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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.
*/
//
// Hextile decoding function.
//
// This file is #included after having set the following macro:
// BPP - 8, 16 or 32
#include <rdr/InStream.h>
#include <rfb/Exception.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 READ_PIXEL CONCAT2E(readOpaque,BPP)
#define HEXTILE_DECODE CONCAT2E(hextileDecode,BPP)
static void HEXTILE_DECODE (const Rect& r, rdr::InStream* is,
const PixelFormat& pf,
ModifiablePixelBuffer* pb)
{
Rect t;
PIXEL_T bg = 0;
PIXEL_T fg = 0;
PIXEL_T buf[16 * 16];
for (t.tl.y = r.tl.y; t.tl.y < r.br.y; t.tl.y += 16) {
t.br.y = __rfbmin(r.br.y, t.tl.y + 16);
for (t.tl.x = r.tl.x; t.tl.x < r.br.x; t.tl.x += 16) {
t.br.x = __rfbmin(r.br.x, t.tl.x + 16);
int tileType = is->readU8();
if (tileType & hextileRaw) {
is->readBytes(buf, t.area() * (BPP/8));
pb->imageRect(pf, t, buf);
continue;
}
if (tileType & hextileBgSpecified)
bg = is->READ_PIXEL();
int len = t.area();
PIXEL_T* ptr = buf;
while (len-- > 0) *ptr++ = bg;
if (tileType & hextileFgSpecified)
fg = is->READ_PIXEL();
if (tileType & hextileAnySubrects) {
int nSubrects = is->readU8();
for (int i = 0; i < nSubrects; i++) {
if (tileType & hextileSubrectsColoured)
fg = is->READ_PIXEL();
int xy = is->readU8();
int wh = is->readU8();
int x = ((xy >> 4) & 15);
int y = (xy & 15);
int w = ((wh >> 4) & 15) + 1;
int h = (wh & 15) + 1;
if (x + w > 16 || y + h > 16) {
throw rfb::Exception("HEXTILE_DECODE: Hextile out of bounds");
}
PIXEL_T* ptr = buf + y * t.width() + x;
int rowAdd = t.width() - w;
while (h-- > 0) {
int len = w;
while (len-- > 0) *ptr++ = fg;
ptr += rowAdd;
}
}
}
pb->imageRect(pf, t, buf);
}
}
}
#undef PIXEL_T
#undef READ_PIXEL
#undef HEXTILE_DECODE
}
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