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/* Copyright (C) 2002-2005 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.
*/
//
// ZRLE decoding function.
//
// This file is #included after having set the following macros:
// BPP - 8, 16 or 32
// EXTRA_ARGS - optional extra arguments
// FILL_RECT - fill a rectangle with a single colour
// IMAGE_RECT - draw a rectangle of pixel data from a buffer
#include <rdr/InStream.h>
#include <rdr/ZlibInStream.h>
#include <assert.h>
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
#ifdef CPIXEL
#define PIXEL_T rdr::CONCAT2E(U,BPP)
#define READ_PIXEL CONCAT2E(readOpaque,CPIXEL)
#define ZRLE_DECODE CONCAT2E(zrleDecode,CPIXEL)
#else
#define PIXEL_T rdr::CONCAT2E(U,BPP)
#define READ_PIXEL CONCAT2E(readOpaque,BPP)
#define ZRLE_DECODE CONCAT2E(zrleDecode,BPP)
#endif
void ZRLE_DECODE (const Rect& r, rdr::InStream* is,
rdr::ZlibInStream* zis, PIXEL_T* buf
#ifdef EXTRA_ARGS
, EXTRA_ARGS
#endif
)
{
int length = is->readU32();
zis->setUnderlying(is, length);
Rect t;
for (t.tl.y = r.tl.y; t.tl.y < r.br.y; t.tl.y += 64) {
t.br.y = __rfbmin(r.br.y, t.tl.y + 64);
for (t.tl.x = r.tl.x; t.tl.x < r.br.x; t.tl.x += 64) {
t.br.x = __rfbmin(r.br.x, t.tl.x + 64);
int mode = zis->readU8();
bool rle = mode & 128;
int palSize = mode & 127;
PIXEL_T palette[128];
for (int i = 0; i < palSize; i++) {
palette[i] = zis->READ_PIXEL();
}
if (palSize == 1) {
PIXEL_T pix = palette[0];
FILL_RECT(t,pix);
continue;
}
if (!rle) {
if (palSize == 0) {
// raw
#ifdef CPIXEL
for (PIXEL_T* ptr = buf; ptr < buf+t.area(); ptr++) {
*ptr = zis->READ_PIXEL();
}
#else
zis->readBytes(buf, t.area() * (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 < t.height(); i++) {
PIXEL_T* eol = ptr + t.width();
rdr::U8 byte = 0;
rdr::U8 nbits = 0;
while (ptr < eol) {
if (nbits == 0) {
byte = zis->readU8();
nbits = 8;
}
nbits -= bppp;
rdr::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",
//t.width(),t.height(),t.tl.x,t.tl.y);
IMAGE_RECT(t,buf);
#endif
} else {
if (palSize == 0) {
// plain RLE
PIXEL_T* ptr = buf;
PIXEL_T* end = ptr + t.area();
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 % t.width();
int runY = i / t.width();
if (runX + len > t.width()) {
if (runX != 0) {
FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, t.width()-runX, 1),
pix);
len -= t.width()-runX;
runX = 0;
runY++;
}
if (len > t.width()) {
FILL_RECT(Rect(t.tl.x, t.tl.y+runY, t.width(), len/t.width()),
pix);
runY += len / t.width();
len = len % t.width();
}
}
if (len != 0) {
FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, len, 1), pix);
}
#else
while (len-- > 0) *ptr++ = pix;
#endif
}
} else {
// palette RLE
PIXEL_T* ptr = buf;
PIXEL_T* end = ptr + t.area();
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 % t.width();
int runY = i / t.width();
if (runX + len > t.width()) {
if (runX != 0) {
FILL_RECT(Rect(t.tl.x+runX, t.tl.y+runY, t.width()-runX, 1),
pix);
len -= t.width()-runX;
runX = 0;
runY++;
}
if (len > t.width()) {
FILL_RECT(Rect(t.tl.x, t.tl.y+runY, t.width(), len/t.width()),
pix);
runY += len / t.width();
len = len % t.width();
}
}
if (len != 0) {
FILL_RECT(Rect(t.tl.x+runX, t.tl.y+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",
//t.width(),t.height(),t.tl.x,t.tl.y);
IMAGE_RECT(t,buf);
#endif
}
}
zis->reset();
}
#undef ZRLE_DECODE
#undef READ_PIXEL
#undef PIXEL_T
}
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