mirror of
https://github.com/kasmtech/KasmVNC.git
synced 2024-12-04 22:11:32 +01:00
125 lines
3.1 KiB
C++
125 lines
3.1 KiB
C++
/* 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.
|
|
*/
|
|
//
|
|
// RRE encoding function.
|
|
//
|
|
// This file is #included after having set the following macro:
|
|
// BPP - 8, 16 or 32
|
|
//
|
|
// The data argument to RRE_ENCODE contains the pixel data, and it writes the
|
|
// encoded version to the given OutStream. If the encoded version exceeds w*h
|
|
// it aborts and returns -1, otherwise it returns the number of subrectangles.
|
|
//
|
|
|
|
#include <rdr/OutStream.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
|
|
|
|
#define PIXEL_T rdr::CONCAT2E(U,BPP)
|
|
#define WRITE_PIXEL CONCAT2E(writeOpaque,BPP)
|
|
#define RRE_ENCODE CONCAT2E(rreEncode,BPP)
|
|
|
|
int RRE_ENCODE (PIXEL_T* data, int w, int h, rdr::OutStream* os, PIXEL_T bg)
|
|
{
|
|
os->WRITE_PIXEL(bg);
|
|
|
|
int nSubrects = 0;
|
|
|
|
for (int y = 0; y < h; y++)
|
|
{
|
|
int x = 0;
|
|
while (x < w) {
|
|
if (*data == bg) {
|
|
x++;
|
|
data++;
|
|
continue;
|
|
}
|
|
|
|
// Find horizontal subrect first
|
|
PIXEL_T* ptr = data+1;
|
|
PIXEL_T* eol = data+w-x;
|
|
while (ptr < eol && *ptr == *data) ptr++;
|
|
int sw = ptr - data;
|
|
|
|
ptr = data + w;
|
|
int sh = 1;
|
|
while (sh < h-y) {
|
|
eol = ptr + sw;
|
|
while (ptr < eol)
|
|
if (*ptr++ != *data) goto endOfHorizSubrect;
|
|
ptr += w - sw;
|
|
sh++;
|
|
}
|
|
endOfHorizSubrect:
|
|
|
|
// Find vertical subrect
|
|
int vh;
|
|
for (vh = sh; vh < h-y; vh++)
|
|
if (data[vh*w] != *data) break;
|
|
|
|
if (vh != sh) {
|
|
ptr = data+1;
|
|
int vw;
|
|
for (vw = 1; vw < sw; vw++) {
|
|
for (int i = 0; i < vh; i++)
|
|
if (ptr[i*w] != *data) goto endOfVertSubrect;
|
|
ptr++;
|
|
}
|
|
endOfVertSubrect:
|
|
|
|
// If vertical subrect bigger than horizontal then use that.
|
|
if (sw*sh < vw*vh) {
|
|
sw = vw;
|
|
sh = vh;
|
|
}
|
|
}
|
|
|
|
nSubrects++;
|
|
os->WRITE_PIXEL(*data);
|
|
os->writeU16(x);
|
|
os->writeU16(y);
|
|
os->writeU16(sw);
|
|
os->writeU16(sh);
|
|
|
|
ptr = data+w;
|
|
PIXEL_T* eor = data+w*sh;
|
|
while (ptr < eor) {
|
|
eol = ptr + sw;
|
|
while (ptr < eol) *ptr++ = bg;
|
|
ptr += w - sw;
|
|
}
|
|
x += sw;
|
|
data += sw;
|
|
}
|
|
}
|
|
|
|
return nSubrects;
|
|
}
|
|
|
|
#undef PIXEL_T
|
|
#undef WRITE_PIXEL
|
|
#undef RRE_ENCODE
|
|
}
|