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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2005 Constantin Kaplinsky. 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.
*/
//
// Hextile encoding function.
//
// This file is #included after having set the following macro:
// BPP - 8, 16 or 32
#include <rdr/OutStream.h>
#include <rfb/hextileConstants.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 HEXTILE_ENCODE CONCAT2E(hextileEncode,BPP)
#define HEXTILE_ENCODE_TILE CONCAT2E(hextileEncodeTile,BPP)
#define TEST_TILE_TYPE CONCAT2E(hextileTestTileType,BPP)
int TEST_TILE_TYPE (PIXEL_T* data, int w, int h, PIXEL_T* bg, PIXEL_T* fg);
int HEXTILE_ENCODE_TILE (PIXEL_T* data, int w, int h, int tileType,
rdr::U8* encoded, PIXEL_T bg);
void HEXTILE_ENCODE(rdr::OutStream* os, const PixelBuffer* pb)
{
Rect t;
PIXEL_T buf[256];
PIXEL_T oldBg = 0, oldFg = 0;
bool oldBgValid = false;
bool oldFgValid = false;
rdr::U8 encoded[256*(BPP/8)];
for (t.tl.y = 0; t.tl.y < pb->height(); t.tl.y += 16) {
t.br.y = __rfbmin(pb->height(), t.tl.y + 16);
for (t.tl.x = 0; t.tl.x < pb->width(); t.tl.x += 16) {
t.br.x = __rfbmin(pb->width(), t.tl.x + 16);
pb->getImage(buf, t);
PIXEL_T bg = 0, fg = 0;
int tileType = TEST_TILE_TYPE(buf, t.width(), t.height(), &bg, &fg);
if (!oldBgValid || oldBg != bg) {
tileType |= hextileBgSpecified;
oldBg = bg;
oldBgValid = true;
}
int encodedLen = 0;
if (tileType & hextileAnySubrects) {
if (tileType & hextileSubrectsColoured) {
oldFgValid = false;
} else {
if (!oldFgValid || oldFg != fg) {
tileType |= hextileFgSpecified;
oldFg = fg;
oldFgValid = true;
}
}
encodedLen = HEXTILE_ENCODE_TILE(buf, t.width(), t.height(), tileType,
encoded, bg);
if (encodedLen < 0) {
pb->getImage(buf, t);
os->writeU8(hextileRaw);
os->writeBytes(buf, t.width() * t.height() * (BPP/8));
oldBgValid = oldFgValid = false;
continue;
}
}
os->writeU8(tileType);
if (tileType & hextileBgSpecified) os->WRITE_PIXEL(bg);
if (tileType & hextileFgSpecified) os->WRITE_PIXEL(fg);
if (tileType & hextileAnySubrects) os->writeBytes(encoded, encodedLen);
}
}
}
int HEXTILE_ENCODE_TILE (PIXEL_T* data, int w, int h, int tileType,
rdr::U8* encoded, PIXEL_T bg)
{
rdr::U8* nSubrectsPtr = encoded;
*nSubrectsPtr = 0;
encoded++;
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 endOfSubrect;
ptr += w - sw;
sh++;
}
endOfSubrect:
(*nSubrectsPtr)++;
if (tileType & hextileSubrectsColoured) {
if (encoded - nSubrectsPtr + (BPP/8) > w*h*(BPP/8)) return -1;
#if (BPP == 8)
*encoded++ = *data;
#elif (BPP == 16)
*encoded++ = ((rdr::U8*)data)[0];
*encoded++ = ((rdr::U8*)data)[1];
#elif (BPP == 32)
*encoded++ = ((rdr::U8*)data)[0];
*encoded++ = ((rdr::U8*)data)[1];
*encoded++ = ((rdr::U8*)data)[2];
*encoded++ = ((rdr::U8*)data)[3];
#endif
}
if (encoded - nSubrectsPtr + 2 > w*h*(BPP/8)) return -1;
*encoded++ = (x << 4) | y;
*encoded++ = ((sw-1) << 4) | (sh-1);
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 encoded - nSubrectsPtr;
}
int TEST_TILE_TYPE (PIXEL_T* data, int w, int h, PIXEL_T* bg, PIXEL_T* fg)
{
PIXEL_T pix1 = *data;
PIXEL_T* end = data + w * h;
PIXEL_T* ptr = data + 1;
while (ptr < end && *ptr == pix1)
ptr++;
if (ptr == end) {
*bg = pix1;
return 0; // solid-color tile
}
int count1 = ptr - data;
int count2 = 1;
PIXEL_T pix2 = *ptr++;
int tileType = hextileAnySubrects;
for (; ptr < end; ptr++) {
if (*ptr == pix1) {
count1++;
} else if (*ptr == pix2) {
count2++;
} else {
tileType |= hextileSubrectsColoured;
break;
}
}
if (count1 >= count2) {
*bg = pix1; *fg = pix2;
} else {
*bg = pix2; *fg = pix1;
}
return tileType;
}
#undef PIXEL_T
#undef WRITE_PIXEL
#undef HEXTILE_ENCODE
#undef HEXTILE_ENCODE_TILE
#undef TEST_TILE_TYPE
}
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