = pix;
#endif
}
}
}
#ifndef FAVOUR_FILL_RECT
//fprintf(stderr,"copying data to screen %dx%d at %d,%d\n",tw,th,tx,ty);
IMAGE_RECT(tx,ty,tw,th,buf);
#endif
}
}
zis->reset();
}
#undef ZRLE_DECODE_BPP
#undef READ_PIXEL
#undef PIXEL_T
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