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Risc World 3
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ISSUE2
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PD
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VINCE
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!ViNCe
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c
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hextile16
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2002-03-10
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/*
* Copyright (C) 1999 AT&T Laboratories Cambridge. 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.c - handle hextile encoding.
*
* This file shouldn't be compiled directly. It is included multiple times by
* rfbproto.c, each time with a different definition of the macro BPP. For
* each value of BPP, this file defines a function which handles a hextile
* encoded rectangle with BPP bits per pixel.
*/
static bppinfo[4096];
static Bool HandleHextile16 (int rx, int ry, int rw, int rh)
{
CARD16 bg, fg;
int i;
CARD8 *ptr;
int x, y, w, h;
int sx, sy, sw, sh;
CARD8 subencoding;
CARD8 nSubrects;
for (y = ry; y < ry+rh; y += 16) {
for (x = rx; x < rx+rw; x += 16) {
w = h = 16;
if (rx+rw - x < 16)
w = rx+rw - x;
if (ry+rh - y < 16)
h = ry+rh - y;
if (!ReadFromRFBServer((char *)&subencoding, 1))
return False;
if (subencoding & rfbHextileRaw) {
int dithered;
dithered = 0;
if (subencoding & rfbHextileRawDither) {
dithered = 1;
}
if (dithered) {
if (!ReadFromRFBServer(buffer, w * h))
return False;
display_raw(x, y, w, h, buffer, 1);
} else {
if (!ReadFromRFBServer(buffer, w * h * (BPP / 8)))
return False;
display_raw(x, y, w, h, buffer, 0);
}
continue;
}
if (subencoding & rfbHextileBackgroundSpecified) {
if (!ReadFromRFBServer((char *)&bg, sizeof(bg)))
return False;
}
display_fillrectangle(x, y, w, h, bg);
if (subencoding & rfbHextileForegroundSpecified) {
if (!ReadFromRFBServer((char *)&fg, sizeof(fg)))
return False;
}
if (!(subencoding & rfbHextileAnySubrects)) {
continue;
}
if (!ReadFromRFBServer((char *)&nSubrects, 1))
return False;
ptr = (CARD8 *)buffer;
if (subencoding & rfbHextileSubrectsColoured) {
if (!ReadFromRFBServer(buffer, nSubrects * (2 + (BPP / 8))))
return False;
subrect += nSubrects;
for (i = 0; i < nSubrects; i++) {
fg = ptr[0] | (ptr[1]<<8);
ptr += 2;
sx = rfbHextileExtractX(*ptr);
sy = rfbHextileExtractY(*ptr);
ptr++;
sw = rfbHextileExtractW(*ptr);
sh = rfbHextileExtractH(*ptr);
ptr++;
display_fillrectangle(x+sx, y+sy, sw, sh, fg);
}
} else {
if (!ReadFromRFBServer(buffer, nSubrects * 2))
return False;
subrect += nSubrects;
for (i = 0; i < nSubrects; i++) {
sx = rfbHextileExtractX(*ptr);
sy = rfbHextileExtractY(*ptr);
ptr++;
sw = rfbHextileExtractW(*ptr);
sh = rfbHextileExtractH(*ptr);
ptr++;
display_fillrectangle(x+sx, y+sy, sw, sh, fg);
}
}
}
}
return True;
}